Dark Matter vs Modified Gravity | Sean Carroll

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1. modified gravity got a great boost last week from the university of Amsterdam.
2. CMB theory is wrong. I studied cosmology from the Big Bang and found that the plasma of the early universe trapped the energy of the annihilation of the matter and antimatter. But, when the plasma was transformed into neutral matter, the trapped energy escaped and it's reaching us now but it has been Doppler shifted into the microwave end of the EM spectrum.
   
   Imagine that the plasma was spherical in shape and expanding in size in all directions. When it became neutral matter thus releasing the trapped energy, the released energy was travelling at the speed of light away from the gas cloud in all directions. It's a gas cloud because it's made of 75% hydrogen, 25% helium and traces of lithium.
   
   Now the stars, planets, and galaxies were formed out of this gas cloud. So how can we receive the released energy when it's moving away from us at the speed of light? The obvious answer is we can't. The CMB we're detecting is the energy given off by stars with far away galaxies which has been Doppler shifted into the microwave region of the EM spectrum.
   
   The CMB is NOT the energy of the matter-antimatter annihilation process.
3. Wait where are the people with their personal views on science saying Sean's wrong without addressing any of the central points of the lecture and/or publishing their peer-reviewed paper that refutes the theory of dark matter.... Oh wait never mind I found them.
   They must of just come over from the black hole videos. I love you internet.
4. Does dark matter control the universe with its dark energy something like prime numbers of the numbers system and do they have specific positions in the universe so that we see the universe the way they exist.
5. https://read.amazon.com.au/kp/embed?asin=B01N8TV0R4&preview=newtab&linkCode=kpe&ref_=cm_sw_r_kb_dp_d8vjybP4N5HW7
   
   How can anyone remain unresolved with blunders such as the problem of evil and freewill in-compatibilism? It is utterly misleading and delusional that personalities such as Dr. Sean Carroll are of this view (on problem of evil). This work is a challenge for what it contains as refutation for this mired in the sciences of philosophy. I would like to draw the reader’s attention to the fact that, there are many authors expressing their views on the subject, I'm in way slightly different because of the fact that my narrative is Quranic. It is a Muslim view on a subject hugely debated in the western world.
6. So dark matter and dark energy can only be explained through gravity? or its a byproduct of gravity?or both?or none?or what?
   Im not a science wizard so sorry if thats a stupid question, mass confusion.
7. He is so dogmatic. No wonder it took him years to connent Einstein's thought experiment to the visualisation of space time curvature.
8. Here's a possible refutation of Einstein's box. The boxes are 1 Earth Diameter wide. One sits on Earth, one accelerates through space.
9. On this topic see on Amazon: “DARK MATTER AND DARK ENERGY, SPACE AND TIME, AND OTHER PSEUDO-NOTIONS IN COSMOLOGY” by Gabriel Vacariu (Author), Mihai Vacariu (Author): Dark matter and dark energy. Two notions that have troubled cosmologists for a long time. Why? Because they don’t have a “satisfactory” definition, and nobody can identify the “matter” or “forces” that govern them. Currently, we can only deduce the existence of these two notions from the strange movement of the galaxies and the manner they move away from one another, with increasing speed. However, these are not the only mysteries that cosmology cannot yet explain. What happened before the Big Bang? Is the universe still expanding (cosmic inflation)? What is the relation between the theory of relativity and the laws of quantum mechanics? What if the answers to all these questions were far more accessible than researchers thought? What if the real “culprit” for their absence was in fact the framework used by cosmologists, a framework that involves the existence of space and time? With the help of the Epistemologically Different Worlds paradigm, Gabriel and Mihai Vacariu aim to offer an answer to all these questions and many others.
   [Also, at my webpage, five books free, topics on: cognitive (neuro)science, philosophy (of mind), physics, and biology]
10. Hi Commentator, a name would have been nice. The unexpected behaviours of gravity on large scales are caused not by large scale cosmic movements but are due to the spectral signature of light being used as an rule which as it developes is elastic in nature. Light can and does change it'd spectral signature by passing near to a gravity well and gains energy by the classic slingshot effects (see gravity lensing). It is also slowly reduced by long distance travel, and it is this effect that scientists use to denote the galactic distances traveled. The problem is that during multi-billion light year travel, It is quite normal for light to encounter any one of many types of gravity wells and in this way alters the light spectral signature, hence the elastic ruler. As for DARK MATTER to explain a 95% error in the amount of matter in the cosmos. Come on, If you believe that then you will believe anything. The way I look at things is If it seems unbelievable then it is probably untrue. At the very least it needs looking into. There are a few things that could account for dark matter and the first that comes to mind is the multi-big bang theory, but the bangs don't necessarily have to be near. A100,000 times the distance of our expanding universe would make the gravitational effect minimal but would still be there as a gravitational node. The more big bangs within the past, present and the future then the more even will be their combined effects. A second idea is occlusion. When you see a nearby star then that star will occlud a conical area of space behind it, which if taken far enough will be a very large piece of space. Multiply this effect by the number of stars out to infinity and the amount of matter occlude by all the stars would be gigantic, and it is the stars that can b seen that are used to make an estimate of how much matter there is within the cosmos. Just how far away would another big bang have to be to not have an effect on our universe? To summarize, there many known and unknown effects in space that can and do change things or change our perspective of space and to make grand verbal gestures without any contributing evidence or at the very least a passable theory can cause misconceptions to be made, and believe you me there are very many of those around.
    Regards to all
    MoK
11. why can't we detect that we are feeling gravity and the elevator is not going up because we can detect difference as the gravity increases as we go up
12. Einstein didn't like the geometrical interpretation of general relativity. Weyl & others popularized this interpretation
13. Sean Carroll does not know shit.
14. Instead of MOND just trying to use tweaks to gravity...what about factoring in time dilation on larger scales? e.g. the larger the a region included, the larger the mass, the larger the mass, the slower the time.
    
    So were time adjustments factored in along with gravitational adjustments?
15. 5:37 Sean was serious here. But age naturally causes gray hair. Einstein thought up relativity and grew older too. A scientist should not place too much value on correlation.
16. einstein's general relativity is completely wrong about gravity and that's the reason why physicists can't fuse quantum mechanics and general relativity. quantum mechanics interprets forces as particles, and gravity has a particle called graviton while relativity states that there is g force but only the curvature of space. but the thing is gravity causes the curvature of space, it has a field and this field has gravitons that interacts with Higgs bosons.
17. Sean Carroll, You are typical of the blind leading the blind. Dark matter doesn't exist, it is a figment of many astronomical scientists imagination and obviously still adhere to the single big bang theory. Wake up people and get with the multi big bang theory which doesn't allow for dark Matter as there would be more than enough matter for everyone. But no you would have to lose face and admit you are wrong to accept something so, radical.
    MoK
18. All matter has to exert a force to exist, and that force has to act about a nominal point or fulcrum in space.
    
    Anti matter is equal to that force the mass creates through being matter.
    
    Therefore, as force cannot been seen, antimatter is invisible as it has no physical substance .
    
    The point of application of all matter exists in all planes in space, therefore, if you hold your finger in the air you can balance all matter and anti matter off the tip.
    
    That's my theory
    
    Chris
19. "... somehow reproduce MOND ..." If string vibrations are uniform with respect to the fundamental geometric tensor, then there is only one plausible way, namely the Fernández-Rañada-Milgrom effect.
20. "We don't understand what the dark matter is." Google "witten milgrom". If MOND is wrong, then how did Milgrom convince McGaugh & Kroupa? If dark matter particles exist, then why do the sun, planet Jupiter, & planet Earth seem to lack dark matter haloes?
    “MOND is an alternative paradigm to Newtonian dynamics, whose original motivation was to explain the mass discrepancies in galactic systems without invoking dark matter (DM) … The MOND predictions concerning the mass discrepancies in galactic systems depend only on the present day baryon distribution. In contrast, the expected discrepancies; i.e., the relative quantities and distributions of baryons and DM in such systems depend strongly on their unknown (and unknowable) formation history …” — Mordehai Milgrom
    http://arxiv.org/pdf/0801.3133v2.pdf “The MOND Paradigm”, Mordehai Milgrom, 2008