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Talk
Title	The Cosmological Constant Problem (2/2)
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Author(s)	Padilla, Antonio (speaker) (University of Nottingham)
Corporate author(s)	CERN. Geneva
Imprint	2015-11-13. - Streaming video.
Series	(Academic Training Lecture Regular Programme ; 2015-2016)
Lecture note	on 2015-11-13T11:00:00
Subject category	Academic Training Lecture Regular Programme
Abstract	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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Submitted by	maureen.prola-tessaur@cern.ch