Academic Training Lecture Regular Programme

The Cosmological Constant Problem (1/2)

by Antonio Padilla (University of Nottingham, UK)

503/1-001 - Council Chamber (CERN)

503/1-001 - Council Chamber


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I will review the cosmological constant problem as a serious challenge to our notion of naturalness in Physics. Weinberg’s no go theorem is worked through in detail. I review a number of proposals possibly including Linde's universe multiplication, Coleman's wormholes, the fat graviton, and SLED, to name a few. Large distance modifications of gravity are also discussed, with causality considerations pointing towards a global modification as being the most sensible option. The global nature of the cosmological constant problem is also emphasized, and as a result, the sequestering scenario is reviewed in some detail, demonstrating the cancellation of the Standard Model vacuum energy through a global modification of General Relativity.
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Sponsor: Sergey Sibirakov