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Modified Gravity with Vector Distortion and Cosmological Applications
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA.ORCID iD: 0000-0002-9403-8565
2017 (English)In: UNIVERSE, ISSN 2218-1997, Vol. 3, no 2, article id 47Article in journal (Refereed) Published
Abstract [en]

We briefly review the basics of Weyl geometry and its natural extension by a general linear "distortion" of the metric connection by a vector field. A special class of the connections has torsion but retains the Weyl's semi-metricity condition. We present ghost-free gravitational theories in this geometrical setup and highlight their possible cosmological applications, such as new self-tuning solutions and new bouncing solutions found in the quadratic-curvature theories. The vector distortion can mimic the cosmological effects of dark matter.

Place, publisher, year, edition, pages
MDPI AG , 2017. Vol. 3, no 2, article id 47
Keywords [en]
modified gravity, Weyl geometry, cosmology
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:kth:diva-211410DOI: 10.3390/universe3020047ISI: 000404620300020Scopus ID: 2-s2.0-85064408123OAI: oai:DiVA.org:kth-211410DiVA, id: diva2:1129480
Note

QC 20170803

Available from: 2017-08-03 Created: 2017-08-03 Last updated: 2019-05-16Bibliographically approved

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Koivisto, Tomi S.

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