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Articles 1  4 of 4
FullText Articles in Physics
Microphysical Approach To Nonequilibrium Dynamics Of Quantum Fields, Marcelo Gleiser, Rudnei O. Ramos
Microphysical Approach To Nonequilibrium Dynamics Of Quantum Fields, Marcelo Gleiser, Rudnei O. Ramos
Open Dartmouth: Faculty Open Access Scholarship
We examine the nonequilibrium dynamics of a selfinteracting λφ4 scalar field theory. Using a real time formulation of finite temperature field theory we derive, up to two loops and O(λ2), the effective equation of motion describing the approach to equilibrium. We present a detailed analysis of the approxi mations used in order to obtain a Langevinlike equation of motion, in which the noise and dissipation terms associated with quantum fluctuations obey a fluctuationdissipation relation. We show that, in general, the noise is colored (timedependent) and multiplicative (couples nonlinearly to the field), even though it is still Gaussian distributed. The ...
Pseudostable Bubbles, Marcelo Gleiser
Pseudostable Bubbles, Marcelo Gleiser
Open Dartmouth: Faculty Open Access Scholarship
The evolution of spherically symmetric unstable scalar field configura tions (“bubbles”) is examined for both symmetric (SDWP) and asymmet ric (ADWP) doublewell potentials. Bubbles with initial static energiesE0 ∼< Ecrit, where Ecrit is some critical value, shrink in a time scale deter mined by their linear dimension, or “radius”. Bubbles with E0 ∼> Ecrit evolve into timedependent, localized configurations which are very longlived com pared to characteristic timescales in the models examined. The stability of these configurations is investigated and possible applications are briefly discussed.
Metastability In Two Dimensions And The Effective Potential, Mark Alford, Marcelo Gleiser
Metastability In Two Dimensions And The Effective Potential, Mark Alford, Marcelo Gleiser
Open Dartmouth: Faculty Open Access Scholarship
We study analytically and numerically the decay of a metastable phase in (2+1)dimensional classical scalar field theory coupled to a heat bath, which is equivalent to twodimensional Euclidean quantum field theory at zero temperature. By a numerical simulation we obtain the nucleation barrier as a function of the parameters of the potential, and compare it to the theoretical prediction from the bounce (critical bubble) calculation. We find the nucleation barrier to be accurately predicted by theory using the bounce configuration obtained from the treelevel (“classical”) effective action. Within the range of parameters probed, we found that using the ...
Distinguishing A Charged Higgs Signal From A Heavy Wr Signal, David I. Kaiser
Distinguishing A Charged Higgs Signal From A Heavy Wr Signal, David I. Kaiser
Open Dartmouth: Faculty Open Access Scholarship
It is shown that nonStandard Model bosons should obey an observable asymmetry in their decays to taus. This asymmetry enables a distinction to be made between charged Higgsboson signalsand heavy righthanded Wboson signals,by reconstructing the orientation of the z with respect to the beam axis.