191,870 research outputs found
Resonating plaquette phases in large spin cold atom systems
Large spin cold atom systems can exhibit novel magnetic properties which do
not appear in usual spin-1/2 systems. We investigate the SU(4) resonating
plaquette state in the three dimensional cubic optical lattice with spin-3/2
cold fermions. A novel gauge field formalism is constructed to describe the
Rokhsar-Kivelson type of Hamiltonian and a duality transformation is used to
study the phase diagram. Due to the proliferation of topological defects, the
system is generally gapped for the whole phase diagram of the quantum model,
which agrees with the recent numerical studies. A critical line is found for
the classical plaquette system, which also corresponds to a quantum many-body
wavefunction in a "plaquette liquid phase".Comment: 6 pages, 3 figure
New class of rotating perfect fluid black holes in three dimensional gravity
We obtain a new class of rotating black holes for Einstein theory with
perfect fluid source in (2+1) dimensions. We conclude that these black hole
solutions only depend on variable angular velocity . Some examples of
these black holes are given explicitly. In particular, the unknown static black
hole in this special background is obtained. In addition, the general
properties including the horizon structure, energy conditions and equation of
state, mass and angular momentum are explained in detail.Comment: 12 pages, no figures; a few references added and typos corrected;
published versio
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