5,390 research outputs found
Spectropolarimetry with the DAO 1.8-m telescope
The fast-switching DAO spectropolarimeter mounted on the 1.8-m Plaskett
telescope started operation in 2007. Almost 14,000 medium-resolution (R=15,000)
polarimetric spectra of 65 O - F type stars have been obtained since then in
the course of three ongoing projects: the DAO Magnetic Field Survey, supporting
observations for the CFHT MiMeS survey, and an investigation of the systematic
differences between the observed longitudinal field measured with the Hbeta
line and metallic lines. The projects are briefly described here. The current
status as well as some results are presented.Comment: "Magnetic Stars", Proceedings of the International Conference, Nizhny
Arkhyz, 27 August - 1 September 201
Comedy, pain and nonsense at the Red Moon Cafe: The Little Tramp's death by service work in Modern Times
Paper presented at the Art of Management Conference, 2004, ParisThis paper was originally presented at the Art of Management Conference, in Paris in 2004. The paper is an essay about The Red Moon Cafe scene in Charlie Chaplin's masterpeiece, Modern Times (1936). In this scene, famous for the Nonsense Song, where the Little Tramp 'speaks' for the first and the last time on screen, Chaplin explores service work, especially the theme of authenticity, and uses his skills as a dancer, musician, choreographer, and film maker, to provide a commentary on service work
Degeneracy between Abelian and Non-Abelian Strings
In a model that supports both Abelian (Abrikosov-Nielsen-Olesen) and
non-Abelian strings we analyze the parameter space to find examples in which
these strings not only coexist but are degenerate in tension. We prove that
both solutions are locally stable, i.e there are no negative modes in the
string background. The tension degeneracy is achieved at the classical level
and is expected to be lifted by quantum corrections. The set up of the model,
analogous to that of Witten's superconducting cosmic strings, had been extended
to include non-Abelian strings
The weakness of the pigeonhole principle under hyperarithmetical reductions
The infinite pigeonhole principle for 2-partitions ()
asserts the existence, for every set , of an infinite subset of or of
its complement. In this paper, we study the infinite pigeonhole principle from
a computability-theoretic viewpoint. We prove in particular that
admits strong cone avoidance for arithmetical and
hyperarithmetical reductions. We also prove the existence, for every
set, of an infinite low subset of it or its complement. This
answers a question of Wang. For this, we design a new notion of forcing which
generalizes the first and second-jump control of Cholak, Jockusch and Slaman.Comment: 29 page
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