Zobrazeno 1 - 10
of 609
pro vyhledávání: '"Schneider, Marc P"'
We present a local framework for investigating non-unitary evolution groups pertinent to effective field theories in general semi-classical spacetimes. Our approach is based on a rigorous local stability analysis of the algebra of observables and sol
Externí odkaz:
http://arxiv.org/abs/2408.08348
Analogue Hawking radiation from acoustic horizons is now a well-established phenomenon, both theoretically and experimentally. Its persistence, despite the modified dispersion relations characterising analogue models, has been crucial in advancing ou
Externí odkaz:
http://arxiv.org/abs/2406.14603
Autor:
Schneider, Marc, Herrera, Luis Alberto Garcia, Burger, Birgit, Eisenblätter, Lars, Kühner, Thomas
We report on our latest developments of a planar fiber-chip-coupling scheme, using angle polished, polarization maintaining (PM) fibers. Most integrated photonic chip components are polarization sensitive and a suitable way to launch several waveleng
Externí odkaz:
http://arxiv.org/abs/2301.04927
Autor:
Koegler, Maximilian, Schneider, Marc
We use the hydrogen atom's bound state electron as a probe and investigate the consequences inflicted by time-resolved vacuum effects. Explicitly, we derive a closed form for the time-dependent modification of the Maxwell equations emanating from vac
Externí odkaz:
http://arxiv.org/abs/2209.15020
Publikováno v:
Gen. Relativ.Grav. (2022) 54:45
The big bang and the Schwarzschild singularities are space-like. They are generally regarded as the "final frontiers" at which space-time ends and general relativity breaks down. We review the status of such space-like singularities from three increa
Externí odkaz:
http://arxiv.org/abs/2205.00298
We discuss particle production in spacetimes endowed with a universal horizon in Einstein--Aether and Horava gravity. We argue that continuity and differentiability of the lapse function require the orientation of the foliation in the interior of the
Externí odkaz:
http://arxiv.org/abs/2201.03584
Publikováno v:
Advances in Theoretical and Mathematical Physics, 25, 7, 1651-1702 (2021)
By carrying out a systematic investigation of linear, test quantum fields $\hat{\phi}(x)$ in cosmological space-times, we show that $\hat{\phi}(x)$ remain well-defined across the big bang as operator valued distributions in a large class of Friedmann
Externí odkaz:
http://arxiv.org/abs/2107.08506
Publikováno v:
Phys. Rev. D 104, 125020 (2021)
We adapt the dual-null foliation to the functional Schr\"odinger representation of quantum field theory and study the behavior of quantum probes in plane-wave space-times near the null-singularity. A comparison between the Einstein-Rosen and the Brin
Externí odkaz:
http://arxiv.org/abs/2105.01071
Publikováno v:
Phys. Rev. D 104, 044007 (2021)
We study a self-interacting scalar field theory coupled to gravity and are interested in spherically symmetric solutions with a regular origin surrounded by a horizon. For a scalar potential containing a barrier, and using the most general sphericall
Externí odkaz:
http://arxiv.org/abs/2104.13403
Beamforming methods for sound source localization are usually based on free-field Green's functions to model the sound propagation between source and microphone. This assumption is known to be incorrect for many industrial applications and the beamfo
Externí odkaz:
http://arxiv.org/abs/2010.16140