Hidden Markov model tracking of continuous gravitational waves from a binary neutron star with wandering spin. II. Binary orbital phase tracking

Suvorova, Sofia; Clearwater, P.; Melatos, A.; Sun, L.; Moran, William; Evans, R.

doi:10.1103/physrevd.96.102006

Cited by 55 publications

(174 citation statements)

References 66 publications

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“…where a 0 is the BH's projected semimajor axis, P is the orbital period, and c is the speed of light [77]. Frequencydomain matched filters, like those presented in [77,113], can be applied to sum up the distributed signal power using (imperfect) knowledge of the orbital parameters. Those methods would generally demand B 0.5 Hz in order to achieve the required sensitivity (see Sec.…”

Section: X-ray Binariesmentioning

confidence: 99%

Directed searches for gravitational waves from ultralight bosons

et al. 2019

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Gravitational-wave detectors can be used to search for yet-undiscovered ultralight bosons, including those conjectured to solve problems in particle physics, high-energy theory and cosmology. In particular, ground-based instruments could probe boson masses between 10 −15 eV to 10 −11 eV, which are largely inaccessible to other experiments. In this paper, we explore the prospect of searching for the continuous gravitational waves generated by boson clouds around known black holes. We carefully study the predicted waveforms and use the latest-available numerical results to model signals for different black-hole and boson parameters. We then demonstrate the suitability of a specific method (hidden Markov model tracking) to efficiently search for such signals, even when the source parameters are not perfectly known and allowing for some uncertainty in theoretical predictions. We empirically study this method's sensitivity and computational cost in the context of boson signals, finding that it will be possible to target remnants from compact-binary mergers localized with at least three instruments. For signals from scalar clouds, we also compute detection horizons for future detectors (Advanced LIGO, LIGO Voyager, Cosmic Explorer and the Einstein Telescope). Among other results, we find that, after one year of observation, an Advanced LIGO detector at design sensitivity could detect these sources up to over 100 Mpc, while Cosmic Explorer could reach over 10 4 Mpc. These projections offer a more complete picture than previous estimates based on analytic approximations to the signal power or idealized search strategies. Finally, we discuss specific implications for the followup of compact-binary coalescences and black holes in x-ray binaries. Along the way, we review the basic physics of bosons around black holes, in the hope of providing a bridge between the theory and data-analysis literatures.

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Section: X-ray Binariesmentioning

confidence: 99%

Directed searches for gravitational waves from ultralight bosons

et al. 2019

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“…The coherence time issue leads into future work for data analysis: Accretion and glitches can also introduce issues which encourage development of alternatives to the straightforward coherent integrations considered here. Adaptations of semi-coherent techniques developed for other searches [54][55][56][57] could be fruitful for r-modes from known pulsars too. For those pulsars with a known inclination angle, upgrading from the F-statistic to the G-statistic will also improve sensitivity.…”

Section: Discussionmentioning

confidence: 99%

How to search for gravitational waves from r -modes of known pulsars

et al. 2019

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Searches for continuous gravitational waves from known pulsars so far have been targeted at or near the spin frequency or double the spin frequency of each pulsar, appropriate for mass quadrupole emission. But some neutron stars might radiate strongly through current quadrupoles via r-modes, which oscillate at about four thirds the spin frequency. We show for the first time how to construct searches over appropriate ranges of frequencies and spin-down parameters to target r-modes from known pulsars. We estimate computational costs and sensitivities of realistic r-mode searches using the coherent F-statistic, and find that feasible searches for known pulsars can beat spin-down limits on gravitational wave emission even with existing LIGO and Virgo data.

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“…An analytic approximation of the true PDF is discussed in Ref. [46]. The search cost increases approximately ∝ N T for both methods.…”

Section: B Path Probability Distribution Versus Snrmentioning

confidence: 99%

Tracking continuous gravitational waves from a neutron star at once and twice the spin frequency with a hidden Markov model

2019

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Searches for continuous gravitational waves from rapidly spinning neutron stars normally assume that the star rotates about one of its principal axes of moment of inertia, and hence the gravitational radiation emits only at twice the spin frequency of the star, 2f . The superfluid interior of a star pinned to the crust along an axis nonaligned with any of its principal axes allows the star to emit gravitational waves at both f and 2f , even without free precession, a phenomenon not clearly observed in known pulsars. The dual-harmonic emission mechanism motivates searches combining the two frequency components of a signal to improve signal-to-noise ratio. We describe an economical, semicoherent, dual-harmonic search method, combined with a maximum likelihood coherent matched filter, F-statistic, and improved from an existing hidden Markov model (HMM) tracking scheme to track two frequency components simultaneously. We validate the method and demonstrate its performance through Monte Carlo simulations. We find that for sources emitting gravitational waves at both f and 2f , the rate of correctly recovering synthetic signals (i.e., detection efficiency), at a given false alarm probability, can be improved by ∼ 10%-70% by tracking two frequencies simultaneously compared to tracking a single component only. For sources emitting at 2f only, dual-harmonic tracking only leads to minor sensitivity loss, producing 10% lower detection efficiency than tracking a single component. In directed continuous-wave searches where f is unknown and hence the full frequency band is searched, the computationally efficient HMM tracking algorithm provides an option of conducting both the dual-harmonic search and the conventional single frequency tracking to obtain optimal sensitivity, with a typical run time of ∼ 10 3 core-hr for one year's observation.

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Hidden Markov model tracking of continuous gravitational waves from a binary neutron star with wandering spin. II. Binary orbital phase tracking

Cited by 55 publications

References 66 publications

Directed searches for gravitational waves from ultralight bosons

Directed searches for gravitational waves from ultralight bosons

How to search for gravitational waves from r -modes of known pulsars

Tracking continuous gravitational waves from a neutron star at once and twice the spin frequency with a hidden Markov model

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