Modified Gravity Approaches to the Cosmological Constant Problem

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Bernardo, HeliudsonMcGill Univ, Dept Phys, Ernest Rutherford Phys Bldg,3600 Rue Univ, Montreal, PQ H3A 2T8, Canada. (author)

Modified Gravity Approaches to the Cosmological Constant Problem

Article/chapterEnglish2023

Publisher, publication year, extent ...

2023-01-20
MDPI,2023
printrdacarrier

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LIBRIS-ID:oai:DiVA.org:kth-325088
https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-325088URI
https://doi.org/10.3390/universe9020063DOI
https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-215786URI

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Language:English
Summary in:English

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QC 20230329
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 summarize the statuses of these models in their attempts to solve the different cosmological constant problems while being able to account for current astrophysical and cosmological observations.

Subject headings and genre

NATURVETENSKAP Fysik Astronomi, astrofysik och kosmologi hsv//swe
NATURAL SCIENCES Physical Sciences Astronomy, Astrophysics and Cosmology hsv//eng
cosmological constant problem
modified gravity
self-tuning

Added entries (persons, corporate bodies, meetings, titles ...)

Bose, BenjaminUniv Geneva, Dept Phys Theor, 24 Quai Ernest Ansermet, CH-1211 Geneva, Switzerland.;Univ Edinburgh, Inst Astron, Royal Observ, Blackford Hill, Edinburgh EH9 3HJ, Scotland.;Basic Res Community Phys eV, Veddeler Bruckenstr 122, D-20539 Hamburg, Germany. (author)
Franzmann, GuilhermeStockholms universitet,Nordiska institutet för teoretisk fysik (Nordita),Basic Research Community for Physics e.V., Germany,Basic Res Community Phys eV, Veddeler Bruckenstr 122, D-20539 Hamburg, Germany.; Nordita SU, Hannes Alfvens Vag 12, SE-10691 Stockholm, Sweden.;Stockholm Univ, Hannes Alfvens vag 12, SE-10691 Stockholm, Sweden.(Swepub:su)gufr4256 (author)
Hagstotz, SteffenLudwig Maximilians Univ Munchen, Univ Sternwarte, Fak Phys, Scheinerstr 1, D-81679 Munich, Germany.;Excellence Cluster ORIGINS, Boltzmannstr 2, D-85748 Garching, Germany. (author)
He, YutongStockholms universitet,Nordiska institutet för teoretisk fysik (Nordita),Oskar Klein-centrum för kosmopartikelfysik (OKC),Nordita SU, Hannes Alfvens Vag 12, SE-10691 Stockholm, Sweden.;Stockholm Univ, Hannes Alfvens vag 12, SE-10691 Stockholm, Sweden.;Stockholm Univ, Oskar Klein Ctr Cosmoparticle Phys, Roslagstullsbacken 21A, SE-10691 Stockholm, Sweden.(Swepub:su)yuhe7392 (author)
Litsa, AlikiStockholms universitet,Fysikum,Oskar Klein-centrum för kosmopartikelfysik (OKC),Stockholm Univ, Oskar Klein Ctr Cosmoparticle Phys, Roslagstullsbacken 21A, SE-10691 Stockholm, Sweden.(Swepub:su)alli4843 (author)
Niedermann, FlorianStockholms universitet,Nordiska institutet för teoretisk fysik (Nordita),Nordita SU, Hannes Alfvens Vag 12, SE-10691 Stockholm, Sweden.;Stockholm Univ, Hannes Alfvens vag 12, SE-10691 Stockholm, Sweden.(Swepub:su)flni8051 (author)
McGill Univ, Dept Phys, Ernest Rutherford Phys Bldg,3600 Rue Univ, Montreal, PQ H3A 2T8, Canada.Univ Geneva, Dept Phys Theor, 24 Quai Ernest Ansermet, CH-1211 Geneva, Switzerland.;Univ Edinburgh, Inst Astron, Royal Observ, Blackford Hill, Edinburgh EH9 3HJ, Scotland.;Basic Res Community Phys eV, Veddeler Bruckenstr 122, D-20539 Hamburg, Germany. (creator_code:org_t)

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In:Universe: MDPI9:22218-1997

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