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Constraining the evolution of the temperature of the universe with ESPRESSO and CODEX

Ana M. R. V. L. Monteiro

In this talk I will summarize the work I've done in the context of grant CAUP-03/2011-BII. One of the most precise cosmological measurements is the intensity spectrum of the CosmicMicrowave Background. If the expansion of the Universe is adiabatic and the CMB spectrum wasoriginally a black-body, its shape will be subsequently preserved with its temperature decreasingaccording to the law T(z)=T0(1+z). This temperature-redshift relation is one of the strongest predictionsof the standard model of cosmology, but it is violated in many non-standard models. Studying its redshiftdependence is therefore an efficient way to test the standard cosmological model and search for possiblenew physics.I will highlight some models that lead to violations of the standard T(z) laws and then discuss the bestobservational strategies to constrain them. This analysis will focus on improvements that will possiblewith the next generation of spectrographs such as ESPRESSO and CODEX.

2011 October 19, 13:30

Centro de Astrofísica da Universidade do Porto (Classroom)
Rua das Estrelas, 4150-762 Porto

Faculdade de Ciências da Universidade de Lisboa Universidade do Porto Faculdade de Ciências e Tecnologia da Universidade de Coimbra
Fundação para a Ciência e a Tecnologia COMPETE 2020 PORTUGAL 2020 União Europeia