In EiBI gravity, spherical collapse yields lower linear thresholds, higher turnaround and virial overdensities, and modestly smaller turnaround radii than in ΛCDM, with effects increasing with the coupling κ̂_BI.
The Dilaton and Modified Gravity
5 Pith papers cite this work. Polarity classification is still indexing.
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abstract
We consider the dilaton in the strong string coupling limit and elaborate on the original idea of Damour and Polyakov whereby the dilaton coupling to matter has a minimum with a vanishing value at finite field-value. Combining this type of coupling with an exponential potential, the effective potential of the dilaton becomes matter density dependent. We study the background cosmology, showing that the dilaton can play the role of dark energy. We also analyse the constraints imposed by the absence of violation of the equivalence principle. Imposing these constraints and assuming that the dilaton plays the role of dark energy, we consider the consequences of the dilaton on large scale structures and in particular the behaviour of the slip functions and the growth index at low redshift.
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Solar tachocline production of symmetrons yields a keV-scale flux at Earth whose absorption in xenon detectors provides new complementary bounds on symmetron parameter space.
Generalization of scalar-fermion Yukawa systems in constant-EOS cosmologies identifies scaling regime with constant energy density ratio from approximate scale invariance and asymptotic regime recovering bare mass.
Matter modeled as stochastic sources induces stochastic noise and new interactions in the large-scale EFT for light scalars, yielding corrections to the Klein-Gordon equation that can mimic dynamical dark energy or produce a cosmic Meissner effect under full screening.
Proposes gravitational redshift measurements with atomic clocks in varying density environments to constrain the parameter space of the environment-dependent dilaton model, focusing on regions with weak couplings complementary to existing tests.
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Prospect on constraining environment-dependent dilaton model from gravitational redshift measurements
Proposes gravitational redshift measurements with atomic clocks in varying density environments to constrain the parameter space of the environment-dependent dilaton model, focusing on regions with weak couplings complementary to existing tests.