منابع مشابه
Troubles for Unimodular Gravity
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 ...
متن کاملNo conformal anomaly in unimodular gravity
The conformal invariance of unimodular gravity survives quantum corrections, even in the presence of conformal matter. Unimodular gravity can actually be understood as a certain truncation of the full Einstein-Hilbert theory, where in the Einstein frame the metric tensor has unit determinant. Our result is compatible with the idea that the corresponding restriction in the functional integral is...
متن کاملQuantum Gravity on Computers
Some times Thomas Hardy has been compared to Dostoevski, but Dostoevski is an incomparably ner artist. If Dostoevski's works could be compared to some of say, Rubens' paintings, then Hardy's are neatly nished diagrams drawn on graph paper with ruler and compass! Compare for instance the tragedy to Tess with that of Sonia, or the culmination of the forces in Raskolnikoo's confession with the mel...
متن کاملQuantum Gravity on dS3
We study quantum gravity on dS3 using the Chern-Simons formulation of threedimensional gravity. We derive an exact expression for the partition function for quantum gravity on dS3 in a Euclidean path integral approach. We show that the topology of the space relevant for studying de Sitter entropy is a solid torus. The quantum fluctuations of de Sitter space are sectors of configurations of poin...
متن کاملThe 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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ژورنال
عنوان ژورنال: Classical and Quantum Gravity
سال: 2013
ISSN: 0264-9381,1361-6382
DOI: 10.1088/0264-9381/30/11/115016