Results 131 to 140 of about 53,649 (250)

Darkness without dark matter and energy – generalized unimodular gravity

Physics Letters B, 2017
We suggest a Lorentz non-invariant generalization of the unimodular gravity theory, which is classically equivalent to general relativity with a locally inert (devoid of local degrees of freedom) perfect fluid having an equation of state with a constant ...
A.O. Barvinsky, A.Yu. Kamenshchik
doaj   +1 more source

LQG for the Bewildered

, 2014
We present a pedagogical introduction to the notions underlying the connection formulation of General Relativity - Loop Quantum Gravity (LQG) - with an emphasis on the physical aspects of the framework.
Bilson-Thompson, Sundance, Vaid, Deepak
core   +1 more source

Cosmic Inflation, Quantum Information and the Pioneering Role of John S Bell in Cosmology

Universe, 2019
According to the theory of cosmic inflation, the large scale structures observed in our Universe (galaxies, clusters of galaxies, Cosmic Background Microwave—CMB—anisotropy…) are of quantum mechanical origin. They are nothing but vacuum
Jérôme Martin
doaj   +1 more source

Brane-World Gravity

Living Reviews in Relativity, 2010
The observable universe could be a 1+3-surface (the “brane”) embedded in a 1+3+d-dimensional spacetime (the “bulk”), with Standard Model particles and fields trapped on the brane while gravity is free to access the bulk.
Roy Maartens, Kazuya Koyama
doaj  

On the Geometric Meaning of General Relativity and the Foundations of Newtonian Cosmology

AppliedMath
The geometric foundations of General Relativity are revisited here, with particular attention to its gauge invariance, as a key to understanding the true nature of spacetime.
Jaume de Haro, Emilio Elizalde
doaj   +1 more source

Axiomatic formulations of modified gravity theories with nonlinear dispersion relations and Finsler–Lagrange–Hamilton geometry

European Physical Journal C: Particles and Fields, 2018
We develop an axiomatic geometric approach and provide an unconventional review of modified/nonlinear gravity theories, MGTs, with modified dispersion relations, MDRs, encoding Lorentz invariance violations, LIVs, classical and quantum random effects ...
Laurenţiu Bubuianu, Sergiu I. Vacaru
doaj   +1 more source

Towards inhomogeneous loop quantum cosmology: triangulating Bianchi IX with perturbations

, 2010
This brief article sums up results obtained in arXiv:0911.2653, which develops a constrained SU(2) lattice gauge theory in the "dipole" approximation.
Marciano, Antonino
core   +1 more source

Energy-Flow Cosmology: A Thermodynamic Bridge Between General Relativity and Quantum Field

This study proposes a thermodynamic framework that unifies General Relativity (GR) and Quantum Field Theory (QFT) through a continuous energy-flow field parameterized by entropy S. The model introduces an entropy-dependent coupling and an emergent light speed, showing that both spacetime geometry and quantum fluctuations arise as limiting cases of the ...
openaire   +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

Projective Rank-Collapse Cosmology (PRCC): Deriving General Relativity and Quantum Mechanics from the Thermodynamics of Finite-Rank Manifolds

Boduen Wang
  +5 more sources