Empirically estimating the distribution of the loudest candidate from a gravitational-wave search

Tenorio, Rodrigo; Modafferi, Luana M.; Keitel, David; Sintes, Alicia M.

doi:10.48550/arxiv.2111.12032

Cited by 3 publications

(3 citation statements)

References 91 publications

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“…However, there are other benefits not captured in this number; for instance, the use of the sheared period coordinate and unresolved P allows the parameter space to remain effectively three-rather than four-dimensional. Second, the reduction in template numbers reduces the trials factor on parameter space and therefore the expected loudest background outliers [24], enabling the use of a lower threshold for followups.…”

Section: Discussionmentioning

confidence: 99%

Template lattices for a cross-correlation search for gravitational waves from Scorpius X-1

Wagner

Wofford

2022

Class. Quantum Grav.

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We describe the application of the lattice covering problem to the placement of templates in a search for continuous gravitational waves from the low-mass X-Ray binary Scorpius X-1. Efficient placement of templates to cover the parameter space at a given maximum mismatch is an application of the sphere covering problem, for which an implementation is available in the LatticeTiling software library. In the case of Sco X-1, potential correlations, in both the prior uncertainty and the mismatch metric, between the orbital period and orbital phase, lead to complications in the efficient construction of the lattice. We define a shearing coordinate transformation which simultaneously minimizes both of these sources of correlation, and allows us to take advantage of the small prior orbital period uncertainty. The resulting lattices have a factor of about 3 fewer templates than the corresponding parameter space grids constructed by the prior straightforward method, allowing a more sensitive search at the same computing cost and maximum mismatch.

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Section: Discussionmentioning

confidence: 99%

Template lattices for a cross-correlation search for gravitational waves from Scorpius X-1

Wagner

Wofford

2022

Class. Quantum Grav.

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“…In general, all these pipelines produce the so-called search candidates, i.e., potential astrophysical signals that need to be investigated in detail. These candidates undergo a series of post-processing veto steps, and then, the most interesting ones are followed up with different techniques in order to clearly establish their significance, e.g., [203][204][205][206][207][208][209][210][211][212][213][214]. A fraction of these candidates is vetoed if found near known instrumental artifacts, also known as spectral lines, typically present in the detectors [215].…”

Section: Search Methodsmentioning

confidence: 99%

Status and Perspectives of Continuous Gravitational Wave Searches

Piccinni

2022

Galaxies

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The birth of gravitational wave astronomy was triggered by the first detection of a signal produced by the merger of two compact objects (also known as a compact binary coalescence event). The following detections made by the Earth-based network of advanced interferometers had a significant impact in many fields of science: astrophysics, cosmology, nuclear physics and fundamental physics. However, compact binary coalescence signals are not the only type of gravitational waves potentially detectable by LIGO, Virgo, and KAGRA. An interesting family of still undetected signals, and the ones that are considered in this review, are the so-called continuous waves, paradigmatically exemplified by the gravitational radiation emitted by galactic, fast-spinning isolated neutron stars with a certain degree of asymmetry in their mass distribution. In this work, I will review the status and the latest results from the analyses of advanced detector data.

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“…However, this is not known analytically. We use the practical solution suggested in [32], which applies extreme value theory to empirically estimate this distribution from the search results themselves.…”

Section: Choice Of Thresholdmentioning

confidence: 99%

Search setup for long-duration transient gravitational waves from glitching pulsars during LIGO-Virgo third observing run

Modafferi,

Moragues,

Keitel

et al. 2022

Preprint

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Pulsars are spinning neutron stars which emit an electromagnetic beam. We expect pulsars to slowly decrease their rotational frequency. However, sudden increases of the rotational frequency have been observed from different pulsars. These events are called "glitches" and they are followed by a relaxation phase with timescales from days to months. Gravitational wave (GW) emission may follow these peculiar events. We give an overview of the setup for an analysis of GW data from the Advanced LIGO and Virgo third observing run (O3) [1] searching for transient GW signals lasting hours to months after glitches in known pulsars. The search method consists of placing a template grid in frequency-spindown space with fixed grid spacings. Then, for each point we compute the transient F-statistic which is maximized over a set of transient parameters like the duration and start time of the potential signals. A threshold on the detection statistic is then set, and we search for peaks over the parameter space for each candidate.

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Empirically estimating the distribution of the loudest candidate from a gravitational-wave search

Cited by 3 publications

References 91 publications

Template lattices for a cross-correlation search for gravitational waves from Scorpius X-1

Template lattices for a cross-correlation search for gravitational waves from Scorpius X-1

Status and Perspectives of Continuous Gravitational Wave Searches

Search setup for long-duration transient gravitational waves from glitching pulsars during LIGO-Virgo third observing run

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