9,716 research outputs found
Homogeneous right coideal subalgebras of quantized enveloping algebras
For a quantized enveloping algebra of a complex semisimple Lie algebra with
deformation parameter not a root of unity, we classify all homogeneous right
coideal subalgebras. Any such right coideal subalgebra is determined uniquely
by a triple consisting of two elements of the Weyl group and a subset of the
set of simple roots satisfying some natural conditions. The essential
ingredients of the proof are the Lusztig automorphisms and the classification
of homogeneous right coideal subalgebras of the Borel Hopf subalgebras of
quantized enveloping algebras obtained previously by H.-J. Schneider and the
first named author.
Key words: Quantum groups, coideal subalgebras, Weyl group, weak orderComment: 13 page
Podle\'s' Quantum Sphere: Dual Coalgebra and Classification of Covariant First Order Differential Calculus
The dual coalgebra of Podle\'s' quantum sphere O_q(S^2_c) is determined
explicitly. This result is used to classify all finite dimensional covariant
first order differential calculi over O_q(S^2_c) for all but exceptional values
of the parameter c.Comment: LaTeX2e, 19 page
GUT baryogenesis after preheating: numerical study of the production and decay of X-bosons
We perform a fully non-linear calculation of the production of supermassive
Grand Unified Theory (GUT) bosons during preheating, taking into account
the fact that they are unstable with a decay width . We show that
parametric resonance does not develop if is larger than about
. We compute the nonthermal number density of superheavy bosons
produced in the preheating phase and demonstrate that the observed baryon
asymmetry may be explained by GUT baryogenesis after preheating if
is smaller than about .Comment: 13 pages, LaTeX file, 3 figures. One reference added and minor
change
Photon decay in strong magnetic field in heavy-ion collisions
We calculate the photon pair production rate in strong magnetic field created
in off-central heavy-ion collisions. Photon decay leads to depletion of the
photon yield by a few percent at RHIC and by as much as 20% at the LHC. It also
generates a substantial azimuthal asymmetry ("elliptic flow") of the final
photon distribution. We estimate v_2~2% at RHIC and v_2~14% at LHC. Photon
decay measurements is an important tool for studying the magnetic fields in
early stages of heavy-ion collisions.Comment: 6 pages, 3 figure
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