By Lemos J.P. (ed.)

ISBN-10: 9810246994

ISBN-13: 9789810246990

Lawsuits of the tenth Portuguese assembly: Centra, Lisbon, Portugal, 27-28 July 2000

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**Example text**

From the previous equation we see that for high energies (p > At) the quadratic term dominates; later on during the radiation epoch, this term will be redshifted by a factor a~8 and should therefore become negligible. In order that no incompatibilities arise with nucleosynthesis the brane tension must satisfy Xb > lMeV 4 , implying M5 > lOTeV 16 . Here we will mainly be interested in the case where the quadratic term in p dominates during inflation, that is A6 < V. As in the case of hybrid inflation in the standard four-dimensional context, the masses m and M cannot be freely chosen but are constrained by the COBE normalization of the spectrum of density perturbations.

Acknowledgments DB would like to thank the organization for the lively meeting and financial support. Also, special thanks are due to " 0 Pavao" for the seafood inspiration. Domingos Barbosa acknowledges FCT support under a PRAXIS-XXI grant. We acknowledge the MAXIMA collaboration for helpful discussions and LBL for computer support. 24 Figure 3. View of the MAXIMA gondola. From Lee 6 References 1. 2. 3. 4. 5. 6. S. Hanany et al, ApJ 545, L5 (2000) P. de Bernardis et al, Nature 404, 955 (2000) A.

1995; Schmidt et al. 1995). With this capability, the study of type la supernovae at high redshifts as standard candles to measure cosmological parameters become a major task in observational cosmology. According to the scientific results fom the study of high redshift supernova obtained independently by the Supernova Cosmology Project (SCP) (Perlmutter et al. 1997b,1999) and the High-z supernova search team (Riess et al. 1998; Schmidt et al. 1998), the Universe will expand forever and is accelerating, due to a positive cosmological constant (Bahcall et al.

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