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NANOGrav results and dark first order phase transitions 被引量:1
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作者 Andrea Addazi Yi-Fu Cai +2 位作者 Qingyu Gan Antonino Marciano Kaiqiang Zeng 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS CSCD 2021年第9期9-14,共6页
The recent NANOGrav evidence of a common-source stochastic background provides a hint to gravitational waves(GW)radiation from the Early Universe.We show that this result can be interpreted as a GW spectrum produced f... The recent NANOGrav evidence of a common-source stochastic background provides a hint to gravitational waves(GW)radiation from the Early Universe.We show that this result can be interpreted as a GW spectrum produced from first order phase transitions(FOPTs)around a temperature in the keV-MeV window.Such a class of FOPTs at temperatures much below the electroweak scale can be naturally envisaged in several warm dark matter models such as Majoron dark matter. 展开更多
关键词 gravitational waves first order phase transitions warm dark matter effective field theory
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Connection between Physical Properties in Homologous Series of Molecular Systems 被引量:1
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作者 Dolomatov Michail Yurievich Dezortsev Sergey Vladislavovich 《Journal of Chemistry and Chemical Engineering》 2013年第6期566-572,共7页
The connections between different physical-chemical properties in homologous molecular series are analyzed from the quantum-mechanic and the algebraic theory points of view and are explained by influence of the gage t... The connections between different physical-chemical properties in homologous molecular series are analyzed from the quantum-mechanic and the algebraic theory points of view and are explained by influence of the gage to the quantum electronic continuum. The connection between quantum and macroscopic properties of the substances is confirmed in homologous series of n-alkanes. Linear correlation between the coefficient of magnetization and energy of the highest occupied molecular orbital in homologous series of n-alkanes C2-C10 is established. The connection between diamagnetic and electronic characteristics of n-alkanes with the temperatures of the first order phase transitions (melting point) and other physical-chemical properties were discovered. The nature of interconnection between critical and diamagnetic properties of n-alkanes C2-C10 and results of previous works allow to suppose significant role of the spin interactions in electronic continuum states along the process of the first order phase transitions. 展开更多
关键词 N-ALKANES electronic structure physical-chemical properties band gap width first order phase transitions coefficient ofmagnetization.
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Phase transitions of two spin-1/2 Baxter–Wu layers coupled with Ising-type interactions
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作者 Wei Liu Zhengxin Yan Yixian Wang 《Communications in Theoretical Physics》 SCIE CAS CSCD 2021年第1期99-105,共7页
Using a Monte Carlo simulation and the single histogram reweighting technique,we study the critical behaviors and phase transitions of the Baxter-Wu(BW)model on a two-layer triangular lattice with Ising-type interlaye... Using a Monte Carlo simulation and the single histogram reweighting technique,we study the critical behaviors and phase transitions of the Baxter-Wu(BW)model on a two-layer triangular lattice with Ising-type interlayer couplings.Via the finite-size analysis,we obtain the transition temperatures and critical exponents at repulsive and attractive interlayer couplings.The data for the repulsive interlayer coupling suggest continuous transitions,and the critical behaviors are the same as those of the 2D BW model,belonging to the four-state Potts universality class.The reduced energy cumulants and the histograms reveal that attractive coupling leads to weak firstorder phase transitions.The pseudocritical exponents with the existence of the interlayer couplings indicate that the first-order transition is very close to the critical point of the 2D standard BW model. 展开更多
关键词 Baxter-Wu model Monte Carlo simulation critical behavior weak first order phase transition
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Magnetic properties and magnetocaloric effect in compound PrFe_(12)B_6
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作者 王芳 沈保根 +4 位作者 张健 孙继荣 张健 孟凡斌 李养贤 《Chinese Physics B》 SCIE EI CAS CSCD 2010年第6期513-517,共5页
Magnetic properties and magnetocaloric effect of compound PrFe12B6 are investigated. The coexistence of hard phase PrFe12B6 and soft phase α-Fe causes interesting phenomena on the curves for the temperature dependenc... Magnetic properties and magnetocaloric effect of compound PrFe12B6 are investigated. The coexistence of hard phase PrFe12B6 and soft phase α-Fe causes interesting phenomena on the curves for the temperature dependence of magnetization. PrFe12B6 experiences a first order phase transition at the Curie temperature 206 K, accompanied by an obvious lattice contraction, which in turn results in a large magnetic entropy change. The Maxwell relation fails to give the correct information about magnetic entropy change due to the first order phase transition nature. The large magnetic entropy changes of PrFe12.3B4.7 obtained from heat capacity method are 11.7 and 16.2 J/kg.K for magnetic field changes of 0-2 T and 0-5 T respectively. 展开更多
关键词 magnetic properties magnetic entropy change first order phase transition
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Charged pion condensation in anti-parallel electromagnetic fields and nonzero isospin density
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作者 Jingyi Chao Mei Huang Andrey Radzhabov 《Chinese Physics C》 SCIE CAS CSCD 2020年第3期101-110,共10页
The formation of charged pion condensate in anti-parallel electromagnetic fields and in the presence of the isospin chemical potential is studied in the two-flavor Nambu-Jona-Lasinio model.The method of Schwinger prop... The formation of charged pion condensate in anti-parallel electromagnetic fields and in the presence of the isospin chemical potential is studied in the two-flavor Nambu-Jona-Lasinio model.The method of Schwinger proper time is extended to explore the quantities in the off-diagonal flavor space,i.e.the charged pion.In this framework,π^± are treated as bound states of quarks and not as point-like charged particles.The isospin chemical potential plays the role of a trigger for charged pion condensation.We obtain the associated effective potential as a function of the strength of the electromagnetic fields and find that it contains a sextic term which possibly induces a weak first order phase transition.The dependence of pion condensation on model parameters is investigated. 展开更多
关键词 pion condensate electromagnetic fields weakly first order phase transition
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