Jacksonville, 15 April 2007 Carlos Palenzuela (1), I.Olabarrieta (1),L. Lehner (1),S. Liebling (2) with contributions from M. Anderson (1), D. Neilsen.

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Presentation transcript:

Jacksonville, 15 April 2007 Carlos Palenzuela (1), I.Olabarrieta (1),L. Lehner (1),S. Liebling (2) with contributions from M. Anderson (1), D. Neilsen (3), E. Hirschmann (3) (1) Louisiana State University (Baton Rouge, Louisiana) (2) Long Island University (Long Island, New York) (3) Brigham Young University (Provo, Utah)

What is a boson star? Motivation Details of the numerical simulations 1) The head-on collision 2) The orbiting binary system Future work

Boson Star: compact body composed of a complex massive scalar field φ = φ 0 (r) e -iωt φ0 φ0 □ φ = m 2 φ KG eq. R ab = 8π (T ab – g ab T/2) EE  KG eq. does not form shock  the equation of state is given by the interaction potential

- Head-on collisions - Orbiting binary systems Evolution of 2 boson stars a) interaction of the scalar fields  look for imprints on their GW radiation that can constraint their existence with the GW detectors b) study common features of the 2-body interaction in GR

Equations & Initial Data - Generalized Harmonic formalism of the Einstein Equations - First order reduction of the EKG system in space and time - ID : superposition of single Boson Stars Numerical scheme - Method of Lines with 3 rd order Runge-Kutta - 2 nd Order Finite Difference space discretization Implementation: had infrastructure - Parallelization - Adaptative Mesh Refinement in space and time

φ = φ 1 (r – r 1 ) e -iωt + φ 2 (r – r 2 ) e -i(εωt+δ) ε = ± 1 : boson/antiboson δ : phase difference Study the interaction of different cases and their imprint on the gravitational radiation ( PRD 75, (2007) ) Configurations Boson/boson pair : ε = +1, δ = 0Boson/boson pair Boson/antiboson pair : ε = -1, δ = 0 Boson/boson in op. of phase pair of phase pair : ε = +1, δ = π/2 L=50 m 1 =m 2 =0.26 R=27

Boson/boson (BB) Boson/antiboson (BaB) Trajectories of the different cases and the (L=2 spherical harmonic modes of the) Ψ 4 BopB BaBBB Newtonian

L=32 m 1 =m 2 =0.50 R=12 ω=0.08 Configurations Boson/boson pair : ε = +1, δ = 0Boson/boson pair Boson/antiboson pair : ε = -1, δ = 0Boson/antiboson pair

Trajectories of the boson/boson and boson/antiboson pairs and the (L=2,M=2 spherical harmonic of the) Ψ 4 trajectories L=2,M=2 mode of Ψ 4 BaB BB

Compare the previous cases with orbiting binary Neutron Stars, BHs and Post-Newtonian results. Study the BH + BS case Study the dependence of the waveforms with the compactness of the bodies (M/R) BH + Boson Star