163,363 research outputs found
Identical Particles and Quantum Symmetries
We propose a solution to the problem of compatibility of Bose-Fermi
statistics with symmetry transformations implemented by compact quantum groups
of Drinfel'd type. We use unitary transformations to conjugate multi-particle
symmetry postulates, so as to obtain a twisted realization of the symmetric
groups S_n.Comment: latex, 30 pages; final version (Nucl. Phys. B, in print
PT-symmetry and its spontaneous breakdown explained by anti-linearity
The impact of an anti-unitary symmetry on the spectrum of non-Hermitian operators is studied. Wigner's normal form of an anti-unitary operator accounts for the spectral properties of non-Hermitian, PE-symmetric Harniltonians. The occurrence of either single real or complex conjugate pairs of eigenvalues follows from this theory. The corresponding energy eigenstates span either one- or two-dimensional irreducible representations of the symmetry PE. In this framework, the concept of a spontaneously broken PE-symmetry is not needed
Oriented Associativity Equations and Symmetry Consistent Conjugate Curvilinear Coordinate Nets
This paper is devoted to description of the relationship among oriented
associativity equations, symmetry consistent conjugate curvilinear coordinate
nets, and the widest associated class of semi- Hamiltonian hydrodynamic-type
systems.Comment: 19 page
Carbon K-shell Photo Ionization of CO: Molecular frame angular Distributions of normal and conjugate shakeup Satellites
We have measured the molecular frame angular distributions of photoelectrons
emitted from the Carbon K shell of fixed-in-space CO molecules for the case of
simultaneous excitation of the remaining molecular ion. Normal and conjugate
shake up states are observed. Photo electrons belonging to normal \Sigma
-satellite lines show an angular distribution resembling that observed for the
main photoline at the same electron energy. Surprisingly a similar shape is
found for conjugate shake up states with \Pi -symmetry. In our data we identify
shake rather than electron scattering (PEVE) as the mechanism producing the
conjugate lines. The angular distributions clearly show the presence of a
\Sigma -shape resonance for all of the satellite lines.Comment: 8 pages, 2 figure
Conjugate coupling induced symmetry breaking and quenched oscillations
Spontaneous symmetry breaking (SSB) is essential and plays a vital role many
natural phenomena, including the formation of Turing pattern in organisms and
complex patterns in brain dynamics. In this work, we investigate whether a set
of coupled Stuart-Landau oscillators can exhibit spontaneous symmetry breaking
when the oscillators are interacting through dissimilar variables or conjugate
coupling. We find the emergence of SSB state with coexisting distinct dynamical
states in the parametric space and show how the system transits from symmetry
breaking state to out-of-phase synchronized (OPS) state while admitting
multistabilities among the dynamical states. Further, we also investigate the
effect of feedback factor on SSB as well as oscillation quenching states and we
point out that the decreasing feedback factor completely suppresses SSB and
oscillation death states. Interestingly, we also find the feedback factor
completely diminishes only symmetry breaking oscillation and oscillation death
(OD) states but it does not affect the nontrivial amplitude death (NAD) state.
Finally, we have deduced the analytical stability conditions for in-phase and
out-of-phase oscillations, as well as amplitude and oscillation death states.Comment: Accepted for publication in Europhysics Letter
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