Scalar-tensor cosmologies without screening

Aug 11, 2020
10 pages
Published in:
  • JCAP 01 (2021) 045
  • Published: Jan 22, 2021
e-Print:

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Abstract: (IOP)
Scalar-tensor theories are frequently only consistent with fifth force constraints in the presence of a screening mechanism, namely in order to suppress an otherwise unacceptably large coupling between the scalar and ordinary matter. Here we investigate precisely which subsets of Horndeski theories do not give rise to and/or require such a screening mechanism. We investigate these subsets in detail, deriving their form and discussing how they are restricted upon imposing additional bounds from the speed of gravitational waves, solar system tests and cosmological observables. Finally, we also identify what subsets of scalar-tensor theories precisely recover the predictions of standard (linearised) ΛCDM cosmologies in the quasi-static limit.
Note:
  • 10 pages, 1 figure
  • scalar tensor
  • screening
  • cosmological model
  • gravitational radiation
  • statistical analysis
  • solar system
  • dark matter
  • fifth force