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dc.contributor.authorGerosa, Davide
dc.contributor.authorSperhake, Ulrich
dc.contributor.authorOtt, Christian D.
dc.descriptionThis is the final version of the article. It first appeared from the Institute of Physics via
dc.description.abstractWe present numerical-relativity simulations of spherically symmetric core collapse and compact-object formation in scalar-tensor theories of gravity. The additional scalar degree of freedom introduces a propagating monopole gravitational-wave mode. Detection of monopole scalar waves with current and future gravitational-wave experiments may constitute smoking gun evidence for strong-field modifications of general relativity. We collapse both polytropic and more realistic pre-supernova profiles using a high-resolution shock-capturing scheme and an approximate prescription for the nuclear equation of state. The most promising sources of scalar radiation are protoneutron stars collapsing to black holes. In case of a galactic core collapse event forming a black hole, Advanced LIGO may be able to place independent constraints on the parameters of the theory at a level comparable to current solar-system and binary-pulsar measurements. In the region of the parameter space admitting spontaneously scalarised stars, transition to configurations with prominent scalar hair before black-hole formation further enhances the emitted signal. Although a more realistic treatment of the microphysics is necessary to fully investigate the occurrence of spontaneous scalarisation of neutron star remnants, we speculate that formation of such objects could constrain the parameters of the theory beyond the current bounds obtained with solar-system and binary-pulsar experiments.en
dc.description.sponsorshipUniversity of Cambridge (Isaac Newton Studentship)
dc.description.sponsorshipH2020 ERC Consolidator Grant ‘Matter and strong-field gravity: New frontiers in Einstein’s theory’ (Grant ID: MaGRaTh-646597)
dc.description.sponsorshipEuropean Union Horizon 2020 research and innovation programme under the Marie Skludowska-Curie (Grant ID: 690904)
dc.description.sponsorshipScience and Technology Facilities Council (Grant ID: ST/L000636/1)
dc.description.sponsorshipNational Science Foundation (Grant ID: TG-PHY090003)
dc.description.sponsorshipNational Science Foundation (Grant ID: TG-PHY100033)
dc.description.sponsorshipCambridge High Performance Computing Service Supercomputer Darwin using Strategic Research Infrastructure Funding from the HEFCE and the STFC, and DiRAC’s Cosmos Shared Memory system through BIS (Grant ID: ST/J005673/1)
dc.description.sponsorshipScience and Technology Facilities Council (Grant ID: ST/H008586/1)
dc.description.sponsorshipScience and Technology Facilities Council (Grant ID: ST/K00333X/1)
dc.description.sponsorshipNational Science Foundation (Grant ID: PHY1151197)
dc.description.sponsorshipNational Science Foundation (Grant ID: PHY-1404569)
dc.description.sponsorshipInternational Research Unit of Advanced Future Studies, Kyoto University
dc.publisherInstitute of Physicsen
dc.rightsAttribution 4.0 International*
dc.subjectmodified theories of gravityen
dc.subjectgravitational wavesen
dc.titleNumerical simulations of stellar collapse in scalar-tensor theories of gravityen
prism.publicationNameClassical and Quantum Gravityen
cam.orpheus.successThu Jan 30 12:57:45 GMT 2020 - The item has an open VoR version.*

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Attribution 4.0 International
Except where otherwise noted, this item's licence is described as Attribution 4.0 International