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Kinetic Screening in Nonlinear Stellar Oscillations and Gravitational Collapse by Bezares, Miguel; ter Haar, Lotte; Crisostomi, Marco; Barausse, Enrico; Palenzuela, Carlos is a scholarly article available to read on EtoBox.

What is Kinetic Screening in Nonlinear Stellar Oscillations and Gravitational Collapse about?

We consider k-essence, a scalar-tensor theory with first-order derivative self-interactions that can screen local scales from scalar fifth forces, while allowing for sizeable deviations from General Relativity on cosmological scales. We construct fully nonlinear static stellar solutions that show the presence of this screening mechanism, and we use them as initial data for simulations of stellar oscillations and gravitational collapse in spherical symmetry. We find that for k-essence theories of relevance for cosmology, the screening mechanism works in the case of stellar oscillation and suppresses the monopole scalar emission to undetectable levels. In collapsing stars, we find that the Cauchy problem, although locally well posed, can lead to diverging characteristic speeds for the scalar field. By introducing a ''fixing equation'' in the spirit of J. Cayuso, N. Ortiz, and L. Lehner [Phys. Rev. D 96, 084043 (2017)], inspired in turn by dissipative relativistic hydrodynamics, we manage to evolve collapsing neutron stars past the divergence of the characteristic speeds. We show that, in these systems, the screening mechanism is less efficient than for oscillating and static stars, b

Author

Bezares, Miguel; ter Haar, Lotte; Crisostomi, Marco; Barausse, Enrico; Palenzuela, Carlos

Published

2021

Language

EN