Multi-Messenger Astrophysics with THESEUS in the 2030s

Ciolfi, Riccardo; Stratta, Giulia; Branchesi, Marica; Gendre, Bruce; Grimm, Stefan; Harms, Jan; Lamb, Gavin Paul; Martin-Carrillo, Antonio; McCann, Ayden; Oganesyan, Gor; Palazzi, Eliana; Ronchini, Samuele; Rossi, Andrea; Salafia, Om Sharan; Salmon, Lana; Ascenzi, Stefano; Capone, Antonio; Celli, Silvia; Dall'Osso, Simone; Di Palma, Irene; Fasano, Michela; Fermani, Paolo; Guetta, Dafne; Hanlon, Lorraine; Howell, Eric; Paltani, Stephane; Rezzolla, Luciano; Vinciguerra, Serena; Zegarelli, Angela; Amati, Lorenzo; Blain, Andrew; Bozzo, Enrico; Chaty, Sylvain; D'Avanzo, Paolo; De Pasquale, Massimiliano; Dereli-Bégué, Hüsne; Ghirlanda, Giancarlo; Gomboc, Andreja; Götz, Diego; Horvath, Istvan; Hudec, Rene; Izzo, Luca; Floch, Emeric Le; Li, Liang; Longo, Francesco; Komossa, S.; Kong, Albert K. H.; Mereghetti, Sandro; Mignani, Roberto; Nathanail, Antonios; O'Brien, Paul T.; Osborne, Julian P.; Pe'er, Asaf; Piranomonte, Silvia; Rosati, Piero; Savaglio, Sandra; Schüssler, Fabian; Sergijenko, Olga; Shao, Lijing; Tanvir, Nial; Turriziani, Sara; Urata, Yuji; van Putten, Maurice; Vergani, Susanna; Zane, Silvia; Zhang, Bing

doi:10.48550/arxiv.2104.09534

Cited by 2 publications

(2 citation statements)

References 125 publications

(190 reference statements)

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“…We expect the theories in consideration to be constrained by the X-ray timing data from the ongoing Neutron star Interior Composition Explorer (NICER) program (see e.g., recent results in Refs. [35,36]), and future planned X-ray satellites like THESEUS [37]. As an application of the numerical results of the scalarized NSs, we follow Refs.…”

Section: Introductionmentioning

confidence: 99%

Scalarized neutron stars in massive scalar-tensor gravity: X-ray pulsars and tidal deformability

Hu,

Gao,

et al. 2021

Preprint

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Neutron stars (NSs) in scalar-tensor theories of gravitation with the phenomenon of spontaneous scalarization can develop significant deviations from general relativity. Cases with a massless scalar were studied widely.Here we compare the NS scalarizations in the Damour-Esposito-Farèse theory, the Mendes-Ortiz theory, and the ξ-theory with a massive scalar field. Numerical solutions for slowly rotating NSs are obtained. They are used to construct the X-ray pulse profiles of a pair of extended hot spots on the surface of NSs. We also calculate the tidal deformability for NSs with spontaneous scalarization which is done for the first time with a massive scalar field. We show the universal relation between the moment of inertia and the tidal deformability. The X-ray pulse profiles, the tidal deformability, and the universal relation may help to constrain the massive scalar-tensor theories in X-ray and gravitational-wave observations of NSs, including the Neutron star Interior Composition Explorer (NICER) satellite, Square Kilometre Array (SKA) telescope, and LIGO/Virgo/KAGRA laser interferometers.

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Section: Introductionmentioning

confidence: 99%

Scalarized neutron stars in massive scalar-tensor gravity: X-ray pulsars and tidal deformability

Hu,

Gao,

et al. 2021

Preprint

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“…The description of post-merger remnants as quasi-equilibrium models has applications in the interpretation of the post-merger GW spectrum; in the study of the threshold mass to prompt collapse; in the construction of universal or empirical relations between properties of the remnants and properties of nonrotating models; and in modeling of processes taking place on longer timescales that are relevant for multi-messenger follow-up studies of GW detections (Ciolfi et al 2021;Rosati et al 2021). We plan to elaborate further on these aspects in future work.…”

Section: Discussion and Outlookmentioning

confidence: 99%

Models of binary neutron star remnants with tabulated equations of state

Iosif,

Stergioulas

2021

Preprint

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The emergence of novel differential rotation laws that can reproduce the rotational profile of binary neutron star merger remnants has opened the way for the construction of equilibrium models with properties that resemble those of remnants in numerical simulations. We construct models of merger remnants, using the 4-parameter differential rotation law by Uryū et al. (2017) and three tabulated, zero-temperature equations of state. The models have angular momenta that are determined by empirical relations, constructed through numerical simulations. After a systematic exploration of the parameter space of merger remnant equilibrium sequences, which includes the determination of turning points along constant-angular-momentum sequences, we find that a particular rotation law can reproduce the threshold mass to prompt collapse to a black hole with a relative difference of only ∼ 1% with respect to numerical simulations, in all cases considered. Furthermore, our results indicate a possible correlation between the compactness of equilibrium models of remnants at the threshold mass and the compactness of maximum-mass nonrotating models. Another key prediction of binary neutron star merger simulations is a relatively slowly rotating inner region, where the angular velocity Ω (as measured by an observer at infinity) is mostly due to the frame dragging angular velocity 𝜔. In our investigation of the parameter space of the Uryu+ rotation law, we naturally find quasi-spherical (Type A) remnant models with this property. Our investigation clarifies the impact of the differential rotation law and of the equation of state on key properties of binary neutron star remnants and lays the groundwork for including thermal effects in future studies.

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Multi-Messenger Astrophysics with THESEUS in the 2030s

Cited by 2 publications

References 125 publications

Scalarized neutron stars in massive scalar-tensor gravity: X-ray pulsars and tidal deformability

Scalarized neutron stars in massive scalar-tensor gravity: X-ray pulsars and tidal deformability

Models of binary neutron star remnants with tabulated equations of state

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