Piercing of a boson star by a black hole

Cardoso, Vítor; Ikeda, Taishi; Zhong, Zhen; Zilhão, Miguel

doi:10.1103/physrevd.106.044030

Cited by 18 publications

(5 citation statements)

References 78 publications

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“…Due to the high uncertainty of these results and the ongoing discussion about it, it can be assumed without loss of generality that Sgr A * is (was) in fact spinning enough to engage a superradiant instability. We note, ho we ver, that e ven a non-spinning BH can bind a scalar 'cloud' if it was grown via some other mechanism (for example, primordial, Cardoso et al ( 2022a )).…”

Section: Discussionmentioning

confidence: 72%

Using the motion of S2 to constrain scalar clouds around Sgr A*

Foschi

Abuter

Aimar

et al. 2023

Monthly Notices of the Royal Astronomical Society

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The motion of S2, one of the stars closest to the Galactic Centre, has been measured accurately and used to study the compact object at the centre of the Milky Way. It is commonly accepted that this object is a supermassive black hole but the nature of its environment is open to discussion. Here, we investigate the possibility that dark matter in the form of an ultralight scalar field “cloud” clusters around Sgr A*. We use the available data for S2 to perform a Markov Chain Monte Carlo analysis and find the best-fit estimates for a scalar cloud structure. Our results show no substantial evidence for such structures. When the cloud size is of the order of the size of the orbit of S2, we are able to constrain its mass to be smaller than $0.1\%$ of the central mass, setting a strong bound on the presence of new fields in the galactic centre.

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Section: Discussionmentioning

confidence: 72%

Using the motion of S2 to constrain scalar clouds around Sgr A*

Foschi

Abuter

Aimar

et al. 2023

Monthly Notices of the Royal Astronomical Society

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“…When one of the two objects is surrounded by a scalar cloud, then the energy during a dynamical capture is not only emitted via GWs, but also exchanged with the cloud. This phenomenon was first computed in [55] and is akin to the "tidal capture" found in [56]. In this section, we will review the computation of the energy exchanged with the bound states of the cloud 3 and extend it to include unbound states as well.…”

Section: Jcap07(2023)070mentioning

confidence: 97%

Dynamical friction in gravitational atoms

Tomaselli

M.²,

Bertone

2023

J. Cosmol. Astropart. Phys.

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Due to superradiant instabilities, clouds of ultralight bosons can spontaneously grow around rotating black holes, creating so-called “gravitational atoms”. In this work, we study their dynamical effects on binary systems. We first focus on open orbits, showing that the presence of a cloud can increase the cross section for the dynamical capture of a compact object by more than an order of magnitude. We then consider closed orbits and demonstrate that the backreaction of the cloud's ionization on the orbital motion should be identified as dynamical friction. Finally, we study for the first time eccentric and inclined orbits. We find that, while ionization quickly circularizes the binary, it barely affects the inclination angle. These results enable a more realistic description of the dynamics of gravitational atoms in binaries and pave the way for dedicated searches with future gravitational wave detectors.

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“…So-called dark bosonstar binaries with purely gravitational interaction have been found to generate GW signatures distinguishable from other astrophysical objects like black holes, neutron stars and even 'normal' BSs [71]. Further simulations of compact binaries involving BSs include the piercing of bosonic clouds by a BH [72] and the inspiral of neutron stars with bosonic dark cores [73].…”

Section: Introductionmentioning

confidence: 99%

Unequal-mass boson-star binaries: initial data and merger dynamics

Evstafyeva

Sperhake

Helfer

et al. 2023

Class. Quantum Grav.

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We present a generalization of the curative initial data construction derived for equal-mass compact binaries in Refs.[1,2] to arbitrary mass ratios. We demonstrate how these improved initial data avoid substantial spurious artifacts in the collision dynamics of unequal-mass boson-star binaries in the same way as has previously been achieved with the simpler method restricted to the equal-mass case. We employ the improved initial data to explore in detail the impact of phase offsets in the coalescence of equal- and unequal-mass boson star binaries.

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Piercing of a boson star by a black hole

Cited by 18 publications

References 78 publications

Using the motion of S2 to constrain scalar clouds around Sgr A*

Using the motion of S2 to constrain scalar clouds around Sgr A*

Dynamical friction in gravitational atoms

Unequal-mass boson-star binaries: initial data and merger dynamics

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