Effect of Alkyl Chain Length of Alcohols on Cholesteric Uniaxial to Cholesteric Biaxial Phase Transitions in a Potassium Laurate/Alcohol/Potassium Sulfate/Water/Brucine Lyotropic Mixture: Evidence of a First-Order Phase Transition

2013 ◽  
Vol 117 (3) ◽  
pp. 942-948 ◽  
Author(s):  
Dennys Reis ◽  
Erol Akpinar ◽  
Antônio Martins Figueiredo Neto
Keyword(s):  
Phase Transition ◽  
Phase Transitions ◽  
Order Phase Transition ◽  
Alkyl Chain ◽  
Alkyl Chain Length ◽  
Potassium Sulfate ◽  
First Order ◽  
Potassium Laurate ◽  
First Order Phase Transition ◽  
First Order Phase

GRAVITATIONAL WAVES FROM COSMOLOGICAL PHASE TRANSITIONS

2009 ◽  
Vol 24 (08n09) ◽  
pp. 1541-1544
Author(s):  
ARIEL MÉGEVAND
Keyword(s):  
Phase Transition ◽  
Phase Transitions ◽  
Gravitational Waves ◽  
Order Phase Transition ◽  
Gravitational Radiation ◽  
First Order ◽  
First Order Phase Transition ◽  
First Order Phase

I discuss the gravitational radiation produced in a first-order phase transition due to the turbulence that is caused by bubble expansion. I compare the cases of deflagration and detonation bubbles.

Modeling of Phase Transitions Kinetics in Systems with Two Interacting Order Parameters

2016 ◽  
Vol 845 ◽  
pp. 166-169 ◽  
Author(s):  
Dmitry A. Kuzmin ◽  
Igor V. Bychkov ◽  
Ivan Yu. Biryukov ◽  
Alexander P. Kamantsev ◽  
Victor V. Koledov ◽  
...  
Keyword(s):  
Phase Transition ◽  
Phase Transitions ◽  
Order Phase Transition ◽  
Transition Process ◽  
Order Parameters ◽  
First Order ◽  
First Order Phase Transition ◽  
1D Model ◽  
Coupled Solution ◽  
First Order Phase

We present common 1D model of first order phase transition based on coupled solution of order parameters evolution and heat transfer equations. Such a model may be used for simulation of phase transitions in multiferroics or magnetostructural phase transitions, for example. First order phase transition process has been described by Landau-Khalatnikov-like equation with the thermodynamic potential of 2-3-4 and 2-4-6 types.

scholarly journals Phase transitions in neutron stars

2018 ◽  
Vol 27 (11) ◽  
pp. 1830008 ◽  
Author(s):  
V. Dexheimer ◽  
L. T. T. Soethe ◽  
J. Roark ◽  
R. O. Gomes ◽  
S. O. Kepler ◽  
...  
Keyword(s):  
Phase Transition ◽  
Phase Transitions ◽  
Equation Of State ◽  
Neutron Stars ◽  
Order Phase Transition ◽  
Dense Matter ◽  
First Order ◽  
The Core ◽  
First Order Phase Transition ◽  
First Order Phase

In this paper, we review the most common descriptions for the first-order phase transition to deconfined quark matter in the core of neutron stars. We also present a new description of these phase transitions in the core of proto-neutron stars, in which more constraints are enforced so as to include trapped neutrinos. Finally, we calculate the emission of gravitational waves associated with deconfinement phase transitions, discuss the possibility of their detection, and how this would provide information about the equation of state of dense matter.

scholarly journals Dark confinement and chiral phase transitions: gravitational waves vs matter representations

2022 ◽  
Vol 2022 (1) ◽  
Author(s):  
Manuel Reichert ◽  
Francesco Sannino ◽  
Zhi-Wei Wang ◽  
Chen Zhang
Keyword(s):  
Phase Transition ◽  
Phase Transitions ◽  
Gravitational Wave ◽  
Order Phase Transition ◽  
Coupled Models ◽  
Chiral Phase ◽  
Strongly Coupled ◽  
First Order ◽  
First Order Phase Transition ◽  
First Order Phase

Abstract We study the gravitational-wave signal stemming from strongly coupled models featuring both, dark chiral and confinement phase transitions. We therefore identify strongly coupled theories that can feature a first-order phase transition. Employing the Polyakov-Nambu-Jona-Lasinio model, we focus our attention on SU(3) Yang-Mills theories featuring fermions in fundamental, adjoint, and two-index symmetric representations. We discover that for the gravitational-wave signals analysis, there are significant differences between the various representations. Interestingly we also observe that the two-index symmetric representation leads to the strongest first-order phase transition and therefore to a higher chance of being detected by the Big Bang Observer experiment. Our study of the confinement and chiral phase transitions is further applicable to extensions of the Standard Model featuring composite dynamics.

ON THE THEORY OF FIRST-ORDER PHASE TRANSITION IN ORDER-DISORDER FERROELECTRICS

1992 ◽  
Vol 06 (08) ◽  
pp. 1181-1192 ◽  
Author(s):  
J.M. WESSELINOWA ◽  
M.S. MARINOV
Keyword(s):  
Phase Transition ◽  
Phase Transitions ◽  
Ising Model ◽  
Order Phase Transition ◽  
Transverse Field ◽  
Spin Interaction ◽  
Relative Polarization ◽  
First Order ◽  
First Order Phase Transition ◽  
First Order Phase

Based on the Hamiltonian of the Ising model in a transverse field, we have considered the four-spin interaction which is responsible for the first-order phase transition observed in order-disorder ferroelectrics. Using the method of the retarded Green’s function we have determined the relative polarization, the spin-wave energy, the transverse and longitudinal damping. They are numerically calculated and discussed for different temperature and tunneling frequency values in the cases of first- and second-order phase transitions.

Preparation of Different Solid CsHSO4 Phases by Means of Sample Treatment

1986 ◽  
Vol 41 (5) ◽  
pp. 733-736 ◽  
Author(s):  
Bogdan Baranowski ◽  
Milan Friesel ◽  
Arnold Lundén
Keyword(s):  
Phase Transition ◽  
Phase Transitions ◽  
Order Phase Transition ◽  
Energy State ◽  
Enthalpy Change ◽  
Low Energy ◽  
Sample Treatment ◽  
First Order ◽  
First Order Phase Transition ◽  
First Order Phase

Grinding of CsHSO4 can create a low-energy state which relaxes at 375 K by a first order phase transition with an endothermic enthalpy change of 1.14kJ/mol. The formed low-energy state can be transferred by one-dimensional pressure to a higher energy state which relaxes at 333 K by a first order phase transition with an endothermic enthalpy change of 0.55 kJ/mol. This striking - previously unknown - behaviour is probably not limited to CsHSO4 only, and it represents a new class of phase transitions. The involvement of the hydrogen bond present and the importance of water content are stressed. The temperatures and enthalpies of all three phase transitions of CsHSO4 are determined by DSC.

Phase Transitions

2017 ◽  
Author(s):  
Jochen Rau
Keyword(s):  
Phase Transition ◽  
Phase Transitions ◽  
Latent Heat ◽  
Order Phase Transition ◽  
Necessary Conditions ◽  
Discontinuous Change ◽  
First Order ◽  
First Order Phase Transition ◽  
Coexistence Of Phases ◽  
First Order Phase

At a phase transition two or more different phases may coexist, such as vapour and liquid. Phase transitions can be classified according to their order. A phase transition is of first order if going from one phase to the other involves a discontinuous change in entropy, and, thus, a finite amount of latent heat; higher-order phase transitions do not involve latent heat but exhibit other types of discontinuities. This chapter investigates the necessary conditions for the coexistence of phases, and how phases are represented in a phase diagram. The order of a phase transition is defined with the help of the Ehrenfest classification. The chapter discusses the Clausius–Clapeyron relation which, for a first-order phase transition, relates the discontinuous changes in entropy and volume. Finally, this chapter considers the Ising ferromagnet as a simple model which exhibits a second-order phase transition. It also introduces the notion of an order parameter.

scholarly journals Gravitational wave signals of dark matter freeze-out

2021 ◽  
Vol 2021 (2) ◽  
Author(s):  
Danny Marfatia ◽  
Po-Yan Tseng
Keyword(s):  
Phase Transition ◽  
Dark Matter ◽  
Gravitational Waves ◽  
Order Phase Transition ◽  
First Order ◽  
Stochastic Background ◽  
First Order Phase Transition ◽  
Relic Abundance ◽  
First Order Phase ◽  
Freeze Out

Abstract We study the stochastic background of gravitational waves which accompany the sudden freeze-out of dark matter triggered by a cosmological first order phase transition that endows dark matter with mass. We consider models that produce the measured dark matter relic abundance via (1) bubble filtering, and (2) inflation and reheating, and show that gravitational waves from these mechanisms are detectable at future interferometers.

Sign in / Sign up

Export Citation Format

Share Document