The Minkowski vacuum state is expressed as an entangled between the left and right Rindler wedges when it constructed on vacuum. In this paper, we further examine entanglement structure extend expression to future (expanding) past (shrinking) Kasner spacetimes. This clarifies origin of quantum radiation produced by Unruh-DeWitt detector in uniformly accelerated motion four-dimensional spacetime. We also investigate two-dimensional massless case where vanishes but same exists.

A bstract We investigate a vacuum decay around spinning seed black hole by using the Israel junction condition and conclude that spin of would suppress rate compared to for non-spinning case, provided surface bubble has its ellipsoidal shape characterized Kerr geometry. also find out in existence near-extremal hole, false state can be more stabilized than case Coleman-de Luccia solution. few necessary assumptions carry calculations are discussed.

A bstract The emergence of a four-dimensional de Sitter (dS 4 ) universe on an expanding bubble in the five-dimensional anti-de (AdS 5 background has been suggested as possible cosmological scenario. It is motivated by difficulties realization stable vacua string theory. can be nucleated meta-stable pure AdS spacetime, but it known that spacetime non-perturbatively unstable. means idealized situation, and realistic situations, non-linear perturbations may lead to formation black holes due...

We study the relations of positive frequency mode functions Dirac field in 4-dimensional Minkowski spacetime covered with Rindler and Kasner coordinates, describe explicit form vacuum state quantum states regions, analytically continue solutions. As a result, we obtain correspondence region unified manner which derives entanglement.

Anisotropic inflation is a model that succeeded in explaining statistical anisotropy. Warm providing mechanism of reheating during inflation. We study anisotropic warm focusing on the cosmic no-hair conjecture. In inflation, condition for making anisotropy survive clarified. By assuming constant value dissipation ratio, we find exact solutions power-law and investigate phase space structure general solutions. It turns out whether survives or not depends competition potential drives against...

It is believed that relic gravitons are squeezed during inflation. If so, quantum noise induced by them can be significantly enhanced in current interferometers. However, decoherence of the cosmic history may change degree squeezing. As a first step for analyzing gravitons, we assume presence sizable magnetic field at beginning inflation and study conversion processes into photons case minimal coupling between photons. We solve dynamical evolution coupled system perturbatively obtain...

Quantum entanglement of the Minkowski vacuum state between left and right Rindler wedges generates thermal behavior in wedge, which is known as Unruh effect. In this paper, we show that there another consequence entanglement, namely entanglement-induced quantum radiation emanating from a uniformly accelerated object. We clarify why it agreement with our intuition incoming outgoing energy fluxes should cancel each other out thermalized state.

We numerically explore the structure of quasi-normal (QN) frequencies five-dimensional small and large Kerr-anti de Sitter (Kerr-AdS${}_5$) black hole with equal unequal rotations. Our investigation also covers low high Hawking temperatures. then study stability Kerr-AdS${}_5$ highly damped QN modes, which would reflect thermodynamic property hole. find that complex a nearly maximally spinning have periodic separation surface gravity at horizon in imaginary part while real converges to...

There exist observational evidence to believe the existence of primordial magnetic fields generated during inflation. We study gravitational waves (PGWs) inflation in presence sustained by a gauge kinetic coupling. In model, not only gravitons as excitations PGWs, but also photons electromagnetic are highly squeezed. They become entangled with each other through graviton photon conversion and vice versa. derive reduced density matrix for calculate their entanglement entropy. It turns out...

In this paper, we study the relativistic effect on wave functions for a bouncing particle in gravitational field. Motivated by equivalence principle, investigate Klein–Gordon and Dirac equations Rindler coordinates with boundary conditions mimicking uniformly accelerated mirror Minkowski space. nonrelativistic limit, all these models comoving frame reduce to familiar eigenvalue problem Schrödinger equation fixed floor linear potential, as expected. We find that transition frequency between...

We present the Big-Bang Nucleosynthesis (BBN) simulation with a bubble universe scenario around rotating black hole (BH) in Kerr-AdS$_5$ spacetime to explain recently updated observations of light elements such as primordial helium abundance. In this scenario, geometry 4D- early Universe is described vacuum that undergoes quasi-de Sitter expansion Kerr- AdS$_5$ spacetime. find BH mass and spin parameter, which show an anti-correlation against total radiation, are important resolve ${}^4$He...

Abstract Dark gauge fields have been discussed as candidates for dark matter recently. If they existed, primordial magnetic during inflation would existed. It is believed that gravitational waves (PGWs) arise out of quantum fluctuations inflation. We study the graviton-dark photon conversion process in presence background and find induces tachyonic instability PGWs. As a consequence, peak appears power spectrum turns height depends on direction observation. The frequency could be range from...

In this paper, the radiant heat transfer from luminous flame is treated theoretically and experimentally, view point that radiation cloud of carbon particles most effective. But, combustion reaction may determine distribution not considered. Then, in case where only under uniform temperature particle contents concerned with radiation, relation between total emissivity x has been found, function contents, thickness flame. And calculated value agrees Schack's result. Next, flame, x, εq...

Dark gauge fields have been discussed as candidates for dark matter recently. If they existed, primordial magnetic during inflation would existed. It is believed that gravitational waves (PGWs) arise out of quantum fluctuations inflation. We study the graviton-dark photon conversion process in presence background and find induces tachyonic instability PGWs. As a consequence, peak appears power spectrum turns height depends on direction observation. The frequency could be range from $10^{-5}$...

Modelling the Galactic chemical evolution (GCE) of short-lived radioisotopes (SLRs, with half-lives order million years) can provide timing information on recent nucleosynthesis. The knowledge their spatial distribution throughout interstellar medium (ISM) is crucial. We are using a three-dimensional GCE model to investigate four SLRs: \(^{53}\)Mn from supernovae type Ia (SNeIa), \(^{60}\)Fe core-collapse (CCSNe), \(^{182}\)Hf stellar winds intermediate mass stars (IMSs), and \(^{244}\)Pu...

In this paper, the radiant heat transfer from a luminous flame is treated theoretically and experimentally, view point that radiation cloud of carbon particles most effective. case where only under uniform temperature volume fraction concerned with radiation, relation between total emissivity X has been found, function fraction, thickness flame. And calculated value agrees well Schack's results. Next, in flame, X, found. Moreover, experimentally which was formed artificially by inserting...

It is believed that relic gravitons are squeezed during inflation. If so, quantum noise induced by them can be significantly enhanced in current interferometers. However, decoherence of the cosmic history may change degree squeezing. As a first step for analyzing gravitons, we assume presence sizable magnetic field at beginning inflation and study conversion processes into photons case minimal coupling between photons. We solve dynamical evolution coupled system perturbatively obtain...

The emergence of a four-dimensional de Sitter (dS${}_4$) universe on an expanding bubble in the five-dimensional anti-de (AdS${}_5$) background has been suggested as possible cosmological scenario. It is motivated by difficulties realization stable vacua string theory. can be nucleated meta-stable pure AdS${}_5$ spacetime, but it known that AdS spacetime non-perturbatively unstable. means idealized situation, and realistic situations, non-linear perturbations may lead to formation black...