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Luminal propagation of gravitational waves in scalar-tensor theories: The case for torsion
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SYSNO ASEP 0540212 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Luminal propagation of gravitational waves in scalar-tensor theories: The case for torsion Author(s) Barrientos, José (MU-W) SAI, ORCID, RID
Cordonier-Tello, F. (DE)
Corral, C. (CL)
Izaurieta, F. (CL)
Medina, P. (CL)
Rodríguez, E. (CO)
Valdivia, O. (CL)Article number 124039 Source Title Physical Review D: Particles, Fields, Gravitation and Cosmology. - : American Physical Society - ISSN 1550-7998
Roč. 100, č. 12 (2019)Number of pages 17 s. Language eng - English Country US - United States Keywords gravitational waves ; scalar-tensor theory Subject RIV BA - General Mathematics OECD category Pure mathematics Method of publishing Limited access Institutional support MU-W - RVO:67985840 UT WOS 000502791100011 EID SCOPUS 85077457634 DOI 10.1103/PhysRevD.100.124039 Annotation Scalar-tensor gravity theories with a nonminimal Gauss-Bonnet coupling typically lead to an anomalous propagation speed for gravitational waves, and have therefore been tightly constrained by multimessenger observations such as GW170817/GRB170817A. In this paper we show that this is not a general feature of scalar-tensor theories, but rather a consequence of assuming that spacetime torsion vanishes identically. At least for the case of a nonminimal Gauss-Bonnet coupling, removing the torsionless condition restores the canonical dispersion relation and therefore the correct propagation speed for gravitational waves. To achieve this result we develop a new approach, based on the first-order formulation of gravity, to deal with perturbations on these Riemann-Cartan geometries. Workplace Mathematical Institute Contact Jarmila Štruncová, struncova@math.cas.cz, library@math.cas.cz, Tel.: 222 090 757 Year of Publishing 2021 Electronic address https://doi.org/10.1103/PhysRevD.100.124039
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