5.4k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Universidade do PortoPT1k papers
- Centre National de la Recherche ScientifiqueFR606 papers
- Institute of Astrophysics and Space SciencesPT606 papers
- University of GenevaCH406 papers
- Instituto de Astrofísica de CanariasES387 papers
- Institut d'Astrophysique de ParisFR334 papers
- Universidad de La LagunaES330 papers
- National Institute for AstrophysicsIT296 papers
- University of CambridgeGB267 papers
- European Southern ObservatoryCL260 papers
- Aix-Marseille UniversitéFR232 papers
- Osservatorio Astronomico di PadovaIT225 papers
11 papers · 2 filters
Topological Defects in Contracting Universes
P. P. Avelino, C. J. A. P. Martins, C. Santos +1
We study the behaviour and consequences of cosmic string networks in contracting universes. They approximately behave during the collapse phase as a radiation fluids. Scaling solut…
The power spectrum amplitude from clusters revisited: σ_8 using simulations with preheating and cooling
Pedro T P Viana, Scott T Kay, Andrew R Liddle +2
The amplitude of density perturbations, for the currently-favoured LambdaCDM cosmology, is constrained using the observed properties of galaxy clusters. The catalogue used is that…
Simultaneous Optical and X-ray Observations of Flares and Rotational Modulation on the RS CVn Binary HR 1099 (V711 Tau) from the MUSICOS 1998 Campaign
D. Garcia-Alvarez, B. H. Foing, D. Montes +2
We present simultaneous and continuous observations of the H, H, He {\sc i} D, Na {\sc i} D,D doublet and the Ca {\sc ii} H & K lines for the RS CVn system…
Detection of Solar-like Oscillations in the G7 Giant Star xi Hya
S. Frandsen, F. Carrier, C. Aerts +9
We report the firm discovery of solar-like oscillations in a giant star. We monitored the star xi Hya (G7III) continuously during one month with the CORALIE spectrograph attached t…
Cosmic Numbers: A Physical Classification for Cosmological Models
P. P. Avelino, C. J. A. P. Martins
We introduce the notion of the cosmic numbers of a cosmological model, and discuss how they can be used to naturally classify models according to their ability to solve some of the…
Alternatives to Quintessence Model Building
P. P. Avelino, L. M. G. Beca, J. P. M. de Carvalho +2
We discuss the issue of toy model building for the dark energy component of the universe. Specifically, we consider two generic toy models recently proposed as alternatives to quin…
The galaxy luminosity function in the cluster of galaxies Abell 496
Florence Durret, Christophe Adami, Catarina Lobo
We have derived the galaxy luminosity function (GLF) in the cluster of galaxies Abell 496 from a wide field image in the I band. A single Schechter function reproduces quite well t…
Topological defects: A problem for cyclic universes?
P. P. Avelino, C. J. A. P. Martins, C. Santos +1
We study the behaviour of cosmic string networks in contracting universes, and discuss some of their possible consequences. We note that there is a fundamental time asymmetry betwe…
Cosmology with Varying Constants
C. J. A. P. Martins
The idea of possible time or space variations of the `fundamental' constants of nature, although not new, is only now beginning to be actively considered by large numbers of resear…
Topology of the universe from COBE-DMR; a wavelet approach
G. Rocha, L. Cayon, R. Bowen +4
In this paper we pursue a new technique to search for evidence of a finite Universe, making use of a spherical mexican-hat wavelet decomposition of the microwave background fluctua…
Measuring in the Early Universe: CMB Temperature, Large-Scale Structure and Fisher Matrix Analysis
C. J. A. P. Martins, A. Melchiorri, R. Trotta +4
We extend our recent work on the effects of a time-varying fine-structure constant in the cosmic microwave background, by providing a thorough analysis of the degeneracies betw…