http://arxiv.org/abs/1604.06668
In this paper, we test Einstein’s equivalence principle (EEP) about gravitational wave transient GW150914 associated with weak electromagnetic signal GW150914-GBM observed by Gamma-ray Burst Monitor (GBM). We study the differences of parametrized post Newtonian (PPN) parameter $\gamma$ between different particles in LIGO and GBM including the initial outburst gravitons and photons, the gravitons with frequency from 35 to 250 Hz and the photons in hard X-ray emission between 1 KeV and 10 MeV. The calculations are performed on the possible localizations of GW150914 which contains a best fit localization with $68\%$ statistical uncertainty region over 9000 square degrees and the 11 sky locations with $5^{\circ}$ apart on LIGO localization arc being visible to GBM. The results show that the violation of EEP, at least on the order of magnitude, is quite insensitive to the location of source. The initial outburst gravitons give us a very tight constrain on the violation of EEP and the accuracy is up to at least $10^{-10}$ with millisecond order time delay. The EEP violation between gravitons and photons is also up to the order of $10^{-8}$ which is about 3 orders of magnitude tighter than recent PeV neutrino and gamma ray photons from blazar flares, and also is 5 orders of magnitude tighter than previous result of MeV neutrinos from SN1987A.
M. Liu, Z. Zhao, X. You, et. al.
Mon, 25 Apr 16
4/40
Comments: 5 pages, 3 figures
You must be logged in to post a comment.