Charged scalar-tensor boson stars: Equilibrium, stability, and evolution

We study charged boson stars in scalar-tensor (ST) gravitational theories. We analyze the weak field limit of the solutions and analytically show that there is a maximum charge to mass ratio for the bosons above which the weak field solutions are not stable. This charge limit can be greater than the...

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Detalles Bibliográficos
Autores principales: Whinnett, A. W., Torres, Diego F.
Formato: Articulo Preprint
Lenguaje:Inglés
Publicado: 1999
Materias:
Física
Scalar field
Physics
Gravitation
Scalar boson
Stars
Charge (physics)
Neutron star
Quantum electrodynamics
Theoretical physics
Scalar (physics)
Boson
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/123163
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-123163
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Física
Scalar field
Physics
Gravitation
Scalar boson
Stars
Charge (physics)
Neutron star
Quantum electrodynamics
Theoretical physics
Scalar (physics)
Boson
spellingShingle Física
Scalar field
Physics
Gravitation
Scalar boson
Stars
Charge (physics)
Neutron star
Quantum electrodynamics
Theoretical physics
Scalar (physics)
Boson
Whinnett, A. W.
Torres, Diego F.
Charged scalar-tensor boson stars: Equilibrium, stability, and evolution
topic_facet Física
Scalar field
Physics
Gravitation
Scalar boson
Stars
Charge (physics)
Neutron star
Quantum electrodynamics
Theoretical physics
Scalar (physics)
Boson
description We study charged boson stars in scalar-tensor (ST) gravitational theories. We analyze the weak field limit of the solutions and analytically show that there is a maximum charge to mass ratio for the bosons above which the weak field solutions are not stable. This charge limit can be greater than the GR limit for a wide class of ST theories. We numerically investigate strong field solutions in both the Brans-Dicke and power law ST theories. We find that the charge limit decreases with increasing central boson density. We discuss the gravitational evolution of charged and uncharged boson stars in a cosmological setting and show how, at any point in its evolution, the physical properties of the star may be calculated by a rescaling of a solution whose asymptotic value of the scalar field is equal to its initial asymptotic value. We focus on evolution in which the particle number of the star is conserved and we find that the energy and central density of the star decrease as the cosmological time increases. We also analyze the appearance of the scalarization phenomenon recently discovered for neutron stars configurations and, finally, we give a short discussion on how making the correct choice of mass influences the argument over which conformal frame, the Einstein frame or the Jordan frame, is physical.
format Articulo
Preprint
author Whinnett, A. W.
Torres, Diego F.
author_facet Whinnett, A. W.
Torres, Diego F.
author_sort Whinnett, A. W.
title Charged scalar-tensor boson stars: Equilibrium, stability, and evolution
title_short Charged scalar-tensor boson stars: Equilibrium, stability, and evolution
title_full Charged scalar-tensor boson stars: Equilibrium, stability, and evolution
title_fullStr Charged scalar-tensor boson stars: Equilibrium, stability, and evolution
title_full_unstemmed Charged scalar-tensor boson stars: Equilibrium, stability, and evolution
title_sort charged scalar-tensor boson stars: equilibrium, stability, and evolution
publishDate 1999
url http://sedici.unlp.edu.ar/handle/10915/123163
work_keys_str_mv AT whinnettaw chargedscalartensorbosonstarsequilibriumstabilityandevolution
AT torresdiegof chargedscalartensorbosonstarsequilibriumstabilityandevolution
bdutipo_str Repositorios
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