Special Issue "Gravitational Radiation in Cosmological Spacetimes"
Deadline for manuscript submissions: 31 July 2022 | Viewed by 913
Interests: gravitational wave theory; resonance effects in neutron stars and black hole spacetimes; gravitational radiation in cosmological spacetimes; early universe cosmology
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Special Issue in Universe: Tidal Effects in General Relativity
Gravitational waves are now observed by LIGO-Virgo a few times a month, and it is difficult to imagine that in the early days of General Relativity, their physical reality was debated. However, many prominent scientists including Einstein himself questioned whether gravitational waves truly exist in nature. Theoretical developments to study gravitational waves generated by compact sources such as binary black holes in asymptotically flat spacetimes and the observation of the orbital decay in the Hulse–Taylor binary in the 1970s put an end to this debate. These theoretical advances also allowed the study of the nonlinear effects inherent in General Relativity by studying radiation at future null infinity. Despite these amazing advancements on the theoretical side, gravitational waves in cosmological spacetimes are still mostly studied in the linearized setting. With the increasing sensitivity of gravitational wave observatories, we will observe radiation emitted by sources increasingly far away, and therefore, cosmological effects will become important. Consequently, a fundamental understanding beyond geometrics optics approximation in the linearized setting is needed.
This Special Issue aims to collect and act as a catalyzer for progress in our understanding of gravitational waves emitted by compact sources in cosmological spacetimes—both with and without a cosmological constant.
Dr. B.P. Bonga (Béatrice)
Manuscript Submission Information
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- gravitational waves
- cosmological constant
- FLRW spacetimes
- de Sitter spacetime
- null infinity
The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.
Title: Gravitational radiation with non-negative cosmological constant
Authors: José M M Senovilla
Affiliation: Departamento de Física, Universidad del País Vasco UPV/EHU, Apartado 48080, Bilbao, Spain； EHU Quantum Center, Universitu of the Basque Country UPV/EHU
Abstract: The existence of gravitational radiation arriving at null infinity J+ –i.e. escaping from the physical system– is addressed in the presence of a non-negative cosmological constant. The case with vanishing cosmological constant is well understood and relies on the properties of the News tensor field (or the News function) defined at infinity. The situation is drastically different when Lambda >0 where there is no known notion of ‘News’ with similar good properties. In this paper both situations are considered jointly from a tidal point of view, that is, taking into account the strength (or energy) of the curvature tensors. This leads to a novel characterization of gravitational radiation valid for the general case that has been proven to be equivalent, when Lambda = 0, to the standard one based on News. The implications of this result (on asymptotic symmetries, peeling theorem, balance laws, and others) are analyzed in some detail when Lambda > 0. Several explicit illustrative examples are provided.