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- W1854246413 abstract "There are a number of reasons to study wormholes with generic cosmological constant Λ. Recent observations indicate that the present accelerating expansion of the universe demands Λ > 0. On the other hand, some extended theories of gravitation, such as supergravity and superstring theories, possess vacuum states with Λ < 0. Even within the framework of general relativity, a negative cosmological constant permits black holes with horizons topologically different from the usual spherical ones. These solutions are convertible to wormhole solutions by adding some exotic matter. In this paper, the asymptotically flat wormhole solutions in a generic cosmological constant background are studied. By constructing a specific class of shape functions, a mass function, energy density, and pressure profile that support such a geometry are obtained. It is shown that for having such a geometry, the wormhole throat, r 0 , the cosmological constant, Λ, and the equation of state parameter, ω, should satisfy two specific conditions. The possibility of setting different values for the parameters of the model helps us to find exact solutions for the metric functions, mass functions, and energy–momentum profiles. At last, the volume integral quantifier, which provides useful information about the total amount of energy-condition violating matter, is discussed briefly." @default.
- W1854246413 created "2016-06-24" @default.
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- W1854246413 date "2015-12-01" @default.
- W1854246413 modified "2023-09-23" @default.
- W1854246413 title "Phantom wormhole solutions in a generic cosmological constant background" @default.
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- W1854246413 doi "https://doi.org/10.1139/cjp-2015-0359" @default.
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