6533b836fe1ef96bd12a136d
RESEARCH PRODUCT
On gravitational waves in Born-Infeld inspired non-singular cosmologies
Gonzalo J. OlmoLavinia HeisenbergDiego Rubiera-garciaJose Beltrán JiménezJose Beltrán Jiménezsubject
High Energy Physics - Theorycosmological modelCosmology and Nongalactic Astrophysics (astro-ph.CO)[ PHYS.ASTR ] Physics [physics]/Astrophysics [astro-ph]FOS: Physical sciencesGeneral Relativity and Quantum Cosmology (gr-qc)01 natural sciencesGeneral Relativity and Quantum Cosmology[ PHYS.HTHE ] Physics [physics]/High Energy Physics - Theory [hep-th][ PHYS.GRQC ] Physics [physics]/General Relativity and Quantum Cosmology [gr-qc]GravitationTheoretical physicsGeneral Relativity and Quantum CosmologyBorn–Infeld modelgravitational radiation: propagation0103 physical sciencesMinkowski spacestrong couplingphysics of the early universeMinkowski010306 general physicsAdiabatic processmodified gravityPhysics010308 nuclear & particles physicsGravitational waveNon singular[PHYS.HTHE]Physics [physics]/High Energy Physics - Theory [hep-th]Astronomy and Astrophysicsalternatives to inflationstabilityvelocity: acousticBorn-Infeld modelregularizationHigh Energy Physics - Theory (hep-th)gravitationRegularization (physics)adiabaticStrong coupling[PHYS.GRQC]Physics [physics]/General Relativity and Quantum Cosmology [gr-qc]primordial gravitational waves (theory)[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]Astrophysics - Cosmology and Nongalactic Astrophysicsdescription
We study the evolution of gravitational waves for non-singular cosmological solutions within the framework of Born-Infeld inspired gravity theories, with special emphasis on the Eddington-inspired Born-Infeld theory. We review the existence of two types of non-singular cosmologies, namely bouncing and asymptotically Minkowski solutions, from a perspective that makes their features more apparent. We study in detail the propagation of gravitational waves near these non-singular solutions and carefully discuss the origin and severity of the instabilities and strong coupling problems that appear. We also investigate the role of the adiabatic sound speed of the matter sector in the regularisation of the gravitational waves evolution. We extend our analysis to more general Born-Infeld inspired theories where analogous solutions are found. As a general conclusion, we obtain that the bouncing solutions are generally more prone to instabilities, while the asymptotically Minkowski solutions can be rendered stable, making them appealing models for the early universe.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2017-07-27 |