University of Cambridge > Talks.cam > Theoretical Physics Colloquium > The cosmological constant problem (and its sequester)

  Browse A-Z

Log in

University Account External (via Google)

🔐 Log In

Information on

Subscribing to talksdetails Finding a talkdetails Adding a talkdetails Disseminating talksdetails Help and Documentationdetails

ℹ️ Information

The cosmological constant problem (and its sequester)

Download to your calendar using vCal

If you have a question about this talk, please contact Dr Joan Camps .

I will review the notorious cosmological constant problem, sometimes described as the worst fine tuning problem in Physics. I will explain the true nature of the problem, which is one of radiative instability against any change in the effective description. I will recall Weinberg’s venerable no-go theorem that prohibits certain attempts to “solve” this problem before going on to explain a new mechanism that circumvents Weinberg. This is the vacuum energy sequester, a global modification of GR that results in the cancellation of large vacuum energy contributions from a protected matter sector (taken to include the Standard Model) at each and every order in the perturbative loop expansion. Cosmological consequences are a Universe which has finite space-time volume, will ultimately crunch, and for which dark energy can only be a transient.

This talk is part of the Theoretical Physics Colloquium series.

This talk is included in these lists:

Note that ex-directory lists are not shown.

Other lists

WTCC, Hinxton, UK Seminars at the Department of Biochemistry Taking Place: Affective Urban Geographies

Other talks

Title abstract tbc Group Work Cambridge RNA Club - ONLINE TBC Title to be confirmed Title TBC
 

© 2006-2025 Talks.cam, University of Cambridge. Contact Us | Help and Documentation | Privacy and Publicity