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Noncommutative General Relativity [PDF]

Physical Review D, 2005
We define a theory of noncommutative general relativity for canonical noncommutative spaces. We find a subclass of general coordinate transformations acting on canonical noncommutative spacetimes to be volume-preserving transformations.
A. Einstein, A. Einstein, Archil Kobakhidze, R. Jackiw, Xavier Calmet   +4 more
core   +5 more sources

Nonlocal General Relativity

Galaxies, 2014
A brief account of the present status of the recent nonlocal generalization of Einstein’s theory of gravitation is presented. The main physical assumptions that underlie this theory are described.
Bahram Mashhoon
doaj   +4 more sources

General Relativity and Philosophy [PDF]

Journal of Philosophical Investigations, 2021
Is philosophy useful for physics? Many physicists and philosophers believe that it is; but there are those who challenge the usefulness of philosophy for science. Three major objections can be identified in their reasoning: 1.
Mohammad Ebrahim Maghsoudi, Mehdi Golshani   +1 more
doaj   +1 more source

Nonlocal extension of causal thermodynamics of the isotropic cosmic fluid

Physics Letters B, 2022
We establish the nonlocal generalization of the Israel-Stewart model for the relativistic causal thermodynamics of the cosmic fluid, which evolves in the homogeneous isotropic Universe.
Alexander B. Balakin, Alexei S. Ilin
doaj   +1 more source

Interaction of the axionic dark matter, dynamic aether, spinor and gravity fields as an origin of oscillations of the fermion effective mass

European Physical Journal C: Particles and Fields, 2021
In the framework of the Einstein–Dirac-axion-aether theory we consider the quartet of self-interacting cosmic fields, which includes the dynamic aether, presented by the unit timelike vector field, the axionic dark mater, described by the pseudoscalar ...
Alexander B. Balakin, Anna O. Efremova
doaj   +1 more source

Dynamic Aether as a Trigger for Spontaneous Spinorization in Early Universe

Universe, 2023
In the framework of the Einstein–Dirac-aether theory we consider a phenomenological model of the spontaneous growth of the fermion number, which is triggered by the dynamic aether.
Alexander Balakin, Anna Efremova
doaj   +1 more source

New application of the Killing vector field formalism: modified periodic potential and two-level profiles of the axionic dark matter distribution

European Physical Journal C: Particles and Fields, 2020
We consider the structure of halos of the axionic dark matter, which surround massive relativistic objects with static spherically symmetric gravitational field and monopole-type magneto-electric fields.
Alexander B. Balakin, Dmitry E. Groshev
doaj   +1 more source

Is the Axionic Dark Matter an Equilibrium System?

Universe, 2020
We consider an axionic dark matter model with a modified periodic potential for the pseudoscalar field in the framework of the axionic extension of the Einstein-aether theory.
Alexander B. Balakin, Amir F. Shakirzyanov   +1 more
doaj   +1 more source

Numerical relativity simulation of GW150914 beyond general relativity [PDF]

, 2020
We produce the first astrophysically-relevant numerical binary black hole gravitational waveform in a higher-curvature theory of gravity beyond general relativity.
Moxon, Jordan, Okounkova, Maria, Scheel, Mark A., Stein, Leo C., Teukolsky, Saul A.   +4 more
core   +2 more sources

Coincident general relativity [PDF]

Physical Review D, 2018
5 ...
Jimenez, Jose Beltran, Heisenberg, Lavinia, Koivisto, Tomi   +2 more
openaire   +2 more sources