Zobrazeno 1 - 10
of 84
pro vyhledávání: '"Brett Altschul"'
Autor:
Sapan Karki, Brett Altschul
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 84, Iss 4, Pp 1-18 (2024)
Abstract In the presence of topologically nontrivial bosonic field configurations, the fermion number operator may take on fractional eigenvalues, because of the existence of zero-energy fermion modes. The simplest examples of this occur in $$1+1$$ 1
Externí odkaz:
https://doaj.org/article/523c83566613486a82f16f0167ff21d1
Autor:
Sapan Karki, Brett Altschul
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 82, Iss 8, Pp 1-12 (2022)
Abstract Effective quantum field theories that allow for the possibility of Lorentz symmetry violation can sometimes also include redundancies of description in their Lagrangians. Explicit calculations in a Lorentz-violating generalization of Yukawa
Externí odkaz:
https://doaj.org/article/22e7384c57b74fc89cdf1bc598ae9a06
Autor:
Harry Oslislo, Brett Altschul
Publikováno v:
Symmetry, Vol 15, Iss 11, p 2042 (2023)
The expectation that the physical expansion of space occurs smoothly may be expressed mathematically as a requirement for continuity in the time derivative of the metric scale factor of the Friedmann–Robertson–Walker cosmology. We explore the con
Externí odkaz:
https://doaj.org/article/4a0fcb33afa645ea86a7de8db2e5fe47
Autor:
Sapan Karki, Brett Altschul
Publikováno v:
Symmetry, Vol 14, Iss 11, p 2326 (2022)
It is known that in Lorentz-violating effective field theory, there is a classical equivalence between certain coefficients (c and f), in spite of the fact that the operators of the two types of coefficients described appear to have opposite behavior
Externí odkaz:
https://doaj.org/article/4a04e2a8c56d469a83c5d4ba9b6b7490
Autor:
Brett Altschul
Publikováno v:
Symmetry, Vol 13, Iss 4, p 688 (2021)
Observations of the synchrotron and inverse Compton emissions from ultrarelativistic electrons in astrophysical sources can reveal a great deal about the energy–momentum relations of those electrons. They can thus be used to place bounds on the pos
Externí odkaz:
https://doaj.org/article/07a2d4172edb4fe885aa1e2c5fb9b40f
Autor:
Karl Schober, Brett Altschul
Publikováno v:
Nuclear Physics B, Vol 910, Iss C, Pp 458-468 (2016)
In a Lorentz- and CPT-violating modification of electrodynamics, the fields of a moving charge are known to have unusual singularities. This raises the question of whether the singular behavior may include δ-function contact terms, similar to those
Externí odkaz:
https://doaj.org/article/b0e88a6c6d974e388d3c483806b0f3a8
Autor:
Richard DeCosta, Brett Altschul
Publikováno v:
Symmetry, Vol 12, Iss 8, p 1312 (2020)
With a number of special Hamiltonians, solutions of the Schrödinger equation may be found by separation of variables in more than one coordinate system. The class of potentials involved includes a number of important examples, including the isotropi
Externí odkaz:
https://doaj.org/article/8db5a32e1cd2439b9dfc5c024a46d600
Autor:
Brett Altschul
Publikováno v:
Symmetry, Vol 9, Iss 11, p 250 (2017)
In a Lorentz-violating quantum field theory, the energy-momentum relations for the field quanta are typically modified. This affects the kinematics, and processes that are normally forbidden may become allowed. One reaction that clearly becomes kinem
Externí odkaz:
https://doaj.org/article/a0d52080848e4e19ab5e39c1d5967053
Autor:
Sapan Karki, Brett Altschul
Publikováno v:
European Physical Journal
Effective quantum field theories that allow for the possibility of Lorentz symmetry violation can sometimes also include redundancies of description in their Lagrangians. Explicit calculations in a Lorentz-violating generalization of Yukawa theory sh
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::17b116e765676742ffd899320b8ee332
http://arxiv.org/abs/2110.08646
http://arxiv.org/abs/2110.08646
Autor:
Sapan Karki, Brett Altschul
Publikováno v:
Physical Review
Lorentz- and CPT-violating models of electrodynamics with Chern-Simons terms are typically plagued by various sorts of instabilities. However, when the Chern-Simons term arises from a slow time variation in a pseudoscalar field with an axion-like ele
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bc694d853ff57c72001138ba7f108f90
https://doi.org/10.1103/physrevd.102.035009
https://doi.org/10.1103/physrevd.102.035009