Birth of baby universes from gravitational collapse in a modified-gravity scenario

Author:

Masó-Ferrando Andreu,Sanchis-Gual Nicolas,Font José A.,Olmo Gonzalo J.

Abstract

AbstractWe consider equilibrium models of spherical boson stars in Palatinif(ℛ) = ℛ +ξ2gravity and study their collapse when perturbed. The Einstein-Klein-Gordon system is solved using a recently established correspondence in an Einstein frame representation. We find that, in that frame, the endpoint is a nonrotating black hole surrounded by a quasi-stationary cloud of scalar field. However, the dynamics in thef(ℛ) frame is dramatically different. The innermost region of the collapsing object exhibits the formation of a finite-size, exponentially-expandingbaby universeconnected with the outer (parent) universe via a minimal area surface (a throat or umbilical cord). Our simulations indicate that this surface is at all times hidden inside a horizon, causally disconnecting the baby universe from observers above the horizon. The implications of our findings in other areas of gravitational physics are also discussed.

Publisher

IOP Publishing

Subject

Astronomy and Astrophysics

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