Phil Halper (aka Skydivephil) | Did the Universe Begin? Rethinking the Penrose Hawking & BGV theorems @PhilHalper1 | Uploaded July 2023 | Updated October 2024, 1 week ago.
The Big Bang happened but was it really the beginning of time? Two theorems are often used to suggest it was: The Penrose Hawking Theorem and the BGV Theorem . But new papers out in 2023 have re examined the issue of the beginning and come to a surprising conclusion. We talk to Roger Penrose, Alan Guth, Alex Vilenkin, Ghazal Geshnizjani, Robert Brandenberger, Damien Easson and Niayesh Afshordi to discuss the ultimate question of whether or not the universe had a beginning. A timeline is below.

0:00 Introduction
0:46 Penrose Hawking
2:50 Roger Penrose
4:18 Past eternal Inflation?
6:18 Tricked by coordinates
7:27 De Sitter Space
9:07 Beyond the BGV
10:42 An ambiguity in the BGV
11:48 Many things are possible
14:00 Viability of the Bounce
14:56 Beyond Einstein
16: 28 Cuscuton Bounce
18:28 G bounce
19:54 Emergent Universe
21:39 What does it mean?