Detecting Scalar Fields with Extreme Mass Ratio Inspirals

Maselli, Andrea; Franchini, Nicola; Gualtieri, Leonardo; Sotiriou, Thomas P.

doi:10.1103/physrevlett.125.141101

Cited by 65 publications

(53 citation statements)

References 55 publications

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“…Therefore, it is possible to construct scalarization models that are consistent with current observations, while still having interesting strong field phenomenology. It's worth noting that future gravitational-wave observations, such as for instance the observations of extreme mass ratio inspirals by LISA [43,44], will reach the precision to measure small scalar charges for neutron stars and black holes.…”

Section: Discussionmentioning

confidence: 99%

Neutron star scalarization with Gauss-Bonnet and Ricci scalar couplings

et al. 2021

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Spontaneous scalarization of neutron stars has been extensively studied in the Damour and Esposito-Farèse model, in which a scalar field couples to the Ricci scalar or, equivalently, to the trace of the energy-momentum tensor. However, scalarization of both black holes and neutron stars may also be triggered by a coupling of the scalar field to the Gauss-Bonnet invariant. The case of the Gauss-Bonnet coupling has also received a lot of attention lately, but the synergy of the Ricci and Gauss-Bonnet couplings has been overlooked for neutron stars. Here, we show that combining both couplings has interesting effects on the properties of scalarized neutron stars, such as affecting their domain of existence or the amount of scalar charge they carry.

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Section: Discussionmentioning

confidence: 99%

Neutron star scalarization with Gauss-Bonnet and Ricci scalar couplings

et al. 2021

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“…On the other hand, tidal heating in extreme mass-ratio inspirals (EMRIs) can produce thousands of radians of accumulated orbital phase [27][28][29][30][31] while in the sensitivity band of the future space-based Laser Interferometer Space Antenna (LISA) [32]. Recently, this effect was studied to develop a test that can place very stringent and modelindependent constraints on the reflectivity of supermassive ob-jects [31,33], which adds to other unparalleled EMRI-based tests of fundamental physics, such as no-hair theorem tests based on measurements of the multipolar structure of the central object [31,[34][35][36][37][38], constraints on extra degrees of freedom arising in modified gravity [39][40][41][42][43], and null-hypothesis tests based on the absence of tidal Love numbers [44]. Altogether, these tests suggest that EMRIs will be unique probes of the nature of supermassive objects (for recent reviews on these and other tests, see Refs.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, in gravity theories with higher curvature corrections to General Relativity, the metric of a supermassive object is generically expected to be Kerr[43].…”

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confidence: 99%

Extreme mass-ratio inspirals around a spinning horizonless compact object

Maggio,

van de Meent,

Pani

2021

Preprint

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Extreme mass-ratio inspirals (EMRIs) detectable by the Laser Interferometer Space Antenna (LISA) are unique probes of the nature of supermassive compact objects. We compute the gravitational-wave signal emitted by a stellar-mass compact object in a circular equatorial orbit around a Kerr-like horizonless supermassive object defined by an effective radius and a reflectivity coefficient. The Teukolsky equations are solved consistently with suitable (frequency-dependent) boundary conditions, and the modified energy and angular-momentum fluxes are used to evolve the orbital parameters adiabatically. The gravitational fluxes have resonances corresponding to the low-frequency quasinormal modes of the central object, which can contribute significantly to the gravitationalwave phase. Overall, the absence of a classical event horizon in the central object can affect the gravitationalwave signal dramatically, with deviations even larger than those previously estimated by a model-independent analysis of the tidal heating. We estimate that EMRIs could potentially place the most stringent constraint on the reflectivity of supermassive compact objects at the remarkable level of O(10 −6 )% and would allow to constrain various models which are not ruled out by the ergoregion instability. In particular, an EMRI detection could allow to rule out (or provide evidence for) signatures of quantum black-hole horizons with Boltzmann reflectivity. Our results motivate performing rigorous parameter estimations to assess the detectability of these effects.

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“…On the other hand, a minimally coupled scalar field describes the QNMs in the area of scalar-tensor theories, and observing quasi-resonance modes and anomalous decay rate of QN modes motivates one to investigate these models as well. Besides, more recently it has been shown that if the primary supermassive BHs in the extreme mass ratio inspirals do not carry a significant scalar charge, the non-minimal coupling factor vanishes, which the Laser Interferometer Space Antenna (LISA) will still be able to detect and further measure scalar charge [30].…”

Section: Introductionmentioning

confidence: 99%

Stability and phase transition of rotating Kaluza–Klein black holes

et al. 2021

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In this paper, we investigate the thermodynamics and phase transitions of a four-dimensional rotating Kaluza–Klein black hole solution in the presence of Maxwell electrodynamics. Calculating the conserved and thermodynamic quantities shows that the first law of thermodynamics is satisfied. To find the stable black hole’s criteria, we check the stability in the canonical ensemble by analyzing the behavior of the heat capacity. We also consider a massive scalar perturbation minimally coupled to the background geometry of the four-dimensional static Kaluza–Klein black hole and investigate the quasinormal modes by employing the Wentzel–Kramers–Brillouin (WKB) approximation. The anomalous decay rate of the quasinormal modes spectrum is investigated by using the sixth-order WKB formula and quasi-resonance modes of the black hole are studied with averaging of Padé approximations as well.

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Detecting Scalar Fields with Extreme Mass Ratio Inspirals

Cited by 65 publications

References 55 publications

Neutron star scalarization with Gauss-Bonnet and Ricci scalar couplings

Neutron star scalarization with Gauss-Bonnet and Ricci scalar couplings

Extreme mass-ratio inspirals around a spinning horizonless compact object

Stability and phase transition of rotating Kaluza–Klein black holes

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