Gravitational Waves in Modified Gravity
A special issue of Universe (ISSN 2218-1997). This special issue belongs to the section "Gravitation".
Deadline for manuscript submissions: closed (10 June 2022) | Viewed by 2601
Special Issue Editor
Special Issue Information
Dear Colleagues,
More than a century after its formulation, general relativity (GR) still stands firm as the prevailing theory of gravity. Classic tests have been improved over the decades by orders of magnitude with the help of quantum technology and precision solar-system measurements, while observations of pulsars in binaries and other astrophysical phenomena have enabled a new range of tests for probing the properties of spacetime. In recent years, the detection of gravitational waves (GWs) from compact binaries has given us direct tests of the strong-field dynamics of GR. Despite GR’s resilience to experimental scrutiny, theoretical considerations as well as observations at cosmological scales provide strong motivation to study viable alternative theories of gravity.
The impact of GW observations on fundamental physics is highlighted by the plethora and diversity of results obtained in these early years of observational GW astrophysics. For instance, the observation of compact binary inspirals has placed stringent bounds on deviations from the binary dynamics of GR; the lack of GW dispersion has constrained theories that predict a modified dispersion relation for the graviton; the coincident detection of GW and EM radiation from a binary neutron star merger (GW170817) tied the speed of gravity very closely to the speed of light; the observation of ringdown signals allowed for the first attempts to perform black-hole spectroscopy and constrain the possibility that sources comprise exotic compact objects, etc. Theories of modified gravity can manifest their fundamental differences from GR in different ways, and we expect such information to be encoded in the GWs emitted by strongly gravitating sources.
This Special Issue aims to bring together a collection of works that cover the developing field of GW phenomenology in modified theories of gravity. Our focus will be on research related to the study of astrophysical sources of gravitational waves in modified gravity and the development of methods to test these theories with current and future detectors. Review articles on the state of the art of well-motivated theories and their GW phenomenology are also welcome.
Dr. Michalis Agathos
Guest Editor
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Keywords
- modified gravity
- gravitational waves
- tests of GR
- strong gravity
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