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70 papers · 1 filter
H.E.S.S. constraints on Dark Matter annihilations towards the Sculptor and Carina Dwarf Galaxies
HESS Collaboration, A. Abramowski, F. Acero +192
The Sculptor and Carina Dwarf spheroidal galaxies were observed with the H.E.S.S. Cherenkov telescope array between January 2008 and December 2009. The data sets consist of a total…
Phase diagram of one-dimensional earth-alkaline cold fermionic atoms
Heloise Nonne, Edouard Boulat, Sylvain Capponi +1
The phase diagram of one-dimensional earth-alkaline fermionic atoms and ytterbium 171 atoms is investigated by means of a low-energy approach and density-matrix renormalization gro…
Categories of partial algebras for critical points between varieties of algebras
Pierre Gillibert
A lifting of a semilattice S is an algebra A such that the semilattice of compact (=finitely generated) congruences of A is isomorphic to S. The aim of this work is to give a categ…
A tale of two GRB-SNe at a common redshift of z = 0.54
Z. Cano, D. Bersier, C. Guidorzi +71
We present ground-based and HST optical observations of the optical transients (OTs) of long-duration Gamma Ray Bursts (GRBs) 060729 and 090618, both at a redshift of z = 0.54. For…
Validating XML Documents in the Streaming Model with External Memory
Christian Konrad, Frederic Magniez
We study the problem of validating XML documents of size against general DTDs in the context of streaming algorithms. The starting point of this work is a well-known space lowe…
Unique perfect phylogeny is NP-hard
Michel Habib, Juraj Stacho
We answer, in the affirmative, the following question proposed by Mike Steel as a $100 challenge: "Is the following problem NP-hard? Given a ternary phylogenetic X-tree T and a col…