Modeling Compact Object Binaries Liebling & Shoemaker Mano a - PowerPoint PPT Presentation

Modeling Compact Object Binaries Liebling & Shoemaker Mano a Mano Tuesday, May 29, 12

Compact Binaries are both Transient and Inspiral Sources of GWs Where are we in vacuum BH+BH? • Ninja (Aylott et al CQG 2009, ...) • NRAR • Extremal spins (Lovelace et al CQG 2012) • Tackling Precessing Systems ( Schmidt et al PRD 2011, R. O’Shaughnessy PRD 2012, PRD 2011, Boyle et al PRD 2011) • Phenomenological Template Banks from NR (EOBNR, Ajith PRL 2011, ..., Sturani et al 2010) • Open Questions • Do the various evolutions agree with each other? Yes in NR (No in PN) • Accurate enough for GW observatories? Ohme et al PRD 2011 MacDonald et al CQG 2011 Tuesday, May 29, 12

State of the Art for Black Hole Binaries • Higher kicks (Lousto and Zlochower PRL 2011) • Will we be able to measure BH spin, a notoriously difficult parameter to measure? • Will BH spin correlate with BH power? • Do BH kicks address the question of whether SMBHs form before galaxy formation or after? • Approaching EMR (Lousto and Zlochower PRL 2011) • Eccentric black hole-neutron star mergers (East et al arxiv:1111.3055) • Eccentric binary neutron star mergers (Gold et al arxiv:109.5128) • EOS BH+NS Pannarale et al 2011, Markakis et al 2010 • How do we move from NR to search algorithms? • Templates? • Field et al PRL 2011 • Cannon et al PRD 2011 • Getting “bulk features” out? Tuesday, May 29, 12

BBH Mergers as Bursts? 2,2 mode U. Mass Amherst (also Fischetti PRD 2001) Tuesday, May 29, 12

Tests of GR & Alternate Theories of Gravity • Recent Work: Google Yunes and Will • Open Questions: • Is GR the appropriate gravity theory? • At what aspects of the GW signal should one look to constraint or rule out GR? • How will differences emerge (parameter biases...?) Late Inspiral and Merger of Binary Black Holes in Scalar-Tensor Theories of Gravity Healy et al arXiv: 1112.3928 Binary accretes the scalar field changing the dynamics, however, without a mechanism to induce dynamics on the scalar field, equivalent to GR in vacuum. Tuesday, May 29, 12

Not Astrophysics but nonetheless ... • NR/HEP: roadmap for the future Vitor Cardoso et al arXiv:1201.5118 • Collisions of charged black holes Miguel Zilhão et al arxiv:1205.1063 • Dynamics of black holes in de Sitter spacetimes Miguel Zilhao et al arxiv: 1204.2019 • Detectable seismic consequences of the interaction of a primordial black hole with Earth Yang Luo et al arXiv:1203.3806 • Superkicks in ultrarelativistic encounters of spinning black holes Sperhake et al arXiv:1011.328 • Head-on collisions of unequal mass black holes in D=5 dimensions Helvi Witek et al, arXiv:1011.0742 Tuesday, May 29, 12

Big Science Questions • Is it a Black Hole or Neutron Star? • Can NR collapse anything now? • What do we learn with GW only? EM only? Both? • Do not need templates, let’s take advantage and cover the full parameter space with “short runs”. • Need to catalogue robust features for GW Burst detection - What are the energetics of merging systems? • GW burst algorithms are sensitive to power - distribution into harmonics matters. Tuesday, May 29, 12