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15 papers · 2 filters
Inflation with a Weyl term, or ghosts at work
Nathalie Deruelle, Misao Sasaki, Yuuiti Sendouda +1
In order to assess the role of ghosts in cosmology, we study the evolution of linear cosmological perturbations during inflation when a Weyl term is added to the action. Our main r…
Can Hamiltonians be boundary observables in Parametrized Field Theories?
Tomas Andrade, Donald Marolf, Cedric Deffayet
It has been argued that holography in gravitational theories is related to the existence of a particularly useful Gauss Law that allows energy to be measured at the boundary. The p…
Statistical Properties of Cosmological Billiards
Thibault Damour, Orchidea Maria Lecian
Belinski, Khalatnikov and Lifshitz (BKL) pioneered the study of the statistical properties of the never-ending oscillatory behavior (among successive Kasner epochs) of the geometry…
Infrared behavior and gauge artifacts in de Sitter spacetime: The photon field
Ahmed Youssef
We study the infrared (long distance) behavior of the free photon field in de Sitter spacetime. Using a two-parameter family of gauge fixing terms, we show that the infrared (IR) b…
Thermodynamics of magnetized binary compact objects
Koji Uryu, Eric Gourgoulhon, Charalampos Markakis
Binary systems of compact objects with electromagnetic field are modeled by helically symmetric Einstein-Maxwell spacetimes with charged and magnetized perfect fluids. Previously d…
Mode coupling of Schwarzschild perturbations: Ringdown frequencies
Enrique Pazos, David Brizuela, Jose M. Martin-Garcia +1
Within linearized perturbation theory, black holes decay to their final stationary state through the well-known spectrum of quasinormal modes. Here we numerically study whether non…