Péter Raffai

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D. V. Martynov, E. D. Hall, B. P. Abbott, R. Abbott, T. D. Abbott, C. Adams, R. X. Adhikari, R. A. Anderson, S. B. Anderson, K. Arai, M. A. Arain, S. M. Aston, L. Austin, S. W. Ballmer, M. Barbet, D. Barker, B. Barr, L. Barsotti, J. Bartlett, M. A. Barton, I. Bartos, J. C. Batch, A. S. Bell, I. Belopolski, J. Bergman, J. Betzwieser, G. Billingsley, J.(More)
Eric Thrane,* Shivaraj Kandhasamy, Christian D. Ott, Warren G. Anderson, Nelson L. Christensen, Michael W. Coughlin, Steven Dorsher, Stefanos Giampanis, Vuk Mandic, Antonis Mytidis, Tanner Prestegard, Peter Raffai, and Bernard Whiting School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA TAPIR, Caltech, Pasadena,(More)
A stochastic background of gravitational waves is expected to arise from a superposition of a large number of unresolved gravitational-wave sources of astrophysical and cosmological origin. It should carry unique signatures from the earliest epochs in the evolution of the Universe, inaccessible to standard astrophysical observations. Direct measurements of(More)
We present an approach to experimentally evaluate gravity gradient noise, a potentially limiting noise source in advanced interferometric gravitational wave (GW) detectors. In addition, the method can be used to provide sub-percent calibration in phase and amplitude of modern interferometric GW detectors. Knowledge of calibration to such certainties shall(More)
We have developed advanced seismic attenuation systems for Gravitational Wave (GW) detectors. The design consists of an Inverted Pendulum (IP) holding stages of Geometrical Anti-Spring Filters (GASF) and pendula, which isolate the test mass suspension from ground noise. The ultra-low-frequency IP suppresses the horizontal seismic noise, while the GASF(More)
Interferometric gravitational wave detectors operate with high optical power in their arms in order to achieve high shot-noise limited strain sensitivity. A significant limitation to increasing the optical power is the phenomenon of three-mode parametric instabilities, in which the laser field in the arm cavities is scattered into higher-order optical modes(More)
We report on an all-sky search with the LIGO detectors for periodic gravitational waves in the frequency range 50-1100 Hz and with the frequency's time derivative in the range -5 x 10{-9}-0 Hz s{-1}. Data from the first eight months of the fifth LIGO science run (S5) have been used in this search, which is based on a semicoherent method (PowerFlux) of(More)
We provide a comprehensive multi-aspect study of the performance of a pipeline used by the LIGO-Virgo Collaboration for estimating parameters of gravitational-wave bursts. We add simulated signals with four different morphologies (sine-Gaussians (SGs), Gaussians, white-noise bursts, and binary black hole signals) to simulated noise samples representing(More)
We present two general methods, the so-called Locust and the generalized Hough algorithm, to search for narrow-band signals of moderate frequency evolution and limited duration in datastreams of gravitational wave detectors. Some models of long gamma ray bursts (e.g. van Putten, 2004) predict narrow-band gravitational wave burst signals of limited duration(More)
D. V. Martynov,7 V. V. Frolov,3 S. Kandhasamy,16 K. Izumi,5 H. Miao,32 N. Mavalvala,7 E. D. Hall,1 R. Lanza,7 B. P. Abbott,1 R. Abbott,1 T. D. Abbott,2 C. Adams,3 R. X. Adhikari,1 S. B. Anderson,1 A. Ananyeva,1 S. Appert,1 K. Arai,1 S. M. Aston,3 S. W. Ballmer,4 D. Barker,5 B. Barr,6 L. Barsotti,7 J. Bartlett,5 I. Bartos,8 J. C. Batch,5 A. S. Bell,6 J.(More)