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SUMMARY:Releasing scalar fields:  cosmological simulations beyond the stat
 ic approximation - Claudio Llinares (Oslo)
DTSTART:20130208T130000Z
DTEND:20130208T140000Z
UID:TALK42075@talks.cam.ac.uk
CONTACT:Dr Joan Camps
DESCRIPTION:Several extensions of General Relativity and high energy physi
 cs include scalar fields as extra degrees of freedom.  In the search for p
 redictions in the non-linear regime of cosmological evolution\, the commun
 ity 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 ef
 fort to assess the reliability of the static approximation\, I am developi
 ng 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 con
 text of the symmetron model. These simulations show striking differences w
 ith respect to the commonly used quasi-static approximation. This novel pr
 ocedure reveals new physical properties of the scalar field and concealed 
 astrophysical phenomena which were hidden in the old approach.
LOCATION:Pavilion B Potter Room (B1.19)
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