4.7 Article

Symmetron scalar fields: Modified gravity, dark matter, or both?

Journal

PHYSICAL REVIEW D
Volume 99, Issue 4, Pages -

Publisher

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.99.043539

Keywords

-

Funding

  1. Leverhulme Trust Research Leadership Award
  2. Royal Society University Research Fellowship
  3. STFC Consolidated Grant [ST/P000703/1]
  4. University of Nottingham
  5. University of Nottingham Vice Chancellor's Scholarship for Research Excellence
  6. STFC [ST/P000703/1] Funding Source: UKRI

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Scalar fields coupled to gravity through the Ricci scalar have been considered both as dark matter candidates and as a possible modified gravity explanation for galactic dynamics. It has recently been demonstrated that the dynamics of baryonic matter in disk galaxies may be explained, in the absence of particle dark matter, by a symmetron scalar field that mediates a fifth force. The symmetron provides a concrete and archetypal field theory within which to explore how large a role modifications of gravity can play on galactic scales. In this article, we extend these previous works by asking whether the same symmetron field can explain the difference between the baryonic and lens masses of galaxies through a modification of gravity. We consider the possibilities for minimal modifications of the model and find that this difference cannot be explained entirely by the symmetron fifth force without extending the field content of the model. Instead, we are pushed toward a regime of parameter space where one scalar field both mediates a fifth force and stores enough energy density that it also contributes to the galaxy's gravitational potential as a dark matter component, a regime which remains to be fully explored.

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