62 research outputs found
Shear viscosity of the A_1-phase of superfluid 3He
The scattering processes between the quasiparticles in spin- up superfluid
with the quasiparticles in spin-down normal fluid are added to the other
relevant scattering processes in the Boltzmann collision terms. The Boltzmann
equation has been solved exactly for temperatures just below T_c_1. The shear
viscosity component of the A_1- phase drops as C_1(1-T/T_c_1)^(1/2). The
numerical factor C_1 is in fairly good agreement with the experiments
Cooling of a Nanomechanical Resonator in the Presence of a Single Diatomic Molecule
We propose a theoretical scheme for coupling a nanomechanical resonator to a
single diatomic molecule via microwave cavity mode of a driven LC resonator. We
describe the diatomic molecule by a Morse potential and find the corresponding
equations of motion of the hybrid system by using Fokker-Planck formalism.
Analytical expressions for the effective frequency and the effective damping of
the nanomechanical resonator are obtained. We analyze the ground state cooling
of the nanomechanical resonator in presence of the diatomic molecule. The
results confirm that presence of the molecule improves the cooling process of
the mechanical resonator. Finally, the effect of molecule's parameters on the
cooling mechanism is studied.Comment: 10 pages, 8 figure
Generating quantum discord between two distant Bose-Einstein condensates with Bell-like detection
We propose a technique that enables the creation of quantum discord between
two distant nodes, each containing a cavity consist of the Bose-Einstein
condensate, by applying a non-ideal Bell-like detection on the output modes of
optical cavities. We find the covariance matrix of the system after the
non-ideal Bell-like detection, showing explicitly that one enables manipulation
of the quantum correlations, and particularly quantum discord, between remote
Bose-Einstein condensates. We also find that the non-ideal Bell-like detection
can create entanglement between distant Bose-Einstein condensates at the two
remote site
A description of a class of finite semigroups that are near to being Malcev nilpotent
In this paper we continue the investigations on the algebraic structure of a
finite semigroup that is determined by its associated upper non-nilpotent
graph . The vertices of this graph are the elements of and
two vertices are adjacent if they generate a semigroup that is not nilpotent
(in the sense of Malcev). We introduce a class of semigroups in which the
Mal'cev nilpotent property lifts through ideal chains. We call this the class
of \B\ semigroups. The definition is such that the global information that a
semigroup is not nilpotent induces local information, i.e. some two-generated
subsemigroups are not nilpotent. It turns out that a finite monoid (in
particular, a finite group) is \B\ if and only if it is nilpotent. Our main
result is a description of \B\ finite semigroups in terms of their
associated graph . In particular, has a largest nilpotent
ideal, say , and is a 0-disjoint union of its connected components
(adjoined with a zero) with at least two elements
Shear viscosity of superfluid 3He-A_1 at low temperatures
The shear viscosity tensor of the A_1-phase of superfluid 3He is calculated
at low temperatures and melting pressure, by using Boltzmann equation approach.
The two normal and superfluid components take part in elements of the shear
viscosity tensor differently. The interaction between normal and Bogoliubov
quasiparticles in the collision integrals is considered in the binary, decay
and coalescence processes. We show that the elements of the shear viscosities
, and are proportional to .
The constant of proportionality is in nearly good agreement with the
experimental results of Roobol et al.Comment: 16 pages, some typos were correcte
A new bow-shock source with bipolar morphology in the vicinity of Sgr A*
Here we present a new bowshock blue-shifted source in the close vicinity of
Sgr A* that we name X8. We use data-sets that are based on SINFONI observations
with the Very Large Telescope. We can trace the source between 2006 and 2016 in
the blue-shifted line maps and it shows not only positional similarities to X7
but also the same spectral footprint. The symmetry axis of both extended
sources points towards Sgr A* and exhibits [Fe III] emission lines that arise
due to wind-wind shocks. In particular, the source X8 has a bipolar morphology,
which makes it the closest bipolar source in the vicinity of Sgr A*. In
addition, we can trace a K-band continuum counterpart of X8. This points
towards a stellar counterpart to the line-map emission. Overall, the source X8
can be interpreted as either a Young Stellar Object or a young planetary
nebula, which makes this source unique among so-far detected main-sequence OB
stars in this region.Comment: Accepted for publication by A&A, 15 pages, 13 figure
Nuclear Activity and the Conditions of Star-formation at the Galactic Center
The Galactic Center is the closest galactic nucleus that can be studied with
unprecedented angular resolution and sensitivity. We summarize recent basic
observational results on Sagittarius A* and the conditions for star formation
in the central stellar cluster. We cover results from the radio, infrared, and
X-ray domain and include results from simulation as well. From (sub-)mm and
near-infrared variability and near-infrared polarization data we find that the
SgrA* system (supermassive black hole spin, a potential temporary accretion
disk and/or outflow) is well ordered in its geometrical orientation and in its
emission process that we assume to reflect the accretion process onto the
supermassive black hole (SMBH).Comment: 11 pages, 4 figures, 1 table; published in PoS-SISSA Proceedings of
the: Frontier Research in Astrophysics - II, 23-28 May 2016, Mondello
(Palermo), Ital
Regeneralized London free-energy for high-c T vortex lattices
Abstract The London free-energy is regeneralized by the Ginsburg-Landau free-energy density in the presence of both d and s order parameters. We have shown that the strength of the s-d coupling, , makes an important rule to determine the form of the lattice vortex. Appearance of the ratios of the coherence length to penetration depth in the higher order corrections of the free-energy density will truncate these corrections for even large values of
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