scholarly journals Critical behavior and phase diagrams of a spin-1 Blume–Capel model with random crystal field interactions: An effective field theory analysis

2012 ◽  
Vol 391 (9) ◽  
pp. 2819-2832 ◽  
Author(s):  
Yusuf Yüksel ◽  
Ümit Akıncı ◽  
Hamza Polat
Keyword(s):  
Field Theory ◽  
Phase Diagrams ◽  
Crystal Field ◽  
Effective Field Theory ◽  
Critical Behavior ◽  
Effective Field ◽  
Theory Analysis

Thermodynamic quantities and phase diagrams of spin-1 Blume–Capel bilayer Ising model

2015 ◽  
Vol 29 (20) ◽  
pp. 1550141 ◽  
Author(s):  
Ersin Kantar ◽  
Mehmet Ertaş
Keyword(s):  
Field Theory ◽  
Ising Model ◽  
Phase Diagrams ◽  
Effective Field Theory ◽  
Critical Behavior ◽  
Tricritical Point ◽  
Effective Field ◽  
Square Lattice ◽  
Thermodynamic Quantities ◽  
Hamiltonian Parameters

An effective field theory with correlations has been used to study the critical behavior of the spin-1 Blume–Capel bilayer Ising model on a square lattice. The effects of the Hamiltonian parameters on thermodynamic quantities and phase diagrams are investigated in detail. We found that the system exhibits the first and the second order transitions as well as tricritical point. Furthermore, we have observed that the change of tricritical point values depends on interaction parameters.

scholarly journals Effective field theory analysis of dark matter-standard model interactions with spin one mediators

2021 ◽  
Vol 2021 (2) ◽  
Author(s):  
Fabiola Fortuna ◽  
Pablo Roig ◽  
José Wudka
Keyword(s):  
Field Theory ◽  
Dark Matter ◽  
Standard Model ◽  
Effective Field Theory ◽  
Gamma Ray ◽  
Direct Detection ◽  
Effective Field ◽  
Indirect Detection ◽  
Theory Analysis ◽  
Invisible Decay

Abstract We analyze interactions between dark matter and standard model particles with spin one mediators in an effective field theory framework. In this paper, we are considering dark particles masses in the range from a few MeV to the mass of the Z boson. We use bounds from different experiments: Z invisible decay width, relic density, direct detection experiments, and indirect detection limits from the search of gamma-ray emissions and positron fluxes. We obtain solutions corresponding to operators with antisymmetric tensor mediators that fulfill all those requirements within our approach.

scholarly journals PHASE DIAGRAMS OF THE SPIN-1 BLUME–EMERY–GRIFFITHS MODEL IN A RANDOM TRANSVERSE FIELD

2004 ◽  
Vol 18 (31n32) ◽  
pp. 4129-4142 ◽  
Author(s):  
H. EZ-ZAHRAOUY ◽  
H. MAHBOUB ◽  
A. BENYOUSSEF ◽  
M. J. OUAZZANI
Keyword(s):  
Field Theory ◽  
Phase Diagrams ◽  
Effective Field Theory ◽  
Low Temperatures ◽  
Transverse Field ◽  
Effective Field ◽  
Long Range Order ◽  
Special Value ◽  
Tricritical Behavior ◽  
Beg Model

The effect of the random quantum transverse field Ω on the tricritical behavior of the spin-1 Blume–Emery–Griffiths (BEG) model is studied using an effective field theory. It is found that the tricritical behavior depends on both the biquadratic interaction K, single-ion anisotropy Δ and the concentration p of the disorder of Ω. Indeed, there exists a special value p1 of the probability p below which the tricritical behavior disappears. In addition, at sufficiently low temperatures, the system exhibits long-range order accompanied by the tricritical behavior below a special value p2 of the probability p.

scholarly journals Effective field theory analysis of Higgs naturalness

2015 ◽  
Vol 92 (1) ◽  
Author(s):  
Shaouly Bar-Shalom ◽  
Amarjit Soni ◽  
Jose Wudka
Keyword(s):  
Field Theory ◽  
Effective Field Theory ◽  
Effective Field ◽  
Theory Analysis

scholarly journals Stationary State Solutions of a Bond Diluted Kinetic Ising Model: An Effective-Field Theory Analysis

2012 ◽  
Vol 147 (6) ◽  
pp. 1068-1076 ◽  
Author(s):  
E. Vatansever ◽  
B. O. Aktas ◽  
Y. Yüksel ◽  
U. Akinci ◽  
H. Polat
Keyword(s):  
Field Theory ◽  
Ising Model ◽  
Stationary State ◽  
Effective Field Theory ◽  
Effective Field ◽  
Theory Analysis ◽  
Kinetic Ising Model
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