1,199 research outputs found
Giant Fluctuations of Coulomb Drag in a Bilayer System
We have observed reproducible fluctuations of the Coulomb drag, both as a
function of magnetic field and electron concentration, which are a
manifestation of quantum interference of electrons in the layers. At low
temperatures the fluctuations exceed the average drag, giving rise to random
changes of the sign of the drag. The fluctuations are found to be much larger
than previously expected, and we propose a model which explains their
enhancement by considering fluctuations of local electron properties.Comment: 10 pages, 4 figure
Electron-electron interactions in the conductivity of graphene
The effect of electron-electron interaction on the low-temperature
conductivity of graphene is investigated experimentally. Unlike in other
two-dimensional systems, the electron-electron interaction correction in
graphene is sensitive to the details of disorder. A new temperature regime of
the interaction correction is observed where quantum interference is suppressed
by intra-valley scattering. We determine the value of the interaction
parameter, F_0 ~ -0.1, and show that its small value is due to the chiral
nature of interacting electrons.Comment: 4 pages, 4 figures, 1 tabl
Constraints on warm dark matter from UV luminosity functions of high-z galaxies with Bayesian model comparison
The number density of small dark matter (DM) haloes hosting faint high-redshift galaxies is sensitive to the DM free-streaming properties. However, constraining these DM properties is complicated by degeneracies with the uncertain baryonic physics governing star formation. In this work, we use a flexible astrophysical model and a Bayesian inference framework to analyse ultraviolet (UV) luminosity functions (LFs) at z = 6-8. We vary the complexity of the astrophysical galaxy model (single versus double power law for the stellar-halo mass relation) as well as the matter power spectrum [cold DM versus thermal relic warm DM (WDM)], comparing their Bayesian evidences. Adopting a conservatively wide prior range for the WDM particle mass, we show that the UV LFs at z = 6-8 only weakly favour cold DM over WDM. We find that particle masses of ≤ 2 keV are rejected at a 95 per cent credible level in all models that have a WDM-like power spectrum cutoff. This bound should increase to ∼2.5 keV with the James Webb Space Telescope (JWST)
Polar-bulge galaxies
Based on SDSS data, we have selected a sample of nine edge-on spiral galaxies
with bulges whose major axes show a high inclination to the disk plane. Such
objects are called polar-bulge galaxies. They are similar in their morphology
to polar-ring galaxies, but the central objects in them have small size and low
luminosity. We have performed a photometric analysis of the galaxies in the g
and r bands and determined the main characteristics of their bulges and disks.
We show that the disks of such galaxies are typical for the disks of spiral
galaxies of late morphological types. The integrated characteristics of their
bulges are similar to the parameters of normal bulges. The stellar disks of
polar-bulge galaxies often show large-scale warps, which can be explained by
their interaction with neighboring galaxies or external accretion from outside.Comment: 8 pages, 3 figure
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