Spikes and matter inhomogeneities in massless scalar field models

Abstract

We shall discuss the general relativistic generation of spikes in a massless scalar field or stiff perfect fluid model. We first investigate orthogonally transitive (OT) $G_2$ stiff fluid spike models both heuristically and numerically, and give a new exact OT $G_2$ stiff fluid spike solution. We then present a new two-parameter family of non-OT $G_2$ stiff fluid spike solutions, obtained by the generalization of non-OT $G_2$ vacuum spike solutions to the stiff fluid case by applying Geroch's transformation on a Jacobs seed. The dynamics of these new stiff fluid spike solutions is qualitatively different from that of the vacuum spike solutions, in that the matter (stiff fluid) feels the spike directly and the stiff fluid spike solution can end up with a permanent spike. We then derive the evolution equations of non-OT $G_2$ stiff fluid models, including a second perfect fluid, in full generality, and briefly discuss some of their qualitative properties and their potential numerical analysis. Finally, we discuss how a fluid, and especially a stiff fluid or massless scalar field, affects the physics of the generation of spikes.

24 pages, 3 figures

References in corpus (6)

• Spikes in the Mixmaster regime of G_2 cosmologies
• Chasing the non-linear evolution of matter power spectrum with numerical resummation method: solution of closure equations
• New explicit spike solution -- non-local component of the generalized Mixmaster attractor
• Generating matter inhomogeneities in general relativity
• General relativistic density perturbations
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• Past instability of FLRW solutions of the Einstein-Euler-scalar field equations for linear equations of state $p=K\rho$ with $0\le K<1/3$
• Generating spiky solutions of Einstein field equations with the Stephani transformation
• Cylindrical spikes
• Holographic Principle and the Second Law in Stephani Cosmology Revisited
• Mixmaster Fluids Near the Big Bang
• Transition analysis of the non-OT $G_2$ stiff fluid spike solution
• Numerical confirmations of joint spike transitions in $G_2$ cosmologies