14,181 research outputs found
Gravitomagnetic Field and Time-Dependent Spin-Rotation Coupling
The Kerr metric of spherically symmetric gravitational field is analyzed
through the coordinate transformation from the rotating frame to fixing frame,
and consequently that the inertial force field (with the exception of the
centrifugal force field) in the rotating system is one part of its
gravitomagnetic field is verified. We investigate the spin-rotation coupling
and, by making use of Lewis-Riesenfeld invariant theory, we obtain exact
solutions of the Schr\"{o}dinger equation of a spinning particle in a
time-dependent rotating reference frame. A potential application of these exact
solutions to the investigation of Earths rotating frequency fluctuation
by means of neutron-gravity interferometry experiment is briefly discussed in
the present paper.Comment: 6 pages, 0 figures, Late
X(1576) and the Final State Interaction Effect
We study whether the broad peak X(1576) observed by BES Collaboration arises
from the final state interaction effect of decays. The
interference effect could produce an enhancement around 1540 MeV in the
spectrum with typical interference phases. However, the branching
ratio from the final state interaction effect is far less than the
experimental data.Comment: 6 pages, 4 figures. Some typos corrected, more discussion and
references adde
Testing RIAF model for Sgr A* using the size measurements
Recent radio observations by the VLBA at 7 and 3.5 mm produced the
high-resolution images of the compact radio source located at the center of our
Galaxy--Sgr A*, and detected its wavelength-dependent intrinsic sizes at the
two wavelengths. This provides us with a good chance of testing
previously-proposed theoretical models for Sgr A*. In this {\em Letter}, we
calculate the size based on the radiatively inefficient accretion flow (RIAF)
model proposed by Yuan, Quataert & Narayan (2003). We find that the predicted
sizes after taking into account the scattering of the interstellar electrons
are consistent with the observations. We further predict an image of Sgr A* at
1.3 mm which can be tested by future observations.Comment: 10 pages, 1 figure; accepted by ApJ
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