Several extensions of General Relativity and high energy physics include scalar fields as extra degrees of freedom. In the search for predictions in the non-linear regime of cosmological evolution, the community makes use of numerical simulations in which the quasi-static limit is assumed when solving the equation of motion of the scalar field. In an effort to assess the reliability of the static approximation, I am developing new algorithms which are being incorporated into a new N-body code that was written from scratch to study modified gravities. I will present the method, and show results obtained from non-static simulations in the context of the symmetron model. These simulations show striking differences with respect to the commonly used quasi-static approximation. This novel procedure reveals new physical properties of the scalar field and concealed astrophysical phenomena which were hidden in the old approach.
Fredagskollokvium: Claudio Llinares: Cosmological simulations beyond the static approximation
Claudio Llinares, postdoktor, Institutt for teoretisk astrofysikk
Publisert 22. apr. 2013 11:22
- Sist endret 25. apr. 2013 13:30