5 papers
Overlapping resonance branches of a gauge-invariant Lorentz-violating massive vector
Zurab Kepuladze
We investigate the propagation and resonance behavior of an Abelian massive vector field in the presence of a gauge-invariant, CPT-even, dimension-four Lorentz-violating kinetic op…
Lorentz-Violating Photon Decay into Neutrinos and Constraints from PeV Photon Stability
Zurab Kepuladze
We study the vacuum decay of a Lorentz-violating photon into a neutrino-antineutrino pair. Lorentz-violating corrections to the photon dispersion relation are parametrized through…
Unavoidable Loop-Induced Quintessence -- Higgs Mixing and Its Phenomenological Consequences
Zurab Kepuladze
We investigate a class of quintessence models in which the dark-energy scalar field interacts with sterile neutrinos responsible for neutrino mass generation through the seesaw mec…
Lorentz Violation: Loop-Induced Effects in QED and Observational Constraints
Zurab Kepuladze
Lorentz invariance is a cornerstone of modern physics, yet its possible violation remains both theoretically intriguing and experimentally significant. In this work, using quantum…
Probing Lorentz Invariance Violation in Z Boson Mass Measurements at High-Energy Colliders
Juansher Jejelava, Zurab Kepuladze
We propose a minimal extension to the Standard Model by introducing a Lorentz Invariance Violation (LIV) term into the Z boson's dispersion relation, expressed as $p_μp^μ= M_Z^2…