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Effectively nonlocal metric-affine gravity
Stockholm University, Nordic Institute for Theoretical Physics (Nordita).
Stockholm University, Nordic Institute for Theoretical Physics (Nordita). University of Oslo, Norway.
Number of Authors: 3
2016 (English)In: Physical Review D, ISSN 2470-0010, Vol. 93, no 6, 064081Article in journal (Refereed) Published
Abstract [en]

In metric-affine theories of gravity such as the C-theories, the spacetime connection is associated to a metric that is nontrivially related to the physical metric. In this article, such theories are rewritten in terms of a single metric, and it is shown that they can be recast as effectively nonlocal gravity. With some assumptions, known ghost-free theories with nonsingular and cosmologically interesting properties may be recovered. Relations between different formulations are analyzed at both perturbative and nonperturbative levels, taking carefully into account subtleties with boundary conditions in the presence of integral operators in the action, and equivalences between theories related by nonlocal redefinitions of the fields are verified at the level of equations of motion. This suggests a possible geometrical interpretation of nonlocal gravity as an emergent property of non-Riemannian spacetime structure.

Place, publisher, year, edition, pages
2016. Vol. 93, no 6, 064081
National Category
Physical Sciences
URN: urn:nbn:se:su:diva-129665DOI: 10.1103/PhysRevD.93.064081ISI: 000373107800003OAI: diva2:930358
Available from: 2016-05-23 Created: 2016-04-27 Last updated: 2016-05-23Bibliographically approved

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Koivisto, TomiSandstad, Marit
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