A5068034922- Pulsars and Gravitational Waves Research
- Gamma-ray bursts and supernovae
- Geophysics and Gravity Measurements
- Cosmology and Gravitation Theories
- Astronomy and Astrophysical Research
- Astrophysical Phenomena and Observations
- Stellar, planetary, and galactic studies
- Astrophysics and Cosmic Phenomena
- Galaxies: Formation, Evolution, Phenomena
- Geophysics and Sensor Technology
- Statistical and numerical algorithms
- Seismic Waves and Analysis
- Dark Matter and Cosmic Phenomena
- Advanced Frequency and Time Standards
- Astronomical Observations and Instrumentation
- Radio Astronomy Observations and Technology
- Scientific Research and Discoveries
- Atomic and Subatomic Physics Research
- Black Holes and Theoretical Physics
- Particle Accelerators and Free-Electron Lasers
- Adaptive optics and wavefront sensing
- Seismology and Earthquake Studies
- Cold Atom Physics and Bose-Einstein Condensates
- Statistical Mechanics and Entropy
- Magnetic confinement fusion research
Argonne National Laboratory
2012-2015
University of Wisconsin–Milwaukee
2007-2013
Brownsville Public Library
2011-2013
Texas Southmost College
2012-2013
The University of Texas Rio Grande Valley
2013
Cardiff University
2011
Carleton College
2011
California Institute of Technology
2011
Andrews University
2011
Australian National University
2011
We present an up-to-date, comprehensive summary of the rates for all types compact binary coalescence sources detectable by Initial and Advanced versions ground-based gravitational-wave detectors LIGO Virgo. Astrophysical estimates compact-binary depend on a number assumptions unknown model parameters, are still uncertain. The most confident among these rate predictions coalescing neutron stars which based extrapolations from observed pulsars in our Galaxy. These yield likely 100 per Myr...
The goal of the Laser Interferometric Gravitational-Wave Observatory (LIGO) is to detect and study gravitational waves (GWs) astrophysical origin. Direct detection GWs holds promise testing general relativity in strong-field regime, providing a new probe exotic objects such as black holes neutron stars uncovering unanticipated astrophysics. LIGO, joint Caltech–MIT project supported by National Science Foundation, operates three multi-kilometer interferometers at two widely separated sites...
We report on a search for gravitational waves from coalescing compact binaries using LIGO and Virgo observations between July 7, 2009 October 20, 2010. searched signals with total mass 2 25 solar masses; this includes binary neutron stars, black holes, consisting of hole star. The detectors were sensitive to systems up 40 Mpc distant further higher systems. No gravitational-wave detected. upper limits the rate coalescence as function mass, including results previous observations. cumulative...
We present direct upper limits on gravitational wave emission from the Crab pulsar using data first 9 months of fifth science run Laser Interferometer Gravitational-wave Observatory (LIGO). These are based two searches. In we assume that follows observed radio timing, giving an limit beats indirect inferred spin-down and braking index energetics nebula. second allow for a small mismatch between signal frequencies interpret our results in context possible mechanisms.
We present upper limits on the gravitational wave emission from 78 radio pulsars based data third and fourth science runs of LIGO GEO 600 detectors. The both have been combined coherently to maximize sensitivity. For first time, within binary (or multiple) systems included in search by taking into account signal modulation due their orbits. Our are therefore measured for 56 these pulsars. remaining 22, our results improve previous up a factor 10. example, tightest limit strain is...
We analyzed the available LIGO data coincident with GRB 070201, a short-duration, hard-spectrum γ-ray burst (GRB) whose electromagnetically determined sky position is spiral arms of Andromeda galaxy (M31). Possible progenitors such short, hard GRBs include mergers neutron stars or star and black hole, soft repeater (SGR) flares. These events can be accompanied by gravitational-wave emission. No plausible candidates were found within 180 s long window around time 070201. This result implies...
We describe the implementation of a search for gravitational waves from compact binary coalescences in LIGO and Virgo data. This all-sky, all-time, multi-detector coalescence has been used to data taken recent runs. The is built around matched filter analysis data, augmented by numerous signal consistency tests designed distinguish artifacts non-Gaussian detector noise potential detections. demonstrate performance using Gaussian fifth science run that are capable mitigating effect providing...
We present direct upper limits on continuous gravitational wave emission from the Vela pulsar using data Virgo detector's second science run. These have been obtained three independent methods that assume follows radio timing. Two of produce frequentist for an assumed known orientation star's spin axis and value polarization angle of, respectively, $1.9\ee{-24}$ $2.2\ee{-24}$, with 95% confidence. The third method, under same hypothesis, produces a Bayesian limit $2.1\ee{-24}$, degree...
We present a search for gravitational waves from 116 known millisecond and young pulsars using data the fifth science run of LIGO detectors. For this search, ephemerides overlapping period were obtained all radio X-ray observations. demonstrate an updated method that allows small uncertainties in pulsar phase parameters to be included search. report no signal detection any targets therefore interpret our results as upper limits on wave strength. The most interesting are those pulsars....
We carry out two searches for periodic gravitational waves using the most sensitive few hours of data from second LIGO science run. The first search is targeted at isolated, previously unknown neutron stars and covers entire sky in frequency band 160-728.8 Hz. targets accreting star low-mass X-ray binary Scorpius X-1, bands 464-484 Hz 604-624 Hz, orbit parameters. Both look coincidences between Livingston Hanford 4-km interferometers. For isolated our 95% confidence upper limits on wave...
We report on a search for gravitational waves from the coalescence of compact binaries during third and fourth LIGO science runs. The focused generated inspiral phase binary evolution. In our analysis, we considered three categories systems, ordered by mass: (i) primordial black hole with masses in range 0.35 M(sun) < m1, m2 1.0 M(sun), (ii) neutron stars 3.0 (iii) holes M(sun)< m_(max) additional constraint m1+ m_(max), where was set to 40.0 80.0 runs, respectively. Although detectors...
We present results from a search for gravitational-wave bursts in the data collected by LIGO and Virgo detectors between July 7, 2009 October 20, 2010: are analyzed when at least two of three LIGO-Virgo coincident operation, with total observation time 207 days. The analysis searches transients duration < 1 s over frequency band 64-5000 Hz, without other assumptions on signal waveform, polarization, direction or occurrence time. All identified events consistent expected accidental...
We introduce a novel cooling technique capable of approaching the quantum ground state kilogram-scale system—an interferometric gravitational wave detector. The detectors Laser Interferometer Gravitational-wave Observatory (LIGO) operate within factor 10 standard limit (SQL), providing displacement sensitivity 10−18 m in 100 Hz band centered on 150 Hz. With new feedback strategy, we dynamically shift resonant frequency 2.7 kg pendulum mode to lie this optimal band, where its effective...
Compact binary systems with neutron stars or black holes are one of the most promising sources for ground-based gravitational wave detectors. Gravitational radiation encodes rich information about source physics; thus parameter estimation and model selection crucial analysis steps any detection candidate events. Detailed models anticipated waveforms enable inference on several parameters, such as component masses, spins, sky location distance that essential new astrophysical studies these...
We present a search for periodic gravitational waves from the neutron star in supernova remnant Cassiopeia A. The coherently analyzes data 12 day interval taken fifth science run of Laser Interferometer Gravitational-Wave Observatory. It searches gravitational-wave frequencies 100 to 300 Hz and covers wide range first second frequency derivatives appropriate age different spin-down mechanisms. No signal was detected. Within frequencies, we set 95% confidence upper limits (0.7–1.2) × 10−24 on...
We have searched for gravitational waves from coalescing low mass compact binary systems with a total between 2M⊙ and 35M⊙ minimum component of 1M⊙ using data the first year fifth science run three LIGO detectors, operating at design sensitivity. Depending on mass, we are sensitive to coalescences as far 150 Mpc Earth. No gravitational-wave signals were observed above expected background. Assuming population objects Gaussian distribution representing neutron star systems, black hole–neutron...
We present an analysis of supernova light curves simulated for the upcoming Dark Energy Survey (DES) search. The simulations employ a code suite that generates and fits realistic in order to obtain distance modulus/redshift pairs are passed cosmology fitter. investigated several different survey strategies including field selection, selection biases, photometric redshift measurements. Using results this study, we chose 30 deg2 search area griz filter set. forecast (1) will provide...
We report the results of first search for gravitational waves from compact binary coalescence using data Laser Interferometer Gravitational-Wave Observatory and Virgo detectors. Five months were collected during Observatory's S5 Virgo's VSR1 science runs. The focused on signals mergers with a total mass between 2 $35{M}_{\ensuremath{\bigodot}}$. No are identified. cumulative 90%-confidence upper limits rate calculated nonspinning neutron stars, black hole-neutron star systems, holes to be...
We present results from an all-sky search for unmodeled gravitational-wave bursts in the data collected by LIGO, GEO 600 and Virgo detectors between November 2006 October 2007. The is performed three different analysis algorithms over frequency band 50--6000 Hz. Data are analyzed times with at least two of four LIGO-Virgo coincident operation, a total live time 266 days. No events produced survive selection cuts. set frequentist upper limit on rate impinging our network detectors. When...
We present the results of a search for gravitational waves associated with 154 gamma-ray bursts (GRBs) that were detected by satellite-based experiments in 2009–2010, during sixth LIGO science run and second third Virgo runs. perform two distinct searches: modeled coalescences either neutron stars or star black hole, generic, unmodeled gravitational-wave bursts. find no evidence counterparts, any individual GRB this sample population as whole. For all GRBs we place lower bounds on distance...
We report a search for gravitational waves from the inspiral, merger and ringdown of binary black holes (BBH) with total mass between 25 100 solar masses, in data taken at LIGO Virgo observatories July 7, 2009 October 20, 2010. The maximum sensitive distance detectors over this period $(20,20){\mathrm{M}}_{\ensuremath{\bigodot}}$ coalescence was 300 Mpc. No wave signals were found. thus upper limits on astrophysical rates BBH as function component masses nonspinning components, also evaluate...
The sensitivity of searches for astrophysical transients in data from the LIGO is generally limited by presence transient, non-Gaussian noise artifacts, which occur at a high-enough rate such that accidental coincidence across multiple detectors non-negligible. Furthermore, artifacts typically dominate over background contributed stationary noise. These "glitches" can easily be confused transient gravitational-wave signals, and their robust identification removal will help any search...
The Large Synoptic Survey Telescope is designed to provide an unprecedented optical imaging dataset that will support investigations of our Solar System, Galaxy and Universe, across half the sky over ten years repeated observation. However, exactly how LSST observations be taken (the observing strategy or "cadence") not yet finalized. In this dynamically-evolving community white paper, we explore detailed performance anticipated science expected depend on small changes strategy. Using...
This paper presents results of an all-sky searches for periodic gravitational waves in the frequency range [50, 1190] Hz and with derivative ranges [-2 x 10^-9, 1.1 10^-10] Hz/s fifth LIGO science run (S5). The novelty search lies use a non-coherent technique based on Hough-transform to combine information from coherent timescales about one day. Because these are very computationally intensive, they have been deployed Einstein@Home distributed computing project infrastructure. presented here...