2,644 research outputs found
Discovery of parity-violating Majorana fermions in a chiral superconductor Sr2RuO4
We found parity-violating Majorana fermions in a chiral superconductor
Sr2RuO4. The current-voltage curves show an anomalous behavior: The induced
voltage is an even function of the bias current. The magnetic field dependent
results suggest the excitation of the Majorana fermions along the closed chiral
edge current of the single domain under bias current. We also discuss the
relationship between a change of the chirality and spontaneous magnetization of
the single domain Sr2RuO4
Global well-posedness of the Kirchhoff equation and Kirchhoff systems
This article is devoted to review the known results on global well-posedness
for the Cauchy problem to the Kirchhoff equation and Kirchhoff systems with
small data. Similar results will be obtained for the initial-boundary value
problems in exterior domains with compact boundary. Also, the known results on
large data problems will be reviewed together with open problems.Comment: arXiv admin note: text overlap with arXiv:1211.300
A feasibility study for advanced technology integration for general aviation
An investigation was conducted to identify candidate technologies and specific developments which offer greatest promise for improving safety, fuel efficiency, performance, and utility of general aviation airplanes. Interviews were conducted with general aviation airframe and systems manufacturers and NASA research centers. The following technologies were evaluated for use in airplane design tradeoff studies conducted during the study: avionics, aerodynamics, configurations, structures, flight controls, and propulsion. Based on industry interviews and design tradeoff studies, several recommendations were made for further high payoff research. The most attractive technologies for use by the general aviation industry appear to be advanced engines, composite materials, natural laminar flow airfoils, and advanced integrated avionics systems. The integration of these technologies in airplane design can yield significant increases in speeds, ranges, and payloads over present aircraft with 40 percent to 50 percent reductions in fuel used
The thermal-orbital evolution of the Earth-Moon system with a subsurface magma ocean and fossil figure
Various theories have been proposed to explain the Moon's current inclined
orbit. We test the viability of these theories by reconstructing the
thermal-orbital history of the Moon. We build on past thermal-orbital models
and incorporate the evolution of the lunar figure including a fossil figure
component. Obliquity tidal heating in the lunar magma ocean would have produced
rapid inclination damping, making it difficult for an early inclination to
survive to the present-day. An early inclination is preserved only if the
solid-body of the early Moon were less dissipative than at present. If
instabilities at the Laplace plane transition were the source of the
inclination, then the Moon had to recede slowly, which is consistent with
previous findings of a weakly dissipative early Earth. If collisionless
encounters with planetesimals up to 140 Myr after Moon formation excited the
inclination, then the Moon had to migrate quickly to pass through the Cassini
state transition at 33 Earth radii and reach a period of limited inclination
damping. The fossil figure was likely established before 16 Earth radii to
match the present-day degree-2 gravity field observations.Comment: 18 pages, 6 figure
On the induced gauge invariant mass
We derive a general expression for the gauge invariant mass (m_G) for an
Abelian gauge field, as induced by vacuum polarization, in 1+1 dimensions. From
its relation to the chiral anomaly, we show that m_G has to satisfy a certain
quantization condition. This quantization can be, on the other hand, explicitly
verified by using the exact general expression for the gauge invariant mass in
terms of the fermion propagator. This result is applied to some explicit
examples, exploring the possibility of having interesting physical situations
where the value of departs from its canonical value. We also study the
possibility of generalizing the results to the 2+1 dimensional case at finite
temperature, showing that there are indeed situations where a finite and
non-vanishing gauge invariant mass is induced.Comment: 18 pages, Latex, 3 figures (pstex
Indications for grain growth and mass decrease in cold dust disks around Classical T Tauri stars in the MBM 12 young association
We report detection of continuum emission at 850 and 450 micron from disks
around four Classical T Tauri stars in the MBM 12 (L1457) young association.
Using a simple model we infer masses of 0.0014-0.012 M_sun for the disk of LkHa
263 ABC, 0.005-0.021 M_sun for S18 ABab, 0.03-0.18 M_sun for LkHa 264 A, and
0.023-0.23 M_sun for LkHa 262. The disk mass found for LkHa 263 ABC is
consistent with the 0.0018 M_sun inferred from the scattered light image of the
edge-on disk around component C. Comparison to earlier 13CO line observations
indicates CO depletion by up to a factor 300 with respect to dark-cloud values.
The spectral energy distributions (SED) suggest grain growth, possibly to sizes
of a few hundred micron, but our spatially unresolved data cannot rule out
opacity as an explanation for the SED shape. Our observations show that these T
Tauri stars are still surrounded by significant reservoirs of cold material at
an age of 1-5 Myr. We conclude that the observed differences in disk mass are
likely explained by binary separation affecting the initial value. With
available accretion rate estimates we find that our data are consistent with
theoretical expectations for viscously evolving disks having decreased their
masses by ~30%.Comment: 15 pages, 3 figures, uses aastex. ApJ Letters, in pres
Anyons as quon particles
The momentum operator representation of nonrelativistic anyons is developed
in the Chern - Simons formulation of fractional statistics. The connection
between anyons and the q-deformed bosonic algebra is established.Comment: 10 pages,Late
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