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Centro de Astrofísica da Universidade do Porto

Constraining recent oscillations in quintessence models with Euclid

N. A. Lima, P. T. P. Viana, I. Tereno

Euclid is a future space-based mission that will constrain dark energy with unprecedented accuracy. Its photometric component is optimized for weak lensing studies, while the spectroscopic component is designed for baryon acoustic oscillations (BAO) analysis. We use the Fisher matrix formalism to make forecasts on two quintessence dark energy models with a dynamical equation of state that leads to late-time oscillations in the expansion rate of the Universe. We find that weak lensing will place much stronger constraints than the BAO, being able to discriminate between oscillating models by measuring the relevant parameters to 1sigma precisions of 5-20 per cent. The tight constraints suggest that Euclid data could identify even quite small late-time oscillations in the expansion rate of the Universe.

cosmology: observations, dark energy

Monthly Notices of the Royal Astronomical Society
Volume 441, Page 3231
July 2014

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Institute of Astrophysics and Space Sciences

Institute of Astrophysics and Space Sciences (IA) is a new but long anticipated research infrastructure with a national dimension. It embodies a bold but feasible vision for the development of Astronomy, Astrophysics and Space Sciences in Portugal, taking full advantage and fully realizing the potential created by the national membership of the European Space Agency (ESA) and the European Southern Observatory (ESO). IA resulted from the merging the two most prominent research units in the field in Portugal: the Centre for Astrophysics of the University of Porto (CAUP) and the Center for Astronomy and Astrophysics of the University of Lisbon (CAAUL). It currently hosts more than two-thirds of all active researchers working in Space Sciences in Portugal, and is responsible for an even greater fraction of the national productivity in international ISI journals in the area of Space Sciences. This is the scientific area with the highest relative impact factor (1.65 times above the international average) and the field with the highest average number of citations per article for Portugal.

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