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摘要
Einstein's weak equivalence principle (EEP) can be tested through the arrival time delay between photons with different frequencies. Assuming that the arrival time delay is solely caused by the gravitational potential of the Milky Way, we show that a "nano-shot" giant pulse with a time delay between energies corrected for all known effects, e.g., Delta t < 0.4 ns, from the Crab pulsar poses a new upper limit on the deviation from the EEP, i.e., Delta gamma < (0.6-1.8) x 10(-15). This result provides the hitherto most stringent constraint on the EEP, improving by at least 2 to 3 orders of magnitude from the previous results based on fast radio bursts.
- 出版日期2016-11-28
- 单位北京大学
