Abstract
(Französisch)
|
A1. Scientific Highlights
We have shown in a Geneva/Paris publication that parameter estimation from CMB anisotropies is severely hampered if contributions from isocurvature modes are admitted. This result has now been published as a Phys. Rev. Letter (first ref. below) and has been discussed at several conferences and seminars.
Together with A. Riazuelo and D. Steer from Paris, members of the Geneva team (F. Vernizzi and R. Durrer) have derived a general formalism for perturbation theory in brane universes. This derivation was a major formal effort and we hope to use the formalism in the future to calculate especially CMB anisotropies for brane universes and to make specific predictions in order to test the hypothesis whether our universe is a 3 + 1 dimensional membrane embedded in a higher dimensional spacetime (see last ref. below).
A2. Joint Publications
R. Trotta, A. Riazuelo, R. Durrer, Cosmic Microwave Background anisotropies with mixed isocurvature perturbations, Phys. Rev. Lett. 87 (2001) 231301
astro-ph/0104017 (Paris-Geneva)
R. Bowen, S. H. Hansen, A. Melchiorri, J. Silk, R. Trotta}, The Impact of an Extra Background of Relativistic Particles on the Cosmological Parameters derived from Microwave Background Anisotropies, Mon. Not. Roy. Astron. Soc. 334 (2002) 760
astro-ph/0110636 (Oxford-Geneva)
C.J.A.P. Martins , A. Melchiorri, R. Trotta, R. Bean, G. Rocha, P.P. Avelino, P.T.P. Viana, Measuring in the Early Universe: CMB Temperature, Large-Scale Structure and Fisher Matrix
Analysis, Phys. Rev. D66 (2002) 023505
astro-ph/0203149 (Cambridge-Oxford-Geneva)
A. Riazuelo, F. Vernizzi, D. Steer and R. Durrer
Gauge invariant cosmological perturbation theory for braneworlds, hep-th/0205220 (Paris-Geneva)
B2. Training information
This year we had no young researcher paid by the network. However, the graduate student Roberto Trotta who is collaborating with the Oxford and Roma teams has profitted in his formation by visits in Rome and Oxford and by participating in a CMB conference in Moriond. We also had Alessandro Melchiorri visiting Geneva on two occasions.
|
