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Modified Gravity with Vector Distortion and Cosmological Applications
- Jimenez, Jose Beltran (author)
-
- Koivisto, Tomi S. (author)
- Stockholms universitet,KTH,Nordic Institute for Theoretical Physics NORDITA,Nordiska institutet för teoretisk fysik (Nordita)
- (creator_code:org_t)
- 2017-05-24
- 2017
- English.
- In: Universe. - : MDPI AG. - 2218-1997. ; 3:2
- Journal article (peer-reviewed)
Abstract
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- 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.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Keyword
- modified gravity
- Weyl geometry
- cosmology
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- art (subject category)
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