16,085 research outputs found
Parental Job Loss and Children’s Health: Ten Years after the Massive Layoff of the SOEs’ Workers in China
Beginning in the mid 1990s, China sped up its urban labor market reform and drastically restructured its state-owned enterprises (SOEs), which resulted in massive layoff of the SOEs' workers and a high unemployment rate. In this paper, we investigate the impact of the parents’ job loss on the health of their children, using six waves of the China Health and Nutrition Survey covering the period from 1991 to 2006. We find that paternal job loss has a significant negative effect on children's health, whilst maternal job loss has no significant effect. The rationale behind the findings is that the income loss resulting from maternal job loss is much smaller; at the same time, the unemployed mothers are likely to increase the time they devote to care of their children, and this may alleviate the negative effect resulting from maternal job loss. Our findings are robust to various specifications.children’s health, job loss, Grossman’s model, China
A flexible and adaptive Simpler GMRES with deflated restarting for shifted linear systems
In this paper, two efficient iterative algorithms based on the simpler GMRES
method are proposed for solving shifted linear systems. To make full use of the
shifted structure, the proposed algorithms utilizing the deflated restarting
strategy and flexible preconditioning can significantly reduce the number of
matrix-vector products and the elapsed CPU time. Numerical experiments are
reported to illustrate the performance and effectiveness of the proposed
algorithms.Comment: 17 pages. 9 Tables, 1 figure; Newly update: add some new numerical
results and correct some typos and syntax error
Asymptotically Safe Higgs Inflation
We construct a new inflation model in which the standard model Higgs boson
couples minimally to gravity and acts as the inflaton. Our construction of
Higgs inflation incorporates the standard model with Einstein gravity which
exhibits asymptotic safety in the ultraviolet region. The slow roll condition
is satisfied at large field value due to the asymptotically safe behavior of
Higgs self-coupling at high energies. We find that this minimal construction is
highly predictive, and is consistent with both cosmological observations and
collider experiments.Comment: 16pp, to match JCAP Final Version, only minor refinements, references
adde
Extending Higgs Inflation with TeV Scale New Physics
Higgs inflation is among the most economical and predictive inflation models,
although the original Higgs inflation requires tuning the Higgs or top mass
away from its current experimental value by more than deviations, and
generally gives a negligible tensor-to-scalar ratio (if away
from the vicinity of critical point). In this work, we construct a minimal
extension of Higgs inflation, by adding only two new weak-singlet particles at
TeV scale, a vector-quark and a real scalar . The presence of singlets
significantly impact the renormalization group running of the Higgs
boson self-coupling. With this, our model provides a wider range of the
tensor-to-scalar ratio , consistent with the favored
values by either BICEP2 or Planck data, while keeping the successful prediction
of the spectral index . It further allows the Higgs and top
masses to fully fit the collider measurements. We also discuss implications for
searching the predicted TeV-scale vector-quark and scalar at the LHC
and future high energy pp colliders.Comment: 20pp, to match JCAP Final Versio
Spontaneous Spacetime Reduction and Unitary Weak Boson Scattering at the LHC
Theories of quantum gravity predict spacetime dimensions to become reduced at
high energies, a striking phenomenon known as spontaneous dimensional reduction
(SDR). We construct an effective electroweak theory based on the standard model
(SM) and incorporate the TeV-scale SDR, which exhibits good high energy
behavior and ensures the unitarity of weak gauge boson scattering. This also
provides a natural solution to the hierarchy problem in the presence of scalar
Higgs boson. We demonstrate that this model predicts unitary longitudinal weak
boson scattering, and can be discriminated from the conventional 4d SM by the
WW scattering experiments at the CERN LHC.Comment: Phys. Lett. B (in Press). arXiv admin note: text overlap with
arXiv:1112.102
Topological phase in topological Kondo insulator: topological insulator, Haldane-like phase and Kondo breakdown
We have simulated a half-filled -wave periodic Anderson model with
numerically exact projector quantum Monte Carlo technique, and the system is
indeed located in the Haldane-like state as detected in previous works on the
-wave Kondo lattice model, though the soluble non-interacting limit
corresponds to the conventional topological insulator. The
site-resolved magnetization in an open boundary system and strange correlator
for the periodic boundary have been used to identify the mentioned topological
states. Interestingly, the edge magnetization in the Haldane-like state is not
saturated to unit magnetic moment due to the intrinsic charge fluctuation in
our periodic Anderson-like model, which is beyond the description of the Kondo
lattice-like model in existing literature. The finding here underlies the
correlation driven topological state in this prototypical interacting
topological state of matter and naive use of non-interacting picture should be
taken care. Moreover, no trace of the surface Kondo breakdown at zero
temperature is observed and it is suspected that frustration-like interaction
may be crucial in inducing such radical destruction of Kondo screening. The
findings here may be relevant to our understanding of interacting topological
materials like topological Kondo insulator candidate SmB.Comment: 11 pages, 9 figures, accepted by EPJ
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