Publications (3)1.13 Total impact
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ABSTRACT: We consider the Lorentz violated extension of the standard model. In this framework, there are terms that explicitly violate CPsymmetry. We examine the CPTeven $d_{\mu\nu}$term to find the electric dipole moment of charged leptons. We show that the form factors besides the momentum transfer, depend on a new Lorentzscalar, constructing by $d_{\mu\nu}$ and the four momenta of the lepton, as well. Such an energy dependence of the electric dipole form factor leads to an enhancement of the lepton electric dipole moment at high energy, even at the zero momentum transfer. We show that at $\frac{dp^2}{m^2_l}\sim 1$ the electric dipole moment of the charged lepton can be as large as $10^{14} e\,\,cm$.International Journal of Modern Physics A 08/2013; 28(24). · 1.13 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: The properties of magnetized plasmas are always investigated under the hypothesis that the relativistic inhomogeneities stemming from the fluid sources and from the geometry itself are sufficiently small to allow for a perturbative description prior to photon decoupling. The latter assumption is hereby relaxed and predecoupling plasmas are described within a suitable expansion where the inhomogeneities are treated to a given order in the spatial gradients. It is argued that the (general relativistic) gradient expansion shares the same features of the drift approximation, customarily employed in the description of cold plasmas, so that the two schemes are physically complementary in the largescale limit and for the lowfrequency branch of the spectrum of plasma modes. The twofluid description, as well as the magnetohydrodynamical reduction, are derived and studied in the presence of the spatial gradients of the geometry. Various solutions of the coupled system of evolution equations in the antiNewtonian regime and in the quasiisotropic approximation are presented. The relation of this analysis to the socalled separate Universe paradigm is outlined. The evolution of the magnetized curvature perturbations in the nonlinear regime is addressed for the magnetized adiabatic mode in the plasma frame.Physical review D: Particles and fields 02/2011; 83(8).  [Show abstract] [Hide abstract]
ABSTRACT: According to the standard cosmology, near the last scattering surface, the photons scattered via Compton scattering are just linearly polarized and then the primordial circular polarization of the CMB photons is zero. In this work we show that CMB polarization acquires a small degree of circular polarization when a background magnetic field is considered or the quantum electrodynamic sector of standard model is extended by Lorentznoninvariant operators as well as noncommutativity. The existence of circular polarization for the CMB radiation may be verified during future observation programs and it represents a possible new channel for investigating new physics effects. Comment: 28 pages, v3, Phys. Rev. D 81, 084035 (2010)Physical review D: Particles and fields 12/2009;
Publication Stats
19  Citations  
1.13  Total Impact Points  
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Institutions

2009

Isfahan University of Technology
 Department of Physics
Eşfahān, Ostane Esfahan, Iran
