37 citations · 146 across the 12 of their papers we have counts for
9 papers · 1 filter
Remarks on atmospheric effect of D-foam in light of muon puzzle
Chengyi Li
In our recent paper~[1], we used a stringy model for quantum space-time foam to suggest that the so-induced subluminal Lorentz violation~(LV) for photons would not lead to experime…
Shower formation in the presence of a string-inspired foam in space-time
Chengyi Li
It was recently proposed that predictions of Lorentz-breaking space-time foam models from string theory may be compatible with the suggestion of light-speed variation from gamma-ra…
Probes for String-Inspired Foam, Lorentz, and CPT Violations in Astrophysics
Chengyi Li, Bo-Qiang Ma
Lorentz invariance is such a basic principle in fundamental physics that it must be constantly tested and that any proposal of its violation and breakdown of CPT symmetry, that mig…
Constraints to Lorentz violation and ultrahigh-energy electrons in D-foamy space-times
Chengyi Li, Bo-Qiang Ma
We entertain the constraints that the absence of vacuum Cherenkov radiation of ultrahigh-energy electrons inferred from LHAASO observations of the Crab Nebula can impose on generic…
Lorentz and CPT breaking in gamma-ray burst neutrinos from string theory
Chengyi Li, Bo-Qiang Ma
Previous studies on high-energy gamma-ray burst neutrinos from IceCube suggest a neutrino speed variation at the Lorentz violation~(LV) scale of ~GeV, with…
Lorentz- and CPT-violating neutrinos from string/D-brane model
Chengyi Li, Bo-Qiang Ma
We show that the space-time foam model from string/D-brane theory predicts a scenario in which neutrinos can possess linearly energy dependent speed variation, together with an asy…
LHAASO discovery of highest-energy photons towards new physics
Chengyi Li, Bo-Qiang Ma
Ultrahigh-energy photons up to 1.4 peta-electronvolts have been observed by new cosmic-ray telescope in China -- a hint that Lorentz invariance might break down at the Planck-scale…
Light Speed Variation with Brane/String-Inspired Space-Time Foam
Chengyi Li, Bo-Qiang Ma
Recently a series of studies on high energy gamma-ray burst~(GRB) photons suggest a light speed variation with linear energy dependence at the Lorentz violation scale of $3.6 \time…
Light Speed Variation in a String Theory Model for Space-Time Foam
Chengyi Li, Bo-Qiang Ma
We revisit a supersymmetric string model for space-time foam, in which bosonic open-string states, such as photons, can possess quantum-gravity-induced velocity fluctuations in vac…