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138 papers · 1 filter
Even the photon propagator must break de Sitter symmetry
Dražen Glavan, Tomislav Prokopec
The propagator for the massless vector field in de Sitter space cannot maintain de Sitter invariance in the general covaraint gauge, except in the exactly transverse gauge limit. T…
Photon propagator in de Sitter space in the general covariant gauge
Dražen Glavan, Tomislav Prokopec
We consider a free photon field in -dimensional de Sitter space, and construct its propagator in the general covariant gauge. Canonical quantization is employed to define the sy…
Stochastic particle creation: from the dynamical Casimir effect to cosmology
Matías Mantiñan, Francisco D. Mazzitelli, Leonardo G. Trombetta
We study a stochastic version of the dynamical Casimir effect, computing the particle creation inside a cavity produced by a random motion of one of its walls. We first present a c…
Theory of superdiffusive spin transport in noncollinear magnetic multilayers
Pavel Baláž, Maciej Zwierzycki, Francesco Cosco +3
Ultrafast demagnetization induced by femtosecond laser pulses in thin metallic layers is caused by the outflow of spin-polarized hot electron currents describable by the superdiffu…
Metallic water: transient state under ultrafast electronic excitation
Nikita Medvedev, Roman Voronkov, Alexander E. Volkov
The modern means of controlled irradiation by femtosecond lasers or swift heavy ion beams can transiently produce such energy densities in samples that reach collective electronic…
Needs, trends, and advances in scintillators for radiographic imaging and tomography
Zhehui Wang, Christophe Dujardin, Matthew S. Freeman +17
Scintillators are important materials for radiographic imaging and tomography (RadIT), when ionizing radiations are used to reveal internal structures of materials. Since its inven…