Screened fifth forces mediated by dark matter-baryon interactions: Theory and astrophysical probes

Jeremy Sakstein, Harry Desmond, and Bhuvnesh Jain
Phys. Rev. D 100, 104035 – Published 18 November 2019

Abstract

We derive the details of a new screening mechanism where the interactions of baryons and dark matter can be screened according to the local dark matter density. In this mechanism, the value of Newton’s constant is dark matter-density dependent, allowing for the possibility that astrophysical phenomena are very different in galaxies less dense than the Milky Way. The parametrized post-Newtonian parameter γ, which quantifies the difference between kinematical and lensing probes, also depends on dark matter density. We calculate the effects of varying G on various stages of stellar evolution, focusing on observables that impact cosmology: the Cepheid period-luminosity relation and the supernova Ia magnitude-redshift relation. Other potential tests of the model are also investigated including main-sequence, post-main-sequence, and low-mass dwarf stars. Finally, we discuss how extragalactic tests of γ could provide complementary constraints.

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  • Received 15 July 2019

DOI:https://doi.org/10.1103/PhysRevD.100.104035

© 2019 American Physical Society

Physics Subject Headings (PhySH)

Gravitation, Cosmology & Astrophysics

Authors & Affiliations

Jeremy Sakstein1,*, Harry Desmond2,†, and Bhuvnesh Jain1,‡

  • 1Center for Particle Cosmology, Department of Physics and Astronomy, University of Pennsylvania, 209 South 33rd Street, Philadelphia, Pennsylvania 19104, USA
  • 2Astrophysics, University of Oxford, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH, United Kingdom

  • *sakstein@physics.upenn.edu
  • harry.desmond@physics.ox.ac.uk
  • bjain@physics.upenn.edu

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Issue

Vol. 100, Iss. 10 — 15 November 2019

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