Zobrazeno 1 - 10
of 3 786
pro vyhledávání: '"Ion, I"'
Autor:
Cotaescu, Ion I.
Models of evaporating black holes are constructed using the new solutions of Einstein's equations with perfect fluid in space-times with FLRW asymptotic behaviour derived recently [I. I. Cotaescu, Eur. Phys. J. C (2022) 82:86]. The dynamics of these
Externí odkaz:
http://arxiv.org/abs/2411.15258
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
Autor:
Cotaescu, Ion I.
Publikováno v:
Eur. Phys. J. C (2024) 84:819
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 generalizing thus the models proposed recently in [I. I. Cot\u ae
Externí odkaz:
http://arxiv.org/abs/2408.06389
Autor:
Dinca, Ion I.
We provide the B\"{a}cklund transforms of Peterson's isometric deformations of diagonal higher dimensional quadrics without center. These are found explicitly. can be iterated via the Bianchi Permutability Theorem and can be further iterated via the
Externí odkaz:
http://arxiv.org/abs/2308.08826
Autor:
Cotaescu, Ion I.
New conserved spin and orbital angular momentum operators of Dirac's theory on spatially flat FLRW spacetimes are proposed generalizing thus recent results concerning the role of Pryce's spin operator in the flat case [I. I. Cot\u aescu, Eur. Phys. J
Externí odkaz:
http://arxiv.org/abs/2308.05781
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:
Cotaescu, Ion I.
Publikováno v:
Chinese Physics C Vol. 48, No. 12 (2024) 123106
The Pryce (e) spin and position operators of the quantum theory of Dirac's free field were re-defined and studied recently with the help of a new spin symmetry and suitable spectral representations [I. I. Cot\u aescu, Eur. Phys. J. C (2022) 82:1073].
Externí odkaz:
http://arxiv.org/abs/2304.12182
Publikováno v:
Advances in Electrical and Computer Engineering, Vol 10, Iss 2, Pp 145-152 (2010)
The paper presents ZPM dynamic control of walking robots, developing an open architecture real time control multiprocessor system, in view of obtaining new capabilities for walking robots. The complexity of the movement mechanism of a walking robot w
Externí odkaz:
https://doaj.org/article/2aa4027637c146dd8ac10e2399f8881c