GravitationalWavesfromScalarFieldFragmentation: UVSlopeasanObservableDiscriminator
Year: 2026
Type: article
Abstract: We study the fragmentationof a scalarfieldT(x)witha tachyonicpotential and its gravitationalwave (GW) signature. Using1Dnumerical simulationsandtheHartreeap proximation,wedemonstratethat thetachyonic instabilityleads toexponential growthof fluctuations, followedbynonlinearsaturationandformationof localizedfieldconfigurations (lumps). This fragmentationprocessgeneratesastochasticgravitationalwavebackground withacharacteristicultravioletslopeΩGW(f)∝f−nwithn≃2−3,whichdistinguishes it fromfirst-orderphasetransitions(n∼1)andturbulence-drivensources(n∼5/3).We providesemi-analyticestimatesfortheGWamplitudeandfrequency,andshowthatthesig nalcanbedetectablebyLISA,EinsteinTelescope,andDECIGOforawiderangeofmodel parameters. TheUVslope serves as anobservablediscriminator for futuregravitational wavedetectors.
Author: Gimranov, Alik
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7164878385
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