Theory Meets Data Analysis at Comparable and Extreme Mass Ratios http://pirsa.org/podcast/C10015 Science 2013 http://blogs.law.harvard.edu/tech/rss en-ca Sun, 19 May 2013 17:13:47 -0400 sbradwell@perimeterinstitute.ca Sun, 19 May 2013 17:13:47 -0400 G 180 pirsa-admin@perimeterinstitute.ca Steve Bradwell's - Podcast Generator TBA Sam Dolan http://streamer.perimeterinstitute.ca/mp3/5a8773f3-ccce-465d-9c67-e704ae42de66.mp3 Science http://streamer.perimeterinstitute.ca/mp3/5a8773f3-ccce-465d-9c67-e704ae42de66.mp3 Sun, 20 Jun 2010 09:10:00 -0400 TBA Niels Warburton http://streamer.perimeterinstitute.ca/mp3/eca9b24b-d8d2-4647-b800-2c0e64073274.mp3 Science http://streamer.perimeterinstitute.ca/mp3/eca9b24b-d8d2-4647-b800-2c0e64073274.mp3 Sun, 20 Jun 2010 09:30:00 -0400 TBA Sarp Akcay http://streamer.perimeterinstitute.ca/mp3/7b1d4337-9c3b-407e-aa7b-96e313eb71e6.mp3 Science http://streamer.perimeterinstitute.ca/mp3/7b1d4337-9c3b-407e-aa7b-96e313eb71e6.mp3 Sun, 20 Jun 2010 09:50:00 -0400 TBA Lior Burko http://streamer.perimeterinstitute.ca/mp3/0431c484-2629-48c6-a922-8a0d6da06638.mp3 Science http://streamer.perimeterinstitute.ca/mp3/0431c484-2629-48c6-a922-8a0d6da06638.mp3 Sun, 20 Jun 2010 10:10:00 -0400 TBA Carlos Sopuerta http://streamer.perimeterinstitute.ca/mp3/3cc05d52-3f44-46ab-8460-ff3c3d8bb61b.mp3 Science http://streamer.perimeterinstitute.ca/mp3/3cc05d52-3f44-46ab-8460-ff3c3d8bb61b.mp3 Sun, 20 Jun 2010 14:00:00 -0400 TBA Priscilla Canizares http://streamer.perimeterinstitute.ca/mp3/2e873fae-f68d-4c5b-b2e4-230b8e2712a2.mp3 Science http://streamer.perimeterinstitute.ca/mp3/2e873fae-f68d-4c5b-b2e4-230b8e2712a2.mp3 Sun, 20 Jun 2010 14:20:00 -0400 TBA John Friedman http://streamer.perimeterinstitute.ca/mp3/f6caff0e-cf8c-4920-a79e-0b52716d91fe.mp3 Science http://streamer.perimeterinstitute.ca/mp3/f6caff0e-cf8c-4920-a79e-0b52716d91fe.mp3 Sun, 20 Jun 2010 14:40:00 -0400 TBA Norichika Sago http://streamer.perimeterinstitute.ca/mp3/80441c62-cd4c-4887-b291-27225ea5f96a.mp3 Science http://streamer.perimeterinstitute.ca/mp3/80441c62-cd4c-4887-b291-27225ea5f96a.mp3 Sun, 20 Jun 2010 15:00:00 -0400 TBA Jonathan Thornburg http://streamer.perimeterinstitute.ca/mp3/4a710a91-8876-4aa7-83e3-b2c7315e6f62.mp3 Science http://streamer.perimeterinstitute.ca/mp3/4a710a91-8876-4aa7-83e3-b2c7315e6f62.mp3 Sun, 20 Jun 2010 15:20:00 -0400 TBA Peter Zimmerman http://streamer.perimeterinstitute.ca/mp3/b9d5ed0d-d805-474f-9204-cfb60910cd6d.mp3 Science http://streamer.perimeterinstitute.ca/mp3/b9d5ed0d-d805-474f-9204-cfb60910cd6d.mp3 Sun, 20 Jun 2010 15:40:00 -0400 TBA Steven Detweiler http://streamer.perimeterinstitute.ca/mp3/8cd48817-4a74-41fd-94b4-029f8f449898.mp3 Science http://streamer.perimeterinstitute.ca/mp3/8cd48817-4a74-41fd-94b4-029f8f449898.mp3 Mon, 21 Jun 2010 09:10:00 -0400 Motivated by the goal of self-consistently calculating self-force-corrected orbits and waveforms with (3+1) evolution codes we derive a covariant expression for a non-singular representation of a scalar point charge moving along a geodesic of an arbitrary spacetime. This differs from previous representations that were anchored to the use a particular locally-inertial coordinate system. Ian Vega http://streamer.perimeterinstitute.ca/mp3/80403f17-5f4c-47a3-8480-40449739e6c7.mp3 Science http://streamer.perimeterinstitute.ca/mp3/80403f17-5f4c-47a3-8480-40449739e6c7.mp3 Mon, 21 Jun 2010 09:30:00 -0400 TBA Barry Wardell http://streamer.perimeterinstitute.ca/mp3/1c7f3c43-7d62-4560-9815-655b874ba4b4.mp3 Science http://streamer.perimeterinstitute.ca/mp3/1c7f3c43-7d62-4560-9815-655b874ba4b4.mp3 Mon, 21 Jun 2010 09:50:00 -0400 TBA Peter Diener http://streamer.perimeterinstitute.ca/mp3/6e0ccdb1-b379-4cd0-bcd4-6e03058c68a3.mp3 Science http://streamer.perimeterinstitute.ca/mp3/6e0ccdb1-b379-4cd0-bcd4-6e03058c68a3.mp3 Mon, 21 Jun 2010 10:10:00 -0400 TBA Alessandro Spallicci http://streamer.perimeterinstitute.ca/mp3/3c3c0612-878c-45da-ab99-308f5f48efac.mp3 Science http://streamer.perimeterinstitute.ca/mp3/3c3c0612-878c-45da-ab99-308f5f48efac.mp3 Mon, 21 Jun 2010 14:00:00 -0400 TBA Tanja Hinderer http://streamer.perimeterinstitute.ca/mp3/52c1c0e9-40ea-40c2-beff-4a13adcae913.mp3 Science http://streamer.perimeterinstitute.ca/mp3/52c1c0e9-40ea-40c2-beff-4a13adcae913.mp3 Mon, 21 Jun 2010 14:20:00 -0400 TBA Sam Gralla http://streamer.perimeterinstitute.ca/mp3/0f04479a-ad13-47de-8bb9-b344bbbaac94.mp3 Science http://streamer.perimeterinstitute.ca/mp3/0f04479a-ad13-47de-8bb9-b344bbbaac94.mp3 Mon, 21 Jun 2010 14:40:00 -0400 TBA Theodore Drivas http://streamer.perimeterinstitute.ca/mp3/c244da7d-b34a-42d1-b948-6e8351849376.mp3 Science http://streamer.perimeterinstitute.ca/mp3/c244da7d-b34a-42d1-b948-6e8351849376.mp3 Mon, 21 Jun 2010 15:00:00 -0400 TBA Marc Favata http://streamer.perimeterinstitute.ca/mp3/132100ea-912f-4064-bce3-caaa56a5efe6.mp3 Science http://streamer.perimeterinstitute.ca/mp3/132100ea-912f-4064-bce3-caaa56a5efe6.mp3 Mon, 21 Jun 2010 15:20:00 -0400 TBA Bernard Whiting http://streamer.perimeterinstitute.ca/mp3/e6a0820c-dcc4-4df0-acb1-6161db368f49.mp3 Science http://streamer.perimeterinstitute.ca/mp3/e6a0820c-dcc4-4df0-acb1-6161db368f49.mp3 Mon, 21 Jun 2010 15:40:00 -0400 TBA Abraham Harte http://streamer.perimeterinstitute.ca/mp3/b3df42a4-5cc7-4216-b65d-95052ca954a1.mp3 Science http://streamer.perimeterinstitute.ca/mp3/b3df42a4-5cc7-4216-b65d-95052ca954a1.mp3 Tue, 22 Jun 2010 09:30:00 -0400 TBA Alexandre Le Tiec http://streamer.perimeterinstitute.ca/mp3/8272c33b-6506-49b4-bcf8-b8b7f20ad0b8.mp3 Science http://streamer.perimeterinstitute.ca/mp3/8272c33b-6506-49b4-bcf8-b8b7f20ad0b8.mp3 Tue, 22 Jun 2010 14:00:00 -0400 TBA Ian Vega http://streamer.perimeterinstitute.ca/mp3/e2c1ba16-058e-4078-989b-f8c951cf5622.mp3 Science http://streamer.perimeterinstitute.ca/mp3/e2c1ba16-058e-4078-989b-f8c951cf5622.mp3 Tue, 22 Jun 2010 15:00:00 -0400 Gravitational wave data analysis of compact binary systems requires the use of matched filtering. This technique cross-correlates the data stream with a certain template that characterizes the gravitational wave signal. Successful parameterestimation thus requires an accurate model of the gravitational wave template. In this talk I will describe a new fast and accurate technique to model the gravitational wave signal from extreme-mass ratio inspirals. Such events consisting of a neutron star or solar mass black hole spiraling into a supermassive black hole are staple sources of the Laser Interferometer Space Antenna. This new model combines the effective-one-body formalism of post-Newtonian theory and black hole perturbation theory leading to accurate waveforms both when the supermassive black hole spins and when it does not. Nicolas Yunes http://streamer.perimeterinstitute.ca/mp3/ea512640-ee84-4aa3-992f-d14be5cacdcc.mp3 Science http://streamer.perimeterinstitute.ca/mp3/ea512640-ee84-4aa3-992f-d14be5cacdcc.mp3 Wed, 23 Jun 2010 11:30:00 -0400 We present a second order perturbative formalism that includeperturbative spin effects and apply it to the computation of recoil velocites of merging binary black holes and to the computation of waveforms from small mass ratio binaries. Hiroyuki Nakano http://streamer.perimeterinstitute.ca/mp3/02117a98-e060-4814-bf31-9cf1e8e51061.mp3 Science http://streamer.perimeterinstitute.ca/mp3/02117a98-e060-4814-bf31-9cf1e8e51061.mp3 Wed, 23 Jun 2010 13:00:00 -0400 Recent numerical simulations of spinning binary black holes have found that the orbital plane tends to bob up and down in phase with the orbit. It will be shown that similar effects occur in nearly all relativistic systems. The reasons for this are essentially kinematic and appear unrelated to those leading to the final "kicks" observed after merger. Simple examples are provided for binary systems bound together by gravitational electromagnetic and mechanical forces. Abraham Harte http://streamer.perimeterinstitute.ca/mp3/6260de5f-169f-40e9-b681-ef632fa9c828.mp3 Science http://streamer.perimeterinstitute.ca/mp3/6260de5f-169f-40e9-b681-ef632fa9c828.mp3 Wed, 23 Jun 2010 13:30:00 -0400 Black holes play a central role in astrophysics and in physics more generally. Candidate black holes are nearly ubiquitous in nature. They are found in the cores of nearly all galaxies, and appear to have resided there since the earliest cosmic times. They are also found throughout the galactic disk as companions to massive stars. Though these objects are almost certainly black holes, their properties are not very well constrained. We know their masses (often with errors that are factors of a few), and we know that they are dense. In only a handful of cases do we have information about their spins. Gravitational-wave measurements will enable us to rectify this situation. Focusing largely on measurements with the planned space-based detector LISA, I will describe how gravitational-wave measurements will allow us to measure both the masses and spins of black holes with percent-level accuracy even to high redshift, allowing us to track their growth and evolution over cosmic time. I will also describe how a special class of sources will allow us to measure the multipolar structure of candidate black hole spacetimes. This will make it possible to test the no-hair theorem, and thereby to test the hypothesis that black hole candidates are in fact black holes are described by general relativity. Scott Hughes http://streamer.perimeterinstitute.ca/mp3/26d1d631-8b04-4ed5-a20f-57d324012693.mp3 Science http://streamer.perimeterinstitute.ca/mp3/26d1d631-8b04-4ed5-a20f-57d324012693.mp3 Wed, 23 Jun 2010 14:00:00 -0400 With several ground-based gravitational wave interferometers operating at design sensitivity the need for high-order post-Newtonian (PN) calculations of potentials waveforms etc. especially including spin effects has grown significantly over the last several years. Not only are these calculations necessary for precisely estimating the parameters of detected gravitational wave sources but they are also useful for providing more accurate models of binary evolutions in for example the effective one-body program and for computing the PN contributions to self-force effects in the extreme mass ratio limit. Since these calculations become more demanding to carry out at higher PN orders it is necessary to utilize symbolic computer algebra programs (such as Mathematica). Our aim is to automate PN calculations (of potentials power loss etc.) on the computer using the effective field theory (EFT) approach of Goldberger and Rothstein which is itself a systematic and algorithmic method for computing in the PN approximation. The EFT approach lends itself to automation through definite power counting rules that identify precisely those interactions appearing at a given PN order through Feynman rules and diagrams that provide an elegant way to side-step the need to explicitly solve the wave equation for metric perturbations (unlike in traditional methods) through working at the level of the action (a scalar) instead of equations of motion etc. We discuss our progress in automating these calculations on a computer using the EFT approach. Chad Galley http://streamer.perimeterinstitute.ca/mp3/c752d28c-7c0d-419a-89c8-f5de41835a28.mp3 Science http://streamer.perimeterinstitute.ca/mp3/c752d28c-7c0d-419a-89c8-f5de41835a28.mp3 Wed, 23 Jun 2010 15:30:00 -0400 N/A Eric Poisson,Emanuele Berti,Patrick Brady http://streamer.perimeterinstitute.ca/mp3/5e718e5e-53b1-4ba2-87a1-4c6210a96f4e.mp3 Science http://streamer.perimeterinstitute.ca/mp3/5e718e5e-53b1-4ba2-87a1-4c6210a96f4e.mp3 Wed, 23 Jun 2010 16:00:00 -0400 TBA Michael Boyle http://streamer.perimeterinstitute.ca/mp3/407f4373-b70f-4812-b554-b273c9fe45cb.mp3 Science http://streamer.perimeterinstitute.ca/mp3/407f4373-b70f-4812-b554-b273c9fe45cb.mp3 Thu, 24 Jun 2010 09:00:00 -0400 Recent progress in numerical- and analytical relativity enables us to construct analytical waveform templates coherently describing the inspiral, merger and ring down of coalescing black-hole binaries. Such waveform templates not only improve the sensitivity of the searches for gravitational waves from high-mass binaries significantly, but also the accuracy of the parameter estimation. This talk summarizes the status and prospects of different approaches of the modeling of gravitational waveform from binary black holes calibrated to numerical- relativity simulations. Parameswaran Ajith http://streamer.perimeterinstitute.ca/mp3/15bb80bd-8e70-4078-86f9-c812934548ca.mp3 Science http://streamer.perimeterinstitute.ca/mp3/15bb80bd-8e70-4078-86f9-c812934548ca.mp3 Thu, 24 Jun 2010 10:30:00 -0400 The initial gold rush of exploration into new regions of parameter space has slowed significantly. While our ability to simulate larger spins and more extreme mass ratios has continued to improve, much of the recent progress in numerical relativity has centered on improvements in methodology, in condensing and interpreting an ever-growing body of numerical results, and in incorporating matter into the numerical simulations. In this review, I will summarize the recent progress in this field, focusing on novel results in the simulation of black hole binaries, with some discussion of novel applications of those results to data analysis. Sean McWilliams http://streamer.perimeterinstitute.ca/mp3/99209d0e-edfc-4680-a198-f804e07258f5.mp3 Science http://streamer.perimeterinstitute.ca/mp3/99209d0e-edfc-4680-a198-f804e07258f5.mp3 Thu, 24 Jun 2010 13:30:00 -0400 N/A Bernard Kelly http://streamer.perimeterinstitute.ca/mp3/1d607d61-59bb-4475-87e3-9577719197fe.mp3 Science http://streamer.perimeterinstitute.ca/mp3/1d607d61-59bb-4475-87e3-9577719197fe.mp3 Thu, 24 Jun 2010 14:30:00 -0400 n/a Geoffrey Lovelace http://streamer.perimeterinstitute.ca/mp3/ad65085b-91f2-471e-903e-f495678bd5a3.mp3 Science http://streamer.perimeterinstitute.ca/mp3/ad65085b-91f2-471e-903e-f495678bd5a3.mp3 Thu, 24 Jun 2010 14:35:00 -0400 n/a Maria Babiuc-Hamilton http://streamer.perimeterinstitute.ca/mp3/7b509e05-bc24-47df-b0e7-56da42ae63df.mp3 Science http://streamer.perimeterinstitute.ca/mp3/7b509e05-bc24-47df-b0e7-56da42ae63df.mp3 Thu, 24 Jun 2010 14:40:00 -0400 n/a Harald Pfeiffer http://streamer.perimeterinstitute.ca/mp3/d2700757-0265-41ed-8165-e492392dda87.mp3 Science http://streamer.perimeterinstitute.ca/mp3/d2700757-0265-41ed-8165-e492392dda87.mp3 Thu, 24 Jun 2010 14:45:00 -0400 n/a Larne Pekowsky http://streamer.perimeterinstitute.ca/mp3/ec0e7cfe-80ab-40e8-bab3-852dbb6eab8d.mp3 Science http://streamer.perimeterinstitute.ca/mp3/ec0e7cfe-80ab-40e8-bab3-852dbb6eab8d.mp3 Thu, 24 Jun 2010 14:50:00 -0400 In this talk I will show recent results obtained by the RIT group fromsimulations of highly-spinning binaries including new data that givesnear maximal spins and high-mass ratio binaries. Simulations in bothof these regimes are numerically challenging. However asastrophysical binaries are expected to be highly-spinning and havehigh mass ratios accurate simulations in these regimes are crucialfor understanding the dynamics of realistic binaries. Yosef Zlochower http://streamer.perimeterinstitute.ca/mp3/06334b53-0721-4b24-b650-af827ab8ff53.mp3 Science http://streamer.perimeterinstitute.ca/mp3/06334b53-0721-4b24-b650-af827ab8ff53.mp3 Thu, 24 Jun 2010 16:30:00 -0400 TBA Mark Hannam http://streamer.perimeterinstitute.ca/mp3/5c430b67-0c44-4bf7-99c0-1acb517ce117.mp3 Science http://streamer.perimeterinstitute.ca/mp3/5c430b67-0c44-4bf7-99c0-1acb517ce117.mp3 Thu, 24 Jun 2010 16:50:00 -0400 We present simulations of non-spinning unequal mass black-hole binaries with mass ratio q=1/4 covering approximately 11 orbits prior to coalescence and merger obtained with the moving puncture technique. Accuracy of the simulations and matching to post-Newtonian waveforms is discussed. Ulrich Sperhake http://streamer.perimeterinstitute.ca/mp3/b08cb1d0-5b5e-496d-945a-a316fa0c4bfd.mp3 Science http://streamer.perimeterinstitute.ca/mp3/b08cb1d0-5b5e-496d-945a-a316fa0c4bfd.mp3 Thu, 24 Jun 2010 17:10:00 -0400 In this talk we present the motivation behind our implementation of and results from a coherent search for spinning compact binary coalescences. Our method uses the Physical template family of waveforms which describe binaries where only one of the objects has spin. In addition we discuss the possibility of extending thissearch to incorporate template waveforms for precessing black hole mergers derived from numerical relativity. Stephen Fairhurst http://streamer.perimeterinstitute.ca/mp3/0962b72e-7404-4236-8d34-d0ae9c646faa.mp3 Science http://streamer.perimeterinstitute.ca/mp3/0962b72e-7404-4236-8d34-d0ae9c646faa.mp3 Thu, 24 Jun 2010 17:30:00 -0400 A coherent multi-site search is expected to be more powerful than itscoincident counterpart in discriminating gravitational wave (GW) signals fromthe noise background. This is because the former tests the consistency of thesignals' amplitudes phases and time-delays across the sites with those expected from a real GW source. However the coherent statistic that is optimalin Gaussian noise is not guaranteed to perform as well in real data which arenon-Gaussian. Here we introduce an alternative coherent statistic for searchingcompact binary coalescence (CBC) signals that includes chi-square andnull-stream discriminators for non-Gaussian features in the data. Thisstatistic has been found to perform better than coincident statistics exploredin real data. This alternative coherent statistic is being used in ongoinginspiral-merger-ringdown searches in LIGO-Virgo data and is expected to beuseful in bridging the performance gap between the coincident CBC searchpipeline and the coherent burst search pipeline for detecting signalshigh-mass CBCs especially for systems with total-mass tending toward ahundred solar masses that have only a few signal cycles in band. We planto use this statistics in future NINJA analysis. Thilina Dayanga http://streamer.perimeterinstitute.ca/mp3/47b9ea3d-b217-4c1a-bcf1-c6fe8c8997bd.mp3 Science http://streamer.perimeterinstitute.ca/mp3/47b9ea3d-b217-4c1a-bcf1-c6fe8c8997bd.mp3 Thu, 24 Jun 2010 17:50:00 -0400 TBA Craig Robinson http://streamer.perimeterinstitute.ca/mp3/7e3af589-06df-4439-b532-e79d3edcb4a6.mp3 Science http://streamer.perimeterinstitute.ca/mp3/7e3af589-06df-4439-b532-e79d3edcb4a6.mp3 Fri, 25 Jun 2010 09:00:00 -0400 The familiar post-Newtonian inspiral description of a binary neutron star system is sufficient for detection in current instruments. However, as we consider making astrophysical measurements using advanced detectors, the effects of matter and strong gravity on gravitational wave signals may become significant. I will review recent work modelling the waveforms produced by the inspiral and coalescence of binary neutron stars. In the mid-to-late inspiral this includes modifications to the post-Newtonian waveform models from tidal deformations. In the late inspiral and coalescence, numerical simulations are exploring a range of masses, mass ratios, equations of state, and magnetic fields. In some circumstances a hypermassive remnant produces significant additional signal after the merger. Numerical simulation results also link neutron-star merger to potential counterpart signals. Jocelyn Read http://streamer.perimeterinstitute.ca/mp3/e2c072e8-096b-493e-a377-f2c285f34ec8.mp3 Science http://streamer.perimeterinstitute.ca/mp3/e2c072e8-096b-493e-a377-f2c285f34ec8.mp3 Fri, 25 Jun 2010 10:30:00 -0400 Black hole-neutron star binary (BHNS) mergers are likely sources for detectable gravitational radiation and candidate engines for short-hard gamma-ray bursts. However, accurate modeling of these mergers requires fully general relativistic simulations, incorporating both relativistic hydrodynamics for the matter and Einstein's field equations for the (strong) gravitational fields. I will review techniques and results from recent fully general relativistic BHNS merger simulations. These simulations examine the effects of the BH:NS mass ratio, BH spin, and NS equation of state, focusing on both the gravitational waveforms and remnant disk. Zachariah Etienne http://streamer.perimeterinstitute.ca/mp3/17232a3e-9a44-4424-b086-7d05702c5622.mp3 Science http://streamer.perimeterinstitute.ca/mp3/17232a3e-9a44-4424-b086-7d05702c5622.mp3 Fri, 25 Jun 2010 13:30:00 -0400 TBA Abdul Mroue http://streamer.perimeterinstitute.ca/mp3/8d9ea8f7-dcbd-4cfb-af9c-e68f96c2b4aa.mp3 Science http://streamer.perimeterinstitute.ca/mp3/8d9ea8f7-dcbd-4cfb-af9c-e68f96c2b4aa.mp3 Fri, 25 Jun 2010 14:30:00 -0400 TBA James Healy http://streamer.perimeterinstitute.ca/mp3/e3533524-311d-44ba-9a11-c6bb504096da.mp3 Science http://streamer.perimeterinstitute.ca/mp3/e3533524-311d-44ba-9a11-c6bb504096da.mp3 Fri, 25 Jun 2010 14:50:00 -0400 Most searches with ground-based detectors for gravitational-wave signals from the inspirals of stellar-mass compact binaries use template based methods. Those work well for non-spinning systems but since the dimensionality of the parameter space of spinning waveforms is large a template bank search is not feasible. We describe Bayesian and Markov-chain Monte-Carlo methods for parameter estimation of spinning waveforms using hybrid spinning waveforms matching the ringdown from Numerical Relativity results. We compare those results when using post-Newtonian only waveforms. We explore the parameter space and discuss different ways to overcome its high dimensionality and multi-modality. Vivien Raymond http://streamer.perimeterinstitute.ca/mp3/741238f5-8ba9-49e2-a093-a2b7aef5dbf8.mp3 Science http://streamer.perimeterinstitute.ca/mp3/741238f5-8ba9-49e2-a093-a2b7aef5dbf8.mp3 Fri, 25 Jun 2010 15:10:00 -0400 Recently generated asymptotic expansions zanolin et al. arXiv:0912.0065 [gr-qc] showa frequentist approach to go beyond Fisher information assessments of the accuracy for maximum likelihood parameter estimations. In this talk we describe the application of these techniques to directional reconstruction fornumerical relativity waveforms. MIchele Zanolin http://streamer.perimeterinstitute.ca/mp3/33d885fa-f405-4f8c-876d-4480a82f3e4d.mp3 Science http://streamer.perimeterinstitute.ca/mp3/33d885fa-f405-4f8c-876d-4480a82f3e4d.mp3 Fri, 25 Jun 2010 15:30:00 -0400 The quest for gravitational waves from binary inspiral is performed via matched filtering and thus requires a detailed knowledge of the signal. For non-precessing binaries complete analytic waveforms exist from inspiral to merger and ring-down. Here we present complete waveforms for generically spinning equal mass systems.They have been constructed by bridging the gap between the analytically known inspiral phase described by spin Taylor (T4) approximants in the restricted waveform approximation and the ring-down phase. These two phases are connected by a phenomenological intermediate phase calibrated by confrontation with numerically generated waveforms.The values of the overlap integral between numerical waveforms and our semi-analitic ones range between 0.96 and 0.99. Riccardo Sturani http://streamer.perimeterinstitute.ca/mp3/a24c3fdc-308c-4fbf-a2fc-c38eacf28d93.mp3 Science http://streamer.perimeterinstitute.ca/mp3/a24c3fdc-308c-4fbf-a2fc-c38eacf28d93.mp3 Fri, 25 Jun 2010 16:30:00 -0400 The dynamics of black-hole binaries is a very complex problem which has been solved only very recently through time-expensive numerical-relativity calculations. In spite of this mathematical complexity many results of these calculations can be accurately reproduced with phenomenological approaches based on test particles combined with Post-Newtonian theory and black-hole perturbation theory. In this talk I will focus on effective-one-body models, which have proved a useful and fast tool to accurately reproduce numerical-relativity waveforms. In particular I will present a novel, self-consistent effective-one-body model for spinning black-hole binaries, and show that this model does not suffer from the shortcomings of the existing models which have been put forward in the literature. Enrico Barausse http://streamer.perimeterinstitute.ca/mp3/c7d17931-851d-4d30-98e2-a42bfdd3cd82.mp3 Science http://streamer.perimeterinstitute.ca/mp3/c7d17931-851d-4d30-98e2-a42bfdd3cd82.mp3 Fri, 25 Jun 2010 16:50:00 -0400 I will review recent advances in the effective-one-body formalism aimed at describing the dynamics and gravitational-wave emission from coalescing black holes. I will discuss the implications of those advances for the search of gravitational waves from binary black holes and for the recoil velocity of black holes formed through merger. Yi Pan http://streamer.perimeterinstitute.ca/mp3/286f57ce-1e40-41b3-a437-b49c4ed6e063.mp3 Science http://streamer.perimeterinstitute.ca/mp3/286f57ce-1e40-41b3-a437-b49c4ed6e063.mp3 Fri, 25 Jun 2010 17:10:00 -0400 We present a new construction of phenomenological templates for non-precessing spinning black hole binaries. This approach utilizes a frequency domain matching of post-Newtonian inspiral waveforms with numerical relativity based binary black hole coalescence waveforms. We quantify the various possible sources of systematic errors that could arise in matching post-Newtonian and numerical relativity waveforms and we use a matching criteria based on minimizing these errors. An analytical formula for the dominant mode of the gravitational radiation of non-precessing black-hole binaries is presented that captures the phenomenology of the hybrid waveforms. Its implementation in the current searches for gravitational waves should allow cross-checks of other inspiral-merger-ringdown waveform families as well as an improvement of the reach of the detection algorithms. Frank Ohme http://streamer.perimeterinstitute.ca/mp3/d2ec180d-8fc7-4b76-998e-22e2b98e7dda.mp3 Science http://streamer.perimeterinstitute.ca/mp3/d2ec180d-8fc7-4b76-998e-22e2b98e7dda.mp3 Fri, 25 Jun 2010 17:30:00 -0400 Direct detection of gravitational wave stands at a cross roads; the first generation of interferometric detectors will soon be decommissioned and the second generation projects are underway. In this talk, I will describe the Initial LIGO and VIRGO generation of instruments, the techniques required to achieve a strain sensitivity of 3 x 10^{-23} and an NS / NS inspiral range of 15 Mpc. I'll follow with a description of the Advanced detectors and the differences that should improve the sensitivity by a factor of ten. Finally, I will describe projects from radio and microwave astronomy to measure gravitational waves using pulsar timing and the CMB B-mode polarization. Sam Waldman http://streamer.perimeterinstitute.ca/mp3/ea1b6050-28b8-4b66-8343-2041091df2c0.mp3 Science http://streamer.perimeterinstitute.ca/mp3/ea1b6050-28b8-4b66-8343-2041091df2c0.mp3 Sat, 26 Jun 2010 09:00:00 -0400 We describe a Markov-Chain Monte-Carlo technique to study the source parameters of gravitational-wave signals from the inspirals of stellar-mass compact binaries detected with ground-based detectors such as LIGO and Virgo. We can apply this technique to both spinning and non-spinning waveforms and we use a variety of tools like parallel tempering to improve the sampling efficiency of the algorithm in a multi-dimensional parameter space. We describe new developments in model-selection techniques for distinguishing between alternative signal models. We present preliminary results from the application of these techniques to data sets containing injections of numerical-relativity waveforms into simulated Gaussian detector noise. We study the source parameters of signals from the inspirals of stellar-mass compact binaries detected with ground-based gravitational-wave detectors such as LIGO and Virgo. We use automatic adaptation of the step size and take into account the correlations between parameters to efficiently probe the parameter space while keeping the algorithm suitable for a wide range of signals. We shall discuss the performance of the MCMC algorithm and the typical measurement accuracy of the source parameters as a function of the binary parameters and the number of detectors in the network. We will show that despite the lower positional accuracy compared to other astronomical observations an association of a gravitational-wave event with e.g. an electromagnetic detection is possible with three or even two 4-km-size interferometers. Ilya Mandel http://streamer.perimeterinstitute.ca/mp3/1a0a5eaa-b60c-4dd7-943e-571704765c19.mp3 Science http://streamer.perimeterinstitute.ca/mp3/1a0a5eaa-b60c-4dd7-943e-571704765c19.mp3 Sat, 26 Jun 2010 10:30:00 -0400 I will report on some recent results obtained using the fully general relativistic magnetohydrodynamic code Whisky in simulating equal and unequal-mass binary neutron star (BNS) systems during the last phases of inspiral, merger and collapse to black hole surrounded by a torus. BNSs are among the most important sources of gravitational waves which are expected to be detected by the current or next generation of gravitational wave detectors, such as LIGO and Virgo, and they are also thought to be at the origin of very important astrophysical phenomena, such as short gamma-ray bursts. I will in particular describe both the gravitational wave signals generated by these sources and the properties of the tori that can be formed. I will also describe how the Effective One Body (EOB) model can be used to accurately compute the gravitational wave signal generated during the inspiral of BNSs by comparing it with the longest general relativistic numerical simulations of BNSs performed up to now. Bruno Giacomazzo http://streamer.perimeterinstitute.ca/mp3/529e363b-7e2c-4739-925f-92b53bf66a15.mp3 Science http://streamer.perimeterinstitute.ca/mp3/529e363b-7e2c-4739-925f-92b53bf66a15.mp3 Sat, 26 Jun 2010 10:50:00 -0400 In this work we investigate the electromagnetic radiation induced by a binary black hole merger when they are surrounded by a force-free environment (i.e. plasma with inertia terms negligible compared to the electromagnetic stresses). We discuss the relevance of this system for possible multimessenger astronomy with binary black holes. Carlos Palenzuela http://streamer.perimeterinstitute.ca/mp3/b8199161-6f0f-4369-8306-9b851b735fe9.mp3 Science http://streamer.perimeterinstitute.ca/mp3/b8199161-6f0f-4369-8306-9b851b735fe9.mp3 Sat, 26 Jun 2010 11:10:00 -0400 We present a short overview on the current state of core-collapse supernova modeling and the set of processes expected to emit gravitational waves in a core collapse event. We go on to show new results from 3D GR simulations focusing on failing black-hole forming supernovae and present the gravitational wave signature of such events. Christian Ott http://streamer.perimeterinstitute.ca/mp3/8acb8e1f-caa8-4d6e-8559-dcb660d151d7.mp3 Science http://streamer.perimeterinstitute.ca/mp3/8acb8e1f-caa8-4d6e-8559-dcb660d151d7.mp3 Sat, 26 Jun 2010 11:30:00 -0400 In addition to the dominant oscillatory modes gravitational waves contain non-oscillatory components which arise as drifts or offsets in the signals. Nonlinear gravitational memory arises from a change in mass multipole moments of a boundsystem due to contributions from the emitted gravitationalwaves. In practice it appears as a slowly monotonically growingsignal during the inspiral which sees a rapid rise at thetime of merger. The low amplitude and non-oscillatory natureof these signals present unique challenges for modeling.I discuss recent efforts to evaluate these signals in numericalsimulations using characteristic extraction as well as theirpotential relevance to detection. Denis Pollney http://streamer.perimeterinstitute.ca/mp3/b16f2097-0edb-4798-91de-918e4f9e40af.mp3 Science http://streamer.perimeterinstitute.ca/mp3/b16f2097-0edb-4798-91de-918e4f9e40af.mp3 Sat, 26 Jun 2010 11:50:00 -0400 While gravitational waves offer a new, and in many ways clean, view of compact objects, most of what we presently know about these has been obtained by careful study of their messy interactions with surrounding material. I will summarize what we know about a variety of potential gravitational wave sources, how this astrophysical hair has helped to illuminate some of the same questions gravitational wave observations promise to address, and how future observations may begin to relate the gravitational and electromagnetic properties of compact objects. Avery Broderick http://streamer.perimeterinstitute.ca/mp3/ba11d2f6-7f33-4895-a2f8-ece40b9454e8.mp3 Science http://streamer.perimeterinstitute.ca/mp3/ba11d2f6-7f33-4895-a2f8-ece40b9454e8.mp3 Sat, 26 Jun 2010 13:30:00 -0400 N/A Christian Reisswig,Doreen Mueller,Philipp Moesta,Bruno Mundim http://streamer.perimeterinstitute.ca/mp3/104cd5b7-5bdc-4aaf-8aa2-382c417bfec8.mp3 Science http://streamer.perimeterinstitute.ca/mp3/104cd5b7-5bdc-4aaf-8aa2-382c417bfec8.mp3 Sat, 26 Jun 2010 14:30:00 -0400