From hard thermal loops to Langevin dynamics
نویسندگان
چکیده
منابع مشابه
Hard Thermal Loops from Transport Processes
Because the running coupling g(T ) of QCD decreases as a function of temperature T , the SU(3) color gauge theory becomes weakly coupled in the high temperature limit. Numerical simulations of the lattice gauge theory with dynamical quarks have shown that the equation of state ǫ(T ) makes a transition from the low-temperature phase, where the effective degrees of freedom are hadrons, to a high ...
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We present a unified description of the high temperature phase of QCD, the so-called quark-gluon plasma, in a regime where the effective gauge coupling g is sufficiently small to allow for weak coupling calculations. The main focuss is the construction of the effective theory for the collective excitations which develop at a typical scale gT , which is well separated from the typical energy of ...
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Chiral symmetry is used as the guiding principle to derive hard thermal loop effects in chiral perturbation theory. This is done by using a chiral invariant background field method for the non-linear sigma model and the WessZumino-Witten lagrangian, with and without external vector and axial vector sources. It is then shown that the n-point hard thermal loop is the leading thermal correction fo...
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Understanding the behaviour of quantum fields out of equilibrium is important both for cosmology and for heavy ion theory. A particularly interesting example of an event in the early universe in which out-of-equilibrium dynamics played a crucial role is the electroweak phase transition, since it may explain the observed baryon asymmetry in the Universe [1]. Although static equilibrium propertie...
متن کاملHard Thermal Loops near the Light-cone *
In hot gauge theories, perturbation theory at the scale of the Debye screening mass requires the resummation of the so-called hard thermal loops, which corresponds to using an effective action obtained by integrating out the modes with momentum of order of the temperature. As is well-known, quantities which are sensitive to the nonperturbative magnetic screening mass still remain incalculable i...
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ژورنال
عنوان ژورنال: Nuclear Physics B
سال: 1999
ISSN: 0550-3213
DOI: 10.1016/s0550-3213(99)00435-6