9,193 research outputs found
Stability of Horava-Lifshitz Black Holes in the Context of AdS/CFT
The anti--de Sitter/conformal field theory (AdS/CFT) correspondence is a
powerful tool that promises to provide new insights toward a full understanding
of field theories under extreme conditions, including but not limited to
quark-gluon plasma, Fermi liquid and superconductor. In many such applications,
one typically models the field theory with asymptotically AdS black holes.
These black holes are subjected to stringy effects that might render them
unstable. Ho\v{r}ava-Lifshitz gravity, in which space and time undergo
different transformations, has attracted attentions due to its power-counting
renormalizability. In terms of AdS/CFT correspondence, Ho\v{r}ava-Lifshitz
black holes might be useful to model holographic superconductors with Lifshitz
scaling symmetry. It is thus interesting to study the stringy stability of
Ho\v{r}ava-Lifshitz black holes in the context of AdS/CFT. We find that
uncharged topological black holes in Ho\v{r}ava-Lifshitz theory are
nonperturbatively stable, unlike their counterparts in Einstein gravity, with
the possible exceptions of negatively curved black holes with detailed balance
parameter close to unity. Sufficiently charged flat black holes for
close to unity, and sufficiently charged positively curved black
holes with close to zero, are also unstable. The implication to the
Ho\v{r}ava-Lifshitz holographic superconductor is discussed.Comment: 15 pages, 6 figures. Updated version accepted by Phys. Rev. D, with
corrections to various misprints. References update
The Lorenz number in CeCoIn inferred from the thermal and charge Hall currents
The thermal Hall conductivity and Hall conductivity
in CeCoIn are used to determine the Lorenz number at low temperature . This enables the separation of the observed
thermal conductivity into its electronic and non-electronic parts. We uncover
evidence for a charge-neutral, field-dependent thermal conductivity, which we
identify with spin excitations. At low , these excitations dominate the
scattering of charge carriers. We show that suppression of the spin excitations
in high fields leads to a steep enhancement of the electron mean-free-path,
which leads to an interesting scaling relation between the magnetoresistance,
thermal conductivity and .Comment: 6 pages, 7 figures Intro para slightly lengthened. Added 2 new re
Phase coherence and the Nernst effect at magic angles in organic conductors
A giant Nernst signal was recently observed for fields near crystallographic
directions in (TMTSF)PF. Such large Nernst signals are most naturally
associated with the motion of pancake vortices. We propose a model in which
phase coherence is destroyed throughout the sample except in planes closely
aligned with the applied field . A small tilt above or below the plane
changes the direction and density of the penetrating vortices and leads to a
Nernst signal that varies with the tilt angle of as observed. The
resistance notches at magic angles are understood in terms of flux-flow
dissipation from field-induced vortices.Comment: 4 pages, 4 figure
Pandangan Etnis Tionghoa Surabaya terhadap Budaya Penggunaan Arak 泗水华裔对运用酒文化之观点
Oleh karena arak di Tiongkok selain memiliki sejarah budaya penggunaan yang panjang, jenis-jenisnya banyak, dan juga digunakan dalam proses pengobatan tradisional, penelitian ini ingin menganalisis bagaimana pandangan etnis Tionghoa Surabaya terhadap budaya penggunaan arak. Apakah masih seperti yang dikatakan dalam kajian pustaka yang digunakan dalam penelitian ini, ataukah sudah ada Perubahan dalam budaya penggunaannya. Kajian pustaka yang digunakan meliputi: budaya minum arak bagi kaum perempuan; penggunaan arak dalam perayaan-perayaan tertentu; makna arak bagi kaum sastrawan; manfaat arak dalam kesehatan. Metode penelitian yang digunakan adalah kualitatif deskriptif. Hasil analisis menunjukkan bahwa ada budaya penggunaan arak yang masih sama seperti yang ditulis dalam kajian pustaka, ada yang sudah mengalami Perubahan
The Concentration of Manganese, Copper, Zinc, Lead and Thorium in Sediments of Paka Estuary,Terengganu, Malaysia
14 cm cores sediments from the Paka River were analyzed for Mn, Cu, Zn, Pb
and Th using the inductively coupled plasma mass spectrometer (ICP-MS).
Generally, the concentrations of all elements decreased with depth and have
significantly higher concentration at the surface depth of the core. The
concentration of Mn and Cu have average value of 151.1 ± 59.1 mg/g dry
weights and 29.2 ± 6.9 mg/g dry weights, while Zn and Pb averaged at 72.5 ±
15.5 mg/g dry weights and 54.9 ± 2.5 mg/g dry weights, respectively. Th were
slightly varied widely and ranged from 0.6 mg/g dry weights to 1.4 mg/g dry
weights. In this study, only Mn and Th have enrichment factor (EF) values close
to unity and may therefore be considered to be predominantly terrigenous in
origin. On the contrary, the higher EF values found for Cu, Zn and Pb indicate
that these metals might have some influenced from the anthropogenic inpu
Evaluating the possibility of detecting evidence of positive selection across Asia with sparse genotype data from the HUGO Pan-Asian SNP Consortium
10.1186/1471-2164-15-332BMC Genomics151-BGME
The Nernst effect in high- superconductors
The observation of a large Nernst signal in an extended region above
the critical temperature in hole-doped cuprates provides evidence that
vortex excitations survive above . The results support the scenario that
superfluidity vanishes because long-range phase coherence is destroyed by
thermally-created vortices (in zero field), and that the pair condensate
extends high into the pseudogap state in the underdoped (UD) regime. We present
a series of measurements to high fields which provide strong evidence for
this phase-disordering scenario.Comment: 21 pages, 28 figure
A dipole lattice model of switching characteristics in ferroelectric superlattices
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