Zobrazeno 1 - 10
of 7 468
pro vyhledávání: '"Akhmedov AT"'
We start with the consideration of the loop effects for light fields with non-zero mass in the expanding Poincar\'e patch of de Sitter space-time. We derive the Dyson-Schwinger equation, which sums up the leading infrared (growing with time) loop cor
Externí odkaz:
http://arxiv.org/abs/2411.11106
We consider two approaches to calculate imaginary parts of effective actions in expanding space-times. While the first approach uses Bogolyubov coefficients, the second one uses the functional integral or the Feynman propagator. In eternally expandin
Externí odkaz:
http://arxiv.org/abs/2411.02170
Autor:
Akhmedov, Evgeny
Finding out if neutrinos are Dirac or Majorana particles is known to be extremely difficult. This is generally believed to be due to the smallness of the neutrino mass compared to typical neutrino energies, and to the fact that in the limit of vanish
Externí odkaz:
http://arxiv.org/abs/2410.11940
Autor:
Akhmedov, E. T., Kazarnovskii, K. A.
There are two ways to quantize free (gaussian) theory in strong background fields. In one of them, which we refer to as the Heisenberg approach, the mode functions are defined once and for entire space-time. In this approach there is no any apparent
Externí odkaz:
http://arxiv.org/abs/2410.05108
Autor:
Akhmedov, E. T., Zavgorodny, P. S.
The Schwinger's current appearing due to the breakdown of the vacuum in the strong constant electric pulse background is well known and calculated in many places. It appears due to the amplification of the zero-point fluctuations. However, we find th
Externí odkaz:
http://arxiv.org/abs/2409.00684
Autor:
Akhmedov, Azer, Ismailov, Vugar
In this paper we discuss the problem of interpolation on straight lines by linear combinations of ridge functions with fixed directions. By using some geometry and/or systems of linear equations, we constructively prove that it is impossible to inter
Externí odkaz:
http://arxiv.org/abs/2408.06443
We use different methods to calculate the imaginary part of the gravitational effective action due to a massless scalar field, with a view on perturbative vs. non-pertubative and the results of ArXiv:2305.18521.
Comment: 9 pages
Comment: 9 pages
Externí odkaz:
http://arxiv.org/abs/2407.06601
Autor:
Akhmedov, Azer
We produce an example of an irreducible discrete subgroup in the product $SL(2,\R)\times SL(2,\R)$ which is not a lattice. This answers a question asked in [15].
Externí odkaz:
http://arxiv.org/abs/2406.12107
Autor:
Akhmedov, Evgeny, Pospelov, Maxim
We consider primordial nucleosynthesis in the presence of hypothetical quasi-stable doubly charged particles. Existence of $X^{--}$ with macroscopic lifetimes will lead to the formation of its bound states with $^4$He and other light elements, signif
Externí odkaz:
http://arxiv.org/abs/2405.06019
Autor:
Akhmedov, Evgeny, Trautner, Andreas
Finding out if neutrinos are Dirac or Majorana particles is known to be extremely difficult due to the smallness of neutrino mass and the fact that in the limit $m_\nu=0$ both Dirac and Majorana neutrinos become Weyl particles, i.e. are indistinguish
Externí odkaz:
http://arxiv.org/abs/2402.05172