scholarly journals Hawking’s radiation in non-stationary rotating de Sitter background

2011 ◽  
Vol 333 (1) ◽  
pp. 175-185 ◽  
Author(s):  
N. Ibohal ◽  
T. Ibungochouba
Keyword(s):  
De Sitter ◽  
Sitter Background

Dirac particle in electric field with confining scalar potential on (anti)-de Sitter background

2018 ◽  
Vol 33 (34) ◽  
pp. 1850202 ◽  
Author(s):  
N. Messai ◽  
B. Hamil ◽  
A. Hafdallah
Keyword(s):  
Energy Spectrum ◽  
Dirac Equation ◽  
Electric Field ◽  
Scalar Potential ◽  
Dirac Particle ◽  
Wave Functions ◽  
De Sitter ◽  
Sitter Background ◽  
Position Representation

In this paper, we study the (1 + 1)-dimensional Dirac equation in the presence of electric field and scalar linear potentials on (anti)-de Sitter background. Using the position representation, the energy spectrum and the corresponding wave functions are exactly obtained.

Quantum mechanics on (anti)-de Sitter background II: Ramsauer–Townsend effect and WKB method

2018 ◽  
Vol 33 (26) ◽  
pp. 1850150 ◽  
Author(s):  
Won Sang Chung ◽  
Hassan Hassanabadi
Keyword(s):  
Quantum Mechanics ◽  
Energy Level ◽  
Harmonic Oscillator ◽  
Wkb Method ◽  
De Sitter ◽  
Quantum Harmonic Oscillator ◽  
One Dimensional ◽  
Sitter Background ◽  
The One

Based on the one-dimensional quantum mechanics on (anti)-de Sitter background [W. S. Chung and H. Hassanabadi, Mod. Phys. Lett. A 32, 26 (2107)], we discuss the Ramsauer–Townsend effect. We also formulate the WKB method for the quantum mechanics on (anti)-de Sitter background to discuss the energy level of the quantum harmonic oscillator and quantum bouncer.

scholarly journals Stochastic particle production in a de Sitter background

2019 ◽  
Vol 2019 (05) ◽  
pp. 012-012 ◽  
Author(s):  
Marcos A.G. Garcia ◽  
Mustafa A. Amin ◽  
Scott G. Carlsten ◽  
Daniel Green
Keyword(s):  
Particle Production ◽  
De Sitter ◽  
Sitter Background ◽  
Stochastic Particle

INHOMOGENEOUS DUST COLLAPSE WITH COSMOLOGICAL CONSTANT

2005 ◽  
Vol 14 (03n04) ◽  
pp. 707-715 ◽  
Author(s):  
S. G. GHOSH
Keyword(s):  
Cosmological Constant ◽  
Gravitational Collapse ◽  
Dust Cloud ◽  
Cosmic Censorship ◽  
Space Time ◽  
De Sitter ◽  
Naked Singularities ◽  
Asymptotic Flatness ◽  
Sitter Background ◽  
Strong Curvature

We investigate the occurrence of naked singularities in the gravitational collapse of an inhomogeneous dust cloud in an expanding de Sitter background — a piece of Tolman–Bondi–de Sitter space–time. It turns out that the collapse proceed in the same way as in the Minkowski background, i.e., the strong curvature naked singularities form and thus violate the cosmic censorship conjecture. Our result unambiguously support the fact that the asymptotic flatness of space–time is not a necessary ingredient for the development of naked singularities.

scholarly journals Gravitational waves from compact sources in a de Sitter background

2016 ◽  
Vol 94 (6) ◽  
Author(s):  
Ghanashyam Date ◽  
Sk Jahanur Hoque
Keyword(s):  
Gravitational Waves ◽  
De Sitter ◽  
Sitter Background ◽  
Compact Sources

scholarly journals D= 6,N= 2,F(4)-Supergravity with supersymmetric de Sitter Background

2002 ◽  
Vol 2002 (09) ◽  
pp. 057-057 ◽  
Author(s):  
Riccardo D'Auria ◽  
Silvia Vaulà
Keyword(s):  
De Sitter ◽  
Sitter Background

scholarly journals Removing Ostrogradski’s ghost from cosmological perturbations in f(R,Rμν2,Cμνρσ2) gravity

2016 ◽  
Vol 31 (11) ◽  
pp. 1650067 ◽  
Author(s):  
Yuji Akita ◽  
Tsutomu Kobayashi
Keyword(s):  
General Formula ◽  
Ricci Tensor ◽  
Matter Density ◽  
De Sitter ◽  
Cosmological Perturbations ◽  
Text Type ◽  
Cosmological Background ◽  
Density Perturbations ◽  
Sitter Background ◽  
Theories Of Gravity

Recently, it was argued that gravity with the square of the Ricci tensor can be stabilized by adding constraints to the theory in a Lorentz violating way. This was so far demonstrated for fluctuations on the Minkowski/de Sitter background. We show that the same scheme works equally well for removing Ostrogradski’s ghost from fluctuations on a cosmological background in generic [Formula: see text]-type theories of gravity. As an application, we derive the general formula for the spectrum of primordial tensor perturbations from the stabilized theory. The evolution of matter density perturbations is also discussed.

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