Results 141 to 150 of about 2,756,107 (244)

Semiclassical Length Measure from a Quantum-Gravity Wave Function

Technologies, 2017
The definition of a length operator in quantum cosmology is usually influenced by a quantum theory for gravity considered. The semiclassical limit at the Planck age must meet the requirements implied in present observations.
Orchidea Maria Lecian
doaj   +1 more source

The Quantum Chromodynamics Gas Density Drop and the General Theory of Relativity Ether

Journal of High Energy Physics Gravitation and Cosmology, 2023
Rami Rom
semanticscholar   +1 more source

Quantum-theoretical description of the cosmological constant as the zero-point energy [PDF]

arXiv, 2007
The present paper seeks to construct a quantum theory of the cosmological constant in which its presently observed very small value emerges naturally.
arxiv  

Note on Quantum Newtonian Cosmology [PDF]

arXiv, 2005
It is well known that, for pressureless matter, Newtonian and relativistic cosmologies are equivalent. We show that this equivalence breaks down in the quantum level. In addition, we find some cases for which quantum Newtonian cosmology can be related to quantum cosmology in (2+1) dimensions.
arxiv  

Supersymmetry, Cosmological Constant and Inflation: Towards a fundamental cosmic picture via “running vacuum”

EPJ Web of Conferences, 2016
On the occasion of a century from the proposal of General relativity by Einstein, I attempt to tackle some open issues in modern cosmology, via a toy but non-trivial model.
Mavromatos Nick E.
doaj   +1 more source

Power-series dynamics equation of fields based on geometric algebra and high-order covariant-derivative schemes

AIP Advances
Based on previous work, we explore in the context of quantum field theory and cosmology a geometric algebra (GA)-based approach to field dynamics through a multi-derivative power-series equation.
R. W. Haase
doaj   +1 more source

Quantum Field Theory of Black Hole Perturbations with Backreaction: I General Framework

Universe
In a seminal work, Hawking showed that natural states for free quantum matter fields on classical spacetimes that solve the spherically symmetric vacuum Einstein equations are KMS states of non-vanishing temperature.
Thomas Thiemann
doaj   +1 more source

Quantum Effects on Cosmic Scales as an Alternative to Dark Matter and Dark Energy

Universe
The spin-torsion theory is a gauge theory approach to gravity that expands upon Einstein’s general relativity (GR) by incorporating the spin of microparticles. In this study, we further develop the spin-torsion theory to examine spherically symmetric and
Da-Ming Chen, Lin Wang
doaj   +1 more source

Unitary evolution and cosmic acceleration in Loop Quantum Cosmology

Physics Letters B
Loop quantum cosmology was shown to interpolate between de Sitter and FLRW Universe phases through a bounce by including Euclidean and Lorentzian terms of the Hamiltonian constraint with weight one -that corresponding to classical General Relativity ...
Omar Gallegos, Tonatiuh Matos, Hugo A. Morales-Técotl   +2 more
doaj  

Det kosmologiska valet. Om Gud, big bang och universums existentiella mysterium

Svensk Teologisk Kvartalskrift, 2013
One of the premises of the so-called Kalām Cosmological Argument is that the universe began to exist. Modem Big Bang cosmology may seem to provide remarkable support for this hypothesis, since it estimates the universe to be 13.7 billion years old.
Martin Lembke
doaj