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Before the Big Bang 4 : Eternal Inflation & The Multiverse

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

Видео Before the Big Bang 4 : Eternal Inflation & The Multiverse канала skydivephil
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28 июня 2016 г. 12:29:26
00:59:54
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