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Vacuum State of the Dirac Field in de Sitter Space and Entanglement Entropy
Sugumi Kanno, Misao Sasaki, Takahiro Tanaka
We compute the entanglement entropy of a free massive Dirac field between two causally disconnected open charts in de Sitter space. We first derive the Bunch-Davies vacuum mode fun…
Strongly scale-dependent CMB dipolar asymmetry from super-curvature fluctuations
Christian Byrnes, Guillem Domènech, Misao Sasaki +1
We reconsider the observed CMB dipolar asymmetry in the context of open inflation, where a supercurvature mode might survive the bubble nucleation. If such a supercurvature mode mo…
Hamiltonian Analysis of an On-shell U(1) Gauge Field Theory
Chunshan Lin, Misao Sasaki
We perform the Hamiltonian analysis of an on-shell U(1) gauge field theory, in which the action is not invariant under local U(1) transformations but recovers the invariance when t…
Global adiabaticity and non-Gaussianity consistency condition
Antonio Enea Romano, Sander Mooij, Misao Sasaki
In the context of single-field inflation, the conservation of the curvature perturbation on comoving slices, , on super-horizon scales is one of the assumptions necessary to…
Consistency relation and inflaton field redefinition in the delta N formalism
Guillem Domenech, Jinn-Ouk Gong, Misao Sasaki
We compute for general single-field inflation the intrinsic non-Gaussianity due to the self-interactions of the inflaton field in the squeezed limit. We recover the consistency rel…
Primordial Black Hole Scenario for the Gravitational-Wave Event GW150914
Misao Sasaki, Teruaki Suyama, Takahiro Tanaka +1
We point out that the gravitational-wave event GW150914 observed by the LIGO detectors can be explained by the coalescence of primordial black holes (PBHs). It is found that the ex…
Stationary bubbles: information loss paradox?
Guillem Domènech, Misao Sasaki
The main purpose of this work is to build classically stationary bubbles, within the thin-shell formalism, which are unstable under quantum effects; they either collapse into a bla…
Conformal frames in cosmology
Guillem Domènech, Misao Sasaki
From higher dimensional theories, e.g. string theory, one expects the presence of non-minimally coupled scalar fields. We review the notion of conformal frames in cosmology and emp…
Acausality in Nonlocal Gravity Theory
Ying-li Zhang, Kazuya Koyama, Misao Sasaki +1
We investigate the nonlocal gravity theory by deriving nonlocal equations of motion using the traditional variation principle in a homogeneous background. We focus on a class of mo…