New time-dependent solutions of viable Horndeski gravity
Reza Saadati, Andrea Giusti, Valerio Faraoni, Fatimah Shojai
TL;DR
This paper presents novel time-dependent solutions in viable Horndeski gravity, revealing dynamic horizons and singularities in evolving cosmological backgrounds, expanding understanding of scalar-tensor theories beyond Einstein gravity.
Contribution
It introduces new spherical and time-dependent solutions in Horndeski gravity by disforming Einstein solutions, highlighting unique dynamical features not seen in previous scalar-tensor models.
Findings
Solutions describe dynamical objects in FLRW spacetimes
Apparent horizons and evolving singularities are identified
New behaviors of horizons and singularities are observed
Abstract
We generate new spherical and time-dependent solutions of viable Horndeski gravity by disforming a solution of the Einstein equations with scalar field source and positive cosmological constant. They describe dynamical objects embedded in asymptotically FLRW spacetimes and contain apparent horizons and a finite radius singularity that evolve in time in peculiar ways apparently not encountered before in Einstein and "old" scalar-tensor gravity.
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Taxonomy
TopicsCosmology and Gravitation Theories · Geophysics and Gravity Measurements · Black Holes and Theoretical Physics