Scalar fields, energy conditions and traversable wormholes
نویسندگان
چکیده
منابع مشابه
Scalar fields, energy conditions and traversable wormholes
We describe the different possibilities that a simple and apparently quite harmless classical scalar field theory provides to violate the energy conditions. We demonstrate that a nonminimally coupled scalar field with a positive curvature coupling ξ > 0 can easily violate all the standard energy conditions, up to and including the averaged null energy condition (ANEC). Indeed, this violation of...
متن کامل0 Scalar fields , energy conditions , and traversable wormholes
We describe the different possibilities that a simple and apparently quite harmless classical scalar field theory provides to violate the energy conditions. We demonstrate that a non-minimally coupled scalar field with a positive curvature coupling ξ > 0 can easily violate all the standard energy conditions, up to and including the averaged null energy condition (ANEC). Indeed this violation of...
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Firstly, we review the pointwise and averaged energy conditions, the quantum inequality and the notion of the “volume integral quantifier”, which provides a measure of the “total amount” of energy condition violating matter. Secondly, we present a specific metric of a spherically symmetric traversable wormhole in the presence of a generic cosmological constant, verifying that the null and the a...
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The massless conformally coupled scalar field is characterized by the so-called ‘‘new improved stress-energy tensor’’, which is capable of classically violating the null energy condition. When coupled to Einstein gravity we find a three-parameter class of exact solutions. These exact solutions include the Schwarzschild geometry, assorted naked singularities, and a large class of traversable wor...
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It has been suggested that a possible candidate for the present accelerated expansion of the Universe is “phantom energy”. The latter possesses an equation of state of the form ω ≡ p/ρ < −1, consequently violating the null energy condition. As this is the fundamental ingredient to sustain traversable wormholes, this cosmic fluid presents us with a natural scenario for the existence of these exo...
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ژورنال
عنوان ژورنال: Classical and Quantum Gravity
سال: 2000
ISSN: 0264-9381,1361-6382
DOI: 10.1088/0264-9381/17/18/318