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29 papers · 1 filter
Pseudofractal Scale-free Web
S. N. Dorogovtsev, A. V. Goltsev, J. F. F. Mendes
We find that scale-free random networks are excellently modeled by a deterministic graph. This graph has a discrete degree distribution (degree is the number of connections of a ve…
Discover of the "missing" mode in HR 1217 by the Whole Earth Telescope
D. W. Kurtz, S. D. Kawaler, R. L. Riddle et al.
HR 1217 is a prototypical rapidly oscillating Ap star that has presented a test to the theory of nonradial stellar pulsation. Prior observations showed a clear pattern of five mode…
On the uniform hyperbolicity of some nonuniformly hyperbolic systems
Jose F. Alves, Vitor Araujo, Benoit Saussol
We give sufficient conditions for the uniform hyperbolicity of certain nonuniformly hyperbolic dynamical systems. In particular, we show that local diffeomorphisms that are nonunif…
The symplectic vortex equations and invariants of Hamiltonian group actions
Kai Cieliebak, A. Rita Gaio, Ignasi Mundet i Riera +1
In this paper we define invariants of Hamiltonian group actions for central regular values of the moment map. The key hypotheses are that the moment map is proper and that the ambi…
Constraining the Matter Power Spectrum Normalization using the SDSS/RASS and REFLEX Cluster surveys
Pedro T. P. Viana, Robert C. Nichol, Andrew R. Liddle
We describe a new approach to constrain the amplitude of the power spectrum of matter perturbations in the Universe, parametrized by sigma_8 as a function of the matter density Ome…
Modified Median Statistics and Type Ia Supernova Data
P. P. Avelino, C. J. A. P. Martins, P. Pinto
The median statistic has recently been discussed by Gott \textit{et al.} as a more reliable alternative to the standard likelihood analysis, in the sense of requiring fewer a…