Zobrazeno 1 - 10
of 74
pro vyhledávání: '"Andreas Aste"'
Autor:
Andreas Aste
Publikováno v:
Symmetry, Vol 6, Iss 4, Pp 1037-1057 (2014)
Fundamental problems of quantum field theory related to the representation problem of canonical commutation relations are discussed within a gauge field version of a van Hove-type model. The Coulomb field generated by a static charge distribution is
Externí odkaz:
https://doaj.org/article/8a0cd58287f94308b0c2674db5cc0fe9
Autor:
Andreas Aste
Publikováno v:
Symmetry, Vol 2, Iss 4, Pp 1776-1809 (2010)
A concise discussion of spin-1/2 field equations with a special focus on Majorana spinors is presented. The Majorana formalism which describes massive neutral fermions by the help of two-component or four-component spinors is of fundamental importanc
Externí odkaz:
https://doaj.org/article/0ca620c0a9b64e3585143668967a7f4b
Autor:
Andreas Aste
Publikováno v:
Symmetry, Vol 8, Iss 9, p 87 (2016)
A self-contained derivation of the formalism describing Weyl, Majorana and Dirac fields from a unified perspective is given based on a concise description of the representation theory of the proper orthochronous Lorentz group. Lagrangian methods play
Externí odkaz:
https://doaj.org/article/e98f72fb830d478e81332cb391117a17
Autor:
Won Sang Chung, Andreas Aste
Publikováno v:
Advanced Studies in Theoretical Physics. 10:125-133
A simple exposition of the rarely discussed fact that a set of free boson fields describing different, i.e. kinematically different particle types can be quantized with mutual anticommutation relations is given by the explicit construction of the Kle
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fabb59d986907b13f5f79597ab74edf5
https://doi.org/10.12988/astp.2016.512116
https://doi.org/10.12988/astp.2016.512116
Autor:
Andreas Aste
Publikováno v:
Nuclear Physics A. 806:191-215
The influence of the Coulomb distortion for quasi-elastic (e,e') scattering on highly charged nuclei is investigated in distorted wave Born approximation for electrons. The Dirac equation is solved numerically in order to obtain exact electron contin
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::806ceaf2034235e97e681f4e7dfdf174
https://doi.org/10.1016/j.nuclphysa.2008.03.011
https://doi.org/10.1016/j.nuclphysa.2008.03.011
Autor:
Andreas Aste
Publikováno v:
Letters in Mathematical Physics. 78:157-172
The massless one-loop vertex diagram is constructed by exploiting the causal structure of the diagram in configuration space, which can be translated directly into dispersive relations in momentum space.
14 pages, LATEX with style file, correspo
14 pages, LATEX with style file, correspo
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5bad9e07c918b9122414dfb1340d4c62
https://doi.org/10.1007/s11005-006-0113-3
https://doi.org/10.1007/s11005-006-0113-3
Autor:
Andreas Aste
Publikováno v:
Letters in Mathematical Physics. 77:209-218
The massless sunrise diagram with an arbitrary number of loops is calculated in a simple but formal manner. The result is then verified by rigorous mathematical treatment. Pitfalls in the calculation with distributions are highlighted and explained.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f677422d9428554e4d1a5b45cfca30ff
https://doi.org/10.1007/s11005-006-0090-6
https://doi.org/10.1007/s11005-006-0090-6
Autor:
Andreas Aste
Publikováno v:
Canadian Journal of Physics. 83:139-163
A condensed introduction to quantum gauge theories is given in the perturbative S-matrix framework; path integral methods are used nowhere. This approach emphasizes the fact that it is not necessary to start from classical gauge theories which are th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9bc12b4bfd81cde2128896b8a25dab90
https://doi.org/10.1139/p04-064
https://doi.org/10.1139/p04-064
Autor:
Andreas Aste
Publikováno v:
Europhysics Letters (EPL). 69:36-40
A simplified derivation of Yurtsever's result, which states that the entropy of a truncated bosonic Fock space is given by a holographic bound when the energy of the Fock states is constrained gravitationally, is given for asymptotically flat spaceti
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::42467fbd100abf8713ab51cde1b1b7c4
https://doi.org/10.1209/epl/i2004-10317-0
https://doi.org/10.1209/epl/i2004-10317-0