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Topology and Dark Energy: Testing Gravity in Voids

Phys. Rev. Lett. 111, 241103 – Published 11 December 2013
Douglas Spolyar, Martin Sahlén, and Joe Silk

Abstract

Modified gravity has garnered interest as a backstop against dark matter and dark energy (DE). As one possible modification, the graviton can become massive, which introduces a new scalar field—here with a Galileon-type symmetry. The field can lead to a nontrivial equation of state of DE which is density and scale dependent. Tension between type Ia supernovae and Planck could be reduced. In voids, the scalar field dramatically alters the equation of state of DE, induces a soon-observable gravitational slip between the two metric potentials, and develops a topological defect (domain wall) due to a nontrivial vacuum structure for the field.

DOI: http://dx.doi.org/10.1103/PhysRevLett.111.241103

  • Figure
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  • Received 22 April 2013
  • Revised 27 September 2013
  • Published 11 December 2013

© 2013 American Physical Society

Authors & Affiliations

Douglas Spolyar1, Martin Sahlén2, and Joe Silk1,2,3

  • 1Institut d’Astrophysique de Paris, 98 bis boulevard Arago, 75014 Paris, France
  • 2BIPAC, Department of Physics, University of Oxford, Denys Wilkinson Building, 1 Keble Road, Oxford OX1 3RH, United Kingdom
  • 3Department of Physics and Astronomy, The Johns Hopkins University, 3400 North Charles Street, Baltimore, Maryland 21218, USA

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