scholarly journals THERMODYNAMICS OF SOFT WALL AdS/QCD AT FINITE CHEMICAL POTENTIAL

2012 ◽  
Vol 27 (28) ◽  
pp. 1250163 ◽  
Author(s):  
SHOBHIT SACHAN ◽  
SANJAY SIWACH
Keyword(s):  
Chemical Potential ◽  
High Temperature Phase ◽  
Temperature Phase ◽  
Wall Model ◽  
Soft Wall Model ◽  
Soft Wall ◽  
Dimensional Gravity ◽  
The Difference ◽  
Two Phases ◽  
Low Temperature Phase

We study the thermodynamics of soft wall model in AdS/QCD framework. The low temperature phase of QCD is described by thermal AdS and high temperature phase by AdS black hole solution of five-dimensional gravity with negative cosmological constant. The chemical potential is introduced via the solution of U(1) vector field in the bulk. The difference of action densities in two phases is studied and the results are compared with hard wall model. The quark number susceptibility is also calculated in both models.

scholarly journals RG flow of AC conductivity in soft wall model of QCD

2016 ◽  
Vol 31 (08) ◽  
pp. 1650030
Author(s):  
Neha Bhatnagar ◽  
Sanjay Siwach
Keyword(s):  
Black Hole ◽  
Renormalization Group ◽  
Numerical Solution ◽  
Ac Conductivity ◽  
Chemical Potential ◽  
Radial Coordinate ◽  
Wall Model ◽  
Soft Wall Model ◽  
Soft Wall ◽  
Holographic Qcd

We study the Renormalization Group (RG) flow of AC conductivity in soft wall model of holographic QCD. We consider the charged black hole metric and the explicit form of AC conductivity is obtained at the cutoff surface. We plot the numerical solution of conductivity flow as a function of radial coordinate. The equation of gauge field is also considered and the numerical solution is obtained for AC conductivity as a function of frequency. The results for AC conductivity are also obtained for different values of chemical potential and Gauss–Bonnet couplings.

scholarly journals Thermodynamics of soft wall model of AdS/QCD in Einstein-Maxwell-Gauss-Bonnet Gravity

2020 ◽  
Author(s):  
Shobhit Sachan ◽  
Sanjay Siwach
Keyword(s):  
Black Hole ◽  
Transition Temperature ◽  
Chemical Potential ◽  
Space Time ◽  
Hard Wall ◽  
Wall Model ◽  
Bonnet Gravity ◽  
First Order ◽  
Soft Wall Model ◽  
Soft Wall

We investigate the thermodynamics of confinement/deconfinement transition in soft wall model of QCD with Gauss-Bonnet corrections using AdS/CFT correspondence. In bulk AdS space-time the transition is geometric and is known as Hawking-Page transition. The Hawking-Page transition between two geometries, namely charged AdS black hole and thermally charged AdS have been studied with Gauss-Bonnet corrections up-to first order. The Gauss-Bonnet coupling modifies the transition temperature of the system, but qualitative features remain unchanged. We obtain the curves between chemical potential and transition temperature for different values of Gauss-Bonnet couplings. We find that there exist a point in μ-T plane where lines with different value of Gauss-Bonnet coupling cross each other. This point may be the onset of the transition from first order to cross over behavior. The results are compared with that of the hard wall model.

Investigation of the C-Cl Bonds in Trichloroacrylic Acid, Cl2C = CClCOOH, by Single Crystal Zeeman Split NQR

1990 ◽  
Vol 45 (3-4) ◽  
pp. 243-248
Author(s):  
Gary Wulfsberg ◽  
Norbert Weiden ◽  
Alarich Weiss
Keyword(s):  
Phase Transition ◽  
High Temperature ◽  
Single Crystal ◽  
Asymmetry Parameter ◽  
High Temperature Phase ◽  
Temperature Phase ◽  
Electric Field Gradients ◽  
Field Gradients ◽  
The Difference ◽  
Low Temperature Phase

AbstractThe 35Cl NQR spectrum of trichloroacrylic acid, Cl2C = CClCOOH, was studied by single crystal Zeeman NQR spectroscopy at 303 K (high temperature phase I) and at 275 K (low temperature phase II). At 303 K for the = CCl2 group chlorines it was found eQΦzz h-1(35Cl(2)) = 76.179 MHz, η (35Cl) = 0.1597; eQΦzz h -1 (35Cl(3))= 74.693 MHz, η(35Cl) = 0.1868 and for the = CClC - group chlorine eQΦzz h -1(35Cl(1)) = 75.145 MHz, η (35Cl) = 0.1568. The difference in the electric field gradients at the stereochemically inequivalent chlorines Cl(2) and Cl(3) is rather large. The asymmetry parameter η (35Cl(1)) shows an unusual temperature dependence which probably originates from the change of the hydrogen dynamics and position within the dimeric H-bonded unit (Cl2C = CClCOOH)2 during the phase transition

scholarly journals NUCLEON RESONANCES AND GPDS IN AdS/QCD

2014 ◽  
Vol 26 ◽  
pp. 1460066 ◽  
Author(s):  
ALFREDO VEGA ◽  
IVAN SCHMIDT ◽  
THOMAS GUTSCHE ◽  
VALERY E. LYUBOVITSKIJ
Keyword(s):  
Roper Resonance ◽  
Wall Model ◽  
Nucleon Resonances ◽  
Soft Wall Model ◽  
Nucleon Spectrum ◽  
Soft Wall

We discuss an holographic soft wall model to describe nucleon properties. We pay special attention to nucleon spectrum, GPDs in the skewness case for nucleons and electroproduction of the N (1440) Roper resonance in soft-wall AdS/QCD.

scholarly journals Extended Soft-wall Model for the QCD Phase Diagram

2017 ◽  
Vol 10 (3) ◽  
pp. 789
Author(s):  
R. Zöllner ◽  
F. Wunderlich ◽  
B. Kämpfer
Keyword(s):  
Phase Diagram ◽  
Wall Model ◽  
Qcd Phase Diagram ◽  
Soft Wall Model ◽  
Soft Wall

scholarly journals Neural Network for Prediction of Curie Temperature of Two-Dimensional Ising Model

2021 ◽  
Vol 21 (1) ◽  
pp. 51-60
Author(s):  
A.O. Korol ◽  
◽  
V.Yu. Kapitan ◽  
◽  
◽  
...  
Keyword(s):  
Neural Network ◽  
Ising Model ◽  
Curie Temperature ◽  
High Temperature Phase ◽  
Square Lattice ◽  
Temperature Phase ◽  
The Neural Network ◽  
Different Temperatures ◽  
Low Temperature Phase ◽  
Ising Spins

The authors describe a method for determining the critical point of a second-order phase transitions using a convolutional neural network based on the Ising model on a square lattice. Data for training were obtained using Metropolis algorithm for different temperatures. The neural network was trained on the data corresponding to the low-temperature phase, that is a ferromagnetic one and high-temperature phase, that is a paramagnetic one, respectively. After training, the neural network analyzed input data from the entire temperature range: from 0.1 to 5.0 (in dimensionless units) and determined (the Curie temperature T_c). The accuracy of the obtained results was estimated relative to the Onsager solution for a flat lattice of Ising spins.

Humidity sensitive irreversible phase transformation of an open-framework Zinc phosphate and its water-assisted high proton conduction properties

2021 ◽  
Author(s):  
Jing-Wei Yu ◽  
Hai-Jiao Yu ◽  
Qiu Ren ◽  
Jin Zhang ◽  
Yang Zou ◽  
...  
Keyword(s):  
Phase Transformation ◽  
High Temperature ◽  
Zinc Phosphate ◽  
High Temperature Phase ◽  
Temperature Phase ◽  
Open Framework ◽  
High Proton ◽  
Irreversible Phase Transformation ◽  
Low Temperature Phase ◽  
Conduction Properties

Open-framework zinc phosphate (NMe4)(ZnP2O8H3) undergoes irreversible phase transformation. Structural transformation with α (NMe4.Zn[HPO4][H2PO4] the low-temperature phase) and β (NMe4.ZnH3[PO4]2 the high-temperature phase) (Tc=149 °C) and conduction properties were investigated by...

On the Phase Transition of Bis(pyridinium)hexachlorometallates, (C5H5NH)2[MCl6], M = Sn, Te, Pb, Pt. An X-Ray and 35Cl NQR Study

1987 ◽  
Vol 42 (7) ◽  
pp. 739-748 ◽  
Author(s):  
Dirk Borchers ◽  
Alarich Weiss
Keyword(s):  
Crystal Structure ◽  
Phase Transition ◽  
Phase Ii ◽  
High Temperature Phase ◽  
Temperature Phase ◽  
X Ray ◽  
Lattice Constants ◽  
Pyridinium Ring ◽  
35Cl Nqr ◽  
Low Temperature Phase

A phase transition has been observed in bis(pyridinium) hexachlorometallates (C5H5NH)2[MIVCl6]. M = Sn. Te. Pb. Pt. The crystal structure of the low temperature phase II of the salt with M = Sn was determined, space group C 1ḷ- P 1̅, Z = 1 (a = 734.1pm, b = 799.0 pm, c = 799.7 pm,α= 83.229°. β = 65.377°, γ= 84.387°, T = 297 K). The four compounds are isotypic in phase II as well as in the high temperature phase I (C2H2-B2 /m, Z = 2) for which the crystal structure is known for M = Te . The lattice constants of all compounds (both phases) are given. The temperature dependence of the 35Cl NQR spectrum was investigated. The three line 35Cl NQR spectrum is in agreement with the crystal structure. The dynamics of the pyridinium ring shows up in a fade out of part of the 35Cl NQR spectrum . The influence o f H ↔ D exchange on 35Cl NQR is studied and an assignment of ν (35Cl) ↔ Cl(i) is proposed. The nature of the phase transition P1̅ (Z = 1) ↔ B2 /m (Z = 2) is discussed.

scholarly journals Synthesis of by the Flux Method

2012 ◽  
Vol 2012 ◽  
pp. 1-5 ◽  
Author(s):  
Yuki Maruyama ◽  
Chihiro Izawa ◽  
Tomoaki Watanabe
Keyword(s):  
High Temperature ◽  
Solid State ◽  
Low Temperature ◽  
Diffuse Reflectance ◽  
High Temperature Phase ◽  
Temperature Phase ◽  
Flux Method ◽  
Phase Crystal ◽  
Euhedral Crystal ◽  
Low Temperature Phase

has been successfully synthesized using Bi2O3–B2O3 eutectic flux. In particular, we succeeded in synthesizing a low-temperature-phase crystal (α-) at 1073 K as well as high-temperature-phase crystal (β-). The morphology of α- and β- particles prepared by the flux method is a euhedral crystal. In contrast, the morphology of particles prepared by solid state reaction differs: α- is aggregated and β- is necked. Ultraviolet-visible diffuse reflectance spectra indicate that the absorption edge is at a longer wavelength for β- than for α- with β- absorbing light of wavelengths up to nearly 400 nm.

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