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Particle production in models with helicity-0 graviton ghost in de Sitter spacetime
Keisuke Izumi, Takahiro Tanaka
We revisit the problem of the helicity-0 ghost mode of massive graviton in the de Sitter background. In general, the presence of a ghost particle, which has negative energy, drives…
Efficient diagrammatic computation method for higher order correlation functions of local type primordial curvature perturbations
Shuichiro Yokoyama, Teruaki Suyama, Takahiro Tanaka
We present a new efficient method for computing the non-linearity parameters of the higher order correlation functions of local type curvature perturbations in inflation models hav…
Spin Polarization Effects in Micro Black Hole Evaporation
Antonino Flachi, Misao Sasaki, Takahiro Tanaka
We consider the evaporation of rotating micro black holes produced in highly energetic particle collisions, taking into account the polarization due to the coupling between the spi…
Primordial perturbations and non-Gaussianities in DBI and general multi-field inflation
David Langlois, Sebastien Renaux-Petel, Daniele A. Steer +1
We study cosmological perturbations in general inflation models with multiple scalar fields and arbitrary kinetic terms, with special emphasis on the multi-field extension of Dirac…
Primordial fluctuations and non-Gaussianities in multi-field DBI inflation
David Langlois, Sebastien Renaux-Petel, Daniele A. Steer +1
We study Dirac-Born-Infeld (DBI) inflation models with multiple scalar fields. We show that the adiabatic and entropy modes propagate with a common effective sound speed and are th…
Vacuum polarization in asymptotically anti-de Sitter black hole geometries
Antonino Flachi, Takahiro Tanaka
We study the polarization of the vacuum for a scalar field, , on an asymptotically anti-de Sitter black hole geometry. The method we follow uses the WKB analytic expansion…