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Agenda
for the parallel workshop sessions in Gravitational Waves.
All links marked with a⇓ can be used to show/hide the abstracts and presentations.
Click here to show/hide all presentations and abstracts and here for a print version.
You may also download the compact program booklet (PDF, 1.9 MB)
and an abstract booklet (PDF, 0.4 MB).
As long as authors provided us with PDF versions of their slides, the corresponding downloads are available on this page.
Thursday – Sep 8, 2011
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14:30 – 16:10 |
Gravitational Waves W1
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Parallel Session (Clubraum 3) – Chair:
Eugenio Coccia
14:30
(20' + 5')
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Past and future in the quest for gravitational wave transients⇓
slides
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Laura Cadonati (University of Massachusetts Amherst)
According to the Theory of General Relativity and current astrophysical understanding, the detection of gravitational wave transients will provide new insights on some of the most mysterious astrophysical objects and events, such as neutron stars, black holes and core-collapse supernovae, with potential cosmological implications.
This talk will review recent efforts in the quest for gravitational wave transients with LIGO and Virgo data, and give an outlook on future searches and detection potential in the approaching Advanced LIGO/Virgo era and beyond, in the context of a new multi-messenger astrophysics where combined input from electromagnetic, gravitational and particle signatures will yield a new, more complete understanding of the Universe.
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14:55
(20' + 5')
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Gravitational wave transients state-of-the-arts: Detection confidence and signal reconstruction⇓
slides
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Giovanni Andrea Prodi (University of Trento and INFN)
Making a convincing case for the first detection of transient signals is a primary goal of gravitational wave searches. Subsequent detections will rely on the reconstructed signal properties to impact gravitational wave astronomy. This talk will review recent progress in assessing the confidence of candidate events in searches for gravitational wave transients by the LIGO-Virgo network of detectors. We will review how the searches take advantage of general signal properties and reconstruct specific signal characteristics. In particular, we will present a case study provided by a blind challenge conducted during the most recent joint LIGO-Virgo science run.
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15:20
(20' + 5')
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Current status of LCGT project⇓
slides
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Shinji Miyoki (Institute for Cosmic Ray Research, University of Tokyo)
Large-scale Cryogenic Gravitational wave Telescope (LCGT) project has started in 2010 in Japan not only for direct gravitational wave (GW) detection but also forming a GW detection network with Advanced LIGO, Advanced VIRGO, GEO-HF and Australian group detector. LCGT takes two characteristic adoptions to obtain the targeted strain sensitivity of 3 x 10^-24 [1/rhz] around 100Hz. One is underground construction for stable detector operation. The other is usage of cryogenic mirrors and cryogenic mirror suspension system to reduce thermal noises. We will present detail designs of LCGT tunnel, vacuum, seismic noise isolator, mirror and length control scheme, digital system, cryostat and cryogenic suspension.
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15:45
(20' + 5')
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Electromagnetic follow-up of gravitational wave transient signal candidates⇓
slides
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Marica Branchesi (Università di Urbino/INFN Sezione di Firenze)
Pioneering efforts aiming at the development of multimessenger gravitational wave (GW) and electromagnetic (EM) astronomy have been made. An EM follow-up program of candidate GW events has been performed during the recent LIGO/Virgo runs. It involved ground-based and space EM facilities observing the sky at optical, X-ray and radio wavelengths. The joint GW/EM observation study requires the development of specific image analysis procedures able to discriminate the possible EM counterpart of GW triggers from contaminant events. An overview of the EM follow-up program and the image analysis procedures is presented. The current follow-up procedures represent a milestone towards the forthcoming advanced GW detector era, for which there will be a significant increase of the observational reach.
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16:50 – 18:40 |
Gravitational Waves W2
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Parallel Session (Clubraum 3) – Chair:
Szabolcs Marka
16:50
(15' + 5')
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Gravitational wave tricks for multi-messenger astronomy⇓
slides
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Bruce Allen (MPI for Gravitational Physics (Albert Einstein Institute) Hannover)
It is well-known that combining observations from the next generation of gravitational wave detectors with data from more conventional electromagnetic and neutrino detectors will yield new science. What is not so well known is that some of the data analysis methods and instrumentation developed for gravitational wave detection can also be profitably applied to electromagnetic data. I discuss the current status of these topics, along with some possible new opportunities for the future.
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17:10
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First Joint analysis between GW and HEN using LIGO/Virgo-ANTARES data⇓
slides
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Irene Di Palma (Max Planck Institut, AEI)
Multi-messenger astronomy is entering an exciting period with the recent development of experimental techniques that have opened new windows of observation of the cosmic radiation in all its components. Cataclysmic cosmic events can be plausible sources of both Gravitational Waves (GWs) and High Energy Neutrinos (HENs). Such messengers could reveal new, hidden sources that are not observed by conventional photon astronomy. Requiring consistency between GW and HEN detection channels shall enable new searches and a detection will yield significant additional information about the common source. A neutrino telescope such as ANTARES can determine accurately the time and direction of high energy neutrino events. A network of gravitational wave detectors such as LIGO and Virgo can also provide timing/directional information for gravitational wave bursts. By combining the information from these totally independent detectors, one can search for cosmic events that may arrive from common astrophysical sources. I will talk about the first joint analysis between GW and HENs using LIGO-Virgo and ANTARES data.
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17:30
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Searches for gravitational wave signals form rotating neutron stars⇓
slides
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Andrzej Krolak (Institute of Mathematics, Polish Academy of Sciences)
The LIGO Scientific Collaboration and Virgo Collaboration
carry out searches in LIGO and Virgo data for periodic
gravitational waves originating from rotating neutron stars.
There are several types of analyses:
targeted searches for known pulsars,
for which precise ephemerides from radio or
X-ray observations are used in matched filters,
directed searches for known stars
of unknown spin frequency or for new unknown sources
at specific locations, such as near the galactic center
or in globular clusters, all-sky searches for unknown neutron stars,
including stars in binary systems. Most of these searches
are computationally bound, requiring tradeoffs
in sensitivity to achieve large parameter space coverage.
We present the status of these searches. In particular
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17:50
(15' + 5')
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The Einstein Telescope: A third generation gravitational wave observatory⇓
slides
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Harald Lück (Max-Planck-Institut für Gravitationsphysik)
With the worldwide network of gravitational wave (GW) detectors currently being upgraded from the initial (first) to the advanced (second) generation, the direct detection of GWs is expected to happen within the next five years. Moving from the detection of GWs to an era of routine GW observation requires yet another large step in sensitivity improvement. The Einstein Telescope (ET) is a pan-European project for building an underground third generation GW observatory at a depth of about 100-200m in a seismically quiet location. The conceptual design study just concluded within the 7th Framework Programme of the EU foresees a triangular detector arrangement with a side length of 10km. This talk will present the major scientific goals of ET and technical challenges in reaching the sensitivity.
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18:10
(12' + 3')
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Vibrational excitation induced by electron beam and cosmic rays in normal and superconductive aluminum bars⇓
slides
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Francesco Ronga (INFN)
We report new measurements of the acoustic excitation of an Al5056 superconductive bar when hit by an electron beam, in a previously unexplored temperature range, down to 0.35 K.
These data, analyzed together with previous results of the RAP experiment obtained for T>0.54~K, show a vibrational response enhanced by a factor ~4.9 with respect to that measured in the normal state. This enhancement explains the anomalous large signals due to cosmic rays previously detected in the NAUTILUS gravitational wave detector.
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18:25
(12' + 3')
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A laser gyroscope system to detect the gravito-magnetic effect on Earth⇓
slides
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Angela D. V. Di Virgilio (INFN-Pisa)
We propose an under-ground based experiment to detect the general
relativistic effects due both to the curvature of space-time around the
Earth (de Sitter effect) and to the rotation of the planet (dragging of the
inertial frames or Lense-Thirring effect) by an off-line
comparison between IERS measurement of the Earth rotation vector and the
corresponding measurements obtained by a three-axial laser detector of
rotation. The detector is realized by six or more large ring-lasers arranged
along three orthogonal axes. To get a 1% sensitivity for the measurement
of the Lense-Thirring drag in 2 years of integration time, square rings of
6 m side, shot noise limited with a sensitivity of 6 prad/s/sqrt{Hz} are required. LNGS is a suitable location, and G-GranSasso the project name.
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