Results 21 to 30 of about 6,607,101 (361)

Traversable Wormholes in General Relativity. [PDF]

open access: yesPhysical Review Letters, 2021
Blázquez-Salcedo et al. [Phys. Rev. Lett. 126, 101102 (2021)PRLTAO0031-900710.1103/PhysRevLett.126.101102] obtained asymptotically flat traversable wormhole solutions in the Einstein-Dirac-Maxwell theory without using phantom matter.
R. Konoplya, A. Zhidenko
semanticscholar   +1 more source

General Relativity and Philosophy [PDF]

open access: yesJournal 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   +1 more
doaj   +1 more source

Nonlocal extension of causal thermodynamics of the isotropic cosmic fluid

open access: yesPhysics 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

Tests of General Relativity with Binary Black Holes from the second LIGO-Virgo Gravitational-Wave Transient Catalog [PDF]

open access: yes, 2020
Gravitational waves enable tests of general relativity in the highly dynamical and strong-field regime. Using events detected by LIGO-Virgo up to 1 October 2019, we evaluate the consistency of the data with predictions from the theory. We first establish
The Ligo Scientific Collaboration   +499 more
semanticscholar   +1 more source

Energy conditions in general relativity and quantum field theory [PDF]

open access: yesClassical and quantum gravity, 2020
This review summarizes the current status of the energy conditions in general relativity and quantum field theory. We provide a historical review and a summary of technical results and applications, complemented with a few new derivations and discussions.
Eleni-Alexandra Kontou, Ko Sanders
semanticscholar   +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

open access: yesEuropean 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

open access: yesUniverse, 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

open access: yesEuropean 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?

open access: yesUniverse, 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   +1 more
doaj   +1 more source

Spontaneous Color Polarization as A Modus Originis of the Dynamic Aether

open access: yesUniverse, 2020
We suggest the phenomenological model of emergence of the dynamic aether as a result of decay of the SU(N) symmetric field configuration containing the multiplet of vector fields.
Alexander Balakin, Gleb Kiselev
doaj   +1 more source

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