The problem of describing the quantum behavior of gravity, and thus understanding
quantum spacetime, is still open. Loop quantum gravity is a well-developed approach to this …

Motivated by ideas about quantum gravity, a tremendous amount of effort over the past
decade has gone into testing Lorentz invariance in various regimes. This review …

THE LARGE AREA TELESCOPE ON THE FERMI GAMMA-RAY SPACE TELESCOPE
MISSION - IOPscience Skip to content IOP Science home Accessibility Help Search Journals …

The hypothesis that the Lorentz transformations may be modified at Planck scale energies is
further explored. We present a general formalism for theories which preserve the relativity of …

Quantum gravity is expected to be necessary in order to understand situations in which
classical general relativity breaks down. In particular in cosmology one has to deal with …

The behavior of photons in the presence of Lorentz and CPT violation is studied. Allowing
for operators of arbitrary mass dimension, we classify all gauge-invariant Lorentz-and CPT …

The existence of a fundamental ultraviolet scale, such as the Planck scale, may lead to
modifications of the dispersion relations for particles at high energies in some scenarios of …

On 9 October 2022, the Large High Altitude Air Shower Observatory (LHAASO) reported the
observation of the very early TeV afterglow of the brightest-of-all-time gamma-ray burst …

We have measured the frequency of the extremely narrow 1 S-2 S two-photon transition in
atomic hydrogen using a remote cesium fountain clock with the help of a 920 km stabilized …

The Lorentz symmetry of gravity is spontaneously broken when the nonminimally coupled
Kalb-Ramond field acquires a nonzero vacuum expectation value. In this work, we present …