Klein-Gordon Geon

Kaup, D. J.

doi:10.1103/physrev.172.1331

Cited by 771 publications

(847 citation statements)

References 12 publications

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“…Apparently, it took astronomers over 30 years to actually detect neutron stars after they were Ðrst proposed (see Shapiro & Teukolsky 1983 for some historical notes). The Ðrst numerical studies of the boson stars were completed by Kaup (1968) and Ruffini & Bonazzola (1969). They found that the mass of boson stars is of the order of where is the Planck mass.…”

Section: Introductionmentioning

confidence: 99%

Boson Stars as Gravitational Lenses

Dąbrowski

Schunck

2000

ApJ

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We discuss boson stars as possible gravitational lenses and study the lensing e †ect of these objects made up of scalar particles. The mass and the size of a boson star may vary from an individual Newtonian object similar to the Sun to the general relativistic size and mass of a galaxy close to its Schwarzschild radius. We assume boson stars to be transparent, which allows the light to pass through them, although the light is gravitationally deÑected. We assume boson stars of mass M \ 1010 to be on M _ noncosmological distance from the observer. We discuss the lens equation for these stars as well as the details of magniÐcation. We Ðnd that there are typically three images of a star, but the deÑection angles may vary from arcseconds to even degrees. There is one tangential critical curve (Einstein ring) and one radial critical curve for tangential and radial magniÐcation, respectively. Moreover, the deÑection angles for the light passing through the gravitational Ðeld of boson stars can be very large (even of the order of degrees), which reÑects the fact that they are very strong relativistic objects. We derive a suitable formula for the lens equation for such large deÑection angles. Although the large deÑection angle images are highly demagniÐed, their existence in the area of the tangential critical curve may help with observational detection of suitable lenses possessing characteristic features of boson stars, which could also serve as a direct evidence for scalar Ðelds in the universe.

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Section: Introductionmentioning

confidence: 99%

Boson Stars as Gravitational Lenses

Dąbrowski

Schunck

2000

ApJ

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“…The study of boson stars can be traced back to the work of Kaup [11] and Ruffini and Bonazzalo [12] more than 30 years ago. They found asymptotically flat, spherically symmetric equilibrium solutions of the Einstein-Klein-Gordon equations.…”

Section: Introductionmentioning

confidence: 99%

Boson stars with negative cosmological constant

2003

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We consider boson star solutions in a D-dimensional, asymptotically anti-de Sitter spacetime and investigate the influence of the cosmological term on their properties. We find that for D > 4 the boson star properties are close to those in four dimensions with a vanishing cosmological constant. A different behavior is noticed for the solutions in the three dimensional case. We establish also the non-existence of static, spherically symmetric black holes with a harmonically time-dependent complex scalar field in any dimension greater than two.

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“…Boson Stars (BSs) are localized, regular, spherically symmetric solutions of Einstein's field equations, whose matter content is provided by a complex scalar field with mass and self-interaction [1,2,3]. Recently Boson Stars have appeared in many contexts.…”

Section: Introductionmentioning

confidence: 99%

“…In this paper I focus on numerical challenges, and set up a starting point to study the astrophysical applications mentioned before. Instead of developing the original mean field approximation to calculate the expectation value of the stress-energy tensor components of a quantum scalar field as done originally [1,2], the field is simply considered to be classical as usually done when studying the evolution of these systems.…”

Section: Introductionmentioning

confidence: 99%

Evolving spherical boson stars on a 3D Cartesian grid

Guzmán

2004

Phys. Rev. D

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A code to evolve boson stars in 3D is presented as the starting point for the evolution of scalar field systems with arbitrary symmetries. It was possible to reproduce the known results related to perturbations discovered with 1D numerical codes in the past, which include evolution of stable and unstable equilibrium configurations. In addition, the apparent and event horizons masses of a collapsing boson star are shown for the first time. The present code is expected to be useful at evolving possible sources of gravitational waves related to scalar field objects and to handle toy models of systems perturbed with scalar fields in 3D.

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Klein-Gordon Geon

Cited by 771 publications

References 12 publications

Boson Stars as Gravitational Lenses

Boson Stars as Gravitational Lenses

Boson stars with negative cosmological constant

Evolving spherical boson stars on a 3D Cartesian grid

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