# Cosmological fluctuations and conservation laws

- Institution: CERN
- Department: CERN Miscellaneous Lectures
- Speaker: Steven Weinberg
- Year: 2003
- Language: English
- Source: [CERN](https://videos.cern.ch/record/3024455)
- Licence: [CERN](http://copyright.web.cern.ch)
- Who can watch: Teens profiles and older (sources give no ratings; placed by Invisible Network from the source's own words)

In order to use observations of the anisotropy and polarization of the cosmic microwave background to learn about inflation, it is necessary to rely on conservation laws that apply outside the horizon. The general conservation law for both scalar and tensor modes is derived as a version of Goldstone's theorem. The damping of tensor modes after they re-enter the horizon is calculated..

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## Lectures

1. [Cosmological fluctuations and conservation laws](https://invisiblenetwork.ai/learn/cern/3024455/43d89d4aeca3), 53 min (CERN's player)