BRST Quantization of Unimodular Gravity
نویسندگان
چکیده
منابع مشابه
The quantization of unimodular gravity and the cosmological constant problems
A quantization of unimodular gravity is described, which results in a quantum effective action which is also unimodular, ie a function of a metric with fixed determinant. A consequence is that contributions to the energy momentum tensor of the form of gabC , where C is a spacetime constant, whether classical or quantum, are not sources of curvature in the equations of motion derived from the qu...
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We discuss the quantization of pure string–inspired dilaton–gravity in (1+1)– dimensions, and of the same theory coupled to scalar matter. We perform the quantization using the functional Schrödinger and BRST formalisms. We find, both for pure gravity and the matter–coupled theory, that the two quantization procedures give inequivalent “physical” results. BU-HEP 96-17 MIT-CTP-2544 July, 1996 ∗T...
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We compute the contribution of various gravitational instantons to the path integral in the standard formulation of unimodular gravity, an alternative theory of gravity where the determinant of the metric is not dynamical. Following similar computations in General Relativity, we derive the entropy/area ratio for cosmological and black hole horizons, finding in general disagreement with General ...
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We present the BRST cohomologies of a class of constraint (super) Lie algebras as detour complexes. By giving physical interpretations to the components of detour complexes as gauge invariances, Bianchi identities and equations of motion we obtain a large class of new gauge theories. The pivotal new machinery is a treatment of the ghost Hilbert space designed to manifest the detour structure. A...
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Most of the known models describing the fundamental interactions have a gauge freedom. In the standard path integral, it is necessary to “fix the gauge” in order to avoid integrating over unphysical degrees of freedom. Gauge independence might then become a tricky issue, especially when the structure of the gauge symmetries is intricate. In the modern approach to this question, it is BRST invar...
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ژورنال
عنوان ژورنال: Brazilian Journal of Physics
سال: 2017
ISSN: 0103-9733,1678-4448
DOI: 10.1007/s13538-017-0500-5