861 research outputs found
A Generalization of Moufang and Steiner Loops
We study a variety of loops, RIF, which arise naturally from considering
inner mapping groups, and a somewhat larger variety, ARIF. All Steiner and
Moufang loops are RIF, and all flexible C-loops are ARIF. We show that all ARIF
loops are diassociative, thus generalizing Moufang's Theorem.Comment: 19 pp., 1 fig., uses amsart.cls, pifont.sty; to appear in Algebra
Universali
Halo effective field theory constrains the solar Beryllium-7 + proton -> Boron-8 + photon rate
We report an improved low-energy extrapolation of the cross section for the
process Beryllium-7+proton -> Boron-8+photon, which determines the Boron-8
neutrino flux from the Sun. Our extrapolant is derived from Halo Effective
Field Theory (EFT) at next-to-leading order. We apply Bayesian methods to
determine the EFT parameters and the low-energy S-factor, using measured cross
sections and scattering lengths as inputs. Asymptotic normalization
coefficients of Boron-8 are tightly constrained by existing radiative capture
data, and contributions to the cross section beyond external direct capture are
detected in the data at E < 0.5 MeV. Most importantly, the S-factor at zero
energy is constrained to be S(0)= 21.3 + - 0.7 eV b, which is an uncertainty
smaller by a factor of two than previously recommended. That recommendation was
based on the full range for S(0) obtained among a discrete set of models judged
to be reasonable. In contrast, Halo EFT subsumes all models into a controlled
low-energy approximant, where they are characterized by nine parameters at
next-to-leading order. These are fit to data, and marginalized over via Monte
Carlo integration to produce the improved prediction for S(E).Comment: 7 pages, 3 figures, 2 tables, and 1 supplemental materia
Spiritual Well-Being, Sleep Disturbance and Mental and Physical Health Status in HIV-infected Individuals
Social Support, Coping, and Medication Adherence Among HIV-Positive Women with Depression Living in Rural Areas of the Southeastern United States
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