Nonlinear dark-sector interaction models with a half-saturation sparseness scale are observationally preferred over their linear counterparts at >95% confidence for two of three cases.
Combined cosmological and solar system constraints on chameleon mechanism
2 Pith papers cite this work. Polarity classification is still indexing.
2
Pith papers citing it
abstract
Chameleon mechanism appearing in massive tensor-scalar theory of gravity can effectively reduce locally the non-minimal coupling between the scalar field and matter. This mechanism is invoked to reconcile large-scale departures from general relativity (GR), supposedly accounting for cosmic acceleration, to small scales stringent constraints on GR. In this paper, we carefully investigate this framework on cosmological and solar system scales to derive combined constraints on model parameters, notably by performing a non-ambiguous derivation of observables like luminosity distance and local post-newtonian parameters. Likelihood analysis of type Ia Supernovae data and of admissible domain for the PPN parameters clearly demonstrates that chameleon mechanism cannot occur in the same region of parameters space than the one necessary to account for cosmic acceleration with the assumed Ratra-Peebles potential and exponential coupling function.
citation-role summary
background 1
citation-polarity summary
verdicts
UNVERDICTED 2roles
background 1polarities
background 1representative citing papers
Combined Cassini, LLR, and pulsar observations tighten bounds on scalar-tensor gravity with and without screening, with LLR improving SMG limits by over seven orders of magnitude.
citing papers explorer
-
Saturation Mechanisms in the Interacting Dark Sector
Nonlinear dark-sector interaction models with a half-saturation sparseness scale are observationally preferred over their linear counterparts at >95% confidence for two of three cases.
-
Constraining the scalar-tensor gravity theories with and without screening mechanisms by combined observations
Combined Cassini, LLR, and pulsar observations tighten bounds on scalar-tensor gravity with and without screening, with LLR improving SMG limits by over seven orders of magnitude.