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Inflationary Magnetogenesis with Broken Local U(1) Symmetry
Guillem Domènech, Chunshan Lin, Misao Sasaki
We point out that a successful inflationary magnetogenesis could be realised if we break the local U(1) gauge symmetry during inflation. The effective electric charge is fixed as a…
Adiabaticity and gravity theory independent conservation laws for cosmological perturbations
Antonio Enea Romano, Sander Mooij, Misao Sasaki
We carefully study the implications of adiabaticity for the behavior of cosmological perturbations. There are essentially three similar but different definitions of non-adiabaticit…
Perturbed Newtonian description of the Lemaître model with non-negligible pressure
Kazuhiro Yamamoto, Valerio Marra, Viatcheslav Mukhanov +1
We study the validity of the Newtonian description of cosmological perturbations using the Lemaitre model, an exact spherically symmetric solution of Einstein's equation. This prob…
Stationary bubbles and their tunneling channels toward trivial geometry
Pisin Chen, Guillem Domènech, Misao Sasaki +1
In the path integral approach, one has to sum over all histories that start from the same initial condition in order to obtain the final condition as a superposition of histories.…
Naked Black Hole Firewalls
Pisin Chen, Yen Chin Ong, Don N. Page +2
In the firewall proposal, it is assumed that the firewall lies near the event horizon and should not be observable except by infalling observers, who are presumably terminated at t…
A relativistic signature in large-scale structure
Nicola Bartolo, Daniele Bertacca, Marco Bruni +6
In General Relativity, the constraint equation relating metric and density perturbations is inherently nonlinear, leading to an effective non-Gaussianity in the dark matter density…
Cosmological disformal invariance
Guillem Domènech, Atsushi Naruko, Misao Sasaki
The invariance of physical observables under disformal transformations is considered. It is known that conformal transformations leave physical observables invariant. However, whet…
Resonant Primordial Gravitational Waves Amplification
Chunshan Lin, Misao Sasaki
We propose a mechanism to evade the Lyth bound in models of inflation. We minimally extend the conventional single-field inflation model in general relativity (GR) to a theory with…
Multi-disformal invariance of nonlinear primordial perturbations
Yuki Watanabe, Atsushi Naruko, Misao Sasaki
We study disformal transformations of the metric in the cosmological context. We first consider the disformal transformation generated by a scalar field and show that the curva…
A new parameter in attractor single-field inflation
Jinn-Ouk Gong, Misao Sasaki
We revisit the notion of slow-roll in the context of general single-field inflation. As a generalization of slow-roll dynamics, we consider an inflaton in an attractor phase wh…
Conformal Frame Dependence of Inflation
Guillem Domènech, Misao Sasaki
Physical equivalence between different conformal frames in scalar-tensor theory of gravity is a known fact. However, assuming that matter minimally couples to the metric of a parti…
Galaxy bias and gauges at second order in General Relativity
Daniele Bertacca, Nicola Bartolo, Marco Bruni +5
We discuss the question of gauge choice when analysing relativistic density perturbations at second order. We compare Newtonian and General Relativistic approaches. Some misconcept…