3 years ago

# Neutrino Burst-Generated Gravitational Radiation From Collapsing Supermassive Stars.

Chad T. Kishimoto, George M. Fuller, Jung-Tsung Li

We estimate the gravitational radiation signature of the electron/positron annihilation-driven neutrino burst accompanying the asymmetric collapse of an initially hydrostatic, radiation-dominated supermassive object suffering the Feynman-Chandrasekhar instability. An object with a mass $5\times10^4\,M_\odot<M<5\times10^5\,M_\odot$, with primordial metallicity, is an optimal case with respect to the fraction of its rest mass emitted in neutrinos as it collapses to a black hole: lower initial mass objects will be subject to scattering-induced neutrino trapping and consequently lower efficiency in this mode of gravitational radiation generation; while higher masses will not get hot enough to radiate significant neutrino energy before producing a black hole. The optimal case collapse will radiate several percent of the star's rest mass in neutrinos and, with an assumed small asymmetry in temperature at peak neutrino production, produces a characteristic linear memory gravitational wave burst signature. The timescale for this signature, depending on redshift, is $\sim1{\rm~s}$ to $10{\rm~s}$, optimal for proposed gravitational wave observatories like DECIGO. Using the response of that detector, and requiring a signal-to-noise ratio SNR %CONTENT%gt;$5, we estimate that collapse of a$\sim 5\times10^4\,M_\odot$supermassive star could produce a neutrino burst-generated gravitational radiation signature detectable to redshift$z\lesssim7$. With the envisioned ultimate DECIGO design sensitivity, we estimate that the linear memory signal from these events could be detectable with SNR %CONTENT%gt; 5$ to $z \lesssim13$.

Publisher URL: http://arxiv.org/abs/1708.05292

DOI: arXiv:1708.05292v2

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