Publications related to Lorentz covariance

Models of non-relativistic quantum gravity: the good, the bad and the healthy

Horava's proposal for non-relativistic quantum gravity introduces a preferred time foliation of space-time which violates the local Lorentz invariance. The foliation is encoded in a dynamical scalar field which we call 'khronon'. The dynamics of the khrono ...

2011

Technically natural dark energy from Lorentz breaking

Sergey Sibiryakov, Diego Blas Temino

We construct a model of dark energy with a technically natural small contribution to cosmic acceleration, i.e. this contribution does not receive corrections from other scales in the theory. The proposed acceleration mechanism appears generically in the lo ...

2011

Horava gravity versus thermodynamics: The black hole case

Sergey Sibiryakov, Diego Blas Temino

Under broad assumptions, breaking of Lorentz invariance in gravitational theories leads to tension with unitarity because it allows for processes that apparently violate the second law of thermodynamics. The crucial ingredient of this argument is the exist ...

2011

Relativistic Doppler effect in an extending transmission line: Application to lightning

Marcos Rubinstein, Abdolhamid Shoory

We present in this paper a thorough analysis of current wave propagation with arbitrary speed along an extending transmission line. We derive rigorous analytical equations in the time and frequency domains expressing the reflections of the current wave occ ...

2011

Linearization techniques for band structure calculations in absorbing photonic crystals

Daniel Kressner, Peter Cedric Effenberger

Band structure calculations for photonic crystals require the numerical solution of eigenvalue problems. In this paper, we consider crystals composed of lossy materials with frequency-dependent permittivities. Often, these frequency dependencies are modele ...

2011

Symmetry Elevation and Symmetry Breaking: Keys to Describe and Explain Excitonic Complexes in Semiconductor Quantum Dots

Elyahou Kapon, Alok Rudra, Marc-André Dupertuis, Daniel Oberli

The results of a group theoretical analysis of the excitonic fine structure are presented and compared with spectroscopic data on single quantum dots. The spectral features reveal the signatures of a symmetry higher than the crystal symmetry (C-3v). A cons ...

Amer Inst Physics, 2 Huntington Quadrangle, Ste 1No1 D, Melville, Ny 11747-4501 Usa2011

Consistent Extension of Horava Gravity

Sergey Sibiryakov, Diego Blas Temino

We propose a natural extension of Horava's model for quantum gravity, which is free from the notorious pathologies of the original proposal. The new model endows the scalar graviton mode with a regular quadratic action and remains power-counting renormaliz ...

2010

Phase transition in the localized ferromagnet EuO probed by μSR

Jean-Philippe Ansermet, Arnaud Comment

We report results of muon-spin-rotation measurements performed on the ferromagnetic semiconductor EuO, which is one of the best approximations to a localized ferromagnet. We argue that implanted muons are sensitive to the internal field primarily through a ...

2010

Search for a Lorentz-violating sidereal signal with atmospheric neutrinos in IceCube

Matthias Wolf, Shirit Cohen, Mathieu Ribordy, Xiaoxia Bai

A search for sidereal modulation in the flux of atmospheric muon neutrinos in IceCube was performed. Such a signal could be an indication of Lorentz-violating physics. Neutrino oscillation models, derivable from extensions to the standard model, allow for ...

2010

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Lorentz covariance

Models of non-relativistic quantum gravity: the good, the bad and the healthy

Technically natural dark energy from Lorentz breaking

Horava gravity versus thermodynamics: The black hole case

Relativistic Doppler effect in an extending transmission line: Application to lightning

Linearization techniques for band structure calculations in absorbing photonic crystals

Symmetry Elevation and Symmetry Breaking: Keys to Describe and Explain Excitonic Complexes in Semiconductor Quantum Dots

Polaronic Conductivity in the Photoinduced Phase of 1T-TaS2

Consistent Extension of Horava Gravity

Phase transition in the localized ferromagnet EuO probed by μSR

Search for a Lorentz-violating sidereal signal with atmospheric neutrinos in IceCube

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Models of non-relativistic quantum gravity: the good, the bad and the healthy

Technically natural dark energy from Lorentz breaking

Relativistic Doppler effect in an extending transmission line: Application to lightning

Horava gravity versus thermodynamics: The black hole case

Linearization techniques for band structure calculations in absorbing photonic crystals

Polaronic Conductivity in the Photoinduced Phase of 1T-TaS2

Consistent Extension of Horava Gravity

Phase transition in the localized ferromagnet EuO probed by μSR

Search for a Lorentz-violating sidereal signal with atmospheric neutrinos in IceCube

Symmetry Elevation and Symmetry Breaking: Keys to Describe and Explain Excitonic Complexes in Semiconductor Quantum Dots