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Constraints on cosmic opacity and beyond the standard model physics from cosmological distance measurements

Anastasios Avgoustidis
DAMTP & CTC, University of Cambridge

I will present recent constraints on cosmic opacity, obtained by combining SN Type Ia data with the latest measurements of the Hubble expansion at redshifts between 0 and 2. Various models of beyond the standard model physics that predict violation of photon number conservation contribute to cosmic opacity and can be equally constrained. I will discuss a number of such models involving axion-like particles, chameleons, and mini-charged particles, and will present constraints on the relevant coupling/mass parameters.

2010 November 19, 13:30

Centro de Astrofísica da Universidade do Porto (Auditorium)
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