Results 91 to 100 of about 25,203 (212)

Inspecting absorption in the spectra of extra-galactic gamma-ray sources for insight into Lorentz invariance violation

, 2008
We examine what the absorbed spectra of extra-galactic TeV gamma-ray sources, such as blazars, would look like in the presence of Lorentz invariance violation (LIV).
F. A. Aharonian, G. T. Zatsepin, J. Ellis, J. Ellis, L. Gonzalez-Mestres, P. Kaaret, Tsvi Piran, Uri Jacob   +7 more
core   +1 more source

Quantum GraviElectro Dynamics

Annalen der Physik, Volume 538, Issue 1, January 2026.
The BRST invariant Lagrangian of the gravitationally interacting U(1)$U(1)$ gauge theory, namely the Quantum GraviElectro Dynamics (QGED). The Yan–Mills theory with the Hilbert–Einstein gravitational Lagrangian, namely the Yang–Mills–Utiyama (YMU) theory, is defined and quantised using the standard procedure. The theory is perturbatively renormalisable,
Yoshimasa Kurihara
wiley   +1 more source

Using artificial neural networks in searches for Lorentz invariance violation [PDF]

EPJ Web of Conferences
Lorentz invariance violation (LIV) in gamma rays can have multiple consequences, such as energy-dependent photon group velocity, photon instability, vacuum birefringence, and modified electromagnetic interaction.
Terzić Tomislav
doaj   +1 more source

Threshold analyses and Lorentz violation

, 2003
In the context of threshold investigations of Lorentz violation, we discuss the fundamental principle of coordinate invariance, the role of an effective dynamical framework, and the conditions of positivity and causality.
A. Anisimov, A.R. Frey, C. Adam, C.E. Carlson, D. Bear, D. Colladay, D. Colladay, D. Colladay, D. Colladay, D. Colladay, D. Grumiller, D. Mattingly, D. Sudarsky, D. Sudarsky, D.F. Phillips, F.R. Klinkhamer, F.W. Stecker, G. Amelino-Camelia, G. Amelino-Camelia, G. Amelino-Camelia, G. Amelino-Camelia, G. Amelino-Camelia, G. Diener, G. Diener, G. Feinberg, G. Gabrielse, H. Dehmelt, H. Müller, H. Vankov, J. Alfaro, J. Alfaro, J. Alfaro, J. Lukierski, J. Magueijo, J. Rembielinski, J.A. Lipa, J.M. Link, K. Abe, M.A. Humphrey, M.S. Berger, N. Isgur, O. Bertolami, O. Bertolami, O.W. Greenberg, O.W. Greenberg, R. Ackerstaff, R. Aloisio, R. Bluhm, R. Bluhm, R. Bluhm, R. Bluhm, R. Bluhm, R. Bluhm, R. Jackiw, R. Mittleman, R.C. Myers, Ralf Lehnert, S. Coleman, S.M. Carroll, S.M. Carroll, T. Jacobson, T. Jacobson, T. Kifune, T.J. Konopka, V. Barger, V.A. Kostelecky, V.A. Kostelecký, V.A. Kostelecký, V.A. Kostelecký, V.A. Kostelecký, V.A. Kostelecký, V.A. Kostelecký, V.A. Kostelecký, V.A. Kostelecký, V.A. Kostelecký, V.A. Kostelecký, V.A. Kostelecký, V.A. Kostelecký, V.A. Kostelecký, V.A. Kostelecký, V.A. Kostelecký, V.A. Kostelecký, V.A. Kostelecký, V.A. Kostelecký, V.W. Hughes, W. Kluźniak, W. Pauli, Z. Guralnik   +87 more
core   +1 more source

Quantum Gravity and Lorentz Invariance Violation in the Standard Model [PDF]

Physical Review Letters, 2005
The most important problem of fundamental Physics is the quantization of the gravitational field. A main difficulty is the lack of available experimental tests that discriminate among the theories proposed to quantize gravity. Recently, Lorentz invariance violation by Quantum Gravity(QG) have been the source of a growing interest.
openaire   +6 more sources

Reversal Asymmetry of Reciprocal Metasurface Enables Ultra‐Compact Varifocal Reflective Lens

Laser &Photonics Reviews, Volume 20, Issue 1, 8 January 2026.
The possibility of breaking the reversal symmetry of a lens without violating reciprocity is demonstrated. The freedom provided is utilized to realize an ultra‐compact reflective varifocal lens‐doublet based on a flat metasurface lens and a piezoelectric actuated micromirror.
Christopher A. Dirdal, Jesil Jose, Firehun Tsige Dullo, Grégory Bouquet, Paul C. V. Thrane, Zeljko Skokic, Johannes Skaar   +6 more
wiley   +1 more source

Lorentz Invariance Violation and Modified Hawking Fermions Tunneling Radiation

Advances in High Energy Physics, 2016
Recently the modified Dirac equation with Lorentz invariance violation has been proposed, which would be helpful to resolve some issues in quantum gravity theory and high energy physics.
Shu-Zheng Yang, Kai Lin, Jin Li, Qing-Quan Jiang   +3 more
doaj   +1 more source

Dispersion of light traveling through the interstellar space, induced and intrinsic Lorentz invariance violation

European Physical Journal C: Particles and Fields, 2021
Theoretical models and experimental observations suggest that gamma-ray bursts (GRB) and high-energy neutrino bursts travelling through the interstellar space may reach the Earth at different speeds.
I. Brevik, M. Chaichian, M. Oksanen
doaj   +1 more source

Lorentz Violation in Supersymmetric Field Theories

, 2004
Broken spacetime symmetries might emerge from a fundamental physical theory. The effective low-energy theory might be expected to exhibit violations of supersymmetry and Lorentz invariance. Some illustrative models which combine supersymmetry and Lorentz
Berger, M. S.
core   +2 more sources

No CPT Violation from Tilted Brane in Neutral Meson--Antimeson Systems [PDF]

, 2000
Tilted brane in theories with large compact extra dimensions leads to spontaneous symmetry breaking of the Lorentz and rotational invariance in four dimensions, as shown by Dvali and Shifman.
B. Schwingenheuer, C. S. Kim, D. Colladay, G. Cvetič, G. Dvali, G. Shiu, I. Antoniadis, K. Lee, L. K. Gibbons, N. Arkani-Hamed, R. Bluhm, R. Carosi, S. K. Kang, V. A. Kostelecký   +13 more
core   +2 more sources