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32 papers · 1 filter
A central closure construction for certain extensions. Applications to Hopf algebra actions
Christian Lomp
Algebra extensions A < B where A is a left B-module such that the B-action extends the multiplication in A are ubiquitous. We encounter examples of such extensions in the study of…
Observations of the pulsating subdwarf B star Feige 48: Constraints on evolution and companions
M. D. Reed, S. D. Kawaler
Since pulsating subdwarf B (sdBV or EC14026) stars were first discovered (Kilkenny et al, 1997), observational efforts have tried to realize their potential for constraining the in…
Group expansions for impurities in superconductors
Yu. G. Pogorelov, V. M. Loktev
A new method is proposed for practical calculation of the effective interaction between impurity scatterers in superconductors, based on algebraic properties of related Nambu matri…
Potts model on complex networks
S. N. Dorogovtsev, A. V. Goltsev, J. F. F. Mendes
We consider the general p-state Potts model on random networks with a given degree distribution (random Bethe lattices). We find the effect of the suppression of a first order phas…
Near-IR [Fe II] emission diagnostics applied to cold disk winds in young stars
N. Pesenti, C. Dougados, S. Cabrit +3
We investigate the emissivity properties of the main near-IR transitions of the Fe+ ion in the conditions prevailing in the inner regions of jets from young stars, based on a simpl…
Time-dependent Orbifolds and String Cosmology
Lorenzo Cornalba, Miguel S. Costa
In these lectures, we review the physics of time-dependent orbifolds of string theory, with particular attention to orbifolds of three-dimensional Minkowski space. We discuss the p…