11,909 research outputs found
Vortex description of the fractionalized phase in exciton bose condensate
As a sequel to the previous work [Phys. Rev. B 72, 235104 (2005)] we present
a vortex description of the fractionalized phase in exciton bose condensate.
Magnetic flux line and monopole of the 3+1D emergent U(1) gauge theory are
identified in the exciton picture. A bundle of vortex/anti-vortex pairs of all
flavors of excitons corresponds to the magnetic flux line and a point at which
the vortices and anti-vortices recombine is identified as magnetic monopole.
This completes the magnetic sector of the low energy excitation in the
fractionalized phase.Comment: 8 pages, 6 figures; clarification made in introductio
A Supersymmetric U(1)' Model with Multiple Dark Matters
We consider a scenario where a supersymmetric model has multiple dark matter
particles. Adding a U(1)' gauge symmetry is a well-motivated extension of the
Minimal Supersymmetric Standard Model (MSSM). It can cure the problems of the
MSSM such as the mu-problem or the proton decay problem with high-dimensional
lepton number and baryon number violating operators which R-parity allows. An
extra parity (U-parity) may arise as a residual discrete symmetry after U(1)'
gauge symmetry is spontaneously broken. The Lightest U-parity Particle (LUP) is
stable under the new parity becoming a new dark matter candidate. Up to three
massive particles can be stable in the presence of the R-parity and the
U-parity. We numerically illustrate that multiple stable particles in our model
can satisfy both constraints from the relic density and the direct detection,
thus providing a specific scenario where a supersymmetric model has
well-motivated multiple dark matters consistent with experimental constraints.
The scenario provides new possibilities in the present and upcoming dark matter
searches in the direct detection and collider experiments.Comment: 25 pages, 5 figure
A Non-Fermi Liquid from a Charged Black Hole; A Critical Fermi Ball
Using the AdS/CFT correspondence, we calculate a fermionic spectral function
in a 2+1 dimensional non-relativistic quantum field theory which is dual to a
gravitational theory in the background with a charged black hole. The
spectral function shows no quasiparticle peak but the Fermi surface is still
well defined. Interestingly, all momentum points inside the Fermi surface are
critical and the gapless modes are defined in a {\it critical Fermi ball} in
the momentum space.Comment: v3) discussion on the singular nature of the zero energy peak added;
to appear in Phys. Rev.
Substructure of high-p_T Jets at the LHC
We study high-pt jets from QCD and from highly-boosted massive particles such
as tops, W, Z and Higgs, and argue that infrared-safe observables can help
reduce QCD backgrounds. Jets from QCD are characterized by different patterns
of energy flow compared to the products of highly-boosted heavy particle
decays, and we employ a variety of jet shapes, observables restricted to energy
flow within a jet, to explore this difference. Results from Monte Carlo
generators and arguments based on perturbation theory support the
discriminating power of the shapes we refer to as planar flow and angularities.
We emphasize that for massive jets, these and other observables can be analyzed
perturbatively.Comment: 5 pages and 4 figure
{BOAO Photometric Survey of Galactic Open Clusters. II. Physical Parameters of 12 Open Clusters
We have initiated a long-term project, the BOAO photometric survey of open
clusters, to enlarge our understanding of galactic structure using UBVI CCD
photometry of open clusters which have been little studied before. This is the
second paper of the project in which we present the photometry of 12 open
clusters. We have determined the cluster parameters by fitting the Padova
isochrones to the color-magnitude diagrams of the clusters. All the clusters
except for Be 0 and NGC 1348 are found to be intermediate-age to old (0.2 - 4.0
Gyrs) open clusters with a mean metallicity of [Fe/H] = 0.0.Comment: 11 page
Localized tachyon condensation and G-parity conservation
We study the condensation of localized tachyon in non-supersymmetric orbifold
{\C^2/\Z_n}. We first show that the G-parities of chiral primaries are
preserved under the condensation of localized tachyon(CLT) given by the chiral
primaries. Using this, we finalize the proof of the conjecture that the
lowest-tachyon-mass-squared increases under CLT at the level of type II string
with full consideration of GSO projection. We also show the equivalence between
the -parity given by coming from partition function
and that given by coming from the monomial
construction for the chiral primaires in the dual mirror picture.Comment: 12 pages, 2 figures, final form to appear in JHE
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