Lectures on the Cosmological Constant Problem

By Antonio Padilla. 2015

186 citations recorded by the source corpus.

These lectures on the cosmological constant problem were prepared for the X Mexican School on Gravitation and Mathematical Physics. The problem itself is explained in detail, emphasising the importance of radiative instability and the need to repeatedly fine tune as we change our effective description. Weinberg's no go theorem is worked through in detail. I review a number of proposals 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.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/c5705866f58f3e4a33c8ffb31929d1e36c8d0a9e

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Citations in the corpus

Dynamical systems applied to cosmology: Dark energy and modified gravity (2017, methodology): “For more details we refer the reader to the classic reviews of Weinberg (1989, 2000), and more recent reviews by Carroll (2001), Martin (2012) and Padilla (2015).”
Cosmological tests of modified gravity (2015, background): “Any new additions to the matter sector or higher order loop contributions spoil the tuning (see a recent review [21]).”