Bulletin of the American Physical Society
2005 APS April Meeting
Saturday–Tuesday, April 16–19, 2005; Tampa, FL
Session C4: Space-Based Gravitational Wave Detection |
Hide Abstracts |
Sponsoring Units: GGR Chair: Scott Hughes, MIT Room: Marriott Tampa Waterside Grand Salon C/D |
Saturday, April 16, 2005 1:30PM - 2:06PM |
C4.00001: The contribution of inspiraling massive black hole binaries to the LISA data stream Invited Speaker: Massive black hole binaries, with masses in the range 1E3-1E8
Msun, are expected to be the most powerful sources of
gravitational radiation at mHz frequencies, and hence are among
the primary targets for the planned Laser Interferometer Space
Antenna (LISA). We detail the gravitational wave signal
expected from a cosmological population of massive black hole
binaries following the merger history of dark matter halos,
the dynamics of the massive black holes they host, and their
growth via gas accretion and binary coalescences in a LCDM
cosmology. Stellar dynamical processes dominates the orbital
evolution of black hole binaries at large separations, while
gravitational wave emission takes over at small radii, causing
the final coalescence of the pairs. We show that the GW signal
from this population, in a 3 year LISA observation, will be
resolved into approx 90 discrete events with S/N$>$5, among which
approx. 35 will be observed above threshold until coalescence.
These ``merging events'' involve relatively massive binaries,
M=10E5 Msun, in the redshift range $2 |
Saturday, April 16, 2005 2:06PM - 2:42PM |
C4.00002: Observing Galactic Binary Populations with LISA Invited Speaker: The Laser Interferometer Space Antenna (LISA) is a planned space- based gravitational wave detector that will be sensitive to gravitational waves in the mHz band. Although a wide variety of galactic and extra- galactic sources are expected in this band, the bulk of the signals will come from close compact-object binaries in the disk, halo, and globular cluster system of the Galaxy. The science reach of LISA and the information that can be gained from both the confusion-limited signal and individually resolved signals will be discussed. [Preview Abstract] |
Saturday, April 16, 2005 2:42PM - 3:18PM |
C4.00003: Gravitational waves from compact objects inspiralling into massive black holes Invited Speaker: A key source for LISA is the inspiral of compact objects into massive black holes. We review the useful information the gravitational waves will carry, and discuss recent progress in theoretical modeling of the gravitational waveforms. For these sources the radiation reaction timescale is longer than the orbital timescale by the ratio of the masses, so the inspiral is adiabatic. The leading order, adiabatic waveforms are those waveforms for which instantaneous errors are of order the mass ratio, and cumulative phase errors over the entire inspiral scale as the zeroth power of the mass ratio (i.e. are of order unity). Recently Yasushi Mino has shown that generic adiabatic waveforms can be computed using for the radiation reaction force the gradient of one half the difference between the retarded and advanced metric perturbations. We describe an explicit computational procedure for obtaining waveforms based on Mino's result, and argue that the computed waveforms will be sufficiently accurate for signal detection with LISA. Data-analysis templates will require higher accuracy, going beyond adiabaticity; this remains a significant challenge. [Preview Abstract] |
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