Nonequilibrium dynamics of scalar fields in a thermal bath

Anisimov, A.; Buchmüller, W.; Drewes, Marco; Mendizabal, S.

doi:10.1016/j.aop.2009.01.001

Cited by 87 publications

(167 citation statements)

References 27 publications

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“…It follows that the spectral function is also time-translation invariant: [18]. Indeed, using the time-translation invariance of Σ ρ p , one easily checks that the equation of motion for ρ p (t, t ′ ), see e.g.…”

Section: A Exact Solutionmentioning

confidence: 93%

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Langevin description of nonequilibrium quantum fields

Gautier

Serreau

2012

Phys. Rev. D

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We consider the non-equilibrium dynamics of a real quantum scalar field. We show the formal equivalence of the exact evolution equations for the statistical and spectral two-point functions with a fictitious Langevin process and examine the conditions under which a local Markovian dynamics is a valid approximation. In quantum field theory, the memory kernel and the noise correlator typically exhibit long time power laws and are thus highly non-local, thereby questioning the possibility of a local description. We show that despite this fact, there is a finite time range during which a local description is accurate. This requires the theory to be (effectively) weakly coupled. We illustrate the use of such a local description for studies of decoherence and entropy production in quantum field theory.

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Section: A Exact Solutionmentioning

confidence: 93%

“…The most popular such effective approaches are kinetic descriptions [8,9,[12][13][14][15][16][17][18][19][20], or effective Langevin descriptions [21][22][23][24][25][26][27][28]. A key issue in this context concerns the domain of validity of such approaches.…”

Section: Introductionmentioning

confidence: 99%

Langevin description of nonequilibrium quantum fields

Gautier

Serreau

2012

Phys. Rev. D

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“…Photons in the thermal plasma acquire a thermal mass of order eT , and once it exceeds half the ALP effective mass, the perturbative decay is kinematically forbidden. Then, evaporation process of the ALP condensate with the ambient plasma such as φ + γ → e − + e + becomes significant [52][53][54][55][56]. The thermal dissipation of the QCD axion was studied in ref.…”

Section: Coupling To Photons and Dissipation Ratesmentioning

confidence: 99%

The ALP miracle revisited

Daido¹,

Takahashi²,

Yin³

2018

J. High Energ. Phys.

102

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We revisit the ALP miracle scenario where the inflaton and dark matter are unified by a single axion-like particle (ALP). We first extend our previous analysis on the inflaton dynamics to identify the whole viable parameter space consistent with the CMB observation. Then, we evaluate the relic density of the ALP dark matter by incorporating uncertainties of the model-dependent couplings to the weak gauge bosons as well as the dissipation effect. The preferred ranges of the ALP mass and coupling to photons are found to be 0.01 m φ 1 eV and g φγγ = O(10 −11 ) GeV −1 , which slightly depend on these uncertainties. Interestingly, the preferred regions are within reach of future solar axion helioscope experiments, IAXO and TASTE, and laser-based stimulated photon-photon collider experiments. We also discuss possible extensions of the ALP miracle scenario by introducing interactions of the ALP with fermions.

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“…In particular, it is currently not possible to quote a theoretical error on the predicted bayon asymmetry. Within quantum field theory, leptogenesis can be treated on the basis of the Schwinger-Keldysh formalism [33,34], and during the past years significant progress has been made towards a 'theory of leptogenesis' [36,37,38,39,40]. Very important in this context is also the calculation of quantum corrections to decay widths and scattering cross sections at high temperature [41,42,43].…”

Section: Nonequilibrium Theorymentioning

confidence: 99%

Leptogenesis: Theory & Neutrino Masses

Buchmüller¹

2013

Nuclear Physics B - Proceedings Supplements

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After a brief discussion of baryon and lepton number nonconservation, we review the status of thermal leptogenesis with GUT scale neutrino masses, as well as low scale alternatives with keV neutrinos as dark matter and heavy neutrino masses within the reach of the LHC. Recent progress towards a full quantum mechnical description of leptogenesis is described with resonant leptogenesis as an application. Finally, cosmological B-L breaking after inflation is considered as origin of the hot early universe, generating entropy, baryon asymmetry and dark matter. Here N CS , the Chern-Simons number, is an integer characterizing the sphaleron gauge field configuration. At high temperatures, between the critical temperature T EW of the electroweak phase transition and a maximal temperature T S PH ,these processes are believed to be in thermal equilibrium [3]. Although uncontroversial among theorists, it has to be stressed that this important phenomenon has so far not been experimentally tested! It is therefore very 1 Talk given at the XXV International Conference on Neutrino Physics and Astrophysics, June 3-9, 2012, Kyoto, Japan Figure 1: One of the 12-fermion processes which are in thermal equilibrium in the high-temperature phase of the Standard Model.interesting that the corresponding phenomenon of chirality changing processes in strong interactions might be observable in heavy ion collisions at the LHC [4,5].Sphaleron processes relate baryon and lepton number and therefore strongly affect the generation of the cosmological baryon asymmetry. Analyzing the chemical potentials of quarks and leptons in thermal equilibrium, one obtains an important relation between the asymmearXiv:1210.7758v1 [hep-ph]

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Nonequilibrium dynamics of scalar fields in a thermal bath

Cited by 87 publications

References 27 publications

Langevin description of nonequilibrium quantum fields

Langevin description of nonequilibrium quantum fields

The ALP miracle revisited

Leptogenesis: Theory & Neutrino Masses

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