8,424 research outputs found
Peak-Dip-Hump from Holographic Superconductivity
We study the fermionic spectral function in a holographic superconductor
model. At zero temperature, the black hole has zero horizon and hence the
entropy of the system is zero after the back reaction of the condensate is
taken into account. We find the system exhibits the famous peak-dip-hump
lineshape with a sharp low-energy peak followed by a dip then a hump at higher
energies. This feature is widely observed in the spectrum of several high-T_c
superconductors. We also find a linear relation between the gap in the
fermionic spectrum and the condensate, indicating the condensate is formed by
fermion pairing.Comment: 4 pages, revtex
The nature of states from a combined analysis of and
With a combined analysis of data on and in an effective field theory approach, we determine resonance
parameters of states in two scenarios. In one scenario we assume that
states are pure molecular states, while in the other one we assume that
states contain compact components. We find that the present data favor
that there should be some compact components inside associated
with the molecular components. By fitting the invariant mass spectra of
and , we determine that the probability of finding the
compact components in states may be as large as about .Comment: Discussions added, version published in EPJ
Dynamic Interrelation of Births and Deaths: Evidence from Plant Level Data
In this paper, the dynamic panel data method is used to investigate the dynamic interrelation of plant births and plant deaths. The dynamic panel data method considers the endogenous problem and individual effects. Empirical findings support the multiplier effect. In addition, exit does not cause entry, whereas entry causes exit.
Ruling out the supersoft high-density symmetry energy from the discovery of PSR J0740+6620 with mass
Using the very recently reported mass of PSR
J0740+6620 together with the data of finite nuclei and the constraints on the
equation of state of symmetric nuclear matter at suprasaturation densities from
flow data in heavy-ion collisions, we show that the symmetry energy cannot be supersoft so that it becomes negative at suprasaturation
densities in neutron stars (NSs) and thus may make the NS have a pure neutron
matter core. This is in contrast to the fact that using the mass of PSR J0348+0432 as the NS maximum mass cannot rule out the supersoft
high-density . Furthermore, we find the stiffer high-density
based on the existence of NSs leads to a strong
constraint of for the dimensionless tidal
deformability of the canonical NS.Comment: 8 pages, 2 figures, 1 table. The updated 2.14 solar mass used,
results updated and presentation improved. Accepted version to appear in Ap
Holographic Mutual Information of Two Disjoint Spheres
We study quantum corrections to holographic mutual information for two
disjoint spheres at a large separation by using the operator product expansion
of the twist field. In the large separation limit, the holographic mutual
information is vanishing at the semiclassical order, but receive quantum
corrections from the fluctuations. We show that the leading contributions from
the quantum fluctuations take universal forms as suggested from the boundary
CFT. We find the universal behavior for the scalar, the vector, the tensor and
the fermionic fields by treating these fields as free fields propagating in the
fixed background and by using the 1/n prescription. In particular, for the
fields with gauge symmetries, including the massless vector boson and massless
graviton, we find that the gauge parts in the propagators play indispensable
role in reading the leading order corrections to the bulk mutual information.Comment: 37 pages, 1 figure; significant revisions, corrected the discussions
on the computations of the mutual information in CFT, conclusions unchange
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