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Generalised scalar-tensor theories and self-tuning
Univ Nottingham, Sch Phys & Astron, Nottingham NG7 2RD, England.;Univ Nottingham, Nottingham Ctr Grav, Nottingham NG7 2RD, England..
Univ Nottingham, Sch Phys & Astron, Nottingham NG7 2RD, England.;Univ Nottingham, Nottingham Ctr Grav, Nottingham NG7 2RD, England..
Nordita SU .;Stockholm Univ, Hannes Alfvens Vag 12, SE-10691 Stockholm, Sweden..
Univ Nottingham, Sch Phys & Astron, Nottingham NG7 2RD, England.;Univ Nottingham, Nottingham Ctr Grav, Nottingham NG7 2RD, England..
2022 (English)In: Journal of Cosmology and Astroparticle Physics, E-ISSN 1475-7516, no 3Article in journal (Refereed) Published
Abstract [en]

We explore a family of generalised scalar-tensor theories that exhibit self-tuning to low scale anti de Sitter vacua, even in the presence of a large cosmological constant. We are able to examine the linearised fluctuations about these vacua and compute the corresponding amplitude. Thanks to a subtle interplay between a weak scalar coupling and a low scalar mass, it is possible to exhibit self-tuning and compatibility with solar system tests of gravity without resorting to non-linearities and unreliable screening mechanisms. The weakness of the scalar coupling and the correspondingly slow response to vacuum energy phase transitions may present some interesting possibilities for connecting early universe inflation to the cancellation of vacuum energy.

Place, publisher, year, edition, pages
IOP Publishing , 2022. no 3
Keywords [en]
M, Cheung et al, modified gravity, dark energy theory
National Category
Astronomy, Astrophysics and Cosmology Subatomic Physics
Identifiers
URN: urn:nbn:se:kth:diva-310598DOI: 10.1088/1475-7516/2022/03/004ISI: 000766775200005Scopus ID: 2-s2.0-85126290875OAI: oai:DiVA.org:kth-310598DiVA, id: diva2:1649824
Note

QC 20220405

Available from: 2022-04-05 Created: 2022-04-05 Last updated: 2023-09-25Bibliographically approved

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