2,681 research outputs found
RW Aur A from the X-Wind Point of View: General Features
In this paper, the RW Aur A microjet is studied from the point of view of
X-wind models. The archived HST/STIS spectra of optical forbidden lines [O I],
[S II], and [N II] from RW Aur A, taken in Cycle 8 with seven parallel slits
along the jet axis, spaced at 0".07 apart, were analyzed. Images,
position-velocity diagrams, and line ratios among the species were constructed,
and compared with synthetic observations generated by selected solutions of the
X-wind. Prominent features arising in a steady state X-wind could be identified
within the convolved images, full-widths at half maxima and high-velocity peaks
on both of the redshifted and blueshifted jets. The well-known asymmetric
velocity profiles of the opposite jets are built into the selected models. We
discuss model selections within the existing uncertainties of stellar
parameters and inclination angle of the system. In this framework, the
mass-loss rates that were inferred to be decreasing along the jet axis in the
literature are the results of slowly decreasing excitation conditions and
electron density profiles. Despite the apparent asymmetry in terminal
velocities, line intensities and mass-loss rates, the average linear momenta
from the opposite sides of the jet are actually balanced. These previously
hard-to-explain features of the asymmetric RW Aur A jet system now find a
different but self-consistent interpretation within the X-wind framework.Comment: 31 pages, 9 figures, 5 tables; accepted for publication in ApJ (Send
correspondence to: [email protected]
CP Violation and Extra Dimensions
It is shown that the new sources of CP violation can be generated in the
models with more than one extra dimensions. In the supersymmetric models on the
space-time , where the radius moduli have auxiliary vacuum
expectation values and the supersymmetry breaking is mediated by the
Kaluza-Klein states of gauge supermultiplets, we analyze the gaugino masses and
trilinear couplings for two scenarios and obtain that there exist relative CP
violating phases among the gaugino masses and trilinear couplings.Comment: Latex, 7 page
Transport of First Rocks of The Solar System by X-winds
It has been suggested that chondrules and calcium-aluminum-rich inclusions
(CAIs) were formed at the inner edge of the protoplanetary disk and then
entrained in magnetocentrifugal X-winds. We study trajectories of such solid
bodies with the consideration of the central star gravity, the protoplanetary
disk gravity, and the gas drag of the wind. The efficiency of the gas drag
depends on a parameter , which is the product of the solid body size and
density. We find that the gravity of the protoplanetary disk has a
non-negligible effect on the trajectories. If a solid body re-enters the flared
disk, the re-entering radius depends on the stellar magnetic dipole moment, the
disk's gravity, the parameter , and the initial launching angle. The
disk's gravity can make the re-entering radius lower by up to 30%. We find a
threshold , denoted as , for any particular configuration of the
X-wind, below which the solid bodies will be expelled from the planetary
system. sensitively depends on the initial launching angle, and also
depends on the mass of the disk. Only the solid bodies with a larger
than but very close to can be launched to a re-entering radius larger
than 1 AU. This size-sorting effect may explain why chondrules come with a
narrow range of sizes within each chondritic class. In general, the size
distributions of CAIs and chondrules in chondrites can be determined from the
initial size distribution as well as the distribution over the initial
launching angle.Comment: Accepted for publication in Ap
Rare decay in a CP spontaneously broken two Higgs doublet model
The Higgs boson mass spectrum and couplings of neutral Higgs bosons to
fermions are worked out i n a CP spontaneously broken two Higgs doublet model
in the large tan case.
The differential branching ratio, forward-backward asymmetry, CP asymmetry
and lepton polarization for are computed. It is shown that
effects of neutral Higgs bosons are quite significant when is
large. Especially, the CP violating normal polarization can be as large
as several percents.Comment: 27 pages, text updated, new numerical results include
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