Boson stars in the Brans-Dicke gravitational theories

Gunderson, Michael A.; Jensen, Lars Gerhard

doi:10.1103/physrevd.48.5628

Cited by 24 publications

(47 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…There would occur an evolution of boson stars if the external gravitational constant κ changes its value with time [108][109][110][111][112]. This can be outlined within the theory of Jordan-Brans-Dicke or a more general scalar tensor theory.…”

Section: E Gravitational Evolutionmentioning

confidence: 99%

Boson stars: alternatives to primordial black holes?

2000

View full text Add to dashboard Cite

The present surge for the astrophysical relevance of boson stars stems from the speculative possibility that these compact objects could provide a considerable fraction of the non-baryonic part of dark matter within the halo of galaxies. For a very light 'universal' axion of effective string models, their total gravitational mass will be in the most likely range of ∼ 0.5 M⊙ of MACHOs. According to this framework, gravitational microlensing is indirectly "weighing" the axion mass, resulting in ∼ 10 −10 eV/c 2 . This conclusion is not changing much, if we use a dilaton type selfinteraction for the bosons. Moreover, we review their formation, rotation and stability as likely candidates of astrophysical importance.

show abstract

Section: E Gravitational Evolutionmentioning

confidence: 99%

Boson stars: alternatives to primordial black holes?

2000

View full text Add to dashboard Cite

show abstract

“…The first scalar-tensor models of boson stars were studied by Gunderson and Jensen [16], who concentrated on JBD theory with ω = 6. This was generalized by Torres [17], both to other JBD couplings and to some particular scalar-tensor theories with non-constant ω(φ) chosen to match all current observational constraints.…”

Section: Introductionmentioning

confidence: 99%

Brans - Dicke boson stars: configurations and stability through cosmic history

Torres

Schunck

Liddle

1998

Class. Quantum Grav.

View full text Add to dashboard Cite

We make a detailed study of boson star configurations in Jordan-Brans-Dicke theory, studying both equilibrium properties and stability, and considering boson stars existing at different cosmic epochs. We show that boson stars can be stable at any time of cosmic history and that equilibrium stars are denser in the past. We analyze three different proposed mass functions for boson star systems, and obtain results independently of the definition adopted. We study how the configurations depend on the value of the Jordan-Brans-Dicke coupling constant, and the properties of the stars under extreme values of the gravitational asymptotic constant. This last point allows us to extract conclusions about the stability behaviour concerning the scalar field. Finally, other dynamical variables of interest, like the radius, are also calculated. In this regard, it is shown that the radius corresponding to the maximal boson star mass remains roughly the same during cosmological evolution.PACS numbers: 04.40.Dg, 04.50.+h Sussex preprint SUSSEX-AST 98/3-5, gr-qc/9803094

show abstract

“…Within the BD gravitational framework, Gunderson and Jensen investigated the coupling of a scalar field with quartic self-interactions with the metric and the BD scalar field, φ BD , [4]. The properties of boson stars within this framework have been extensively studied in a series of papers [5,6,7].…”

Section: Introductionmentioning

confidence: 99%

“…In the present article we follow the work of [4]- [10]. Our aim is to study the formation of non-topological soliton stars in the context of BD or general scalar-tensor gravitational theory, their stability with respect to fission into free particles and to gravitational collapse, and the influence of ω BD in the star parameters.…”

Section: Introductionmentioning

confidence: 99%

Q-stars in scalar–tensor gravitational theories

Prikas

2005

Physics Letters B

View full text Add to dashboard Cite

We study q-stars in Brans-Dicke gravitational theory. We find that when the Brans-Dicke constant, ω BD , tends to infinity, the results of General Relativity are reproduced. For other values of ω BD , the particle number, mass and radius of the star and the absolute value of the matter field are a few percent larger than in the case of General Relativity. We also investigate the general scalar-tensor gravitational theory and find that the star parameters are a few percent larger than in the case of General Relativity.

show abstract

Boson stars in the Brans-Dicke gravitational theories

Cited by 24 publications

References 12 publications

Boson stars: alternatives to primordial black holes?

Boson stars: alternatives to primordial black holes?

Brans - Dicke boson stars: configurations and stability through cosmic history

Q-stars in scalar–tensor gravitational theories

Contact Info

Product

Resources

About