Inprocess QC for Ceramic Capacitors

Debnath, N. K.

doi:10.1080/02564602.1986.11437935

Cited by 4 publications

(4 citation statements)

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“…Another related issue is that how dark energy affects already-formed black hole is related to the fact that it was shown that the mass of a black hole decreases due to phantom energy accretion and tends to zero when the Big Rip approaches [55]- [56]. Gravitational collapse and formation of black holes in the presence of dark energy were first considered by several works [57]- [60].…”

Section: Introductionmentioning

confidence: 99%

On Anisotropic Dark Energy

2009

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Since the discovery of the accelerated expansion of the universe, it was necessary to introduce a new component of matter distribution called dark energy. The standard cosmological model considers isotropy of the pressure and assumes an equation of state p = ωρ, relating the pressure p and the energy density ρ. The interval of the parameter ω defines the kind of matter of the universe, related to the fulfillment, or not, of the energy conditions of the fluid. The recent interest in this kind of fluid with anisotropic pressure, in the scenario of the gravitational collapse and star formation, imposes a carefull analysis of the energy conditions and the role of the components of the pressure. Here, in this work, we show an example where the classification of dark energy for isotropic pressure fluids is used incorrectly for anisotropic fluids. The correct classification and its consequences are presented. * Electronic address: chan@on.br † Electronic address: mfasnic@gmail.com ‡ Electronic address: jaime@mast.br

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Section: Introductionmentioning

confidence: 99%

On Anisotropic Dark Energy

2009

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“…Due to its this effectiveness, several generalizations of CG are proposed (see e.g. [40,41,42,43,44,45,46,47]). The Chaplygin gas arises from the dynamics of a generalized d-brane in a (d + 1, 1) spacetime and can be described by a complex scalar field whose action can be written as a generalized Born-Infeld action [48].…”

Section: Introductionmentioning

confidence: 99%

Cosmic-coincidence problem and variable constants of physics

Jamil

Rahaman

Kalam³

2009

Eur. Phys. J. C

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The standard model of cosmology is investigated using time-dependent cosmological constant Λ and Newton gravitational constant G. The total energy content is described by the modified Chaplygin gas equation of state. It is found that the time-dependent constants coupled with the modified Chaplygin gas interpolate between the earlier matter to the later dark energy dominated phase of the universe. We also achieve a convergence of the parameter ω → −1, almost at the present time. Thus our model fairly alleviates the cosmic-coincidence problem which demands ω = −1 at the present time.

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“…Much of the work on black hole formation deals with pressureless dust collapse; collapse of this kind of exotic fluid to black holes so far has not received much treatment. Recent work [19] involved investigation of spherically symmetric clouds of a collapsing modified Chaplygin gas in four dimensions, where it was shown that it always leads to the formation of a black hole.…”

Section: Introductionmentioning

confidence: 99%

Gravitationally collapsing shells in(2+1)dimensions

Mann

2006

Phys. Rev. D

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We study gravitationally collapsing models of pressureless dust, fluids with pressure, and the generalized Chaplygin gas (GCG) shell in (2+1)-dimensional spacetimes. Various collapse scenarios are investigated under a variety of the background configurations such as anti-de Sitter(AdS) black hole, de Sitter (dS) space, flat and AdS space with a conical deficit. As with the case of a disk of dust, we find that the collapse of a dust shell coincides with the Oppenheimer-Snyder type collapse to a black hole provided the initial density is sufficiently large. We also find -for all types of shell -that collapse to a naked singularity is possible under a broad variety of initial conditions. For shells with pressure this singularity can occur for a finite radius of the shell. We also find that GCG shells exhibit diverse collapse scenarios, which can be easily demonstrated by an effective potential analysis.

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Inprocess QC for Ceramic Capacitors

Cited by 4 publications

References 0 publications

On Anisotropic Dark Energy

On Anisotropic Dark Energy

Cosmic-coincidence problem and variable constants of physics

Gravitationally collapsing shells in(2+1)dimensions

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