ELFT HÍRADÓ

[Balog Janos <balog.janos AT wigner.mta.hu>]

RMI Elméleti Osztály Szemináriuma

Tisztelettel meghívjuk


                               D. B. Blaschke
                      (University of Wroclaw and JINR Dubna)

          "Short-distance electromagnetic structure of the physical 
vacuum"


                 címmel tartandó szemináriumára.


Helye: Wigner FK RMI III.ép. Tanácsterem
Ideje: 2012. április 19. csütörtök de. 10:00 óra


Kivonat:

Solutions of the kinetic equations are investigated which describe, on 
a
nonperturbative basis, the vacuum creation of quasiparticle
electron-positron pairs due to a strong laser field. The dependence
of the quasiparticle electron (positron) distribution function and the
particle number density is explored in a wide range of the laser
radiation parameters, i.e., wavelength lambda and electric field
strength E_0. Three domains are identified: the calm valley (the domain
of the vacuum polarization effects), where the residual density of the
e-e+ pairs is negligibly small, and two accumulation domains, in
which the production rate of e-e+ pairs is sharply increased and the 
e-e
+ pair density can reach asignificant values (the short wavelength
domain and the strong field one). In particular, the obtained
results point to a complicated short-distance electromagnetic structure
of the physical vacuum in the domain of short wavelengths. lambda <
lambda_c = hbar/m_c. For moderately strong fields E_0 < E_c = m^2/e the
accumulation regime can be realized where a plasma with a high density
of e-e+ quasiparticles can be achieved. In this domain of field
strengths and in the whole range of investigated wavelengths,
the observation of the dynamical Schwinger eect is facilitated.


Szívesen látunk minden érdeklődőt.
                                            Balog János