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Strongest gravitational waves from neutrino oscillations at supernova core bounce | | Herman J. Mosquera Cuesta
; Karen Fiuza
; | | Date: |
22 Mar 2004 | | Journal: | Eur.Phys.J. C35 (2004) 543-554 | | Subject: | astro-ph | | Abstract: | Resonant active-to-active ($
u_a o
u_a$), as well as active-to-sterile ($
u_a o
u_s$) neutrino ($
u$) oscillations can take place during the core bounce of a supernova collapse. Besides, over this phase, weak magnetism increases antineutrino ($ar{
u}$) mean free paths, and thus its luminosity. Because the oscillation feeds mass-energy into the target $
u$ species, the large mass-squared difference between species ($
u_a o
u_s$) implies a huge amount of energy to be given off as gravitational waves ($L_{ extrm{GWs}} sim 10^{49}$ erg s$^{-1}$), due to anisotropic but coherent $
u$ flow over the oscillation length. This asymmetric $
u$-flux is driven by both the spin-magnetic and the {it universal spin-rotation} coupling. The novel contribution of this paper stems from 1) the new computation of the anisotropy parameter $alpha sim 0.1-0.01$, and 2) the use of the tight constraints from neutrino experiments as SNO and KamLAND, and the cosmic probe WMAP, to compute the gravitational-wave emission during neutrino oscillations in supernovae core collapse and bounce. We show that the mass of the sterile neutrino $
u_s$ that can be resonantly produced during the flavor conversions makes it a good candidate for dark matter as suggested by Fuller et {it al.} (2003). The new spacetime strain thus estimated is still several orders of magnitude larger than those from $
u$ difussion (convection and cooling) or quadrupole moments of neutron star matter. This new feature turns these bursts the more promissing supernova gravitational-wave signal that may be detected by observatories as LIGO, VIRGO, etc., for distances far out to the VIRGO cluster of galaxies. | | Source: | arXiv, astro-ph/0403529 | | Services: | Forum | Review | PDF | Favorites | |
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