# Cosmology without a beginning

- Institution: CERN
- Speaker: Gabriele Veneziano
- Year: 2000
- Language: English
- Subjects: Astronomy and space
- Source: [CERN](https://videos.cern.ch/record/3023736)
- Licence: [CERN](http://copyright.web.cern.ch)
- Who can watch: Tweens profiles and older (sources give no ratings; placed by Invisible Network from the source's own words)

Most of the puzzles with standard big bang cosmology can be avoided if the big bang is NOT identified with the beginning of time. The short-distance cutoff and duality symmetries of superstring theory suggest a new (so-called pre-big bang) cosmology in which the birth of our Universe is the result of a long classical evolution characterized by a gravitational instability. I will motivate and describe this heretical scenario and compare its phenomenological implications with those of ortodox (post-big bang) inflation..

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## Lectures

1. [Cosmology without a beginning](https://invisiblenetwork.ai/learn/cern/3023736/ab3eba799ceb), 1 h 29 min (CERN's player)