856 citations
- University of CopenhagenDK6 papers
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14 papers · 1 filter
An alternative approach to homotopy operations
Marcel Bokstedt, Iver Ottosen
We give a particular choice of the higher Eilenberg-MacLane maps by a recursive formula.This choice leads to a simple description of the homotopy operations for simplicial Z/2-alge…
A spectral sequence for string cohomology
Marcel Bokstedt, Iver Ottosen
Let X be a 1-connected space with free loop space LX. We introduce two spectral sequences converging towards H^*(LX;Z/p) and H^*((LX)_hT;Z/p). The E2-terms are certain non Abelian…
Strangelet propagation and cosmic ray flux
Jes Madsen
The galactic propagation of cosmic ray strangelets is described and the resulting flux is calculated for a wide range of parameters as a prerequisite for strangelet searches in lun…
Experimental demonstration of quantum memory for light
Brian Julsgaard, Jacob Sherson, J. Ignacio Cirac +2
The information carrier of today's communications, a weak pulse of light, is an intrinsically quantum object. As a consequence, complete information about the pulse cannot, even in…
The Lyman-alpha glow of gas falling into the dark matter halo of a z=3 galaxy
Michael Weidinger, Palle Moller, Johan P. U. Fynbo
Quasars are the visible signatures of super-massive black holes in the centres of distant galaxies. It has been suggested that quasars are formed during ``major merger events'' whe…
F-regularity of large Schubert varieties
Michel Brion, Jesper Funch Thomsen
Let G denote a connected reductive algebraic group over an algebraically closed field k and let X denote a projective G x G-equivariant embedding of G. The large Schubert varieties…