What question did this study set out to answer?

This research aims to understand the gravitational wave signature resulting from the fragmentation of a scalar field under a tachyonic potential.

June 18, 2026Open Access

GravitationalWavesfromScalarFieldFragmentation: UVSlopeasanObservableDiscriminator

Key Points

This research aims to understand the gravitational wave signature resulting from the fragmentation of a scalar field under a tachyonic potential.
Conducted 1D numerical simulations
Applied Hartree approximation
Analyzed characteristics of generated gravitational wave background
The tachyonic instability leads to exponential growth of fluctuations, resulting in localized field configurations.
Gravitational wave background has an ultraviolet slope of ΩGW(f)∝f−n with n ≃ 2−3, differentiating it from other sources.
The signal is predicted to be detectable by LISA, Einstein Telescope, and DECIGO across various model parameters.

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.

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Cite This Study

Alik Gimranov (Tue,) studied this question.

synapsesocial.com/papers/6a338db6630953a74978e93f https://doi.org/https://doi.org/10.5281/zenodo.20719134

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