Status and Perspectives of Continuous Gravitational Wave Searches

Piccinni, O. J.

doi:10.3390/galaxies10030072

Cited by 26 publications

(10 citation statements)

References 321 publications

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“…The possibility that the Galactic Center (GC) region hosts a large population of neutron stars calls for the search for continuous gravitational waves (CWs) that neutron stars would emit if their shape deviated from axial symmetry. Although previous searches have not reported any detection (see the reviews [19][20][21][22] and references therein plus the last results in [23][24][25][26][27][28][29]), improvements in detectors and data analysis pipelines [30] can increase the search sensitivity to a level at which detections can take place.…”

Section: Introductionmentioning

confidence: 99%

Search for continuous gravitational wave emission from the Milky Way center in O3 LIGO-Virgo data

Abbott¹,

Abe²,

Acernese³

et al. 2022

Phys. Rev. D

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We present a directed search for continuous gravitational wave (CW) signals emitted by spinning neutron stars located in the inner parsecs of the Galactic Center (GC). Compelling evidence for the presence of a numerous population of neutron stars has been reported in the literature, turning this region into a very interesting place to look for CWs. In this search, data from the full O3 LIGO-Virgo run in the detector frequency band ½10; 2000 Hz have been used. No significant detection was found and 95% confidence level upper limits on the signal strain amplitude were computed, over the full search band, with the deepest limit of about 7.6 × 10 −26 at ≃142 Hz. These results are significantly more constraining than those reported in previous searches. We use these limits to put constraints on the fiducial neutron star ellipticity and r-mode amplitude. These limits can be also translated into constraints in the black hole mass-boson mass plane for a hypothetical population of boson clouds around spinning black holes located in the GC.

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Section: Introductionmentioning

confidence: 99%

Search for continuous gravitational wave emission from the Milky Way center in O3 LIGO-Virgo data

Abbott¹,

Abe²,

Acernese³

et al. 2022

Phys. Rev. D

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“…Since mountains are long lived, they are promising candidates for continuous gravitational-wave detection. There are complementary reviews on this subject, which the reader is referred to for more information (Palomba 2012, Sieniawska and Bejger 2019, Tenorio et al 2021, Piccinni 2022, Haskell and Bejger 2023, Riles 2023, Wette 2023.…”

Section: Introductionmentioning

confidence: 99%

Gravitational waves from neutron-star mountains

Gittins

2024

Class. Quantum Grav.

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Rotating neutron stars that support long-lived, non-axisymmetric deformations known as mountains have long been considered potential sources of gravitational radiation. However, the amplitude from such a source is very weak and current gravitational-wave interferometers have yet to witness such a signal. The lack of detections has provided upper limits on the size of the involved deformations, which are continually being constrained. With expected improvements in detector sensitivities and analysis techniques, there is good reason to anticipate an observation in the future. This review concerns the current state of the theory of neutron-star mountains. These exotic objects host the extreme regimes of modern physics, which are related to how they sustain mountains. We summarise various mechanisms that may give rise to asymmetries, including crustal strains built up during the evolutionary history of the neutron star, the magnetic field distorting the star's shape and accretion episodes gradually constructing a mountain. Moving beyond the simple rotating model, we also discuss how precession affects the dynamics and modifies the gravitational-wave signal. We describe the prospects for detection and the challenges moving forward.

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“…Short-duration signals are expected to be produced by other sources, the most important being core-collapse supernovae [15]: both modeled and unmodeled searches are ongoing for such signals. Additionally, continuouswave signals are expected to be produced by rotating pulsars [16]. Although they have not been detected yet, the upper limits obtained so far are already more stringent that the spindown limits for many systems.…”

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confidence: 95%