Zobrazeno 1 - 10
of 194
pro vyhledávání: '"Diakonov, D."'
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:
Diakonov, D., Morozov, A.
We extend the study of banana diagrams in coordinate representation to the case of curved space-times. If the space is harmonic, the Green functions continue to depend on a single variable -- the geodesic distance. But now this dependence can be some
Externí odkaz:
http://arxiv.org/abs/2408.15724
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:
Diakonov, D. V., Bazarov, K. V.
We consider the conformal scalar field theory with $\lambda \phi^4$ self-interaction in Rindler and Minkowskian coordinates at finite temperature planckian distribution for the exact modes. The solution of the one-loop Dyson-Schwinger equation is fou
Externí odkaz:
http://arxiv.org/abs/2301.07478
Autor:
Akhmedov, E. T., Diakonov, D. V.
We investigate the free energy and entropy of the Gaussian massive scalar field theory in the static de Sitter space-time for arbitrary temperature. For the inverse temperatures of the form $\beta=2 \pi 2^k, \ \ k\in \mathbf{Z}$, in curvature units,
Externí odkaz:
http://arxiv.org/abs/2112.14794
Publikováno v:
Phys. Rev. D 104, 085008 (2021)
We consider interacting massive scalar quantum field theory in the future Rindler wedge. This is a model example of quantum field theory in curved space--time. On this simple example we show how dynamics of correlation functions depends on the choice
Externí odkaz:
http://arxiv.org/abs/2106.01791
Publikováno v:
Phys. Rev. D 103, 025023 (2021)
We study quantum fields on spacetimes having a bifurcate Killing horizon by allowing the possibility that left- and right- (in-going and out-going) modes have different temperatures. We consider in particular the Rindler for both massless and massive
Externí odkaz:
http://arxiv.org/abs/2010.10877
Publikováno v:
Phys. Rev. D 102, 085003 (2020)
We construct explicit mode expansions of various tree-level propagators in the Rindler -- de Sitter universe, also known as the static (or compact) patch of the de Sitter spacetime. We construct in particular the Wightman functions for thermal states
Externí odkaz:
http://arxiv.org/abs/2005.13952
Publikováno v:
Phys. Rev. D 100, 105011 (2019)
We consider time-ordered (or Feynman) propagators between two different $\alpha-$states of a linear de Sitter Quantum Field in the global de Sitter manifold and in the Poincar\'e patch. We separately examine $\alpha-\beta$, In-In and In-Out propagato
Externí odkaz:
http://arxiv.org/abs/1905.09344
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