Zobrazeno 1 - 10
of 98
pro vyhledávání: '"Ahmadiniaz, N."'
Autor:
Ahmadiniaz, N., Bähtz, C., Benediktovitch, A., Bömer, C., Bocklage, L., Cowan, T. E., Edwards, J., Evans, S., Viñas, S. Franchino, Gies, H., Göde, S., Görs, J., Grenzer, J., Acosta, U. Hernandez, Heinzl, T., Hilz, P., Hippler, W., Huang, L. G., Humphries, O., Karbstein, F., Khademi, P., King, B., Kluge, T., Kohlfürst, C., Krebs, D., Laso-García, A., Lötzsch, R., Macleod, A. J., Marx-Glowna, B., Mosman, E. A., Nakatsutsumi, M., Paulus, G. G., Rahul, S. V., Randolph, L., Röhlsberger, R., Rohringer, N., Sävert, A., Sadashivaiah, S., Sauerbrey, R., Schlenvoigt, H. -P., Schmidt, S. M., Schramm, U., Schützhold, R., Schwinkendorf, J. -P., Seipt, D., Šmíd, M., Stöhlker, T., Toncian, T., Valialshchikov, M., Wipf, A., Zastrau, U., Zepf, M.
Quantum field theory predicts a nonlinear response of the vacuum to strong electromagnetic fields of macroscopic extent. This fundamental tenet has remained experimentally challenging and is yet to be tested in the laboratory. A particularly distinct
Externí odkaz:
http://arxiv.org/abs/2405.18063
Autor:
Ahmadiniaz, N., Cowan, T. E., Ding, M., Lopez, M. A. Lopez, Sauerbrey, R., Shaisultanov, R., Schützhold, R.
Motivated by experimental initiatives such as the Helmholtz International Beamline for Extreme Fields (HIBEF), we study Compton scattering of x-rays at electrons in a strong external field (e.g., a strong optical laser) with special emphasis on the p
Externí odkaz:
http://arxiv.org/abs/2212.03350
Autor:
Ahmadiniaz, N., Cowan, T. E., Grenzer, J., Franchino-Viñas, S., Garcia, A. Laso, Šmíd, M., Toncian, T., Trejo, M. A., Schützhold, R.
Motivated by recent experimental initiatives, such as at the Helmholtz International Beamline for Extreme Fields (HIBEF) at the European X-ray Free Electron Laser (XFEL), we calculate the birefringent scattering of x-rays at the combined field of two
Externí odkaz:
http://arxiv.org/abs/2208.14215
We consider local semitransparent Neumann boundary conditions for a quantum scalar field as imposed by a quadratic coupling to a source localized on a flat codimension-one surface. Upon a proper regularization to give meaning to the interaction, we i
Externí odkaz:
http://arxiv.org/abs/2208.07383
Publikováno v:
Phys. Rev. Research 4, L032045 (2022)
We investigate whether and how the quantum Zeno effect, i.e., the inhibition of quantum evolution by frequent measurements, can be employed to isolate a quantum dot from its surrounding electron reservoir. In contrast to the often studied case of tun
Externí odkaz:
http://arxiv.org/abs/2201.11718
Publikováno v:
Phys. Rev. D 104, 011902 (2021)
We consider the scattering of an x-ray free-electron laser (XFEL) beam on the superposition of a strong magnetic field $\bf{B}_{\rm ext}$ with the Coulomb field $\bf{E}_{\rm ext}$ of a nucleus with charge number $Z$. In contrast to pure Delbr\"uck sc
Externí odkaz:
http://arxiv.org/abs/2012.04484
Autor:
Ahmadiniaz, N., Cowan, T. E., Sauerbrey, R., Schramm, U., Schlenvoigt, H. -P., Schützhold, R.
Publikováno v:
Phys. Rev. D 101, 116019 (2020)
Quantum electrodynamics predicts the vacuum to behave as a non-linear medium, including effects such as birefringence. However, for experimentally available field strengths, this vacuum polarizability is extremely small and thus very hard to measure.
Externí odkaz:
http://arxiv.org/abs/2003.10519
We briefly discuss the recent discovery of reducible contributions to QED effective actions due to the presence of external electromagnetic fields at tree level and higher loop-order. We classify the physical effects of these contributions for variou
Externí odkaz:
http://arxiv.org/abs/2003.02508
An interesting class of background field configurations in QED are the O(2)xO(3) symmetric fields. Those backgrounds have some instanton-like properties and yield a one-loop effective action that is highly nontrivial but amenable to numerical calcula
Externí odkaz:
http://arxiv.org/abs/1301.5669
Autor:
Ahmadiniaz, N., Schubert, C.
The three-gluon vertex is a basic object of interest in nonabelian gauge theory. It contains important structural information, in particular on infrared divergences, and also figures prominently in the Schwinger-Dyson equations. At the one-loop level
Externí odkaz:
http://arxiv.org/abs/1206.1843