Euclidean wormholes with minimally coupled scalar fields
نویسندگان
چکیده
منابع مشابه
Charged Wormholes with Non-minimally Coupled Scalar Fields. Existence and Stability
A search for traversable wormhole solutions to the gravitational field equations with realistic matter has been for long, and is still remaining to be, one of the most intriguing challenges in gravitational studies. One of attractive features of wormholes is their ability to support electric or magnetic “charge without charge” [1] by letting the lines of force thread from one spatial asymptotic...
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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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On one hand recent cosmological observations, and particuarly the Hubble diagram for Type Ia supernovae [1] have led to the idea that the universe may be dominated by a component with negative pressure [2] and thus that today the universe is accelerating. Such a component can also, if one sticks to the prediction of inflation that Ω = 1, account for the “missing energy”. Yet, many candidates ha...
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Non-minimally coupled scalar fields have been extensively used in the literature to account for higher loop quantum corrections to the theory of scalar fields in the general relativity theory of gravitation (see, e.g., [1] and Refs. therein). However, contrary to the minimally coupled case, quantization of such fields in the framework of quantum field theories on a classical curved background m...
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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...
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ژورنال
عنوان ژورنال: Classical and Quantum Gravity
سال: 2013
ISSN: 0264-9381,1361-6382
DOI: 10.1088/0264-9381/30/17/175013