Sublattice magnetizations of ultrathin alloy [Co1−cGdc]n nanojunctions between Co leads using the combined effective field theory and mean field theory methods

2013 ◽  
Vol 113 (9) ◽  
pp. 094303 ◽  
Author(s):  
M. Abou Ghantous ◽  
A. Khater ◽  
V. Ashokan ◽  
D. Ghader
Keyword(s):  
Field Theory ◽  
Effective Field Theory ◽  
Mean Field Theory ◽  
Mean Field ◽  
Effective Field

scholarly journals NATURALNESS IN AN EFFECTIVE FIELD THEORY FOR NEUTRON STAR MATTER

2004 ◽  
Vol 13 (07) ◽  
pp. 1413-1418 ◽  
Author(s):  
MOISÉS RAZEIRA ◽  
CÉSAR A. Z. VASCONCELLOS
Keyword(s):  
Field Theory ◽  
Neutron Stars ◽  
Nuclear Matter ◽  
Effective Field Theory ◽  
Mean Field ◽  
Effective Field ◽  
Hadronic Matter ◽  
Model Parameters ◽  
Static Properties ◽  
Naive Dimensional Analysis

High density hadronic matter is studied in a generalized relativistic multi-baryon Lagrangian density mean field approach which contains nonlinear couplings of the σ, ω, ϱ fields. We compare the predictions of our model with estimates obtained within a phenomenological naive dimensional analysis based on the naturalness of the coefficients of the theory. Upon adjusting the model parameters to describe bulk static properties of ordinary nuclear matter, we show that our approach represents a natural modelling of nuclear matter under the extreme conditions of density as the ones found in the interior of neutron stars. Moreover, we show that naturalness play a major role in effective field theory and, in combination with experiment, could represent a relevant criterium to select a model among others in the description of global static properties of neutron stars.

scholarly journals Effective field theory and nuclear mean-field models

2000 ◽  
Vol 663-664 ◽  
pp. 513c-516c ◽  
Author(s):  
R.J. Furnstahl ◽  
Brian D. Serot
Keyword(s):  
Field Theory ◽  
Effective Field Theory ◽  
Mean Field ◽  
Effective Field ◽  
Mean Field Models

THE NEW MEAN FIELD RENORMALIZATION GROUP FROM EFFECTIVE FIELD THEORY

1995 ◽  
Vol 09 (24) ◽  
pp. 1617-1621 ◽  
Author(s):  
F. O. COELHO ◽  
J. A. PLASCAK
Keyword(s):  
Field Theory ◽  
Renormalization Group ◽  
Effective Field Theory ◽  
Order Parameter ◽  
Mean Field ◽  
Previous Treatment ◽  
Field Approximation ◽  
Effective Field ◽  
Mean Field Approximation ◽  
Field Renormalization

The new mean field renormalization group is used to study the Ising model through the calculation of the order parameter by means of the effective field theory based on Callen–Suzuki identity. By considering one- and two-spin clusters, better results are obtained when compared to the previous treatment using the usual mean field approximation.

scholarly journals Uncertainty quantification of effective nuclear interactions

2016 ◽  
Vol 25 (05) ◽  
pp. 1641009 ◽  
Author(s):  
R. Navarro Pérez ◽  
J. E. Amaro ◽  
E. Ruiz Arriola
Keyword(s):  
Field Theory ◽  
Uncertainty Quantification ◽  
Effective Field Theory ◽  
Mean Field ◽  
Effective Field ◽  
Effective Interactions ◽  
Systematic Uncertainties ◽  
Nuclear Interactions ◽  
Recent Developments

We give a brief review on the development of phenomenological NN interactions and the corresponding quantification of statistical uncertainties. We look into the uncertainty of effective interactions broadly used in mean field calculations through the Skyrme parameters and effective field theory counterterms by estimating both statistical and systematic uncertainties stemming from the NN interaction. We also comment on the role played by different fitting strategies on the light of recent developments.

scholarly journals Modified Mean-Field Theory of One-Dimensional Spin Models with Anisotropy and Long-Range Dipolar Interactions

2020 ◽  
Vol 65 (8) ◽  
pp. 691
Author(s):  
P. J. Camp ◽  
A. O. Ivanov
Keyword(s):  
Field Theory ◽  
Long Range ◽  
Dipole Moments ◽  
Mean Field Theory ◽  
Mean Field ◽  
Effective Field ◽  
Superparamagnetic Nanoparticles ◽  
Dipolar Interactions ◽  
Strong Anisotropy ◽  
Spin Models

The effects of interactions and anisotropy on the magnetic properties of linear chains of superparamagnetic nanoparticles are studied theoretically by mapping the problem onto spin models. With zero anisotropy, the magnetic dipole moments are free to rotate, and the system resembles a classical ferromagnetic Heisenberg model with long-range dipolar interactions. With strong anisotropy, they are constrained to align with the chain, and the system resembles the classical ferromagnetic Ising model with long-range interactions. Using a modified mean-field theory, expressions for the magnetization curve and initial magnetic susceptibility are derived from the response of a single particle subject to an effective field arising from the applied field and the interactions with the other particles. Various approximations for the effective field are tested against results from Monte Carlo simulations. It is shown that, for physically relevant interaction strengths, reliable theoretical predictions for both the zero-anisotropy and strong-anisotropy cases can be derived in a simple closed form.

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