6,142 research outputs found
One loop light-cone QCD, effective action for reggeized gluons and QCD RFT calculus
The effective action for reggeized gluons is based on the gluodynamic
Yang-Mills Lagrangian with external current for longitudinal gluons added, see
[1]. On the base of classical solutions, obtained in [2], the one-loop
corrections to this effective action in light-cone gauge are calculated. The
RFT calculus for reggeized gluons similarly to the RFT introduced in [3] is
proposed and discussed. The correctness of the results is verified by
calculation of the propagator of and reggeized gluons fields
and application of the obtained results is discussed as well.Comment: 24 page
On the application of the effective action approach to amplitudes with reggeon splitting
Application of the effective action approach to amplitudes with loop
integration is studied for collisions on two and three centers with possible
gluon emission. A rule is formulated for the integration around pole
singularities in the induced vertices which brings the results in agreement
with the QCD. It is demonstrated that the amplitudes can be restored from the
purely transverse picture by introducing the standard Feynman propagators for
intermediate gluons and quarks.Comment: 16 pages, 9 figures; submitted to Eur.Phys.Jour.
Diffractive scattering on the deuteron projectile in the NLO: triple interaction of reggeized gluons
High-mass diffractive production of protons on the deuteron target is studied
in the next-to-leading order (NLO) of the perturbative QCD in the BFKL
approach. The non-trivial part of the NLO contributions coming from the triple
interactions of the exchanged reggeons is considered. Analytic formulas are
presented and shown to be infrared free and so ready for practical calculation.Comment: 28 pages, 2 figures; to be published in Eur.Phys.Jour.
Inverse Compton scattering in mildly relativistic plasma
We investigated the effect of inverse Compton scattering in mildly
relativistic static and moving plasmas with low optical depth using Monte Carlo
simulations, and calculated the Sunyaev-Zel'dovich effect in the cosmic
background radiation. Our semi-analytic method is based on a separation of
photon diffusion in frequency and real space. We use Monte Carlo simulation to
derive the intensity and frequency of the scattered photons for a monochromatic
incoming radiation. The outgoing spectrum is determined by integrating over the
spectrum of the incoming radiation using the intensity to determine the correct
weight. This method makes it possible to study the emerging radiation as a
function of frequency and direction. As a first application we have studied the
effects of finite optical depth and gas infall on the Sunyaev-Zel'dovich effect
(not possible with the extended Kompaneets equation) and discuss the parameter
range in which the Boltzmann equation and its expansions can be used. For high
temperature clusters ( keV) relativistic corrections based
on a fifth order expansion of the extended Kompaneets equation seriously
underestimate the Sunyaev-Zel'dovich effect at high frequencies. The
contribution from plasma infall is less important for reasonable velocities. We
give a convenient analytical expression for the dependence of the cross-over
frequency on temperature, optical depth, and gas infall speed. Optical depth
effects are often more important than relativistic corrections, and should be
taken into account for high-precision work, but are smaller than the typical
kinematic effect from cluster radial velocities.Comment: LateX, 30 pages and 11 figures. Accepted for publication in the
Astrophysical Journa
Unifying approaches: BK equation from the Lipatov's effective action
We consider a direct derivation of the Balitsky-Kovchegov
equation~\cite{Bal,Kovch} from the Lipatov's effective action~\cite{LipatovEff}
formulated in terms of interacting ordered exponentials~\cite{OurZub}. We
discuss the way the sub-leading eikonal corrections to the Balitsky-Kovchegov
equation arise from the transverse field contribution and sub-leading eikonal
corrections to the quark propagator. We outline other possible applications of
the proposed calculation scheme.Comment: 22 page
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