37 citations · 146 across the 12 of their papers we have counts for
12 papers
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…
Effects on neutrino propagation in space-time foam of D-branes revisited
Chengyi Li, Bo-Qiang Ma
Neutrinos from the cosmos have proven to be ideal for probing the nature of space-time. Previous studies on high-energy events of IceCube suggested that some of these events might…
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…
Testing Lorentz invariance of electrons with LHAASO observations of PeV gamma-rays from the Crab Nebula
Chengyi Li, Bo-Qiang Ma
The Large High Altitude Air Shower Observatory~(LHAASO) recently reported the detection of gamma-ray emissions with energies up to from the Crab Nebula. Using th…
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…
Ultrahigh-energy photons from LHAASO as probes of Lorentz symmetry violations
Chengyi Li, Bo-Qiang Ma
The Large High Altitude Air Shower Observatory~(LHAASO) is one of the most sensitive gamma-ray detector arrays currently operating at TeV and PeV energies. Recently the LHAASO expe…
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…