23,199 research outputs found
Scaling of Coulomb pseudo-potential in s-wave narrow-band superconductors
The Coulomb pseudo-potential is extracted by fitting the numerically
calculated transition temperature of the Eliashberg-Nambu equation which
is extended to incorporate the narrow-band effects, that is, the vertex
correction and the frequency dependence of the screened Coulomb interaction. It
is shown that even for narrow-band superconductors, where the fermi energy is comparable with the phonon frequency , the Coulomb
pseudo-potential is a pertinent parameter, and is still given by , provided is
appropriately scaled.Comment: 5 pages, 3 figures, accepted for publication by Phys. Rev.
Probing Gravitational Lensing of the CMB with SDSS-IV Quasars
We study the cross-correlation between the Planck CMB lensing convergence map
and the eBOSS quasar overdensity obtained from the Sloan Digital Sky Survey
(SDSS) IV, in the redshift range . We detect the CMB lensing
convergence-quasar cross power spectrum at significance. The cross
power spectrum provides a quasar clustering bias measurement that is expected
to be particularly robust against systematic effects. The redshift distribution
of the quasar sample has a median redshift , and an effective
redshift about . The best fit bias of the quasar sample is , corresponding to a host halo mass of . This is broadly
consistent with the previous literature on quasars with a similar redshift
range and selection. Since our constraint on the bias comes from the
cross-correlation between quasars and CMB lensing, we expect it to be robust to
a wide range of possible systematic effects that may contaminate the auto
correlation of quasars. We checked for a number of systematic effects from both
CMB lensing and quasar overdensity, and found that all systematics are
consistent with null within . The data is not sensitive to a possible
scale dependence of the bias at present, but we expect that as the number of
quasars increases (in future surveys such as DESI), it is likely that strong
constraints on the scale dependence of the bias can be obtained.Comment: 8 pages, 6 figures, 1 table; matches published version on MNRA
Band Gap Closing in a Synthetic Hall Tube of Neutral Fermions
We report the experimental realization of a synthetic three-leg Hall tube
with ultracold fermionic atoms in a one-dimensional optical lattice. The legs
of the synthetic tube are composed of three hyperfine spin states of the atoms,
and the cyclic inter-leg links are generated by two-photon Raman transitions
between the spin states, resulting in a uniform gauge flux penetrating
each side plaquette of the tube. Using quench dynamics, we investigate the band
structure of the Hall tube system for a commensurate flux .
Momentum-resolved analysis of the quench dynamics reveals that a critical point
of band gap closing as one of the inter-leg coupling strengths is varied, which
is consistent with a topological phase transition predicted for the Hall tube
system.Comment: 8 pages, 8 figure
Protein transduction: A novel tool for tissue regeneration
Tissue regeneration in humans is limited and excludes vitals organs like heart and brain. Transformation experiments with oncogenes like T antigen have shown that retrodifferentiation of the respective cells is possible but hard to control. To bypass the risk of cancer formation a protein therapy approach has been developed. The transient delivery of proteins rather than genes could still induce terminallydifferentiated cells to reenter the cell cycle. This approach takes advantage of proteintransducing domains that mediate the transfer of cargo proteins into cells. The goal of this brief review is to outline the basics of protein transduction and to discuss potential applications for tissue regeneration
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