Thermo field dynamics for quantum fields with continuous mass spectrum

Henning, Peter A.

doi:10.1016/0370-1573(94)00083-f

Cited by 188 publications

(225 citation statements)

References 89 publications

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“…Analogously to the case of right-handed stops, the dispersion relations of charginos and neutralinos are changed by high temperature corrections [35]. Even though fermionic dispersion relations are highly nontrivial, relatively simple expressions for the fermionic spectral functions may be given in the limit in which the damping rate is smaller than the typical self-energy of the fermionic excitation (this limit is certainly satisfied in our case) [36]. For instance, the spectral function of Higgsinos H (and analogously for gauginos W , B) may be written as…”

Section: 1mentioning

confidence: 80%

Electroweak baryogenesis and low energy supersymmetry

et al. 1997

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Electroweak baryogenesis is an interesting theoretical scenario, which demands physics beyond the Standard Model at energy scales of the order of the weak boson masses. It has been recently emphasized that, in the presence of light stops, the electroweak phase transition can be strongly first order, opening the window for electroweak baryogenesis in the MSSM. For the realization of this scenario, the Higgs boson must be light, at the reach of the LEP2 collider. In this article, we compute the baryon asymmetry assuming the presence of non-trivial CP violating phases in the parameters associated with the left-right stop mixing term and the Higgsino mass µ. We conclude that a phase | sin φ µ | > 0.01 and Higgsino and gaugino mass parameters |µ| ≃ M 2 , and of the order of the electroweak scale, are necessary in order to generate the observed baryon asymmetry.February 1997 *

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Section: 1mentioning

confidence: 80%

Electroweak baryogenesis and low energy supersymmetry

et al. 1997

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“…However, many of these recipes are not correct as they violate some basic principle like detailed balance [32], and the description of resonances in dense matter has to be improved. The present study also gives some hints on how to generalize the transport picture towards the inclusion of off-shell propagations in dense matter [27,30,31].…”

Section: Introductionmentioning

confidence: 77%

“…First investigations of the quantum effects on the Boltzmann collision term were given by Danielewicz [25], the principle conceptual problems on the level of quantum field theory were investigated by Landsmann [21], while applications which seriously include the finite width of the particles in transport descriptions were carried out only in recent times, e.g. [12,[25][26][27][28][29][30][31][32][33][34][35]. For resonances, e.g.…”

Section: Introductionmentioning

confidence: 99%

Classical and Quantum Many-Body Description of Bremsstrahlung in Dense Matter

Knoll¹,

Voskresensky²

1996

Annals of Physics

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Some considerations about the importance of coherence effects for bremsstrahlung processes in non-equilibrium dense matter (Landau -Pomeranchuk -Migdal -effect) are presented. They are of particular relevance for the application to photonand di-lepton production from high energy nuclear collisions, to gluon radiation in QCD transport, or parton kinetics and to neutrino and axion radiation from supernova explosion and from hot neutron stars. The soft behavior of the bremsstrahlung from a source described by classical transport models is discussed and pocket correction formulas for the in-matter radiation cross sections are suggested in terms of standard transport coefficients. The radiation rates are also discussed within a non-equilibrium quantum field theory (Schwinger -Kadanoff -Baym -Keldysh) formulation. A classification of diagrams and corresponding resummation in physically meaningful terms is proposed, which considers the finite damping width of all source particles in matter. This way each diagram in this expansion is already free from the infra-red divergences. Both, the correct quasi-particle and quasi-classical limits are recovered from this subset of graphs. Explicit results are given for dense matter in thermal equilibrium. The diagrammatic description may suggest a formulation of a transport theory that includes the propagation of off-shell particles in non-equilibrium dense matter.

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“…The many-body problem at finite temperatures has been considered by several authors within different approaches, such as the finite temperature Green's function method (Fetter and Walecka, 1971), the thermo field method (Henning, 1995), or the Bloch-De Domicis (BD) diagrammatic expansion (Bloch, 1958;Bloch and De Domicis, 1958). The latter, was developed soon after the Brueckner theory, represents the "natural" extension to finite temperature of the BBG expansion, to which it leads in the zero temperature limit.…”

Section: Pimentioning

confidence: 99%

The Properties of Nuclear Matter

Hassaneen¹

2013

Physics International

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The microscopic and bulk properties of nuclear matter at zero and finite temperatures are studied in the frame of the Brueckner theory. The results for the symmetry energy are also obtained using different potentials. The calculations are based on realistic nucleon-nucleon interactions which reproduce the nucleon-nucleon phase shifts. These microscopic approaches are supplemented by a density-dependent contact interaction to achieve the empirical saturation property of symmetric nuclear matter. Special attention is paid to behavior of the effective mass in asymmetric nuclear matter. The nuclear symmetry potential at fixed nuclear density is also calculated and its value decreases with increasing the nucleon energy. The hot properties of nuclear matter are also calculated using T 2 -approximation at low temperatures. Good agreement is obtained in comparison with previous works around the saturation point.

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Thermo field dynamics for quantum fields with continuous mass spectrum

Cited by 188 publications

References 89 publications

Electroweak baryogenesis and low energy supersymmetry

Electroweak baryogenesis and low energy supersymmetry

Classical and Quantum Many-Body Description of Bremsstrahlung in Dense Matter

The Properties of Nuclear Matter

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