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Approximation of the potential in scalar field dark energy models

Francesco Pace
Jodrell Bank Centre for Astrophysics, University of Manchester

One very simple idea to explain cosmic acceleration is to postulate a dark energy component dominated by a scalar field either with a canonical or non-canonical kinetic term. However, such models usually involve one or more arbitrary functions which would need to be specified before any model prediction could be made, such as the scalar field potential V(φ). An alternative approach is to specify the equation of state and derive the corresponding potential. Following this second approach, we study the nature of potentials in scalar field based models for dark energy.
I will present analytical solutions for few different forms of the Lagrangian and propose a general functional form for the potential around a~1, which can be used to infer the properties of the scalar field.

2016 July 12, 10:30

Faculdade de Ciências da Universidade de Lisboa (C6.2.51)
Campo Grande, 1749-016 Lisboa

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