A comparison of Monte Carlo generators

A comparison of GENIE, NEUT, NUANCE, and NuWro Monte Carlo neutrino event generators is presented using a set of four observables: protons multiplicity, total visible energy, most energetic proton momentum, and $\pi^+$ two-dimensional energy vs cosine distribution.Comment: 5 pages, 12 figures, Talk given at NUINT12: Eighth International Workshop on Neutrino-Nucleus Interactions in the Few-GeV Region, October 22-27, 2012, Rio de Janeiro, Brasi

Chief Scientist Grants: a Waste of Public Money

The chief scientist program is designed to support Israeli technological projects. The level of subsidization, as revealed in JIMS' position paper, is much higher than the level used by OECD members. In fact, the Chief Scientist office distributes freely taxpayers' money without filtering and sorting the best projects. Usually, the bulk of the budget is given to large companies with extended public relations budgets. In the past 10 years, national expenditure on civilian R&D as a percent of GDP has more than doubled, from 2.2% in 1995 to 4.7% in 2008.Chief Scientist, Research and Development, R&D, Taxes, Grants

On subgroups of R. Thompson's group FF

We provide two ways to show that the R. Thompson group $F$ has maximal subgroups of infinite index which do not fix any number in the unit interval under the natural action of $F$ on $(0,1)$, thus solving a problem by D. Savchuk. The first way employs Jones' subgroup of the R. Thompson group $F$ and leads to an explicit finitely generated example. The second way employs directed 2-complexes and 2-dimensional analogs of Stallings' core graphs, and gives many implicit examples. We also show that $F$ has a decreasing sequence of finitely generated subgroups $F>H_1>H_2>...$ such that $\cap H_i=\{1\}$ and for every $i$ there exist only finitely many subgroups of $F$ containing $H_i$.Comment: 20 pages; v2: fixed some misprints, filled a gap in the proof of Theorem 4.1, added Remark 4.1 that Homeo^+(R) and many subgrioups of that group are quasi-residually finite; v3: Section 5 added, final version accepted to Transactions of the AM