Zobrazeno 1 - 10
of 458
pro vyhledávání: '"Siqueira, J. A."'
We consider impulsive semiflows and establish sufficient conditions to the existence of invariant measures. Namely, the impulsive set and its image are both submanifolds of codimension one that are transversal to the flow direction. Moreover, we show
Externí odkaz:
http://arxiv.org/abs/2206.13001
Publikováno v:
In Journal of Mathematical Analysis and Applications 15 December 2024 540(2)
Objective: Bland and Altman plot method is a widely cited and applied graphical approach for assessing the equivalence of quantitative measurement techniques, usually aiming to replace a traditional technique with a new, less invasive, or less expens
Externí odkaz:
http://arxiv.org/abs/2108.12937
We obtain the effective Lagrangian of static gravitational fields interacting with a QED plasma at high temperature. Using the equivalence between the static hard thermal loops and those with zero external energy-momentum, we compute the effective La
Externí odkaz:
http://arxiv.org/abs/1311.2519
We discuss the high temperature behavior of retarded thermal loops in static external fields. We employ an analytic continuation of the imaginary time formalism and use a spectral representation of the thermal amplitudes. We show that, to all orders,
Externí odkaz:
http://arxiv.org/abs/1310.3246
We study, in a d-dimensional space-time, the nonanalyticity of the thermal free energy in the scalar phi^4 theory as well as in QED. We find that the infrared divergent contributions induce, when d is even, a nonanalyticity in the coupling alpha of t
Externí odkaz:
http://arxiv.org/abs/1211.3091
Autor:
Brandt, F. T., Siqueira, J. B.
We prove that the hard thermal loop contribution to static thermal amplitudes can be obtained by setting all the external four-momenta to zero before performing the Matsubara sums and loop integrals. At the one-loop order we do an iterative procedure
Externí odkaz:
http://arxiv.org/abs/1208.6585
Autor:
Brandt, F T, Siqueira, J B
We compute the effective Lagrangian of static gravitational fields interacting with thermal fields. Our approach employs the usual imaginary time formalism as well as the equivalence between the static and space-time independent external gravitationa
Externí odkaz:
http://arxiv.org/abs/1203.1670
Publikováno v:
Phys.Rev.D80:025024,2009
We derive a closed form expression for the sum of all the infrared divergent contributions to the free-energy of a gas of gravitons. An important ingredient of our calculation is the use of a gauge fixing procedure such that the graviton propagator b
Externí odkaz:
http://arxiv.org/abs/0904.4715
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