Stability of flat space to singular instantons
نویسندگان
چکیده
منابع مشابه
Stability of Flat Space to Singular Instantons
Hawking and the author have proposed a class of singular, finite action instantons for defining the initial conditions for inflation. Vilenkin has argued they are unacceptable. He exhibited an analogous class of asymptotically flat instantons which on the face of it lead to an instability of Minkowski space. However, all these instantons must be defined by introducing a constraint into the path...
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The singularity present in cosmological instantons of the Hawking-Turok type is resolved by a conformal transformation, where the conformal factor has a linear zero of codimension one. We show that if the underlying regular manifold is taken to have the topology of RP 4, and the conformal factor is taken to be a twisted field so that the zero is enforced, then one obtains a genuine saddle point...
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Flat space is shown to be perturbatively stable, to first order in A, against quantum Auctuations produced in semiclassical {or 1/N expansion) approximations to quantum gravity, despite past indications to the contrary. It is pointed out that most of the new "solutions" allowed by the semiclassical corrections do not fall within the perturbative framework, unlike the effective action and field ...
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ژورنال
عنوان ژورنال: Physics Letters B
سال: 1999
ISSN: 0370-2693
DOI: 10.1016/s0370-2693(99)00587-0