WEBVTT 1 00:00:03.399 --> 00:00:07.719 Welcome to Bedtime Astronomy. Explore the wonders of the cosmos 2 00:00:07.759 --> 00:00:12.279 with our soothing Bedtime Astronomy podcast. Each episode offers a 3 00:00:12.359 --> 00:00:16.320 gentle journey through the stars, planets, and beyond, perfect for 4 00:00:16.399 --> 00:00:20.239 unwinding after a long day. Let's travel through the mysteries 5 00:00:20.239 --> 00:00:22.440 of the universe as you drift off into a peaceful 6 00:00:22.480 --> 00:00:23.800 slumber under the night sky. 7 00:00:27.039 --> 00:00:29.719 For well, for the better part of a century. Really, 8 00:00:30.039 --> 00:00:32.679 when astronomers look out at the universe, they've been working 9 00:00:32.719 --> 00:00:35.920 with a kind of standard cosmic blueprint. 10 00:00:35.439 --> 00:00:38.759 Mm hm, the LAMB, the CDM model, Yeah, exactly. 11 00:00:38.759 --> 00:00:41.079 And if you followed cosmology at all, you know this 12 00:00:41.159 --> 00:00:44.640 blueprint is well, it's deeply unsettling. 13 00:00:44.719 --> 00:00:46.320 It is a bit strange, yeah, because. 14 00:00:46.039 --> 00:00:50.240 It says that everything we see, you know, the stars, planets, gas, 15 00:00:50.280 --> 00:00:53.159 the stuff we interact with normal matter. Right, normal matter 16 00:00:53.520 --> 00:00:55.960 makes up less than five percent of everything that's out there. 17 00:00:56.000 --> 00:01:00.079 That's the picture. Yes, the huge majority, like ninety of 18 00:01:00.159 --> 00:01:05.280 the universe is completely theoretical. It's unseen, undetectable directly anyway. 19 00:01:05.400 --> 00:01:07.200 And then ninety percent is split. 20 00:01:07.120 --> 00:01:11.519 Correct between cold dark matter or CDM, which acts like 21 00:01:11.599 --> 00:01:13.120 extra gravitational. 22 00:01:12.560 --> 00:01:14.519 Scaffolding holding galaxies together. 23 00:01:14.599 --> 00:01:15.640 Holding structures together. 24 00:01:15.760 --> 00:01:16.079 Yes. 25 00:01:16.400 --> 00:01:19.760 And then there's Lambda, the Greek letter Lambda that represents 26 00:01:19.879 --> 00:01:20.840 dark energy. 27 00:01:20.680 --> 00:01:24.480 The mysterious push making the universe expand faster and faster. 28 00:01:24.920 --> 00:01:31.239 That's the one. It's this repulsive force driving acceleration the model. Mathematically, 29 00:01:31.280 --> 00:01:35.159 it actually works incredibly well for describing observations. But yeah, 30 00:01:35.159 --> 00:01:37.719 the big butt is that it requires us to accept 31 00:01:38.159 --> 00:01:41.719 that reality is fundamentally dominated by these two components that 32 00:01:41.760 --> 00:01:43.959 we just cannot find. We haven't detected them. 33 00:01:43.799 --> 00:01:47.519 Directly, and that huge puzzle is what we're diving into today. 34 00:01:48.000 --> 00:01:51.280 We're exploring a really radical new hypothesis. 35 00:01:51.280 --> 00:01:51.959 Truly radical. 36 00:01:52.040 --> 00:01:55.879 Yes, it suggests this entire dark sector, this, you know, 37 00:01:56.000 --> 00:01:59.000 ninety five percent needed to make the standard model work. 38 00:01:59.719 --> 00:02:02.799 Maybe it doesn't actually exist as substances anyway, right, Maybe 39 00:02:02.840 --> 00:02:06.319 it's just a cosmic illusion. We're looking at the work 40 00:02:06.359 --> 00:02:09.240 of Professor Rajendra Gupta from the University of Ottawa and. 41 00:02:09.199 --> 00:02:11.400 He's really challenging the foundations here totally. 42 00:02:11.439 --> 00:02:14.439 He's questioning the whole structure of modern cosmology. 43 00:02:14.719 --> 00:02:17.919 His core idea, and it's a big one, is that 44 00:02:18.479 --> 00:02:22.719 what we interpret as dark matter and dark energy, they 45 00:02:22.759 --> 00:02:26.919 aren't mysterious particles or fields Instead, they're just the effects 46 00:02:27.000 --> 00:02:31.680 we observe because the basic strengths of nature's forces think gravity, 47 00:02:31.719 --> 00:02:39.240 electromagnetism are actually slowly weakening over cosmic time, weakening and 48 00:02:39.360 --> 00:02:42.319 varying and varying subtly as the universe expands and ages. 49 00:02:42.680 --> 00:02:46.000 This is huge because physics has always, i mean always 50 00:02:46.039 --> 00:02:49.919 assumed these fundamental constants are just that constant, immutable. 51 00:02:50.039 --> 00:02:52.879 Wow. So okay, this isn't just tweaking an equation or 52 00:02:52.879 --> 00:02:54.039 looking for a new particle. 53 00:02:54.080 --> 00:02:55.639 Well no, no, far beyond that. 54 00:02:56.159 --> 00:02:59.159 This is proposing that the actual rules of the physical 55 00:02:59.240 --> 00:03:02.080 universe might be a changing over billions of years. 56 00:03:02.240 --> 00:03:03.080 That's the proposition. 57 00:03:03.199 --> 00:03:05.039 Before we get deeper into how this works, let's just 58 00:03:05.080 --> 00:03:08.280 clarify the names you mentioned Lambda CDM as the standard. 59 00:03:08.520 --> 00:03:11.520 What's the alternative framework GOOPED is putting forward. 60 00:03:11.240 --> 00:03:15.199 Called right, the new model is called CCC plus TL cosmology. 61 00:03:15.199 --> 00:03:16.159 It's quite a mouthful, I. 62 00:03:16.120 --> 00:03:20.400 Know, CCC plus TL. Okay, let's break that down. What 63 00:03:20.439 --> 00:03:21.479 do those letters stand for? 64 00:03:21.560 --> 00:03:26.599 Absolutely, it's technical, but crucial. CCC stands for coverying coupling constants. 65 00:03:26.719 --> 00:03:28.360 Coverying coupling constant. 66 00:03:28.479 --> 00:03:31.319 That's the key mechanism. It means the fundamental constants like 67 00:03:31.360 --> 00:03:34.199 G the gravitational constant, or see the speed of light, 68 00:03:34.599 --> 00:03:38.120 aren't fixed numbers. They change slowly. They co vary as 69 00:03:38.159 --> 00:03:39.120 the universe gets older. 70 00:03:39.360 --> 00:03:43.879 So if gravity was, say, slightly stronger billions of years 71 00:03:43.879 --> 00:03:45.120 ago than it is now. 72 00:03:44.960 --> 00:03:48.080 Exactly that changes everything. How we interpret distances, how we 73 00:03:48.120 --> 00:03:50.599 measure cosmic time. All of it gets recalibrated. 74 00:03:50.639 --> 00:03:52.919 Okay, that's the CCC part. What about the TL. 75 00:03:53.120 --> 00:03:55.599 The TL stands for tired light. Tired light. 76 00:03:56.439 --> 00:03:58.919 That sounds familiar. Isn't that an older idea that was 77 00:03:58.960 --> 00:03:59.919 mostly discarded? 78 00:04:00.159 --> 00:04:02.599 It is, but this is a modified version integrated with 79 00:04:02.639 --> 00:04:06.199 the CCC part. The basic tired light idea was that 80 00:04:06.319 --> 00:04:10.960 light loses energy just by traveling vast cosmic distances. 81 00:04:10.520 --> 00:04:12.680 Making it look redder, red shifted. 82 00:04:12.400 --> 00:04:16.519 Precisely in this CCC plus TL model, the red shift 83 00:04:16.560 --> 00:04:19.439 we see from distant galaxies isn't only because space itself 84 00:04:19.480 --> 00:04:21.240 is stretching, which is the standard view. 85 00:04:21.199 --> 00:04:22.399 Right the expansion of space. 86 00:04:22.600 --> 00:04:25.759 Instead, it's partly due to this intrinsic energy loss plus 87 00:04:25.839 --> 00:04:29.600 the effects of the covering constants. It's combined effect. Gooptet 88 00:04:29.759 --> 00:04:33.480 uses this combination to fundamentally reset our cosmic measuring tape. 89 00:04:33.600 --> 00:04:36.399 Okay, I see. So if the constants aren't constant and 90 00:04:36.480 --> 00:04:40.879 redshift isn't purely expansion, then our whole map of the universe, 91 00:04:40.920 --> 00:04:43.319 its size, it's history, it all has to be. 92 00:04:43.279 --> 00:04:45.279 Reevaluated, completely reevaluated. 93 00:04:45.319 --> 00:04:47.879 So let's get into the core claim. Then, if these 94 00:04:47.920 --> 00:04:50.879 forces are changing, how on Earth does that explain both 95 00:04:50.920 --> 00:04:53.920 the accelerating expansion of the universe and the weird way 96 00:04:54.000 --> 00:04:58.040 galaxies rotate. These seem like totally different problems on vastly 97 00:04:58.079 --> 00:04:59.360 different scales. 98 00:04:58.920 --> 00:05:01.040 And that is the central sho with land to CDM, 99 00:05:01.120 --> 00:05:04.040 isn't it, And it's precisely the main attraction of the 100 00:05:04.040 --> 00:05:09.360 CCC plus tl IDEA. Standard cosmology needs those dark components 101 00:05:09.399 --> 00:05:13.000 because we have these two distinct sets of observations. 102 00:05:12.439 --> 00:05:14.680 One huge one relatively small. 103 00:05:14.480 --> 00:05:17.720 Exactly observations on completely different scales that just don't fit 104 00:05:17.800 --> 00:05:20.560 if you only use the visible matter we see. And crucially, 105 00:05:20.639 --> 00:05:24.000 land to CDM needs two totally different fixes conceptually and 106 00:05:24.000 --> 00:05:25.480 mathematically for these two problems. 107 00:05:25.519 --> 00:05:28.160 All right, let's tackle the big one first, dark energy. 108 00:05:28.319 --> 00:05:31.199 This operates on the cosmological scale right looking at the 109 00:05:31.279 --> 00:05:33.560 universe as a whole, where things are assumed to be 110 00:05:33.959 --> 00:05:35.959 sort of uniform. 111 00:05:36.040 --> 00:05:40.480 Precisely, we're talking scales larger than say, six hundred million 112 00:05:40.519 --> 00:05:45.920 light years across. On that scale, the universe looks statistically homogeneous, 113 00:05:46.879 --> 00:05:49.839 basically the same everywhere, smooth, uniform. 114 00:05:49.639 --> 00:05:52.040 And the standard model observation there is that. 115 00:05:52.040 --> 00:05:54.920 The expansion of the universe isn't just happening, it's speeding up. 116 00:05:55.439 --> 00:05:58.160 It's accelerating, which is weird, like throwing a ball up 117 00:05:58.199 --> 00:06:00.639 and having it go faster and faster instead of slowing down. 118 00:06:00.959 --> 00:06:05.000 That's the analogy. Yes, it defies gravitational intuition. Yeah, So 119 00:06:05.399 --> 00:06:10.720 to explain this, standard cosmology introduces dark energy lamba. It's 120 00:06:10.759 --> 00:06:14.800 effectively an unknown repulsive force, maybe an energy inherent to 121 00:06:14.800 --> 00:06:16.720 empty space itself, pushing everything apart. 122 00:06:16.879 --> 00:06:19.399 It's basically a fudge factor. Then something added to the 123 00:06:19.439 --> 00:06:22.120 equations to make them match the observation of acceleration. 124 00:06:22.279 --> 00:06:25.319 Well, it's a parameter added Einstein's equations that acts like 125 00:06:25.360 --> 00:06:27.959 a repulsive force. Whether it's a fudge factor or a 126 00:06:28.040 --> 00:06:31.240 real physical entity is the big debate. But yes, it's 127 00:06:31.240 --> 00:06:33.319 put there specifically to explain the acceleration. 128 00:06:33.680 --> 00:06:38.399 Okay, so that's the standard view. A mysterious push across 129 00:06:38.439 --> 00:06:43.439 the vast uniform cosmos. How does Gukta's model with just 130 00:06:43.560 --> 00:06:47.519 weakening forces achieve the same effect, no push needed. 131 00:06:47.720 --> 00:06:52.079 It's a very neat substitution. Actually, if the universe's fundamental 132 00:06:52.120 --> 00:06:55.959 forces like gravity or weakening, on average uniformly across these 133 00:06:56.079 --> 00:06:59.680 vast scales as the universe expands, think about it. The 134 00:07:00.399 --> 00:07:03.920 gravitational pull that's trying to hold the universe together is 135 00:07:03.959 --> 00:07:05.680 getting weaker over time, like a. 136 00:07:05.639 --> 00:07:07.959 Stretched rubber band that's slowly dissolving. 137 00:07:08.000 --> 00:07:11.680 Good analogy. The effect of this diminishing pole looks exactly 138 00:07:11.720 --> 00:07:15.279 like the effect of some external repulsive push. The universe 139 00:07:15.279 --> 00:07:18.240 appears to accelerate outwards, not because there's a stronger engine 140 00:07:18.240 --> 00:07:20.800 pushing it dark energy, but because the brake's holding it 141 00:07:20.879 --> 00:07:22.279 back gravity are getting weaker. 142 00:07:22.360 --> 00:07:24.519 Huh. That's clever if f lips the cause and effect. 143 00:07:24.600 --> 00:07:27.519 So the big scale expansion problem is potentially solved by 144 00:07:27.560 --> 00:07:30.040 this global weakening of forces over time. 145 00:07:30.160 --> 00:07:32.000 That's the proposal for the cosmological scale. 146 00:07:32.040 --> 00:07:34.319 Yes, so now we have to zoom way way in 147 00:07:34.759 --> 00:07:37.399 down to the scale of individual galaxies and clusters. The 148 00:07:37.480 --> 00:07:40.879 astrophysical scale, This is where dark matter is supposed to live. 149 00:07:41.120 --> 00:07:45.600 We shift scales completely now we're talking about gravitationally bound systems, galaxies, 150 00:07:45.639 --> 00:07:48.319 galaxy groups. The universe here is not uniform at all. 151 00:07:48.360 --> 00:07:51.800 It's incredibly lumpy. Matter distribution is everything. 152 00:07:51.959 --> 00:07:55.800 And the classic dark matter problem arises from how galaxies rotate. Right, 153 00:07:55.879 --> 00:07:58.920 stars on the outskirts are moving way too fast. 154 00:07:58.680 --> 00:08:00.639 Way too fast. If you just can't up the mass 155 00:08:00.639 --> 00:08:03.399 of the stars gas and dust. You can see there 156 00:08:03.439 --> 00:08:06.000 isn't nearly enough gravity to hold onto those outer stars. 157 00:08:06.279 --> 00:08:09.199 They should just fly off into intergalactic space. Based on 158 00:08:09.680 --> 00:08:12.680 Newtonian physics or general relativity alone, so. 159 00:08:12.720 --> 00:08:13.720 The standard fix. 160 00:08:13.839 --> 00:08:17.000 The standard fix is to embed the visible galaxy within 161 00:08:17.040 --> 00:08:20.319 a huge invisible sphere, a halo made of cold dark 162 00:08:20.360 --> 00:08:24.839 matter CDM. This invisible mass provides the extra gravitational pull 163 00:08:24.920 --> 00:08:28.000 needed to keep the outer stars orbiting quickly, matching. 164 00:08:27.720 --> 00:08:31.560 Observations creating those flat rotation curves we observe exactly. 165 00:08:32.000 --> 00:08:34.639 But it requires inventing a new type of matter, maybe 166 00:08:34.639 --> 00:08:38.080 a wimp, a weakly interacting massive particle, something that has 167 00:08:38.120 --> 00:08:41.320 mass and gravity but doesn't interact with light, hence dark. 168 00:08:41.399 --> 00:08:45.919 Okay, now the big question, how does the CCC plus 169 00:08:45.960 --> 00:08:50.759 TL model with just its varying constants generate that same 170 00:08:50.759 --> 00:08:55.080 effect that extra gravity at the local galactic scale without 171 00:08:55.120 --> 00:08:57.080 needing any invisible matter halo. 172 00:08:57.600 --> 00:09:01.559 Right here, the mechanism changes focuses. It's not about the 173 00:09:01.600 --> 00:09:05.799 average weakening of forces over cosmic time anymore, which explained 174 00:09:05.799 --> 00:09:08.919 the dark energy effect. Okay, now, it's about the spatial 175 00:09:09.000 --> 00:09:12.159 variation of the forces within and around these lumpy structures 176 00:09:12.240 --> 00:09:12.960 like galaxies. 177 00:09:13.159 --> 00:09:16.320 Spatial variation, so the strength of gravity changes from place 178 00:09:16.320 --> 00:09:17.639 to place within a galaxy. 179 00:09:17.679 --> 00:09:20.759 In effect, yes, at the smaller lumpy scale, the very 180 00:09:20.799 --> 00:09:24.559 presence and distribution of normal matter, the stars, the gas, 181 00:09:24.600 --> 00:09:28.440 the central black hole causes the fundamental coupling constants themselves 182 00:09:28.480 --> 00:09:29.960 to vary locally. 183 00:09:29.519 --> 00:09:32.399 Spatially, So the constants aren't just changing smoothly over billions 184 00:09:32.440 --> 00:09:35.440 of years, they're also fluctuating depending on what matter is nearby. 185 00:09:35.639 --> 00:09:39.080 That's the idea, and this localized spatial variation in the 186 00:09:39.120 --> 00:09:42.919 constant generates an effect that modifies gravity, providing the extra 187 00:09:43.000 --> 00:09:44.840 pull that we currently attribute to dark matter. 188 00:09:45.000 --> 00:09:46.639 Hold on, I need to make sure I've got this straight. 189 00:09:46.679 --> 00:09:50.679 And for everyone listening. On the huge cosmic scale, the 190 00:09:50.720 --> 00:09:55.200 forces weaken uniformly over time, mimicking dark energy. 191 00:09:55.039 --> 00:09:57.279 Correct like a global average trend. 192 00:09:57.039 --> 00:10:00.399 But zoom into a lumpy galaxy and the forces vary 193 00:10:00.440 --> 00:10:04.720 in space reacting to the clumps of normal matter mimicking 194 00:10:04.840 --> 00:10:05.440 dark matter. 195 00:10:05.759 --> 00:10:10.080 That's the crucial distinction. The effect arises from the let's 196 00:10:10.080 --> 00:10:14.679 call them gravitational field modifications generated by these spatial fluctuations 197 00:10:14.720 --> 00:10:17.279 of the constants around dense objects. 198 00:10:17.399 --> 00:10:20.159 This is where it gets really interesting and potentially very powerful, 199 00:10:20.240 --> 00:10:24.159 because in the standard lambda CDM model, you need two 200 00:10:24.200 --> 00:10:26.440 completely different mathematical. 201 00:10:25.840 --> 00:10:29.480 Tools, right, absolutely different. You use cosmological fluid equations and 202 00:10:29.519 --> 00:10:33.519 the Freedman equations to handle lambda dark energy on large scales, 203 00:10:33.559 --> 00:10:36.519 and for dark matter, for dark matter halos and structure formation, 204 00:10:36.799 --> 00:10:41.080 you need complex end body simulations tracking millions of hypothetical 205 00:10:41.159 --> 00:10:46.120 dark matter particles interacting gravitationally. Totally separate physics, separate simulations. 206 00:10:46.159 --> 00:10:48.960 But Gupta's CCC plus TL approach. 207 00:10:48.879 --> 00:10:52.600 Claims to explain both the cosmic acceleration and the galactic 208 00:10:52.639 --> 00:10:56.879 quotation curves using the same underlying physical principle and the 209 00:10:56.879 --> 00:11:00.960 same core equation. Wow, the unity comes from a single idea. 210 00:11:01.759 --> 00:11:05.080 The effects we observe are just emergent properties of fundamental 211 00:11:05.080 --> 00:11:09.000 constants varying with cosmic age and local density. You don't 212 00:11:09.000 --> 00:11:12.559 need to add two separate mysterious ingredients to the cosmic soup. 213 00:11:12.720 --> 00:11:16.720 So instead of inventing a particle CDM and a field lambda, 214 00:11:16.840 --> 00:11:19.919 Goopta says, it's all down to one principle. The rules 215 00:11:19.919 --> 00:11:21.200 of physics aren't fixed. 216 00:11:21.279 --> 00:11:22.000 They're dynamic. 217 00:11:22.120 --> 00:11:24.759 That has a certain elegance to it, doesn't it. It 218 00:11:24.840 --> 00:11:28.559 simplifies things massively conceptually, at least, it changes the question 219 00:11:28.639 --> 00:11:31.919 from what new stuff is out there to how constant 220 00:11:31.919 --> 00:11:33.840 are the rules we thought we knew precisely? 221 00:11:33.960 --> 00:11:37.000 And that kind of theoretical economy is very appealing in physics. 222 00:11:37.399 --> 00:11:40.200 If a theory can unify disparate phenomena with a single 223 00:11:40.360 --> 00:11:43.720 underlying mechanism, it gains a lot of attention. It suggests 224 00:11:44.039 --> 00:11:47.480 maybe ninety five percent of the universe's observed behavior isn't 225 00:11:47.519 --> 00:11:50.399 due to unknown components, but arises from the dynamics of 226 00:11:50.399 --> 00:11:52.399 the five percent we can see and its interaction with 227 00:11:52.440 --> 00:11:53.279 evolving laws. 228 00:11:53.639 --> 00:11:56.440 Okay, let's dig into that mechanism a bit more, especially 229 00:11:56.440 --> 00:12:00.399 for the galaxies, because explaining those rotation terms without dark 230 00:12:00.440 --> 00:12:04.679 matter is notoriously difficult for modified gravity theories. How does 231 00:12:04.759 --> 00:12:10.840 this variation of constants actually create this this gravitational impostor. 232 00:12:11.279 --> 00:12:15.120 This involves a key mathematical parameter that emerges from the theory, 233 00:12:15.440 --> 00:12:18.320 usually denoted by the Greek letter alpha qulpha. 234 00:12:18.399 --> 00:12:20.960 Okay, is alpha a particle a field. 235 00:12:20.879 --> 00:12:24.360 Neither think of belbi as a mathematical term, a parameter 236 00:12:24.679 --> 00:12:27.440 that represents the effect of the evolving constants within the 237 00:12:27.440 --> 00:12:31.480 gravitational field equations when you allow the coupling constants to 238 00:12:31.559 --> 00:12:34.639 change over time in varying space. According to the CCC 239 00:12:34.759 --> 00:12:38.240 plus TL framework, this alpha term naturally appears in the math. 240 00:12:38.399 --> 00:12:41.600 So alpha quantifies the gravitational effect of the changing forces. 241 00:12:41.679 --> 00:12:43.799 You can put it that way. Yes, it quantifies the 242 00:12:43.840 --> 00:12:47.639 modification to standard gravity caused by the varying constants. 243 00:12:47.879 --> 00:12:50.440 And how does this mathematical term manage to do the 244 00:12:50.559 --> 00:12:53.600 job of a massive halo of invisible matter? How does 245 00:12:53.639 --> 00:12:54.919 it provide that extra pull? 246 00:12:55.279 --> 00:12:59.919 Effectively? Alpha inserts itself into the gravitational equations. It acts. 247 00:13:00.000 --> 00:13:02.759 It's like an extra term that modifies the strength of gravity. 248 00:13:03.000 --> 00:13:05.960 But crucially, its strength depends on the local conditions. 249 00:13:06.080 --> 00:13:08.600 Ah. Okay, so it's not a uniform effect. 250 00:13:08.399 --> 00:13:10.519 Not at all on the local scale. This alpha term 251 00:13:10.559 --> 00:13:14.360 provides the needed extra gravitational influence. To explain both the 252 00:13:14.399 --> 00:13:18.200 flat rotation curves and galaxies, and when treated differently on 253 00:13:18.279 --> 00:13:21.039 large scales, the cosmic acceleration. 254 00:13:21.000 --> 00:13:23.679 The key must be how alpha behaves differently depending on 255 00:13:23.720 --> 00:13:27.000 the scale. Right, A standard dark matter halo is usually 256 00:13:27.000 --> 00:13:31.279 pictured as this big, smooth, relatively static blob of stuff. 257 00:13:31.639 --> 00:13:35.840 Right. CDM halos are generally modeled as smooth distributions largely 258 00:13:35.879 --> 00:13:37.759 independent of the visible matter within them. 259 00:13:38.320 --> 00:13:42.000 But if alpha comes from evolving constants interacting with normal matter, 260 00:13:42.360 --> 00:13:44.639 its effect must be tied directly to where the normal 261 00:13:44.639 --> 00:13:45.960 matter is exactly. 262 00:13:46.120 --> 00:13:50.039 That's the critical difference. Alpha's is dynamic and highly scale dependent. 263 00:13:50.399 --> 00:13:52.799 On the huge cosmological scales where we dealt with the 264 00:13:52.879 --> 00:13:57.000 dark energy problem, we can approximate the universe's uniform so 265 00:13:57.159 --> 00:14:00.240 alpha is treated essentially as a simple constant value. 266 00:14:00.200 --> 00:14:03.639 There determined by fitting data like from supernovae. 267 00:14:03.639 --> 00:14:06.840 Correct assuming homogeneighty, lets us treat it as a single 268 00:14:06.919 --> 00:14:09.600 number for the whole universe at a given cosmic time. 269 00:14:09.799 --> 00:14:14.279 Then you zoom into one specific galaxy. You've got stars, gas, 270 00:14:14.559 --> 00:14:18.679 a black hole. Maybe the matter distribution is incredibly clumpy, 271 00:14:18.799 --> 00:14:19.840 not uniform. 272 00:14:19.440 --> 00:14:22.440 At all, extremely non uniform and that's where alpha gets 273 00:14:22.440 --> 00:14:27.279 interesting locally. At this astrophysical scale, Alpha itself varies significantly 274 00:14:27.279 --> 00:14:31.759 in space. Why because its value, its strength arises from 275 00:14:31.799 --> 00:14:35.480 the interplay between the evolving constants and the local concentration 276 00:14:35.559 --> 00:14:39.200 of standard matter. So the gravitational modification generated by alpha 277 00:14:39.360 --> 00:14:42.279 depends heavily on how much normal stuff is nearby and 278 00:14:42.279 --> 00:14:43.080 how it's ranged. 279 00:14:43.399 --> 00:14:46.759 So alpha isn't some independent halo. Its effect is directly 280 00:14:46.799 --> 00:14:48.200 coupled to the visible matter. 281 00:14:48.360 --> 00:14:51.639 Precisely, it's not an added substance. It's a modification of 282 00:14:51.679 --> 00:14:55.000 gravity induced by the normal matter within the context of 283 00:14:55.000 --> 00:14:56.000 evolving constants. 284 00:14:56.279 --> 00:14:58.120 Okay, and this leads to what sounds like a really 285 00:14:58.159 --> 00:15:02.399 counterintuitive prediction, something about an inverse relationship with density. Can 286 00:15:02.440 --> 00:15:05.600 you explain that again, Because normally more mass means more gravity, 287 00:15:05.679 --> 00:15:06.200 simple as. 288 00:15:06.120 --> 00:15:08.559 That, Right, This requires a bit of a mental shift. 289 00:15:08.600 --> 00:15:12.240 We're not adding extra mass here, we're modifying the gravitational 290 00:15:12.240 --> 00:15:17.399 field itself. The theory predicts this inverse relationship in regions 291 00:15:17.399 --> 00:15:21.399 where you have a very high density of normal visible matter, 292 00:15:21.519 --> 00:15:22.720 like the dense inner core. 293 00:15:22.559 --> 00:15:25.279 Of a galaxy, where gravity from stars and gas is 294 00:15:25.320 --> 00:15:26.399 already really strong. 295 00:15:26.639 --> 00:15:30.279 Exactly in those regions, the additional gravitational effect caused by 296 00:15:30.320 --> 00:15:34.600 this alpha mechanism is actually less significant relative to the 297 00:15:34.759 --> 00:15:37.120 already powerful gravity from the normal matter. 298 00:15:37.320 --> 00:15:38.919 Okay, And the flip side. 299 00:15:38.679 --> 00:15:41.399 Conversely, out in the regions where the density of detectable 300 00:15:41.919 --> 00:15:45.240 standard matter is very low, like the faint outer edges 301 00:15:45.240 --> 00:15:47.159 of a spiral galaxy, far from. 302 00:15:47.000 --> 00:15:49.840 The core, where normal gravity should be getting much weaker. 303 00:15:50.039 --> 00:15:54.200 Yes, where Newtonian gravity is dropping off rapidly. In those regions, 304 00:15:54.240 --> 00:15:58.159 the extra gravitational effect generated by alpha becomes larger, more dominant. 305 00:15:58.159 --> 00:16:01.399 Wait, that sounds backwards. Why would the extra gravity effect 306 00:16:01.399 --> 00:16:04.279 be weaker where normal gravity is strong, and stronger where 307 00:16:04.320 --> 00:16:05.480 normal gravity is weak. 308 00:16:05.720 --> 00:16:09.080 Think of it like this. Maybe in the dense galactic center, 309 00:16:09.600 --> 00:16:12.279 the gravitational field is already so intense due to all 310 00:16:12.320 --> 00:16:15.360 the stars and gas that the modification effect from the 311 00:16:15.440 --> 00:16:20.320 varying constants is somehow saturated or maybe just less noticeable 312 00:16:20.639 --> 00:16:23.600 compared to the immense gravity already there. It's like trying 313 00:16:23.639 --> 00:16:25.480 to make a small ripple in a storm tossed c 314 00:16:26.240 --> 00:16:29.639 The effect is negligible, okay, But as you move outwards, 315 00:16:29.960 --> 00:16:33.360 the gravity from the visible matter falls off dramatically. Remember 316 00:16:33.399 --> 00:16:36.200 the inverse square law it gets weak very quickly. At 317 00:16:36.200 --> 00:16:40.600 that point, the modification effect, this gravitational imposter alpha generated 318 00:16:40.600 --> 00:16:43.279 by the local spatial variation of the constants in that 319 00:16:43.320 --> 00:16:46.639 low density environment, that becomes the main player influencing the 320 00:16:46.720 --> 00:16:51.600 orbits of the outer stars. Its relative contribution becomes much larger. 321 00:16:51.519 --> 00:16:55.240 So the modification effect kicks in most strongly, precisely where 322 00:16:55.279 --> 00:16:58.720 standard gravity predicts things should be slowing down, but they aren't. 323 00:16:58.840 --> 00:17:02.039 That's the claim. It's not about adding mass, It's about 324 00:17:02.039 --> 00:17:05.559 the geometry of the gravitational field itself being altered, and 325 00:17:05.599 --> 00:17:09.400 that alteration is most pronounced where the gravity from normal matter. 326 00:17:09.240 --> 00:17:12.799 Is weakest, and that altered field provides the extra pole 327 00:17:12.880 --> 00:17:16.039 needed to keep those outer stars moving fast. Explaining the 328 00:17:16.079 --> 00:17:18.000 flat rotation curves exactly. 329 00:17:18.400 --> 00:17:22.279 It generates the required extra force without invoking any new 330 00:17:22.440 --> 00:17:26.440 exotic dark matter particles or halos. It's presented as a 331 00:17:26.559 --> 00:17:30.799 unified fix using just the dynamics of known forces and constants. 332 00:17:31.440 --> 00:17:34.599 It really all comes down to accepting that foundational premise 333 00:17:35.119 --> 00:17:39.359 that the constants of nature aren't truly constant over cosmic time. 334 00:17:39.480 --> 00:17:42.039 That's the lynchpin, and if you accept that, wow, the 335 00:17:42.039 --> 00:17:45.079 implications just ripple outwards. It doesn't just change what the 336 00:17:45.160 --> 00:17:47.319 universe is made of. It changes how old it is, 337 00:17:47.440 --> 00:17:49.960 maybe even where we should be looking for answers. 338 00:17:50.079 --> 00:17:53.920 Absolutely, and one of the first major implications addresses a 339 00:17:53.960 --> 00:17:57.559 real headache in standard cosmology, something that's become even more 340 00:17:57.599 --> 00:17:59.200 apparent with recent observations. 341 00:17:59.319 --> 00:18:00.759 You mean the age puzzle, the age. 342 00:18:00.640 --> 00:18:04.279 Puzzle exactly where it's sometimes called the impossible early galaxies problem. 343 00:18:04.400 --> 00:18:06.960 Right, This is about telescopes like James Webb finding these 344 00:18:07.000 --> 00:18:12.480 incredibly massive, well formed galaxies surprisingly early in the universe's history. 345 00:18:12.559 --> 00:18:17.400 Stunningly early. JWST keeps sending back images of galaxies that 346 00:18:17.440 --> 00:18:22.559 look remarkably mature, massive, structurally complex, existing at very high redshifts. 347 00:18:22.839 --> 00:18:24.799 That means we're seeing them as they were less than 348 00:18:24.839 --> 00:18:27.519 a billion years, maybe even just a few hundred million 349 00:18:27.559 --> 00:18:29.039 years after the Big. 350 00:18:28.839 --> 00:18:31.480 Bang, and under the standard timeline. 351 00:18:31.160 --> 00:18:34.039 Under the standard LAMBA CDM timeline, which puts the age 352 00:18:34.039 --> 00:18:36.480 of the universe at about thirteen point eight billion years, 353 00:18:36.960 --> 00:18:39.119 there just doesn't seem to be enough time for gravity 354 00:18:39.160 --> 00:18:43.440 to pull matter together, let it cool, form stars, and 355 00:18:43.480 --> 00:18:46.319 assemble these huge, ordered structures so quickly. 356 00:18:46.440 --> 00:18:48.799 It's like finding a fully grown ancient oak tree just 357 00:18:48.880 --> 00:18:52.240 weeks after planting an acorn. Standard physics struggles to explain 358 00:18:52.240 --> 00:18:53.160 that rapid formation. 359 00:18:53.400 --> 00:18:56.640 It's a real tension point. How did structure form so fast? 360 00:18:56.839 --> 00:19:00.160 So how does goop? Does evolving constance Model ceec C 361 00:19:00.240 --> 00:19:01.839 plus TL help with this? 362 00:19:02.119 --> 00:19:05.160 Well, remember how the model combines coverying, coupling constants and 363 00:19:05.240 --> 00:19:09.279 tired light. That combination fundamentally changes how we calculate cosmic 364 00:19:09.319 --> 00:19:12.000 distances and time scales based on redshift. 365 00:19:12.039 --> 00:19:13.720 It recalibrates the cosmic clock. 366 00:19:13.920 --> 00:19:16.799 It effectively stretches out the entire history of the universe. 367 00:19:17.680 --> 00:19:22.400 Gupta's specific calculations based on CVC plus TL suggests the 368 00:19:22.440 --> 00:19:25.240 model almost doubles the inferred age of the universe. 369 00:19:25.440 --> 00:19:28.160 Doubles it wait from thirteen point eight billion. 370 00:19:27.920 --> 00:19:30.720 Years to roughly twenty six point seven billion years. 371 00:19:30.759 --> 00:19:34.880 Twenty six point seven billion years, that's almost thirteen billion 372 00:19:35.079 --> 00:19:37.079 extra years of cosmic history. 373 00:19:37.160 --> 00:19:40.279 It's a monumental difference. Suddenly you have vastly more time 374 00:19:40.319 --> 00:19:42.640 in the early universe, and that extra time, that extra 375 00:19:42.680 --> 00:19:47.319 time provides ample room for the standard processes of gravitational collapse, cooling, 376 00:19:47.480 --> 00:19:51.519 star formation, and galaxy assembly to happen gradually. Those massive 377 00:19:51.559 --> 00:19:54.680 early galaxies seen by web are no longer impossible. They 378 00:19:54.799 --> 00:19:56.599 just had almost twice as long to form as we 379 00:19:56.680 --> 00:19:57.440 previously thought. 380 00:19:57.519 --> 00:20:01.240 So the universe becomes older, maybe ca elmer, more patient 381 00:20:01.440 --> 00:20:02.160 in its evolution. 382 00:20:02.440 --> 00:20:06.240 Exactly. It allows for passive evolution over a much longer timescale, 383 00:20:06.559 --> 00:20:10.480 which fits naturally with the observations without needing exotic super 384 00:20:10.480 --> 00:20:11.839 fast formation scenarios. 385 00:20:12.079 --> 00:20:16.240 That's a really compelling point. It connects two seemingly unrelated 386 00:20:16.519 --> 00:20:21.559 big problems, galaxy rotation and early galaxy formation, and potentially 387 00:20:21.559 --> 00:20:25.440 solves both with the same shift. In fundamental physics, the 388 00:20:25.440 --> 00:20:27.000 evolving constant a. 389 00:20:26.920 --> 00:20:28.559 Strong argument for the model's coherence. 390 00:20:28.640 --> 00:20:31.119 Yes, okay, but let's talk about the practical side the 391 00:20:31.480 --> 00:20:34.839 So what for science today If this theory turns out 392 00:20:34.880 --> 00:20:38.359 to be right, or even partially right, what does it 393 00:20:38.440 --> 00:20:41.119 mean for all the effort going into searching for dark 394 00:20:41.160 --> 00:20:42.000 matter particles? 395 00:20:42.039 --> 00:20:45.880 Right now, that's the potentially enormous consequence. If the effects 396 00:20:45.920 --> 00:20:48.799 we attribute to dark matter are actually due to gravity 397 00:20:48.839 --> 00:20:51.400 behaving differently because constants are evolving. 398 00:20:51.079 --> 00:20:52.920 Then there's no dark matter particle. 399 00:20:52.599 --> 00:20:56.359 Defined correct, No WIMPs, no axions, no exotic particles making 400 00:20:56.440 --> 00:20:59.720 up these halos. It would imply that the massive incredibly 401 00:20:59.759 --> 00:21:02.880