3,919 research outputs found
Probing Gravitational Dark Matter
So far all evidences of dark matter (DM) come from astrophysical and
cosmological observations, due to gravitational interactions of the DM. It is
possible that the true DM particle in the universe joins gravitational
interactions only, but nothing else. Such a Gravitational DM (GDM) acts as a
weakly interacting massive particle (WIMP), which is conceptually simple and
attractive. In this work, we explore this direction by constructing the
simplest scalar GDM particle . It is a odd singlet under the
standard model (SM) gauge group, and naturally joins the unique dimension-4
interaction with Ricci curvature, , where is the
dimensionless nonminimal coupling. We demonstrate that this gravitational
interaction , together with Higgs-curvature nonminimal
coupling term , induces effective couplings between
and SM fields which can account for the observed DM thermal relic
abundance. We analyze the annihilation cross sections of GDM particles and
derive the viable parameter space for realizing the DM thermal relic density.
We further study the direct/indirect detections and the collider signatures of
such a scalar GDM. These turn out to be highly predictive and testable.Comment: 33pp, JCAP Final Version. Only minor rewordings, references adde
Higgs Gravitational Interaction, Weak Boson Scattering, and Higgs Inflation in Jordan and Einstein Frames
We study gravitational interaction of Higgs boson through the unique
dimension-4 operator , with the Higgs doublet and the
Ricci scalar curvature. We analyze the effect of this dimensionless nonminimal
coupling on weak gauge boson scattering in both Jordan and Einstein
frames. We explicitly establish the longitudinal-Goldstone boson equivalence
theorem with nonzero coupling in both frames, and analyze the unitarity
constraints. We study the -induced weak boson scattering cross sections at
O(1-30)TeV scales, and propose to probe the Higgs-gravity coupling via weak
boson scattering experiments at the LHC(14TeV) and the next generation pp
colliders (50-100TeV). We further extend our study to Higgs inflation, and
quantitatively derive the perturbative unitarity bounds via coupled channel
analysis, under large field background at the inflation scale. We analyze the
unitarity constraints on the parameter space in both the conventional Higgs
inflation and the improved models in light of the recent BICEP2 data.Comment: 40pp, JCAP Final Version. Use jcappub.sty, only minor rewordings,
references adde
Gravitational Interaction of Higgs Boson and Weak Boson Scattering
With the LHC discovery of a 125 GeV Higgs-like boson, we study gravitational
interaction of the Higgs boson via the unique dimension-4 operator involving
Higgs doublet and scalar curvature, , with nonminimal
coupling . This Higgs portal term can be transformed away in Einstein
frame and induces gauge-invariant effective interactions in the Higgs sector.
We study the weak boson scattering in Einstein frame, and explicitly
demonstrate the longitudinal-Goldstone boson equivalence theorem in the
presence of coupling. With these, we derive unitarity bound on the
Higgs gravitational coupling in Einstein frame, which is stronger
than that inferred from the current LHC Higgs measurements. We further study
-dependent weak boson scattering cross sections at TeV scale, and propose
a new LHC probe of the Higgs-gravity coupling via weak boson
scattering experiments.Comment: 7pp, Phys.Rev.D Published Version. All results + conclusions
un-changed. Only minor rewording to clarify the Importance of this wor
LHC Search of New Higgs Boson via Resonant Di-Higgs Production with Decays into 4W
Searching for new Higgs particle beyond the observed light Higgs boson
h(125GeV) will unambiguously point to new physics beyond the standard model. We
study the resonant production of a CP-even heavy Higgs state in the
di-Higgs channel via, , at the LHC Run-2 and
the high luminosity LHC (HL-LHC). We analyze two types of the decay modes,
one with the same-sign di-leptons () and the
other with tri-leptons (). We
perform a full simulation for the signals and backgrounds, and estimate the
discovery potential of the heavy Higgs state at the LHC Run-2 and the HL-LHC,
in the context of generical two-Higgs-doublet models (2HDM). We determine the
viable parameter space of the 2HDM as allowed by the theoretical constraints
and the current experimental limits. We systematically analyze the allowed
parameter space of the 2HDM which can be effectively probed by the heavy Higgs
searches of the LHC, and further compare this with the viable parameter region
under the current theoretical and experimental bounds.Comment: v3: JHEP published version, 34pp, 10 Figs(36 plots) and 9 Tables.
Only minor typos fixed, references added. v2: JHEP version. All results and
conclusions un-changed, discussions and references added. (This update is
much delayed due to author's traveling and flu.
The effect of large scale photovoltaic-based projects on poverty reduction: Empirical evidence from China
As a high-quality clean energy, exploring the benefits of solar photovoltaic (PV) projects on regional economy and sustainable development will challenge its development at the policy and planning levels, which also involves two key goals in the Sustainable Development Goals (SDGs) proposed by the United Nations: poverty reduction and clean energy provision. To address this problem, we take China's Photovoltaic Poverty Alleviation Project (PPAP) as an example to empirically study the benefits of large-scale PV deployment for alleviating poverty in its multiple dimensions and achieving regional sustainable development. We investigated its effect using a panel dataset of 71 pilot counties supported by PPAP in China from 2014 to 2017, with propensity score matching and difference-in-difference estimation as the main modeling tools. We found that PPAP can reduce multidimensional poverty on average by 3.0% in a county, benefiting sustainable livelihoods. In detail regarding multidimensional poverty alleviation, PPAP can effectively reduce the poverty level of economic capital, social capital, and human capital. However, it has a limited impact on physical and natural capital. Besides, state-designated poverty counties benefit more from PPAP than the non-poverty counties. Geographically, the poverty reduction effect of PPAP also shows strong regional heterogeneity, with the most substantial poverty alleviation effect in Northwest China. Our research will enhance the public's understanding of PPAP, promote the realization of Goal 1 on poverty reduction and Goal 7 on affordable and clean energy in SDGs, and provide a reference for policymakers for future decision-making, as well as for large-scale PV project deployment in other developing countries
What do we know about multidimensional poverty in China: its dynamics, causes, and implications for sustainability
Poverty is a primary obstacle to achieving sustainable development. Therefore, exploring the spatiotemporal dynamics and causes of poverty is of great significance to the sustainable poverty reduction of the “post poverty alleviation era” in China. This paper used the multisource big data of 2022 counties in China from 2000 to 2015 to establish a comprehensive evaluation framework to explore the multidimensional poverty situation in China. The results showed the following findings: There is an obvious spatiotemporal heterogeneity of multidimensional poverty, showing a typical stair-like gradient from high in the west to low in the east, with the poverty level in state-designated poverty counties higher and intensifying over time. The spatial differentiation of multidimensional poverty is contributed to by multiple factors, in which the geographical condition has a stronger impact on state-designated poverty counties, while natural endowment and human resources have a stronger effect on non-state-designated poverty counties. These things considered, the regional poverty causes were relatively stable before 2015, but the poverty spatial agglomeration of some regions in the Northwest, Northeast, and Yangtze River Economic Belt has undergone significant changes after 2015. These findings can help policymakers better target plans to eliminate various types of poverty in different regions
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