CYLINDRICAL THIN-SHELL WORMHOLES AND ENERGY CONDITIONS
نویسندگان
چکیده
منابع مشابه
Dynamical Wormholes and Energy Conditions
A class of exact solutions of the Einstein field equations representing non-static wormholes that obey the weak and dominant energy conditions is presented. Hence, in principle, these wormholes can be built with less exotic matter than the static ones. PACS numbers: 04.20.Jb, 04.20.Cv, 04.60.+n, 03.70.+k e-mail address: [email protected] e-mail address: [email protected] 1 The idea of wormholes ...
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It is shown that the existence of static, cylindrically symmetric wormholes does not require violation of the weak or null energy conditions near the throat, and cylindrically symmetric wormhole geometries can appear with less exotic sources than wormholes whose throats have a spherical topology. Examples of exact wormhole solutions are given with scalar, spinor and electromagnetic fields as so...
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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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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 کاملOnce again on thin-shell wormholes in scalar-tensor gravity
It has been recently proved in a general form [1] that no wormholes can be formed in any scalartensor theory (STT) of gravity in which the non-minimal coupling function f(Φ) is everywhere positive and the scalar field Φ itself is not a ghost if matter sources of gravity respect the Null Energy Condition (NEC). In order to construct any viable and stable wormhole solution, attempts have been rec...
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ژورنال
عنوان ژورنال: International Journal of Modern Physics D
سال: 2012
ISSN: 0218-2718,1793-6594
DOI: 10.1142/s0218271812500150