Results 31 to 40 of about 52,296 (249)
Review of: "Quantum Cosmology: Cosmology directly linked to the Planck Scale in General Relativity Theory and Newton Gravity" [PDF]
Yohannes Yebabe Tesfay
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Primordial black holes in loop quantum cosmology: the effect on the threshold [PDF]
Classical and quantum gravity, 2023 Primordial black holes form in the early Universe and constitute one of the most viable candidates for dark matter. The study of their formation process requires the determination of a critical energy density perturbation threshold δc , which in general ...
T. Papanikolaou
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Observations in quantum cosmology [PDF]
Classical and quantum gravity, 2023 In this review, we focus on whether a canonical quantization of general relativity can produce testable predictions for cosmology. In particular, we examine how this approach can be used to model the evolution of primordial perturbations. This program of
Leonardo Chataignier +2 more
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Quantum cosmology in f(Q) theory [PDF]
Classical and quantum gravity, 2021 We use Dirac’s method for the quantization of constrained systems in order to quantize a spatially flat Friedmann–Lemaître–Robertson–Walker spacetime in the context of f(Q) cosmology.
N. Dimakis +2 more
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Homogeneous Barotropic String Cosmology Model of Bianchi Type IV0 in General Relativity
Journal of Nano- and Electronic Physics, 2023 The homogeneous barotropic string cosmology model has been widely investigated in the context of string theory and other quantum gravity theories. It has been shown that it leads to intriguing and non-trivial predictions for the early universe, such as ...
Sunil Kumawat, Laxmi Poonia
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Gauge-Invariant Perturbations at a Quantum Gravity Bounce
Universe, 2022 We study the dynamics of gauge-invariant scalar perturbations in cosmological scenarios with a modified Friedmann equation, such as quantum gravity bouncing cosmologies.
Steffen Gielen, Lisa Mickel
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A Rotating Model of a Light Speed Expanding Hubble-Hawking Universe
Physical Sciences Forum, 2023 Based on light speed expansion, a modified red shift formula, a scaled Hawking’s black hole temperature formula, the super gravity of galactic baryon matter and baby Planck ball, in our recent publications we have clearly established a novel model of ...
U. V. Satya Seshavatharam +1 more
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Hidden Quantum Effect in General Relativity
Journal of High Energy Physics Gravitation and Cosmology, 2023 If the Planck length is chosen as the natural length scale of the Universe, the Penrose-Carter diagram associated with the classical gravitational collapse of a thin spherical shell of massless matter reveals, beyond and in agreement with the claimed non
M. Socolovsky
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Nonsingular bouncing cosmology in general relativity: physical analysis of the spacetime defect [PDF]
Classical and quantum gravity, 2020 In this paper, we describe physical effects occurring in the regularized Robertson–Walker spacetime which can reveal the presence of the defect. Our analysis is based on two main physical quantities: the compressive forces acting on (human) observers and
E. Battista
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