Kavli Affiliate: Lijing Shao
| First 5 Authors: Yiming Dong, Ziming Wang, Lijing Shao, ,
| Summary:
Lorentz Violation (LV) is posited as a possible relic effect of quantum
gravity at low energy scales. The Standard-Model Extension provides an
effective field-theoretic framework for examining possible deviations
attributed to LV. With their high observational accuracy, pulsars serve as
ideal laboratories for probing LV. In the presence of LV, both the spin
precession of solitary pulsars and orbital dynamics of binary pulsars would
undergo modifications. Observations of pulse profiles and times of arrival
(TOAs) of pulses allow for an in-depth investigation of these effects, leading
to the establishment of strict limits on LV coefficients. We revisit the
project of limiting local LV with updated pulsar observations. We employ a new
parameter estimation method and utilize state-of-the-art pulsar timing
observation data and get new limits on 8 linear combinations of LV coefficients
based on 25 tests from 12 different systems. Compared to previous limits from
pulsars, precision has improved by a factor of two to three. Additionally, we
explore prospects for further improvements from pulsars. Simulation results
indicate that more observations of spin precession in solitary millisecond
pulsars could significantly enhance the accuracy of spatial LV coefficients,
potentially by three to four orders of magnitude. As observational data
accumulate, pulsars are anticipated to increasingly contribute to the tests of
LV.
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