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- Universidad Autónoma de MadridES142 papers
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5 papers · 2 filters
Relative Entropy in de Sitter is a Noether Charge
Markus Fröb, Albert Much, Kyriakos Papadopoulos
We compute the relative entropy between the vacuum and a coherent state for a massive scalar field in de Sitter spacetime, using Tomita-Takesaki modular theory and the Araki-Uhlman…
Constraining quantum fluctuations of spacetime foam from BBN
Saurya Das, Gaetano Lambiase, Elias C. Vagenas
A possibility to describe quantum gravitational fluctuations of the spacetime background is provided by virtual -branes. These effects may induce a tiny violation of the Lorentz…
Non-commutative Geometry from Perturbative Quantum Gravity in de Sitter spacetime
Markus Fröb, William C. C. Lima, Albert Much +1
We show that a non-commutative structure arises naturally from perturbative quantum gravity in a de Sitter background metric. Our work builds on recent advances in the construction…
Non-commutative coordinates from quantum gravity
Markus B. Fröb, Albert Much, Kyriakos Papadopoulos
Local observables in (perturbative) quantum gravity are notoriously hard to define, since the gauge symmetry of gravity -- diffeomorphisms -- moves points on the manifold. In parti…
Quasinormal Modes in Noncommutative Schwarzschild black holes
Y. Zhao, Yifu Cai, S. Das +3
We investigate the quasinormal modes of a massless scalar field in a Schwarzschild black hole, which is deformed due to noncommutative corrections. We introduce the deformed Schwar…