4,746 research outputs found
Global Strategy for the Conservation and Use of Capsicum Genetic Resources
This document aims to provide a framework for the efficient and effective conservation of genetic resources of Capsicum crops.
The development of this Global Crop Conservation Strategy was funded by the Government of Germany (BMEL) as part of the three-year project led by the Crop Trust: “Breathing new life into the Global Crop Conservation Strategies". The Crop Trust also cooperated with the Secretariat of The International Treaty on Plant Genetic Resources for Food and Agriculture (ITPGRFA) in the development of this document.Supplementary data: Supplementary data for Barchenger D.W. and Khoury C.K. 2022. A Global Strategy for the Conservation and Use of Capsicum Genetic Resources. Global Crop Diversity Trust. Bonn, Germany. DOI: 10.22001/wvc.74702 (https:// worldveg.tind.io/record/74702
New Ekpyrotic Cosmology
In this paper, we present a new scenario of the early Universe that contains
a pre big bang Ekpyrotic phase. By combining this with a ghost condensate, the
theory explicitly violates the null energy condition without developing any
ghost-like instabilities. Thus the contracting universe goes through a
non-singular bounce and evolves smoothly into the expanding post big bang
phase. The curvature perturbation acquires a scale-invariant spectrum well
before the bounce in this scenario. It is sourced by the scale-invariant
entropy perturbation engendered by two ekpyrotic scalar fields, a mechanism
recently proposed by Lehners et al. Since the background geometry is
non-singular at all times, the curvature perturbation remains nearly constant
on super horizon scales. It emerges from the bounce unscathed and imprints a
scale-invariant spectrum of density fluctuations in the matter-radiation fluid
at the onset of the hot big bang phase. The ekpyrotic potential can be chosen
so that the spectrum has a ``red'' tilt, in accordance with the recent data
from WMAP. As in the original Ekpyrotic scenario, the model predicts a
negligible gravity wave signal on all observable scales. As such ``New
Ekpyrotic Cosmology" provides a consistent and distinguishable alternative to
inflation to account for the origin of the seeds of large scale structure.Comment: 41 pages, 4 figures. v2: minor corrections, references added. v3:
small modifications in bounce section, references added. v4: version
published in PR
Computationally driven discovery of SARS-CoV-2 M pro inhibitors: From design to experimental validation
We report a fast-track computationally driven discovery of new SARS-CoV-2 main protease (
Hydrogen-Poor Disks in Compact X-Ray Binaries
We show that accretion disks in several compact X-ray binaries with
hydrogen-depleted donors are likely subject to a thermal ionization
instability, unless they are strongly irradiated. These disks are particularly
interesting in that their MHD-turbulent properties in the neutral phase may be
quite different from those of standard, hydrogen-rich disks.Comment: 10 pages, accepted for publication in ApJ
Supersymmetric Galileons
Galileon theories are of considerable interest since they allow for stable
violations of the null energy condition. Since such violations could have
occurred during a high-energy regime in the history of our universe, we are
motivated to study supersymmetric extensions of these theories. This is carried
out in this paper, where we construct generic classes of N=1 supersymmetric
Galileon Lagrangians. They are shown to admit non-equivalent stress-energy
tensors and, hence, vacua manifesting differing conditions for violating the
null energy condition. The temporal and spatial fluctuations of all component
fields of the supermultiplet are analyzed and shown to be stable on a large
number of such backgrounds. In the process, we uncover a surprising connection
between conformal Galileon and ghost condensate theories, allowing for a deeper
understanding of both types of theories.Comment: 41 pages, v2: added a referenc
Experimental observation of fractional topological phases with photonic qudits
Geometrical and topological phases play a fundamental role in quantum theory.
Geometric phases have been proposed as a tool for implementing unitary gates
for quantum computation. A fractional topological phase has been recently
discovered for bipartite systems. The dimension of the Hilbert space determines
the topological phase of entangled qudits under local unitary operations. Here
we investigate fractional topological phases acquired by photonic entangled
qudits. Photon pairs prepared as spatial qudits are operated inside a Sagnac
interferometer and the two-photon interference pattern reveals the topological
phase as fringes shifts when local operations are performed. Dimensions and were tested, showing the expected theoretical values.Comment: 6 pages, 4 figure
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