The Experts below are selected from a list of 237 Experts worldwide ranked by ideXlab platform
Masanobu Yahiro - One of the best experts on this subject based on the ideXlab platform.
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Spontaneous parity and Charge-Conjugation violations at real isospin and imaginary baryon chemical potentials
Physical Review D, 2012Co-Authors: Hiroaki Kouno, Mizuho Kishikawa, Takahiro Sasaki, Yuji Sakai, Masanobu YahiroAbstract:The phase structure of two-flavor QCD is investigated at real isospin and imaginary quark chemical potentials by using the Polyakov-loop extended Nambu‐Jona-Lasinio model. In the region, parity symmetry is spontaneously broken by the pion superfluidity phase transi tion, whereas Charge-Conjugation symmetry is spontaneously violated by the Roberge-Weiss transition. The chiral (deconfinement) crossover at zero isospin and quark chemical potentials is a remnant of the parity (Charge -Conjugation) violation. The interplay between the parity and Charge-Conjugation violations are analyzed, an d it is investigated how the interplay is related to the correlation between the chiral and deconfinement crossover s at zero isospin and quark chemical potentials.
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Violations of parity and Charge Conjugation in the θ vacuum with imaginary chemical potential
Physical Review D, 2011Co-Authors: Hiroaki Kouno, Takahiro Sasaki, Yuji Sakai, Kouji Kashiwa, Masanobu YahiroAbstract:Charge Conjugation ($C$) and parity ($P$) are exact symmetries at $\ensuremath{\theta}=\ensuremath{\pi}$ and $\ensuremath{\Theta}\ensuremath{\equiv}\ensuremath{\mu}/(iT)=\ensuremath{\pi}$, where $\ensuremath{\theta}$ is the parameter of the so-called $\ensuremath{\theta}$ vacuum, $\ensuremath{\mu}$ is the imaginary quark-number chemical potential and $T$ is the temperature. Spontaneous breakings of these discrete symmetries are investigated by the Polyakov-loop extended Nambu--Jona-Lasinio model. At zero $T$, $P$ symmetry is spontaneously broken while $C$ symmetry is conserved. As $T$ increases, $P$ symmetry is restored just after $C$ symmetry is spontaneously broken, so that either $P$ or $C$ symmetry or both the symmetries are spontaneously broken for any $T$. The chiral-symmetry restoration and the deconfinement transition at $\ensuremath{\theta}=\ensuremath{\Theta}=0$ are remnants of the $P$ restoration and the $C$ breaking at $\ensuremath{\theta}=\ensuremath{\Theta}=\ensuremath{\pi}$, respectively.
Henning Schomerus - One of the best experts on this subject based on the ideXlab platform.
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The role of Charge Conjugation symmetry in topological photonics
2016 Progress in Electromagnetic Research Symposium (PIERS), 2016Co-Authors: Henning SchomerusAbstract:In systems with suitable symmetries, topologically protected states can arise that are immune to perturbations. We discuss how the properties of such states can be enriched via the Charge-Conjugation symmetry, which in condensed-matter physics is associated with Majorana quasiparticles in a superconductor. In particular, this symmetry plays a central role in the selective amplification of topologically protected states.
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topologically protected defect states in open photonic systems with non hermitian Charge Conjugation and parity time symmetry
Physical Review Letters, 2015Co-Authors: Simon Malzard, Charles Poli, Henning SchomerusAbstract:We show that topologically protected defect states can exist in open (leaky or lossy) systems even when these systems are topologically trivial in the closed limit. The states appear from within the continuum, thus in the absence of a band gap, and are generated via exceptional points (a spectral transition that occurs in open wave and quantum systems with a generalized time-reversal symmetry), or via a degeneracy induced by Charge-Conjugation symmetry (which is related to the pole transition of Majorana zero modes). We demonstrate these findings for a leaking passive coupled-resonator optical waveguide with asymmmetric internal scattering, where the required symmetries (non-Hermitian versions of time-reversal symmetry, chirality, and Charge Conjugation) emerge dynamically.
L. C. Liu - One of the best experts on this subject based on the ideXlab platform.
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A Charge-Conjugation-Invariance Constrained Pomeron-Quark Coupling
Nuclear Physics A, 2005Co-Authors: L. C. LiuAbstract:Abstract The commonly used γ μ Pomeron-quark coupling changes its sign under Charge Conjugation, in contradiction to the property of Pomeron. I show that the Pomeron-quark coupling is tensorial and is invariant under the Charge Conjugation.
Li Xueqian - One of the best experts on this subject based on the ideXlab platform.
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parity Charge Conjugation and su 3 constraints on threshold enhancement in j psi decays into gamma pp and kp lambda
Physical Review D, 2005Co-Authors: He Xiaogang, Li XueqianAbstract:We study the threshold enhancement effects of baryon-antibaryon systems in J/{psi} decays at BES using parity P, Charge Conjugation C, and flavor SU(3) symmetries. The P and C symmetries restrict the pp in J/{psi}{yields}{gamma}pp to be in a state with C=+1, while the pp in J/{psi}{yields}{pi}{sup 0}pp to be with C=-1. Combining the C and P symmetries with flavor SU(3) symmetry, i.e., the CPS symmetry, we find that the {lambda}p system cannot be in 0{sup +} and 0{sup -} states in J/{psi}{yields}K{sup +}{lambda}p. We provide a consistent explanation of observation and nonobservation of near threshold enhancements in J/{psi}{yields}K{sup +}{lambda}p and J/{psi}{yields}{pi}{sup 0}pp, respectively. We also find that near baryon pair threshold enhancement can happen in several channels for J/{psi} decays and can be several times larger than that observed in J/{psi}{yields}K{sup +}{lambda}p in some channels.
Niels A. Obers - One of the best experts on this subject based on the ideXlab platform.
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Two Large Examples in Orbifold Theory: Abelian Orbifolds and the Charge Conjugation Orbifold on su(n)
International Journal of Modern Physics A, 2002Co-Authors: M. B. Halpern, Niels A. ObersAbstract:Recently the operator algebra and twisted vertex operator equations were given for each sector of all WZW orbifolds, and a set of twisted KZ equations for the WZW permutation orbifolds were worked out as a large example. In this companion paper we report two further large examples of this development. In the first example we solve the twisted vertex operator equations in an Abelian limit to obtain the twisted vertex operators and correlators of a large class of Abelian orbifolds. In the second example, the twisted vertex operator equations are applied to obtain a set of twisted KZ equations for the (outer-automorphic) Charge Conjugation orbifold on .
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two large examples in orbifold theory abelian orbifolds and the Charge Conjugation orbifold on su n
arXiv: High Energy Physics - Theory, 2002Co-Authors: M. B. Halpern, Niels A. ObersAbstract:Recently the operator algebra and twisted vertex operator equations were given for each sector of all WZW orbifolds, and a set of twisted KZ equations for the WZW permutation orbifolds were worked out as a large example. In this companion paper we report two further large examples of this development. In the first example we solve the twisted vertex operator equations in an abelian limit to obtain the twisted vertex operators and correlators of a large class of abelian orbifolds. In the second example, the twisted vertex operator equations are applied to obtain a set of twisted KZ equations for the (outer-automorphic) Charge Conjugation orbifold on su(n \geq 3).