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

• f 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

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.

• 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...?)

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
• f merging systems?
• GW burst algorithms are sensitive to power - distribution into harmonics matters.

Tuesday, May 29, 12