http://arxiv.org/abs/1612.00717
The Einstein’s Equivalent Principle can be tested through the parameterized post-Newtonian parameters, such as the parameter $\gamma$, denoting how much space curvature is produced by unit rest mass. The parameter $\gamma$ has been constrained by comparing time delays of correlated particles or photons from extragalactic transient sources, like supernova, gamma-ray bursts, etc. The best constraint of $\gamma$ has been obtained by the time delay between two radio bands, which gives $\gamma (1.23 \mbox{GHz})-\gamma(1.45 \mbox{GHz}) < 4.36 \times 10^{-9}$. In this letter, $\gamma$ is constrained by the timing of the Crab Pulsar from radio, optical, X-ray and $\gamma$-ray bands as follows: $\gamma_{radio} – \gamma_{optical} < 2.63 \times 10^{-9}$, $\gamma_{radio} – \gamma_{X-ray} < 4.01 \times 10^{-9}$, and $\gamma_{radio} – \gamma_{\gamma-ray} < 3.28 \times 10^{-9}$. The new result sets the most stringent constraint on $\gamma$ up to date. The Einstein’s Equivalent Principle is thus tested at a region much closer to us than those transient sources, through the timing of a stable source having been observed extensively.
Y. Zhang and B. Gong
Mon, 5 Dec 16
58/61
Comments: 4 pages. arXiv admin note: text overlap with arXiv:1512.07670 by other authors
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