6,970 research outputs found
Long Range Forces from Two Neutrino Exchange Revisited
The exchange of two massless neutrinos gives rise to a long range force which
couples to weakly charged matter. As has been noted previously in the
literature, the potential for this force is \VN \propto G_{F}^2 / r^5 with
monopole-monople, spin-spin and more complicated interactions. Unfortunately,
this is far too small to be observed in present day experiments. We calculate
\VN explicitly in the electroweak theory, and show that under very general
assumptions forces arising from the exchange of two massless fermions can at
best yield potentials.Comment: 5 pages + 1 figure (not included), UFIFT-HEP-92-28/HUTP-92-A04
The curious case of large-N expansions on a (pseudo)sphere
We elucidate the large-N dynamics of one-dimensional sigma models with
spherical and hyperbolic target spaces and find a duality between the Lagrange
multiplier and the angular momentum. In the hyperbolic model we propose a new
class of operators based on the irreducible representations of hyperbolic
space. We also uncover unexpected zero modes which lead to the double scaling
of the 1/N expansion and explore these modes using Gelfand-Dikiy equations.Comment: 18 pages, 3 figure
Insurance Law—Physical Contact Requirement of MVAIC Law Satisfied Where Hit and Run Vehicle Pushes Another Vehicle Into Claimant
Motor Vehicle Acc. Indemnification Corp. v. Eisenberg, 18 N.Y.2d 1, 218 N.E.2d 524, 271 N.Y.S.2d 641 (1966)
A survey of secondary school science teachers' attitudes on the responsibility of scientists to society.
Thesis (M.A.)--Boston UniversityThe purpose of this study is to determine the attitudes of science teachers in secondary school on matters relating to the responsibility of scientists to society. Science teachers in grades 9-12, or 7-12 where combined high schools existed, were surveyed.
The justification for this study partially rests on the contention that the teacher's attitudes or absence of attitudes are communicated to the pupil and influence him to varying degrees. Since it was shown - in the review of literature - that much thought is being and has been given , and much controversy is raging, regarding the role of the scientist in society and his responsibilities to that society; the attitudes of the
nation's science teachers - who it is believed are influencing the future citizens very much in this respect - are of concern.
The other foundation that this justification rests on is the desire to know what these representative (see limitations) teachers think on this vital subject. Because of this alone the study is justified.[TRUNCATED
Insurance Law—Physical Contact Requirement of MVAIC Law Satisfied Where Hit and Run Vehicle Pushes Another Vehicle Into Claimant
Motor Vehicle Acc. Indemnification Corp. v. Eisenberg, 18 N.Y.2d 1, 218 N.E.2d 524, 271 N.Y.S.2d 641 (1966)
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