Before the Big Bang 4 : Eternal Inflation & The Multiverse
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Interviews with Alan Guth & other leading cosmologists going into far more depth than average tv show but still accessible to the interested layperson. What happened before the big bang? In this series of films we explore competing models of the early universe, with this episode focusing on the dominant paradigm for early universe cosmology: inflation. The father of inflationary theory Alan Guth takes us on a tour of inflationary theory and explains why cosmologists find it so compelling and why it leads to a multiverse. Fellow theorists Anthony Aguirre and Yasunori Nomura help us explore more of the details of the theory and try to answer many of its challenges. George Efstathiou, one of the world’s leading observational cosmologists (who gave the press conference for the European Space Agency’s Planck cosmology results ) helps us assess the empirical status of the theory. We cover such topics as what is the history and evidence for inflation? how does it lead to a multiverse? Is there empirical evidence for a multiverse? How did the arrow of time form? What is the future for cosmology? What about the supposed problems of inflation, such as unlikely initial conditions, speculative physics, Boltzman brains and the measure problem? Can eternal inflation be past as well as future eternal? Did the universe have an absolute beginning or has it always existed? Whats the connection between the multiverse and black holes? What is the connection between the quantum many worlds and the cosmological multiverse? PLEASE NOTE: All the scientists in this film viewed a draft and approved it before we released it to youtube. For our earlier films in this series see here: https://www.youtube.com/watch?v=QqjsZEZMR7I&list=PLJ4zAUPI-qqqj2D8eSk7yoa4hnojoCR4m For a timeline of who says what when , see below: AG=Alan Guth, AA =Anthony Aguirre, GE= George Efstathiou , YN =Yasunori Nomura 00:00 introduction 1:06 AG on the monopole problem and the founding of inflation 2:37 AG on the problems inflation solves 5:14 AA on how inflation solves the problems 6:02 narration on virtual particles/inflation and then introducing George Efstathiou 6:45 GE on Planck launch 7:23 GE on evidence for inflation 9:17 AG on how inflation to leads to eternal inflation 11:47 AG explains a scalar field 12:30 narration on inflaton field 12:41 GE on Planck data strongly favouring eternal inflation and the multiverse 13:48 narration on direct detection of other universes 13:55 AA explains looking for bubble collision 18:27 AG on string theory and eternal inflation 19:37 AA on above subject 19:59 YN on above subject 20:36 narration on the critics of inflation 20:49 AG on Coleman de lucia tunneling 22:17 YN on higgs instability blocking inflation 24:03 AG on probability of inflation 24:35 Ag on the measure problem 26:16 YN on above 27:13 AG on Boltzman brains 30:52 AG on inflation before or after the big bang? 31:37 GE on the above 32:22 AG on past eternal universe, entropy etc 38:39 AA on above 40:23:19 narration on anthropics 40:45 AG on above 42:30 YN on above 42:59 narration on many world = multiverse 43:31 YN on above 43:29 Yn on static quantum multiverse 49:05 GE on is the multiverse science? 49:56 YN on falsifiability 50:47 narration on alternatives 50:53 AA on alternatives and B modes 53:47 narration on tilt of the gravity wave spectrum 54:04 AG on tilt and string gas cosmology 54:31 GE on above 54:59 AG on before inflation 55:45 AG on next steps 57:45 GE on beyond Planck 59:10 end narration
Comments
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Does inflation and expansion of universe mean same. My doubt is where is universe expanding ? I mean into what ? Where it is acquiring space from ?
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The Dark Star Cosmology Model – An Alternative to Inflation Theory *** In this Cosmological model the Big Bang is caused by a reversible, adiabatic reaction from a maximum energy phase of spacetime into a pure radiation phase consisting of grand-unified bosons and gravitons. This decay reaction occurs in flat spacetime. It is completed during the early part of the Planck Epoch so that by the Planck time what emerges is a flat, homogeneous radiation phase. The initial phase of spacetime is characterized by the Planck density and the highest attainable Hubble constant for flat spacetime. This initial state is completely homogenous and it may be a perfect crystalline state devoid of defects, i.e. a very low entropy state. The thermodynamic properties of the maximum energy phase of spacetime are given by the Planck units (T, P density, volume, mass, and a proposed value for the Planck entropy), which suggests that the fundamental constants of physics emerge from the thermodynamic properties of this phase of spacetime. In addition, the maximum energy phase of spacetime would form in the core of dark stars (black holes). The existence of a core allows the dark star to grow faster than it evaporates eventually reaching a critical size where it de-stabilizes and starts the rapid Big Bang expansion. This continued growth of dark stars may due to the interaction of strong magnetic fields produced by the core with the surrounding spacetime. For example, strong magnetic fields near the core could produce Higgs bosons from spacetime and these in turn decay into quarks and leptons that contribute new mass to the core. The Planck charge of the maximum energy spacetime quanta and the spinning of the core are the proposed cause of these fields. **** This Cosmology model is a type of multiverse system where all universe systems have the same basic evolution and bulk thermodynamic properties. Each universe produces billions or more of the seed dark stars that create future offspring universe systems. The growth of a seed probably takes several trillion years, which creates a great separation between any two seed dark stars. A multiverse system begins with a parent dark star. This parent may form from the collapse of a Bose-Einstein condensate of the ground state phase of spacetime, i.e. dark energy as the Cosmological constant. The BEC parent dark stars are expected to form in regions of the infinite ground state of spacetime which are remote (and unentangled ?) from existing multiverse systems. In the dark star Cosmological model an infinite number of eternally reproducing multiverses exist within an infinite flat four dimensional spacetime which has the ground state energy density. These universe systems are never expected to collide. **** Spacetime is quantized by Planck volumes and its expansion is driven by the creation of new spacetime quanta. The rate of spacetime volume-quanta creation depends on its energy density. The Planck volume-quanta of flat spacetime form a geometric tiling that fills three dimensional space. The concept of the arrow of time could emerge from the irreversible expansion of pure spacetime in its flat ground state. A possible mechanism for this expansion could be analogous to the Casmir effect. Quantum fluctuations cause small density waves in the ground state phase. As a result of these waves the Planck volumes can undergo minute density changes on the order of the Planck time. However, about every 9 billion years constructive interference of these density waves produces a doubling of the ground state density within a Planck volume, i.e. a metastable state. This event triggers the creation of a new ground state spacetime quantum with the original flat density. The 9 billion year figure comes from the Hubble constant that is calculated from Relativity theory using the density of the ground state, e.g. Planck (2015) CMB studies. The above process also may be somewhat analogous to the spontaneous creation of quarks from the ground state by the action of the strong force. **** The connection of this picture of spacetime to string theory could be the result of a series of projections of the energy state within the Planck volume onto the 2-dimensional surfaces of the geometric tilling. Somewhat similar to the Holographic principle, the idea is that this projection can be made without any loss of information. Then we repeat this projection of the energy state from the 2-d surfaces onto the 1-d edges of the tilling element without any loss of information. It is the projected energy vibrations of these 1-d edges that would be described by a type of string-lattice theory or perhaps string network condensate theory.
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If everything was packed to a such high density at the beginning of Big Bang does not that mean that all the particles in the universe also was being entangled with each other at that time and still are? Providing that they all was being entangled at the beginning of Big Bang could the mean that this resulted in the creation of space it self?
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Happy to find out some cutting edge science presented at a deeper quality level. I'm subscribing now. Thank you so much for your work and keep going!
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how could multiverse even make sense?
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Universe may be expanding and colliding,and in this moment we are seeing only expanding part,,may be possible
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before bigbang there was big compression,and before before big compression there was big bang so on,infinitely..
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Very nice, BUT WHY THE FECK DO YOU PEOPLE NOT GIVE THE BROADCAST OR PRODUCTION DATE OF THE VIDEO?? Surely you know better than this.
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ugh I don't feel like listening to an hour of this nonsense.
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thanx for the upload, i was reading wikipedia once more about eternal inflation and thought lets check youtube if there is something new about it and bam! you made my day..**
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Wow, skydive, you're the only Youtuber who does these kind of videos... Correction, you're the only and the cutest Youtuber who does these videos :D Excellent work!
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wow, someone bothered to do a video where the sound levels are consistent! Yes! And I like the presenter, she has a great voice for this.
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This was so much better than the steady diet of shit we are given by shows in the Science channel and the History channel.
We need more of this stuff so that when people listen to Crackpots like William Lane Craig the can determine that he is misrepresenting the Inflation Theory as if it was the singularity that created the Universe.
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This inflation/multiverse thing is a complete rubbish. These arrogant so called scientists think they know everything. I think Alan guth should stop calling it simple only after he can answer what this "peculiar state of matter" is. And he he can explain what quantum is.
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This is fantastic. I have been lamenting the general lack of intermediate level documentaries (for lack of a better term) on cosmology, and this really seems to fill that void. Hope you one day have the chance to interview Steinhardt/Turok in the same way you did here with Alan Guth.
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Automatic captions prevented. Thanks a lot, skydivephil.
I guess you hate deaf people. -
but universe includes the spiritual world angels. The bible said 2nd heaven is the starfield, not universe. Universe is the three heavens combined, is the kingdome of God.
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It is mathematically proven that there are infinites bigger than other infinites. So, infinites are somehow, someway separated by themselves.... How we may never know. This is a tantalizing clue multiverse is real possibility.
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