Inspirals into a charged black hole

Zhu, Ruomin; Osburn, Thomas

doi:10.1103/physrevd.97.104058

Cited by 12 publications

(19 citation statements)

References 58 publications

(82 reference statements)

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“…We then verified that only considering circular orbits by the time the mergers enter into the LIGO/Virgo sensitivity is a good approximation for EM radiating binaries as well as binaries with GW dominated emission. In Section 3.4 we saw that we could get a significant overestimation for the chirp mass of a binary system when projecting a charged signal onto uncharged templates, but it would require a somewhat high amount of charge of σ ∼ 0.1, which seems to agree with [40]. We saw that, according to our results, the weakly charged merger would likely be detected alongside uncharged mergers.…”

Section: Conclusion and Discussionsupporting

confidence: 73%

Charged Black Hole Mergers: Orbit Circularisation and Chirp Mass Bias

Christiansen,

Jiménez,

Mota

2020

Preprint

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We consider the inspiral of black holes carrying U(1) charge that is not electromagnetic, but corresponds to some dark sector. In the weak-field, lowvelocity regime, the components follow Keplerian orbits. We investigate how the orbital parameters evolve for dipole-dominated emission and find that the orbit quickly circularises, though not as efficiently as for a gravitationally dominated emission. We then regard circular orbits, and look for modifications in the gravitational waveform from the components carrying small charges. Taking this into account we populate the waveform with simplified LIGO noise and put it through a matched filtering procedure where the template bank only consists of uncharged templates, focusing on the charges' effect on the chirp mass estimation. We find a consistent overestimation of the 'generalised' chirp mass, and a possible over-and underestimation of the actual chirp mass. Finally, we briefly consider the effect of such charges on hyperbolic encounters, finding again a bias arising from interpreting the generalised chirp mass as the actual chirp mass.

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Section: Conclusion and Discussionsupporting

confidence: 73%

Charged Black Hole Mergers: Orbit Circularisation and Chirp Mass Bias

Christiansen,

Jiménez,

Mota

2020

Preprint

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“…Our formalism is equivalent to generalizing Moncrief's master equations to the nonhomogeneous case. A partial presentation of this formalism was made in [19], but that work did not consider electromagnetic source terms. This section completes that presentation by revealing how any nonvanishing electromagnetic sources are necessarily incorporated into the master function definitions and master equations.…”

Section: A Backgroundmentioning

confidence: 99%

“…Here we present a mature and practical "master function" formalism that mitigates disadvantages encountered in prior work. A partial presentation of this formalism was made in [19], but that analysis was restricted to an external environment consisting solely of a neutral point mass. This work generalizes that formalism to allow for arbitrary distributions of charged matter by carefully introducing appropriate electromagnetic source terms into the mathematical definitions of the master functions (see Sec.…”

Section: Introductionmentioning

confidence: 99%

“…We consider intermediate and extreme mass-ratio binary systems in this analysis (comparable mass binaries are not well represented by linear perturbation theory). Extreme mass-ratio binaries are valuable sources for the upcoming Laser Interferometer Space Antenna (LISA) mission [26], while intermediate mass-ratio binaries are important for both LISA and LIGO-Virgo [27,28] observations depending on the total mass of the system [19].…”

Section: Introductionmentioning

confidence: 99%

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Reissner-Nordström perturbation framework with gravitational wave applications

Burton,

Osburn

2020

Preprint

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We present a new convenient framework for modeling Reissner-Nordström black hole perturbations from charged distributions of matter. Using this framework, we quantify how gravitational wave observations of compact binary systems would be affected if one or both components were charged. Our approach streamlines the (linearized) Einstein-Maxwell equations through convenient master functions that we designed to ameliorate certain disadvantages of prior strategies. By solving our improved master equations with a point source, we are able to quantify the rate of orbital energy dissipation via electromagnetic and gravitational radiation. Through adiabatic and quasicircular approximations, we apply our dissipative calculations to determine trajectories for intermediate and extreme mass-ratio inspirals. By comparing trajectories and waveforms with varied charges to those with neutral components, we explore the potential effect of electric charge on gravitational wave signals. We observe that the case of opposite charge-to-mass ratios has the most dramatic impact. Our findings are largely interpreted through the lens of the upcoming LISA mission.

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“…Manipulating the magnetization by spin-orbit torque (SOT) in heavy metal/ferromagnet (HM/FM) systems is a promising mechanism for magnetic random access memory (MRAM) application [1][2][3]. The 3-terminal SOT device is superior in the stability of the MgO tunnel barrier than the traditional 2-terminal spin-transfer torque (STT) device, and the switching efficiency can be further enhanced by increasing the spin-Hall angle [4] and interface transparency [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Field-Free Switching of a Spin-Orbit-Torque Device Through Interlayer-Coupling-Induced Domain Walls

Liu

et al. 2020

Phys. Rev. Applied

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The spin-orbit torque device is promising as a candidate for next generation magnetic memory, while the static in-plane field needed to induce deterministic switching is a main obstacle for its application in highly integrated circuits. Instead of introducing effective field into the device, in this work we present an alternative way to achieve the field-free current-driven magnetization switching.By adding Tb/Co multilayers at two ends of the current channel, assisting domain wall is created by interlayer exchange coupling. The field-free deterministic switching is achieved by the movement of the domain wall driven by current. By loop shift measurement we find the driven force exerted on the domain wall is determined by the direction of the in-plane moment in the domain wall. Finally, we modify the device into a synthetic antiferromagnetic structure to solve the problem of reading out signal. The present work broadens the choice of field-free spin-orbit torque device design and clearly depicts the difference between two different switching mechanism.

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Inspirals into a charged black hole

Cited by 12 publications

References 58 publications

Charged Black Hole Mergers: Orbit Circularisation and Chirp Mass Bias

Charged Black Hole Mergers: Orbit Circularisation and Chirp Mass Bias

Reissner-Nordström perturbation framework with gravitational wave applications

Field-Free Switching of a Spin-Orbit-Torque Device Through Interlayer-Coupling-Induced Domain Walls

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