Modified gravity approaches to the cosmological constant problem

Aliki Litsa; Benjamin Bose; Florian Niedermann; Guilherme Franzmann; Steffen Hagstotz; The FADE Collaboration: Heliudson Bernardo; Yutong He

Modified gravity approaches to the cosmological constant problem

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arxiv 2210.06810 v1 pith:SR2AWPAV submitted 2022-10-13 gr-qc astro-ph.COhep-th

Modified gravity approaches to the cosmological constant problem

The FADE Collaboration: Heliudson Bernardo , Benjamin Bose , Guilherme Franzmann , Steffen Hagstotz , Yutong He , Aliki Litsa , Florian Niedermann This is my paper

classification gr-qc astro-ph.COhep-th

keywords cosmologicalgravityapproachesconstantgeneralproblemsrelativityassociated

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The cosmological constant and its phenomenology remain among the greatest puzzles in theoretical physics. We review how modifications of Einstein's general relativity could alleviate the different problems associated with it that result from the interplay of classical gravity and quantum field theory. We introduce a modern and concise language to describe the problems associated with its phenomenology, and inspect no-go theorems and their loopholes to motivate the approaches discussed here. Constrained gravity approaches exploit minimal departures from general relativity; massive gravity introduces mass to the graviton; Horndeski theories lead to the breaking of translational invariance of the vacuum; and models with extra dimensions change the symmetries of the vacuum. We also review screening mechanisms that have to be present in some of these theories if they aim to recover the success of general relativity on small scales as well. Finally, we summarise the statuses of these models in their attempt to solve the different cosmological constant problems while being able to account for current astrophysical and cosmological observations.

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