Geetanjali is Associate Professor at St. Stephen’s College. She has a PhD in Cosmology from Delhi University. She's working on the Variable Chaplygin Gas model of dark energy.

Reach out to her on LinkedIn: https://www.linkedin.com/in/geetanjali-sethi-a7b201aa/?originalSubdomain=in

Find her research work on Google Scholar: https://scholar.google.com/citations?user=EK8KFB0AAAAJ

Back to the Stone Age is on:

- YouTube: https://youtube.com/playlist?list=PLZrhMJ5eusE_ACw6Ec3TqCbvDVZ6HP809&si=WhVnrLLAUuYW-Any

- Spotify: https://open.spotify.com/show/3pT8MUeR8bskcsuu8gmUGK

- Apple Podcast: https://podcasts.apple.com/us/podcast/back-to-the-stone-age/id1741219288

Outline

00:00 - Introduction

00:15 - Energy

02:53 - Dark matter and dark energy

10:15 - Dark energy as expansion of the universe

12:11 - Energy of empty space

17:08 - Heisenberg uncertainty principle

21:54 - Why dark energy has constant energy density

26:35 - Friedmann-Lemaitre-Robertson-Walker cosmological model

33:58 - Quintessence, modified gravity models

39:08 - Variable Chaplygin Gas model

39:40 - Cosmic fluid

43:34 - Differences with other models

48:19 - Fine-tuning in nature

53:31 - Combination of dark matter and dark energy

56:09 - Dependency of observations for the future of the universe

58:40 - Most interesting fact about the cosmos

59:24 - Making sense of enormous distances

01:05:42 - Will the universe expand forever?

01:11:38 - AI and science

01:13:01 - Limitations of human brain

01:17:45 - Conclusion