Zobrazeno 1 - 10
of 3 856
pro vyhledávání: '"Ion I"'
Autor:
Ion I. Cotăescu
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 84, Iss 8, Pp 1-8 (2024)
Abstract New one-parameter models of non-rotating dynamical particles are derived as isotropic solutions of Einstein’s equations with perfect fluid in space-times with FLRW asymptotic behaviour, thus generalizing the models recently proposed by Cot
Externí odkaz:
https://doaj.org/article/c389a4c74aff4f74a97adb5a2dd5c489
Autor:
Ion I. Cotăescu
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 84, Iss 5, Pp 1-13 (2024)
Abstract New conserved spin and orbital angular momentum operators of Dirac’s theory on spatially flat FLRW space-times are proposed generalizing thus the recent results concerning the role of Pryce’s spin operator in the flat case (Cotăescu in
Externí odkaz:
https://doaj.org/article/a5881bd57afd43d3879fa961423ff43c
Autor:
Ion I. Cotăescu, Ion Cotăescu
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 83, Iss 10, Pp 1-10 (2023)
Abstract The discrete symmetries of Dirac’s free field on the de Sitter manifold are studied, taking into account that this has two portions that can play the role of physical space-times, namely an expanding and a collapsing universe. The proper d
Externí odkaz:
https://doaj.org/article/cb4f40d0bcb04db5bcd30a35d60f9d45
Autor:
Ion I. Cotăescu
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 82, Iss 11, Pp 1-16 (2022)
Abstract It is shown that the components of Pryce’s spin operator of Dirac’s theory are SU(2) generators of a representation carried by the space of Pauli’s spinors determining the polarization of the plane wave solutions of Dirac’s equation.
Externí odkaz:
https://doaj.org/article/3fef3e38172f4f26b55499b0a493058e
Autor:
Ion I. Cotăescu
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 82, Iss 8, Pp 1-15 (2022)
Abstract The processes in the first order of perturbations of de Sitter quantum electrodynamics (QED) in Coulomb gauge are studied but setting our recently proposed rest frame vacuum of the Dirac field instead of the traditional adiabatic one. This v
Externí odkaz:
https://doaj.org/article/5526ffcd61dc4645bfa9653f7e7ebb5e
Autor:
Ion I. Cotăescu
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 82, Iss 1, Pp 1-10 (2022)
Abstract The propagation of the packets of left-handed plane wave solutions of the massless Dirac equation is studied in spatially flat Friedmann–Lemaître–Robertson–Walker (FLRW) space-times. Assuming that the observations are performed in phy
Externí odkaz:
https://doaj.org/article/df26c59dd820457ab02e7accd0e13f05
Autor:
Ion I. Cotăescu
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 82, Iss 1, Pp 1-9 (2022)
Abstract Metrics of dynamical point particles embedded in spatially flat FLRW space-times are derived as isotropic solutions of the Einstein equations with the energy–momentum tensor of a perfect fluid. These particles are produced by central singu
Externí odkaz:
https://doaj.org/article/78a1262cfe744ab9b8b7d44c86a36de2
Autor:
Hakimeh Ebrahimi-Nik, Marmar Moussa, Ryan P. Englander, Summit Singhaviranon, Justine Michaux, HuiSong Pak, Hiroko Miyadera, William L. Corwin, Grant L. J. Keller, Adam T. Hagymasi, Tatiana V. Shcheglova, George Coukos, Brian M. Baker, Ion I. Mandoiu, Michal Bassani-Sternberg, Pramod K. Srivastava
Publikováno v:
Nature Communications, Vol 12, Iss 1, Pp 1-11 (2021)
The immunogenicity of peptides is believed to be determined by their high-affinity binding to MHC I. Here authors show that low-affinity MHC I-peptide interactions are also able to trigger robust T cell response and anti-tumour immunity in vivo.
Externí odkaz:
https://doaj.org/article/1e4f015d0d0f4721934a300013d3a61f
Autor:
Ion I. Cotăescu
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 81, Iss 10, Pp 1-20 (2021)
Abstract The classical and quantum theory of the Maxwell free field (or perturbation) minimally coupled to the gravity of local-Minkowskian spatially flat Friedmann–Lemaître–Robertson–Walker (FLRW) space-times is constructed in conformal local
Externí odkaz:
https://doaj.org/article/30efaaf4f0a845798cabb9ee5a9d37dd
Autor:
Dinca, Ion I.
We prove that a generic $4$-dimensional integrable rolling distribution of contact elements with the symmetry of the tangency configuration (excluding developable seed and isotropic developable leaves) splits into an $1$-dimensional family of generic
Externí odkaz:
http://arxiv.org/abs/2410.01135
