The gravitational wave background (also GWB and stochastic background) is a random gravitational-wave signal potentially detectable by gravitational wave detection experiments. Since the background is supposed[by whom?] to be statistically random, it has yet been researched only in terms of such statistical descriptors as the mean, the variance, etc.
Several potential sources for the background are hypothesized across various frequency bands of interest, with each source producing a background with different statistical properties. The sources of the stochastic background can be broadly divided into two categories: cosmological sources, and astrophysical sources.
Cosmological sources
Cosmological backgrounds may arise from several early universe sources. Some examples of these sources include time-varying scalar (classical) fields in the early universe, "preheating" mechanisms after inflation involving energy transfer from inflaton particles to regular matter, phase transitions in the early universe (such as the electroweak phase transition), cosmic strings, etc. While these sources are more hypothetical, a detection of a background from them would be a major discovery of new physics. The detection of such an inflationary background would have a profound impact on early-universe cosmology and on high-energy physics.
Astrophysical sources
An astrophysical background is produced by the confused noise of many weak, independent, and unresolved astrophysical sources.[1] For instance the astrophysical background from stellar mass binary black-hole mergers is expected to be a key source of the stochastic background for the current generation of ground based gravitational-wave detectors. LIGO and Virgo detectors have already detected individual gravitational-wave events from such black-hole mergers. However, there would be a large population of such mergers which would not be individually resolvable which would produce a hum of random looking noise in the detectors. Other astrophysical sources which are not individually resolvable can also form a background. For instance, a sufficiently massive star at the final stage of its evolution will collapse to form either a black hole or a neutron star – in the rapid collapse during the final moments of an explosive supernova event, which can lead to such formations, gravitational waves may theoretically be liberated.[2][3] Also, in rapidly rotating neutron stars there is a whole class of instabilities driven by the emission of gravitational waves.
The nature of source also depend on the sensitive frequency band of the signal. The current generation of ground based experiments like LIGO and Virgo are sensitive to gravitational-waves in the audio frequency band between approximately 10 Hz to 1000 Hz. In this band the most likely source of the stochastic background will be an astrophysical background from binary neutron-star and stellar mass binary black-hole mergers.[4]
Detection
On 11 February 2016, the LIGO and Virgo collaborations announced the first direct detection and observation of gravitational waves, which took place in September 2015. In this case, two black holes had collided to produce detectable gravitational waves. This is the first step to the potential detection of a GWB.[5][6]
^Joseph D. Romano, Neil. J. Cornish (2017). "Detection methods for stochastic gravitational-wave backgrounds: a unified treatment". Living Rev Relativ. 20 (1): 2. arXiv:1608.06889. Bibcode:2017LRR....20....2R. doi:10.1007/s41114-017-0004-1. PMC5478100. PMID 28690422.
^Ott, Christian D.; et al. (2012). "Core-Collapse Supernovae, Neutrinos, and Gravitational Waves". Nuclear Physics B: Proceedings Supplements. 235: 381–387. arXiv:1212.4250. Bibcode:2013NuPhS.235..381O. doi:10.1016/j.nuclphysbps.2013.04.036. S2CID 34040033.
^Fryer, Chris L.; New, Kimberly C. B. (2003). "Gravitational Waves from Gravitational Collapse". Living Reviews in Relativity. 6 (1): 2. arXiv:gr-qc/0206041. Bibcode:2003LRR.....6....2F. doi:10.12942/lrr-2003-2. PMC5253977. PMID 28163639.
^LIGO Scientific Collaboration and Virgo Collaboration; Abbott, B. P.; Abbott, R.; Abbott, T. D.; Acernese, F.; Ackley, K.; Adams, C.; Adams, T.; Addesso, P.; Adhikari, R. X.; Adya, V. B. (28 February 2018). "GW170817: Implications for the Stochastic Gravitational-Wave Background from Compact Binary Coalescences". Physical Review Letters. 120 (9): 091101. arXiv:1710.05837. Bibcode:2018PhRvL.120i1101A. doi:10.1103/PhysRevLett.120.091101. PMID 29547330.
^Abbott, B.P.; et al. (2016). "Observation of Gravitational Waves from a Binary Black Hole Merger". Phys. Rev. Lett.116 (6): 061102. arXiv:1602.03837. Bibcode:2016PhRvL.116f1102A. doi:10.1103/PhysRevLett.116.061102. PMID 26918975. S2CID 124959784.
^Castelvecchi, Davide; Witze, Alexandra (11 February 2016). "Einstein's gravitational waves found at last". Nature News. doi:10.1038/nature.2016.19361. S2CID 182916902. Retrieved 11 February 2016.
External links
Gravitational Wave Experiments and Early Universe Cosmology
February 25, 2023
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The gravitational wave background also GWB and stochastic background is a random gravitational wave signal potentially detectable by gravitational wave detection experiments Since the background is supposed by whom to be statistically random it has yet been researched only in terms of such statistical descriptors as the mean the variance etc Contents 1 Sources of a stochastic background 2 Cosmological sources 3 Astrophysical sources 4 Detection 5 See also 6 References 7 External linksSources of a stochastic background EditSeveral potential sources for the background are hypothesized across various frequency bands of interest with each source producing a background with different statistical properties The sources of the stochastic background can be broadly divided into two categories cosmological sources and astrophysical sources Cosmological sources EditCosmological backgrounds may arise from several early universe sources Some examples of these sources include time varying scalar classical fields in the early universe preheating mechanisms after inflation involving energy transfer from inflaton particles to regular matter phase transitions in the early universe such as the electroweak phase transition cosmic strings etc While these sources are more hypothetical a detection of a background from them would be a major discovery of new physics The detection of such an inflationary background would have a profound impact on early universe cosmology and on high energy physics Astrophysical sources EditAn astrophysical background is produced by the confused noise of many weak independent and unresolved astrophysical sources 1 For instance the astrophysical background from stellar mass binary black hole mergers is expected to be a key source of the stochastic background for the current generation of ground based gravitational wave detectors LIGO and Virgo detectors have already detected individual gravitational wave events from such black hole mergers However there would be a large population of such mergers which would not be individually resolvable which would produce a hum of random looking noise in the detectors Other astrophysical sources which are not individually resolvable can also form a background For instance a sufficiently massive star at the final stage of its evolution will collapse to form either a black hole or a neutron star in the rapid collapse during the final moments of an explosive supernova event which can lead to such formations gravitational waves may theoretically be liberated 2 3 Also in rapidly rotating neutron stars there is a whole class of instabilities driven by the emission of gravitational waves The nature of source also depend on the sensitive frequency band of the signal The current generation of ground based experiments like LIGO and Virgo are sensitive to gravitational waves in the audio frequency band between approximately 10 Hz to 1000 Hz In this band the most likely source of the stochastic background will be an astrophysical background from binary neutron star and stellar mass binary black hole mergers 4 Detection EditOn 11 February 2016 the LIGO and Virgo collaborations announced the first direct detection and observation of gravitational waves which took place in September 2015 In this case two black holes had collided to produce detectable gravitational waves This is the first step to the potential detection of a GWB 5 6 See also EditCosmic microwave background Cosmic neutrino backgroundReferences Edit Joseph D Romano Neil J Cornish 2017 Detection methods for stochastic gravitational wave backgrounds a unified treatment Living Rev Relativ 20 1 2 arXiv 1608 06889 Bibcode 2017LRR 20 2R doi 10 1007 s41114 017 0004 1 PMC 5478100 PMID 28690422 Ott Christian D et al 2012 Core Collapse Supernovae Neutrinos and Gravitational Waves Nuclear Physics B Proceedings Supplements 235 381 387 arXiv 1212 4250 Bibcode 2013NuPhS 235 381O doi 10 1016 j nuclphysbps 2013 04 036 S2CID 34040033 Fryer Chris L New Kimberly C B 2003 Gravitational Waves from Gravitational Collapse Living Reviews in Relativity 6 1 2 arXiv gr qc 0206041 Bibcode 2003LRR 6 2F doi 10 12942 lrr 2003 2 PMC 5253977 PMID 28163639 LIGO Scientific Collaboration and Virgo Collaboration Abbott B P Abbott R Abbott T D Acernese F Ackley K Adams C Adams T Addesso P Adhikari R X Adya V B 28 February 2018 GW170817 Implications for the Stochastic Gravitational Wave Background from Compact Binary Coalescences Physical Review Letters 120 9 091101 arXiv 1710 05837 Bibcode 2018PhRvL 120i1101A doi 10 1103 PhysRevLett 120 091101 PMID 29547330 Abbott B P et al 2016 Observation of Gravitational Waves from a Binary Black Hole Merger Phys Rev Lett 116 6 061102 arXiv 1602 03837 Bibcode 2016PhRvL 116f1102A doi 10 1103 PhysRevLett 116 061102 PMID 26918975 S2CID 124959784 Castelvecchi Davide Witze Alexandra 11 February 2016 Einstein s gravitational waves found at last Nature News doi 10 1038 nature 2016 19361 S2CID 182916902 Retrieved 11 February 2016 External links EditGravitational Wave Experiments and Early Universe Cosmology Retrieved from https en wikipedia org w index php title Gravitational wave background amp oldid 1129849027, wikipedia, wiki, book, books, library,
