1,240 research outputs found
Probing a polymerized black hole with the frequency shifts of photons
As is well-known, black hole plays an important role in probing the quantum
effects of gravity in the strong-field regime. In this paper, we focus on a
polymerized black hole and investigate the quantum effects on the redshift,
blueshift and gravitational redshift of photons emitted by massive particles
revolving around this black hole. With a general relativistic formalism, we
obtain two elegant and concise expressions for the mass of the black hole and
the quantum parameter in terms of few direct observables, and find that all the
frequency shifts of photons decrease with the quantum parameter. By expanding
the total frequency shift for large orbit of the emitter, low peculiar
redshift, and small azimuthal angle, we find that the leading contributions to
the frequency shift are originated from the kinematic shift and peculiar shift,
and the quantum effects make a negligible contribution. In addition, we study
the effects of the plasma on the redshift/blueshift for the first time, and
conclude that the presence of plasma results in the decrease of the
redshift/blueshift.Comment: 8 pages, 2 figures; published in Physical Review
Cross-correlations mediated by Majorana bound states
We consider the correlated parallel transport through two quantum dots which
are tunnel-coupled to the ends of a semiconductor nanowire where the Majorana
bound states (MBSs) may emerge under proper conditions. In terms of the
cross-correlation of currents, we reveal unusual behaviors originated from the
nonlocal MBSs, including such as the distinct symmetry and antisymmetry of the
spectral density in response to the dot-level modulations, and the vanished
cross correlation occurred when any of the dot-levels is in resonance with the
Majorana zero mode
Demonstrating nonlocality induced teleportation through Majorana bound states in a semiconductor nanowire
It was predicted by Tewari [Phys. Rev. Lett. {\bf 100}, 027001 (2008)] that a
teleportationlike electron transfer phenomenon is one of the novel consequences
of the existence of Majorana fermion, because of the inherently nonlocal
nature. In this work we consider a concrete realization and measurement scheme
for this interesting behavior, based on a setup consisting of a pair of quantum
dots which are tunnel-coupled to a semiconductor nanowire and are jointly
measured by two point-contact detectors. We analyze the teleportation dynamics
in the presence of measurement backaction and discuss how the teleportation
events can be identified from the current trajectories of strong response
detectors.Comment: 5 pages, 3 figure
Poly[[bis[μ2-8-ethyl-5-oxo-2-(piperazin-1-yl)-5,8-dihydropyrido[2,3-d]pyrimidine-6-carboxylato]cobalt(II)] dihydrate]
The title compound, {[Co(C14H16N5O3)2]·2H2O}n or [Co(ppa)2]·2H2O}n, where ppa denotes the 8-ethyl-5-oxo-2-(piperazin-1-yl)-5,8-dihydropyrido[2,3-d]pyrimidine-6-carboxylate anion, was synthesized under hydrothermal conditions. The CoII atom (site symmetry ) exhibits a distorted trans-CoN2O4 octahedral geometry defined by two monodentate N-bonded and two bidentate O,O′-bonded ppa anions. The extended two-dimensional structure is a square grid, which is consolidated by N—H⋯O hydrogen bonds. The disordered uncoordinated water molecules occupy cavities within the grid
Eight new species of the genera \u3cem\u3eScorpiops\u3c/em\u3e Peters, \u3cem\u3eEuscorpiops\u3c/em\u3e Vachon, and \u3cem\u3eChaerilus\u3c/em\u3e Simon (Scorpiones: Euscorpiidae, Chaerilidae) from Tibet and Yunnan, China
Eight new species belonging to the genera Scorpiops and Euscorpiops (Euscorpiidae: Scorpiopinae) and Chaerilus (Chaerilidae) are described from China. These are: Scorpiops atomatus sp. n., Scorpiops langxian sp. n., Scorpiops luridus sp. n., Scorpiops pococki sp. n., Euscorpiops vachoni sp. n., Euscorpiops shidian sp. n., Euscorpiops karschi sp. n., and Chaerilus tessellatus sp. n. New records are also reported for these three genera, and the taxa are redescribed. Descriptions and redescriptions are based mainly on the material collected in Tibet Autonomous Region and Yunnan Province. Checklists and identification keys for Chinese species of the genus Chaerilus and the subfamily Scorpiopinae are provided
4,6-Dimethyl-2-(naphthalen-1-yl)pyrimidine
The asymmetric unit of the title compound, C16H14N2, contains two independent molecules in which the dihedral angles between the pyrimidine and naphthaline rings are 38.20 (5) and 39.35 (5)°. Intermolecular C—H⋯π contacts and π–π stacking interactions [centroid–centroid distances = 3.766 (1) and 3.792 (1) Å] are present in the crystal structure
Reconstruction of relativistic modified Newtonian dynamics for various cosmological scenarios
In this paper, we present several explicit reconstructions for a novel
relativistic theory of modified Newtonian dynamics (RMOND) derived from the
background of Friedmann-Lematre-Robertson-Walker cosmological
evolution. It is shown that the Einstein-Hilbert Lagrangian with a positive
cosmological constant is the only Lagrangian capable of accurately replicating
the exact expansion history of the cold dark matter (CDM)
universe filled solely with dust-like matter and the only way to achieve this
expansion history for the RMOND theory is to introduce additional degrees of
freedom to the matter sectors. Besides, we find that the CDM-era also
can be replicated without any real matter field within the framework of the
RMOND theory and the cosmic evolution exhibited by both the power-law and
de-Sitter solutions also can be obtained
Anti-hepatitis B viral activity of Phyllanthus niruri L (Phyllanthaceae) in HepG2/C3A and SK-HEP-1 cells
Purpose: To investigate the effectiveness of an ethanol extract of Phyllanthus niruri against hepatitis B viral (HBV) infection in human HepG2/C3A cells.Methods: An ellagic acid-rich ethanol fraction was obtained from P. niruri (Euphorbiaceae) by extraction and thin-layer chromatography. The anti-HBV activity of the fraction was evaluated in vitro against HepG2/C3A cells. The physicochemical characteristics of the fraction were assessed by nuclear magnetic resonance (1H and 12C-NMR).Results: The isolated active compound showed a half-maximal inhibitory concentration (IC50) of 120 μg/mL. Ellagic acid had no effect on HBV DNA replication at the concentrations evaluated, and did not inhibit the reproduction of HBV. However, the ethanol fraction inhibited the growth of HBV-infected HepG2/C3A cells.Conclusion: The findings suggest that the ethanol fraction of P. niruri inhibits HBV, and that the active component is not ellagic acid.Keywords: Phyllanthus niruri, Anti-HBeAg, Hepatitis B viru
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