scholarly journals SECOND-ORDER CORRECTIONS TO THE MAGNETIC MOMENT OF ELECTRON AT FINITE TEMPERATURE

2012 ◽  
Vol 27 (32) ◽  
pp. 1250188 ◽  
Author(s):  
SAMINA S. MASOOD ◽  
MAHNAZ Q. HASEEB
Keyword(s):  
Magnetic Moment ◽  
Finite Temperature ◽  
Heat Bath ◽  
Second Order ◽  
The Self ◽  
Electron Mass ◽  
Temperature Dependent ◽  
Primordial Nucleosynthesis ◽  
Physical Mass ◽  
The Magnetic Field

Magnetic moment of electron at finite temperature is directly related to the modified electron mass in the background heat bath. Magnetic moment of electron gets modified at finite temperature also, when it couples with the magnetic field, through its temperature-dependent physical mass. We show that the second-order corrections to the magnetic moment of electron is a complicated function of temperature. We calculate the self-mass induced thermal contributions to the magnetic moment of electron, up to the two-loop level, for temperatures valid around the era of primordial nucleosynthesis. A comparison of thermal behavior of the magnetic moment is also quantitatively studied in detail, around the temperatures below and above the nucleosynthesis temperature.

scholarly journals Generalized Gaussian Effective Potential: Second-Order Thermal Corrections

1997 ◽  
Vol 12 (15) ◽  
pp. 1077-1085
Author(s):  
Paolo Cea ◽  
Luigi Tedesco
Keyword(s):  
Scalar Field ◽  
Effective Potential ◽  
Finite Temperature ◽  
Spatial Dimension ◽  
Simple Relation ◽  
Second Order ◽  
The Self ◽  
Gaussian Effective Potential

We discuss the finite temperature generalized Gaussian effective potential. We put out a very simple relation between the thermal corrections to the generalized Gaussian effective potential and those of the effective potential. We evaluate explicitly the second-order thermal corrections in the case of the self-interacting scalar field in one spatial dimension.

Second-order electron mass dispersion relation at finite temperature

1991 ◽  
Vol 44 (10) ◽  
pp. 3322-3327 ◽  
Author(s):  
Mahnaz Qader ◽  
Samina S. Masood ◽  
K. Ahmed
Keyword(s):  
Dispersion Relation ◽  
Finite Temperature ◽  
Second Order ◽  
Electron Mass ◽  
Mass Dispersion

Second-order electron mass dispersion relation at finite temperature. II.

1992 ◽  
Vol 46 (12) ◽  
pp. 5633-5647 ◽  
Author(s):  
Mahnaz Qader ◽  
Samina S. Masood ◽  
K. Ahmed
Keyword(s):  
Dispersion Relation ◽  
Finite Temperature ◽  
Second Order ◽  
Electron Mass ◽  
Mass Dispersion

scholarly journals Primordial nucleosynthesis and finite temperature QED

2014 ◽  
Vol 23 (06) ◽  
pp. 1450059 ◽  
Author(s):  
Mahnaz Q. Haseeb ◽  
Obaidullah Jan ◽  
Omair Sarfaraz
Keyword(s):  
Finite Temperature ◽  
Big Bang ◽  
Light Nuclei ◽  
Neutron Decay ◽  
Electron Mass ◽  
Total Energy Density ◽  
Primordial Nucleosynthesis ◽  
Big Bang Model ◽  
Relative Change ◽  
The Universe

Abundances of light nuclei formed during primordial nucleosynthesis are predicted by Standard Big Bang Model (SBBM). Here, we evaluate the second-order quantum electro dynamics (QED) corrections to the change in these parameters during primordial nucleosynthesis due to modifications to mass and coupling using finite temperature effects. These are the contributions from the dynamically generated masses for electrons and photons in the finite temperature background. Relative variations in neutron decay rate, total energy density of the universe, relative change in neutrino temperature etc. with two-loops corrections to electron mass, at the timescale when QED corrections were relevant, have been estimated.

Ternary Antimonides RE4T7Sb6 (RE=Gd–Lu; T =Ru, Rh) with Cubic U4Re7Si6-type Structure

2013 ◽  
Vol 68 (9) ◽  
pp. 971-978 ◽  
Author(s):  
Inga Schellenberg ◽  
Ute Ch. Rodewald ◽  
Christian Schwickert ◽  
Matthias Eul ◽  
Rainer Pöttgen
Keyword(s):  
Magnetic Susceptibility ◽  
Single Crystal ◽  
Magnetic Moment ◽  
Induction Furnace ◽  
X Ray Diffraction ◽  
Temperature Dependent ◽  
X Ray ◽  
Antiferromagnetic Ordering ◽  
Arc Melting ◽  
Intermediate Valent

The ternary antimonides RE4T7Sb6 (RE=Gd-Lu; T =Ru, Rh) have been synthesized from the elements by arc-melting and subsequent annealing in an induction furnace. The samples have been characterized by powder X-ray diffraction. Four structures were refined on the basis of single-crystal X-ray diffractometer data: U4Re7Si6 type, space group Im3m with a=862.9(2) pm, wR2=0.0296, 163 F2 values for Er4Ru7Sb6; a=864.1(1) pm, wR2=0.1423, 153 F2 values for Yb4Ru7Sb6; a=872.0(2) pm, wR2=0.0427, 172 F2 values for Tb4Rh7Sb6; and a=868.0(2) pm, wR2=0.0529, 154 F2 values for Er4Rh7Sb6, with 10 variables per refinement. The structures have T1@Sb6 octahedra and slightly distorted RE@T26Sb6 cuboctahedra as building units. The distorted cuboctahedra are condensed via all trapezoidal faces, and this network leaves octahedral voids for the T1 atoms. The ruthenium-based series of compounds was studied by temperature-dependent magnetic susceptibility measurements. Lu4Ru7Sb6 is Pauli-paramagnetic. The antimonides RE4Ru7Sb6 with RE=Dy, Ho, Er, and Tm show Curie-Weiss paramagnetism. Antiferromagnetic ordering occurs at 10.0(5), 5.1(5) and 4.0(5) K for Dy4Ru7Sb6, Ho4Ru7Sb6 and Er4Ru7Sb6, respectively, while Tm4Ru7Sb6 remains paramagnetic. Yb4Ru7Sb6 is an intermediate-valent compound with a reduced magnetic moment of 3.71(1) μB per Yb as compared to 4.54 μB for a free Yb3+ ion

scholarly journals SECOND-ORDER CORRECTIONS TO QED COUPLING AT LOW TEMPERATURE

2008 ◽  
Vol 23 (29) ◽  
pp. 4709-4719 ◽  
Author(s):  
SAMINA S. MASOOD ◽  
MAHNAZ HASEEB
Keyword(s):  
Low Temperatures ◽  
Vacuum Polarization ◽  
Second Order ◽  
Electromagnetic Properties ◽  
Electron Mass ◽  
Polarization Tensor ◽  
Coupling Constant ◽  
Electric Permittivity ◽  
Thermal Medium ◽  
Vacuum Polarization Tensor

We calculate the second-order corrections to vacuum polarization tensor of photons at low temperatures, i.e. T ≪ 1010 K (T ≪ me). The thermal contributions to the QED coupling constant are evaluated at temperatures below the electron mass that is T < me. Renormalization of QED at these temperatures has explicitly been checked. The electromagnetic properties of such a thermal medium are modified. Parameters like electric permittivity and magnetic permeability of such a medium are no more constant and become functions of temperature.

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