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Dark radiation as a probe for phase transition in the early universe
Zihang Wang, Lijing Shao
The cosmological constant is not necessarily small in the early universe. If a scalar field obtains a vacuum expectation value after a phase transition (PT), a possibly large cosmo…
Axion induced spin effective couplings
Zihang Wang, Lijing Shao
Detecting axionic dark matter induced electron or nucleon oscillating electric dipole moment (OEDM) has become a new way for dark matter searches. We re-examine such axion-spin cou…
Resonant instability of axionic dark matter clumps
Z. Wang, L. Shao, L. -X. Li
Axion is a popular candidate for dark matter particles. Axionic dark matter may form Bose-Einstein condensate and may be gravitationally bound to form axion clumps. Under the prese…
Combined search for anisotropic birefringence in the gravitational-wave transient catalog GWTC-1
Lijing Shao
The discovery of gravitational waves (GWs) provides an unprecedented arena to test general relativity, including the gravitational Lorentz invariance violation (gLIV). In the propa…
Lorentz-violating matter-gravity couplings in small-eccentricity binary pulsars
Lijing Shao
Lorentz symmetry is an important concept in modern physics. Precision pulsar timing was used to put tight constraints on the coefficients for Lorentz violation in the pure-gravity…
Testing fifth forces from the Galactic dark matter
Lijing Shao
Is there an unknown long-range force between dark matter (DM) and ordinary matters? When such a fifth force exists and in the case that it is ignored, the equivalence principle (EP…
The CPT-violating effects on neutron's gravitational bound state
Zhi Xiao
Analytical solutions with effective CPT-violating spin--gravity corrections to the neutron's gravitational bound states are obtained. The helicity-dependent phase evolution due to…
The CPT-violating effects on neutrons' gravitational bound state
Zhi Xiao, Lijing Shao
In this work, the CPT-violating (CPTV) interactions on neutrons' gravitational bound state are studied. With simple analytical solutions, we provide a preliminary investigation on…
A Bayesian Framework to Constrain the Photon Mass with a Catalog of Fast Radio Bursts
Lijing Shao, Bing Zhang
A hypothetical photon mass, , gives an energy-dependent light speed in a Lorentz-invariant theory. Such a modification causes an additional time delay between photons of diffe…
Octet Quark Contents from SU(3) Flavor Symmetry
Haitao Liu, Yujie Chi, Lijing Shao +1
With the parametrization of parton distribution functions (PDFs) of the proton by Soffer \textit{et al.}, we extend the valence quark contents to other octet baryons by utilizing S…
Parton distribution functions and nuclear EMC effect in a statistical model
Lijing Shao, Yunhua Zhang, Bo-Qiang Ma
A new and simple statistical approach is performed to calculate the parton distribution functions (PDFs) of the nucleon in terms of light-front kinematic variables. Analytic expres…
Lorentz violation effects on astrophysical propagation of very high energy photons
Lijing Shao, Bo-Qiang Ma
Lorentz violation (LV) is predicted by some quantum gravity (QG) candidates, wherein the canonical energy-momentum dispersion relation, , is modified. Consequently, ne…
First Digit Distribution of Hadron Full Width
Lijing Shao, Bo-Qiang Ma
A phenomenological law, called Benford's law, states that the occurrence of the first digit, i.e., , of numbers from many real world sources is not uniformly distributed…
Sea quark contents of octet baryons
Lijing Shao, Yong-Jun Zhang, Bo-Qiang Ma
The flavor asymmetry of the nucleon sea, i.e., the excess of quark-antiquark pairs over ones in the proton can be explained by several different models; there…
Lorentz violation from cosmological objects with very high energy photon emissions
Lijing Shao, Zhi Xiao, Bo-Qiang Ma
Lorentz violation (LV) is predicted by some quantum gravity theories, where photon dispersion relation is modified, and the speed of light becomes energy-dependent. Consequently, i…
Statistical effect in the parton distribution functions of the nucleon
Yunhua Zhang, Lijing Shao, Bo-Qiang Ma
A new and simple statistical approach is performed to calculate the parton distribution functions (PDFs) of the nucleon in terms of light-front kinematic variables. We do not put i…