1,727 research outputs found
No evidence for the evolution of mass density power-law index from strong gravitational lensing observation
In this paper, we consider the singular isothermal sphere lensing model that
has a spherically symmetric power-law mass distribution . We investigate whether the mass density power-law index
is cosmologically evolutionary by using the strong gravitational lensing (SGL)
observation, in combination with other cosmological observations. We also check
whether the constraint result of is affected by the cosmological
model, by considering several simple dynamical dark energy models. We find that
the constraint on is mainly decided by the SGL observation and
independent of the cosmological model, and we find no evidence for the
evolution of from the SGL observation.Comment: 7 pages, 3 figure
Top quark decays with flavor violation in the B-LSSM
The decays of top quark are extremely rare processes in the
standard model (SM). The predictions on the corresponding branching ratios in
the SM are too small to be detected in the future, hence any measurable signal
for the processes at the LHC is a smoking gun for new physics. In the extension
of minimal supersymmetric standard model with an additional local
gauge symmetry (B-LSSM), new gauge interaction and new flavor changing
interaction affect the theoretical evaluations on corresponding branching
ratios of those processes. In this work, we analyze those processes in the
B-LSSM, under a minimal flavor violating assumption for the soft breaking
terms. Considering the constraints from updated experimental data, the
numerical results imply ,
, and in our
chosen parameter space. Simultaneously, new gauge coupling constants
in the B-LSSM can also affect the numerical results of
.Comment: 20 pages, 4 figures, published in EPJC. arXiv admin note: substantial
text overlap with arXiv:1803.0990
Domain Gap Estimation for Source Free Unsupervised Domain Adaptation with Many Classifiers
In theory, the success of unsupervised domain adaptation (UDA) largely relies
on domain gap estimation. However, for source free UDA, the source domain data
can not be accessed during adaptation, which poses great challenge of measuring
the domain gap. In this paper, we propose to use many classifiers to learn the
source domain decision boundaries, which provides a tighter upper bound of the
domain gap, even if both of the domain data can not be simultaneously accessed.
The source model is trained to push away each pair of classifiers whilst
ensuring the correctness of the decision boundaries. In this sense, our many
classifiers model separates the source different categories as far as possible
which induces the maximum disagreement of many classifiers in the target
domain, thus the transferable source domain knowledge is maximized. For
adaptation, the source model is adapted to maximize the agreement among pairs
of the classifiers. Thus the target features are pushed away from the decision
boundaries. Experiments on several datasets of UDA show that our approach
achieves state of the art performance among source free UDA approaches and can
even compete to source available UDA methods.Comment: 31 page
Electroweak baryogenesis and electron EDM in the B-LSSM
Electroweak baryogenesis (EWB) and electric dipole moment (EDM) have close
relation with the new physics beyond the standard model (SM), because the SM
CP-violating (CPV) interactions are not sufficient to provide the baryon
asymmetry of the universe by many orders of magnitude, and the theoretical
predictions for the EDM of electron () in the SM are too tiny to be
detected in near future. In this work, we explore the CPV effects on EWB and
the electron EDM in the minimal supersymmetric extension (MSSM) of the SM with
local gauge symmetry (B-LSSM). And the two-step transition via
tree-effects in this model is discussed. Including two-loop corrections to
and considering the constrains from updated experimental data, the
numerical results show that the B-LSSM can account for the observed baryon
asymmetry. In addition, when the cancellation between different contributions
to takes place, the region favored by EWB can be compatible with the
corresponding EDM bound.Comment: 20 pages,7 figures. arXiv admin note: text overlap with
arXiv:1910.0586
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