Does a low solar cycle minimum hint at a weak upcoming cycle?

The maximum amplitude (Rm) of a solar cycle, in the term of mean sunspot numbers, is well-known to be positively correlated with the preceding minimum (Rmin). So far as the long term trend is concerned, a low level of Rmin tends to be followed by a weak Rm, and vice versa. In this paper, we found that the evidence is insufficient to infer a very weak Cycle 24 from the very low Rmin in the preceding cycle. This is concluded by analyzing the correlation in the temporal variations of parameters for two successive cycles.Comment: 5 pages, 2 figures. Accepted by RA

Hall Effect Of Amorphous Silicon Fabricated By A Low-pressure Chemical Vapour Deposition Method

Hall Effect measurements on various amorphous materials reported so far have the following common features: (i) the Hall mobility lies between 0.01 to 0.1 cm{dollar}\sp2{dollar}/V.s. at room temperature and increases slightly with the measurement temperature; (ii) the sign of Hall coefficient is anomalous. We have started an extensive research program to study the Hall effect of a-Si thin films fabricated by the LPCVD (low pressure chemical vapour deposition) method and observed, for the first time, normal Hall coefficient in some amorphous LPCVD samples with good network structured. For instance, the Hall mobility of sample CP119 (phosphorus doped) is 0.16cm{dollar}\sp2{dollar}/V.s. and Hall coefficient is negative. The structure of this sample is amorphous as confirmed by x-ray diffraction, Raman spectroscopy, transmission electron microscopy and transport properties. We believe that amorphous material with good short range order should have the normal Hall coefficient. Doping efficiency of {dollar}\mu{dollar}c-Si fabricated by LPCVD is also studied by Hall effect and SIMS measurement. Electrical compensation model works well for {dollar}\mu{dollar}c-Si

Further study of the global minimum constraint on the two-Higgs-doublet models: LHC searches for heavy Higgs bosons

The usually considered vacuum of the two-Higgs-doublet model (2HDM) could be unstable if it locates at a local but not global minimum (GM) of the scalar potential. By requiring the vacuum to be a GM, we obtain an additional constraint, namely the GM constraint, on the scalar potential. In this work, we explore the GM constraint on the $CP$-conserving general 2HDM. This constraint is found to put limits on the soft $\mathbb{Z}_2$ breaking mass parameter $m_{12}^2$ and also squeeze the heavy $CP$-even Higgs boson mass into larger values for the $m_{12}^2< 0$ case. Combined with the current global signal fits from the LHC measurements of the 125 GeV Higgs boson, we discuss the phenomenological implications for the heavy Higgs boson searches at the LHC.Comment: 19 pages, 9 figures, 2 tables; v2: Refs added, one-loop level results added, conclusion doesn't change, matches to published versio