Results 1 to 10 of about 90,298 (167)
Interplay between improved interaction rates and modified cosmological histories for dark matter
Frontiers in Physics, 2023 A novel particle has been and still is an intriguing option to explain the strong evidence for dark matter in our universe. To quantitatively predict the dark matter energy density, two main ingredients are needed: interaction rates and the history of ...
Simone Biondini
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Feynman rules for forced wave turbulence
Journal of High Energy Physics, 2023 It has long been known that weakly nonlinear field theories can have a late-time stationary state that is not the thermal state, but a wave turbulent state with a far-from-equilibrium cascade of energy.
Vladimir Rosenhaus, Michael Smolkin
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Thermal Effects in Ising Cosmology
Universe, 2023 We consider a real scalar field in de Sitter background and compute its thermal propagators. We propose that in a dS/CFT context, nontrivial thermal effects as seen by an ‘out’ observer can be encoded in the anomalous dimensions of the d=3 Ising model ...
Nikos Irges +2 more
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Determining all thermodynamic transport coefficients for an interacting large N quantum field theory
Journal of High Energy Physics, 2023 Thermodynamic transport coefficients can be calculated directly from quantum field theory without requiring analytic continuation to real time. We determine all second-order thermodynamic transport coefficients for the uncharged N-component massless ...
Max Weiner, Paul Romatschke
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Perturbative nonequilibrium thermal field theory [PDF]
Physical Review D, 2013 We present a new perturbative formulation of non-equilibrium thermal field theory, based upon non-homogeneous free propagators and time-dependent vertices. Our approach to non-equilibrium dynamics yields time-dependent diagrammatic perturbation series that are free of pinch singularities, without the need to resort to quasi-particle approximation or ...
Millington, P, Pilaftsis, A
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Renormalized thermal entropy in field theory [PDF]
Physical Review D, 2009 Standard entropy calculations in quantum field theory, when applied to a subsystem of definite volume, exhibit area-dependent UV divergences that make a thermodynamic interpretation troublesome. In this paper we define a renormalized entropy which is related with the Newton-Wigner position operator. Accordingly, whenever we trace over a region of space,
CACCIATORI, SERGIO LUIGI +2 more
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INTRODUCTION TO THERMAL FIELD THEORY [PDF]
International Journal of Modern Physics A, 1993 This is a very basic introduction and short (and of course incomplete) overview of thermal field theory. In the first part, I introduce the thermal propagator at a very simple level and give the Feynman rules using the time-path contour method. In the second part, I give examples of these rules in scalar theory and discuss the origin of the thermal ...
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Thermal field theory and infinite statistics [PDF]
Nuclear Physics B, 1993 We construct a quantum thermal field theory for scalar particles in the case of infinite statistics. The extension is provided by working out the Fock space realization of a "quantum algebra", and by identifying the hamiltonian as the energy operator.
Altherr, T., Grandou, T.
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Holographic thermal correlators: a tale of Fuchsian ODEs and integration contours
Journal of High Energy Physics, 2023 We analyze real-time thermal correlation functions of conserved currents in holographic field theories using the grSK geometry, which provides a contour prescription for their evaluation.
R. Loganayagam +2 more
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THERMAL RENORMALONS IN SCALAR FIELD THEORY [PDF]
Modern Physics Letters A, 2000 In the framework of the scalar theory gϕ4, we explore the occurrence of thermal renormalons, i.e. temperature-dependent singularities in the Borel plane. The discussion of a particular renormalon type diagram at finite temperature, using Thermofield Dynamics, allows us to establish that these singularities actually get a temperature dependence.
Loewe, M., Valenzuela, C.
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