Wormholes in Spacetimes With Cosmological Horizons

Barceló, Carlos

doi:10.1142/s0218271899000249

Cited by 5 publications

(2 citation statements)

References 15 publications

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“…in agreement with the results obtained in Ref. [15] for an analogous system. So, both growing and decaying background terms are present in the expression of Ψ ii (a, f n ) under the barrier V (a).…”

Section: B Tunneling Boundary Conditions Of the Universesupporting

confidence: 93%

Quantum behavior of FRW radiation-filled universes

2002

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We study the quantum vacuum fluctuations around closed Friedmann-Robertson-Walker ͑FRW͒ radiationfilled universes with a nonvanishing cosmological constant. These vacuum fluctuations are represented by a conformally coupled massive scalar field and are treated in the lowest order of perturbation theory. In the semiclassical approximation, the perturbations are governed by differential equations which, properly linearized, become generalized Lamé equations. The wave function thus obtained must satisfy appropriate regularity conditions which ensure its finiteness for every field configuration. We apply these results to asymptotically anti-de Sitter Euclidean wormhole spacetimes and show that there is no catastrophic particle creation in the Euclidean region, which would lead to divergences of the wave function.

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Section: B Tunneling Boundary Conditions Of the Universesupporting

confidence: 93%

Quantum behavior of FRW radiation-filled universes

2002

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“…Similarly there was a solution for the connection of two copies of Schwarzschild-de Sitter type wormhole as the cosmological wormhole model [13]. There was a research on quantum cosmological approach by considering wave function of the de Sitter cosmological model with a wormhole [14]. Recently there was a cosmological wormhole solution [15] as a generalization of MT wormhole in FLRW universe, but there was a weak point that Einstein's equation could not be guaranteed.…”

Section: And Jacques Obtained a Generalizedmentioning

confidence: 99%

The cosmological model with a wormhole and Hawking temperature near apparent horizon

Kim

2018

Physics Letters B

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In this paper, a cosmological model with an isotropic form of the Morris-Thorne type wormhole was derived in a similar way to the McVittie solution to the black hole in the expanding universe.By solving Einstein's field equation with plausible matter distribution, we found the exact solution of the wormhole embedded in Friedmann-Lemaître-Robertson-Walker universe. We also found the apparent cosmological horizons from the redefined metric and analyzed the geometric natures, including causal and dynamic structures. The Hawking temperature for thermal radiation was obtained by the WKB approximation using the Hamilton-Jacobi equation and Hamilton's equation, near the apparent cosmological horizon. *

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Intra-Galactic Thin Shell Wormhole and Its Stability

Bochicchio

Laserra

2013

Int J Theor Phys

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In this paper, we construct an intra-galactic thin shell wormhole joining two copies of identical galactic space times described by the Mannheim-Kazanas de Sitter solution in conformal gravity and study its stability under spherical perturbations. We assume the thin shell material as a Chaplygin gas and discuss in detail the values of the relevant parameters under which the wormhole is stable. We study the stability following the method by Eiroa and we also qualitatively analyze the dynamics through the method of Weierstrass. We find that the wormhole is generally unstable but there is a small interval in radius for which the wormhole is stable.

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Wormholes in Spacetimes With Cosmological Horizons

Cited by 5 publications

References 15 publications

Quantum behavior of FRW radiation-filled universes

Quantum behavior of FRW radiation-filled universes

The cosmological model with a wormhole and Hawking temperature near apparent horizon

Intra-Galactic Thin Shell Wormhole and Its Stability

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