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Self-consistent description of e+e-gamma − plasma created from the vacuum in a strong electric laser field
http://lt-jds.jinr.ru/record/54269
In the present work a closed system of kinetic equations is obtained for the description of the vacuum creation of an electron-positron plasma and secondary photons due to a strong laser field. An estimate for the photon energy distribution is obtained. In the Markovian approximation the photon distribution has a 1/k spectrum (flicker noise).D. B. BlaschkeWed, 25 May 2011 09:51:16 GMThttp://lt-jds.jinr.ru/record/54269urn:ISSN:1063-77962010Self-Consistent Description of $e^+e^-\gamma$ Plasma Created from the Vacuum in a Strong Electric Laser Field
http://lt-jds.jinr.ru/record/50200
In the present work a closed system of kinetic equations is obtained for the description of the vacuum creation of an electron - positron plasma and secondary photons due to a strong laser field. An estimate for the photon energy distribution is obtained. In the Markovian approximation the photon distribution has a 1/k spectrum (flicker noise).Blaschke, D.B.Tue, 11 Jan 2011 12:04:51 GMThttp://lt-jds.jinr.ru/record/50200Workshop on Quark Matter in Astro- and Particle Physics
http://lt-jds.jinr.ru/record/35228
Burau, Gerhard RWed, 15 Dec 2010 11:58:24 GMThttp://lt-jds.jinr.ru/record/35228sine nomine2001A proposal for testing subcritical vacuum pair production with high power lasers
http://lt-jds.jinr.ru/record/30691
We present a proposal for testing the prediction of non-equilibrium quantum field theory below the Schwinger limit. The proposed experiments should be able to detect a measurable number of gamma rays resulting from the annihilation of pairs in the focal spot of two opposing high intensity laser beams. We discuss the dependence of the expected number of gamma rays with the laser parameters and compare with the estimated background level of gamma hits for realistic laser conditions.Gregori, G.Fri, 29 Oct 2010 11:13:46 GMThttp://lt-jds.jinr.ru/record/30691Kinetics of Photon Radiation off an e-e+ Plasma created from the Vacuum in a Strong Laser Field
http://lt-jds.jinr.ru/record/30656
We consider the one-photon annihilation mechanism in a electron - positron quasiparticle plasma (EPP) created from the vacuum in a strong subcritical laser field due to the dynamical Schwinger mechanism. On the basis of a kinetic theory approach we show that the secondary photons have a radiation spectrum proportional to 1/k (flicker noise). This effect is very small for EPP excitations in the optical spectrum but can reach quite observable values in the gamma - ray region.Blaschke, D.B.Fri, 29 Oct 2010 11:13:32 GMThttp://lt-jds.jinr.ru/record/30656Dynamical Schwinger effect and high-intensity lasers. realising nonperturbative QED
http://lt-jds.jinr.ru/record/29379
We consider the possibility of experimental verification of vacuum e^+e^- pair creation at the focus of two counter-propagating optical laser beams with intensities 10^{20}-10^{22} W/cm^2, achievable with present-day petawatt lasers, and approaching the Schwinger limit: 10^{29} W/cm^2 to be reached at ELI. Our approach is based on the collisionless kinetic equation for the evolution of the e^+ and e^- distribution functions governed by a non-Markovian source term for pair production. As possible experimental signals of vacuum pair production we consider e^+e^- annihilation into gamma-pairs and the refraction of a high-frequency probe laser beam by the produced e^+e^- plasma. We discuss the dependence of the dynamical pair production process on laser wavelength, with special emphasis on applications in the X-ray domain (X-FEL), as well as the prospects for \mu^+\mu^- and \pi^+\pi^- pair creation at high-intensity lasers. We investigate perspectives for using high-intensity lasers as ``boosters'' of ion beams in the few-GeV per nucleon range, which is relevant, e.g., to the exploration of the QCD phase transition in laboratory experiments.Blaschke, D.B.Fri, 29 Oct 2010 08:39:47 GMThttp://lt-jds.jinr.ru/record/29379Pair production and optical lasers
http://lt-jds.jinr.ru/record/27280
Electron-positron pair creation in a standing wave is explored using a parameter-free quantum kinetic equation. Field strengths and frequencies corresponding to modern optical lasers induce a material polarisation of the QED vacuum, which may be characterised as a plasma of e^+ e^- quasiparticle pairs with a density of ~10^{20}cm^{-3}. The plasma vanishes almost completely when the laser field is zero, leaving a very small residual pair density, n_r, which is the true manifestation of vacuum decay. The average pair density per period is proportional to the laser intensity but independent of the frequency, \nu. The density of residual pairs also grows with laser intensity but n_r \propto \nu^2. With optical lasers at the forefront of the current generation, these dynamical QED vacuum effects may generate 5-10 observable two-photon annihilation events per laser pulse.Blaschke, D.B.Thu, 28 Oct 2010 18:38:35 GMThttp://lt-jds.jinr.ru/record/27280Plasma production and thermalization in a strong field
http://lt-jds.jinr.ru/record/24973
Aspects of the formation and equilibration of a quark-gluon plasma are explored using a quantum kinetic equation, which involves a non-Markovian, Abelian source term for quark and antiquark production and, for the collision term, a relaxation time approximation that defines a time-dependent quasi-equilibrium temperature and collective velocity. The strong Abelian field is determined via the simultaneous solution of Maxwell's equation. A particular feature of this approach is the appearance of plasma oscillations in all thermodynamic observables. Their presence can lead to a sharp increase in the time-integrated dilepton yield.Vinnik, D.V.Thu, 28 Oct 2010 09:45:53 GMThttp://lt-jds.jinr.ru/record/24973A Kinetic approach to eta-prime production from a CP odd phase
http://lt-jds.jinr.ru/record/24696
The production of (eta,eta')- mesons during the decay of a CP-odd phase is studied within an evolution operator approach. We derive a quantum kinetic equation starting from the Witten-DiVecchia-Veneziano Lagrangian for pseudoscalar mesons containing a U_A(1) symmetry breaking term. The non-linear vacuum mean field for the flavour singlet pseudoscalar meson is treated as a classical, self-interacting background field with fluctuations assumed to be small. The numerical solution provides the time evolution of momentum distribution function of produced eta'- mesons after a quench at the deconfinement phase transition. We show that the time evolution of the momentum distribution of the produced mesons depend strongly on the shape of the effective potential at the end of the quench, exhibiting either parametric or tachyonic resonances. Quantum statistical effects are essential and lead to a pronounced Bose enhancement of the low momentum states.Blaschke, D.B.Thu, 28 Oct 2010 09:45:06 GMThttp://lt-jds.jinr.ru/record/24696Describing a(1) and b(1) decays
http://lt-jds.jinr.ru/record/23493
Two-body pion-radiating and weak decays of light axial-vector mesons and the rho are studied as a phenomenological application of the QCD Dyson-Schwinger equations. Models based on the rainbow-ladder truncation are capable of providing a good description and, in particular, yield the correct sign and magnitude of the a1 -> rho pi and b1 -> omega pi D/S ratios, with no additional mechanism necessary.Bloch, Jacques C.R.Thu, 28 Oct 2010 07:48:22 GMThttp://lt-jds.jinr.ru/record/23493K ---> pi pi and a light scalar meson
http://lt-jds.jinr.ru/record/23324
We explore the Delta-I= 1/2 rule and epsilon'/epsilon in K -> pi pi transitions using a Dyson-Schwinger equation model. Exploiting the feature that QCD penguin operators direct K^0_S transitions through 0^{++} intermediate states, we find an explanation of the enhancement of I=0 K -> pi pi transitions in the contribution of a light sigma-meson. This mechanism also affects epsilon'/epsilon.Bloch, Jacques C.R.Thu, 28 Oct 2010 07:47:58 GMThttp://lt-jds.jinr.ru/record/23324A Quantum kinetic equation for particle production in the Schwinger mechanism
http://lt-jds.jinr.ru/record/22681
A quantum kinetic equation is derived for the description of pair production in a time-dependent homogeneous electric field $E(t)$. As a source term, the Schwinger mechanism for particle creation is incorporated. Possible particle production due to collisions and collisional damping are neglected. The main result is a kinetic equation of non-Markovian character. In the low density approximation, the source term is reduced to the leading part of the well known Schwinger formula for the probability of pair creation. We discuss the momentum and time dependence of the derived source term and compare with other approaches.Schmidt, S.M.Thu, 28 Oct 2010 07:46:36 GMThttp://lt-jds.jinr.ru/record/22681NonMarkovian effects in strong field pair creation
http://lt-jds.jinr.ru/record/22605
We analyze a quantum kinetic equation describing both boson and fermion pair production and explore analytically and numerically the solution of the non-Markovian kinetic equation. In the Markovian limit of the kinetic equation we find an analytical solution for the single particle distribution function of bosons and fermions. The numerical investigation for a homogeneous, constant electric field shows an enhancement (bosons) or a suppression (fermions) of the pair creation rate according to the symmetry character of the produced particles. For strong fields non-Markovian effects are important while they disappear for weak fields. Hence it is sufficient to apply the low density limit for weak fields but necessary to take into account memory effects for strong fields.Schmidt, S.M.Thu, 28 Oct 2010 07:46:15 GMThttp://lt-jds.jinr.ru/record/22605Two photons annihilation of pions and the Compton effect off pions in hot and dense medium
http://lt-jds.jinr.ru/record/22078
Volkov, M.K.Wed, 27 Oct 2010 15:05:56 GMThttp://lt-jds.jinr.ru/record/22078Excess low-energy photon pairs from pion annihilation at the chiral phase transition
http://lt-jds.jinr.ru/record/22042
The photon pair production by pion annihilation in a hot and dense medium at the chiral phase transition is investigated within a chiral quark model. As a direct consequence of this transition the $\sigma$ meson appears as a bound state in the domain of temperatures and chemical potentials where the condition $M_\sigma(T,\mu) \approx 2 M_\pi(T,\mu)$ is fulfilled. This effect results in a strong enhancement of the cross section for the pion annihilation process $2 \pi \to 2 \gamma$ compared with the vacuum case. The calculation of the photon pair production rate as function of the invariant mass shows a strong enhancement and narrowing of the $\sigma$ meson resonance at threshold due to chiral symmetry restoration.Volkov, M.K.Wed, 27 Oct 2010 15:05:47 GMThttp://lt-jds.jinr.ru/record/22042Relativistic quantum kinetic equation of the Vlasov type for systems with internal degrees of freedom
http://lt-jds.jinr.ru/record/21884
We present an approach to derive a relativistic kinetic equation of the Vlasov type. Our approach is especially reliable for the description of quantum field systems with many internal degrees of freedom. The method is based on the Heisenberg picture and leads to a kinetic equation which fulfills the conservation laws. We apply the approach to the standard Walecka Lagrangian and an effective chiral Lagrangian.Smolyansky, S.A.Wed, 27 Oct 2010 15:05:35 GMThttp://lt-jds.jinr.ru/record/21884Dynamical derivation of a quantum kinetic equation for particle production in the Schwinger mechanism
http://lt-jds.jinr.ru/record/21745
A quantum kinetic equation has been derived for the description of pair production in a time-dependent homogeneous electric field $E(t)$. As a source term, the Schwinger mechanism for particle creation is incorporated. Possible particle production due to collisions and collisional damping are neglected. The main result is a closed kinetic equation of the non-Markovian type. In the low density approximation, the source term is reduced to the leading part of the well known Schwinger formula for the probability of pair creation. We compare the formula obtained with other approaches and discuss the differences.Smolyansky, S.A.Wed, 27 Oct 2010 15:05:19 GMThttp://lt-jds.jinr.ru/record/21745Instantaneous chiral quark model for relativistic mesons in a hot and dense medium
http://lt-jds.jinr.ru/record/19484
Blaschke, D.Wed, 27 Oct 2010 11:27:26 GMThttp://lt-jds.jinr.ru/record/19484Scalar - pseudoscalar meson masses in nonlocal effective QCD at finite temperature
http://lt-jds.jinr.ru/record/19387
Schmidt, S.M.Wed, 27 Oct 2010 11:27:21 GMThttp://lt-jds.jinr.ru/record/19387On the chiral transition temperature in bilocal effective QCD
http://lt-jds.jinr.ru/record/18664
Blaschke, D.Wed, 27 Oct 2010 11:26:08 GMThttp://lt-jds.jinr.ru/record/18664Pair production and optical lasers
http://lt-jds.jinr.ru/record/7094
Electron-positron pair creation in a standing wave is explored using a parameter-free quantum kinetic equation. Field strengths and frequencies corresponding to modern optical lasers induce a material polarisation of the QED vacuum, which may be characterised as a plasma of e^+ e^- quasiparticle pairs with a density of ~10^{20}cm^{-3}. The plasma vanishes almost completely when the laser field is zero, leaving a very small residual pair density, n_r, which is the true manifestation of vacuum decay. The average pair density per period is proportional to the laser intensity but independent of the frequency, \nu. The density of residual pairs also grows with laser intensity but n_r \propto \nu^2. With optical lasers at the forefront of the current generation, these dynamical QED vacuum effects may generate 5-10 observable two-photon annihilation events per laser pulse.
Blaschke, D BFri, 01 Oct 2010 19:00:26 GMThttp://lt-jds.jinr.ru/record/70942006