Read Books Online and Download eBooks, EPub, PDF, Mobi, Kindle, Text Full Free.
Searching For Gravitational Waves From Compact Binary Coalescences While Dealing With Challenges Of Real Data And Simulated Waveforms
Download Searching For Gravitational Waves From Compact Binary Coalescences While Dealing With Challenges Of Real Data And Simulated Waveforms full books in PDF, epub, and Kindle. Read online Searching For Gravitational Waves From Compact Binary Coalescences While Dealing With Challenges Of Real Data And Simulated Waveforms ebook anywhere anytime directly on your device. Fast Download speed and no annoying ads. We cannot guarantee that every ebooks is available!
Book Synopsis Searching for Gravitational-waves from Compact Binary Coalescences While Dealing with Challenges of Real Data and Simulated Waveforms by : Waduthanthree Thilina Dayanga
Download or read book Searching for Gravitational-waves from Compact Binary Coalescences While Dealing with Challenges of Real Data and Simulated Waveforms written by Waduthanthree Thilina Dayanga and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Estimating GW background play critical role in data analysis. We are still exploring the best way to estimate background of a CBC GW search when one or more signal present in data. In this thesis we try to address this to certain extend through NINJA-2 mock data challenge. However, due to limitations of methods and computer power, for triple coincident GW candidates we only consider loudest two interferometers for background estimation purposes.
Book Synopsis From Simulations to Signals by : Heather Kin Yee Fong
Download or read book From Simulations to Signals written by Heather Kin Yee Fong and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Detecting gravitational waves is just the start of the story; to understand their nature and the systems that emitted them, we develop methods to correctly recover signals and characterize their source properties. This thesis describes three topics in Advanced LIGO gravitational-wave data analysis, each addressing technical challenges in order to improve the detection and measurement of gravitational-wave signals from compact binary coalescences. In the first project, I present a set of numerical relativity simulations that track the coalescences of binary black holes. I describe the methods by which the simulations were performed, as well as the techniques used to evaluate their gravitational waveforms. A comprehensive error analysis concludes that the minimum overlap of numerical relativity waveforms is 99.97%. My second project improves one of Advanced LIGO's detection pipelines by deriving a source-dependent likelihood-ratio ranking statistic to rank incoming compact binary coalescence signals. Results show that using a source-dependent ranking statistic improves the pipeline's sensitive volume-time -- and therefore, its sensitivity -- for binary neutron stars detections by 6-16%. In my final project, I determine the detectability of precessing compact binaries, deriving an analytic model and then estimating quantitatively the fraction of detected events where precession is measurable by gravitational-wave detectors. My model is consistent with the lack of detectable precession from currently observed signals and indicates, in particular, that GW170817 was not emitted by a strongly precessing system.
Book Synopsis Extracting Physics from Gravitational Waves by : Tjonnie G. F. Li
Download or read book Extracting Physics from Gravitational Waves written by Tjonnie G. F. Li and published by Springer. This book was released on 2015-07-03 with total page 243 pages. Available in PDF, EPUB and Kindle. Book excerpt: Tjonnie Li's thesis covers two applications of Gravitational Wave astronomy: tests of General Relativity in the strong-field regime and cosmological measurements. The first part of the thesis focuses on the so-called TIGER, i.e. Test Infrastructure for General Relativity, an innovative Bayesian framework for performing hypothesis tests of modified gravity using ground-based GW data. After developing the framework, Li simulates a variety of General Relativity deviations and demonstrates the ability of the aforementioned TIGER to measure them. The advantages of the method are nicely shown and compared to other, less generic methods. Given the extraordinary implications that would result from any measured deviation from General Relativity, it is extremely important that a rigorous statistical approach for supporting these results would be in place before the first Gravitational Wave detections begin. In developing TIGER, Tjonnie Li shows a large amount of creativity and originality, and his contribution is an important step in the direction of a possible discovery of a deviation (if any) from General Relativity. In another section, Li's thesis deals with cosmology, describing an exploratory study where the possibility of cosmological parameters measurement through gravitational wave compact binary coalescence signals associated with electromagnetic counterparts is evaluated. In particular, the study explores the capabilities of the future Einstein Telescope observatory. Although of very long term-only applicability, this is again a thorough investigation, nicely put in the context of the current and the future observational cosmology.
Book Synopsis Searching for Gravitational Waves from Compact Binary Coalescence Using LIGO and Virgo Data by : Collin D. Capano
Download or read book Searching for Gravitational Waves from Compact Binary Coalescence Using LIGO and Virgo Data written by Collin D. Capano and published by . This book was released on 2011 with total page 297 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Globular Cluster Binaries and Gravitational Wave Parameter Estimation by : Carl-Johan Haster
Download or read book Globular Cluster Binaries and Gravitational Wave Parameter Estimation written by Carl-Johan Haster and published by Springer. This book was released on 2017-07-27 with total page 101 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis presents valuable contributions to several aspects of the rapidly growing field of gravitational wave astrophysics. The potential sources of gravitational waves in globular clusters are analyzed using sophisticated dynamics simulations involving intermediate mass black holes and including, for the first time, high-order post-Newtonian corrections to the equations of motion. The thesis further demonstrates our ability to accurately measure the parameters of the sources involved in intermediate-mass-ratio inspirals of stellar-mass compact objects into hundred-solar-mass black holes. Lastly, it proposes new techniques for the computationally efficient inference on gravitational waves. On 14 September 2015, the LIGO observatory reported the first direct detection of gravitational waves from the merger of a pair of black holes. For a brief fraction of a second, the power emitted by this merger exceeded the combined output of all stars in the visible universe. This has since been followed by another confirmed detection and a third candidate binary black hole merger. These detections heralded the birth of an exciting new field: gravitational-wave astrophysics.
Book Synopsis Analysis of Gravitational-Wave Data by : Piotr Jaranowski
Download or read book Analysis of Gravitational-Wave Data written by Piotr Jaranowski and published by Cambridge University Press. This book was released on 2009-08-27 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt: Introducing gravitational-wave data analysis, this book is an ideal starting point for researchers entering the field, and researchers currently analyzing data. Detailed derivations of the basic formulae enable readers to apply general statistical concepts to the analysis of gravitational-wave signals. It also discusses new ideas on devising the efficient algorithms.
Book Synopsis Searches for Gravitational Waves from Binary Black Hole Coalescences with Ground-based Laser Interferometer Across a Wide Parameter Space by : Satyanarayan Ray Pitambar Mohapatra
Download or read book Searches for Gravitational Waves from Binary Black Hole Coalescences with Ground-based Laser Interferometer Across a Wide Parameter Space written by Satyanarayan Ray Pitambar Mohapatra and published by . This book was released on 2012 with total page 271 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is an exciting time for Gravitational Wave (GW) theory and observations. From a theoretical standpoint, the grand-challenge problem of the full evolution of a Binary Black Hole (BBH) system has been solved numerically, and a variety of source simulations are made available steadfastly. On the observational side, the first generation of state-of-the-art GW detectors, LIGO and Virgo, have achieved their design goal, collected data and provided astrophysically meaningful limits. The second generation of detectors are expected to start running by 2015. Inspired by this zeitgeist, this thesis focuses on the detection of potential GW signatures from the coalescence of BBH in ground-based laser interferometers. The LIGO Scientific Collaboration has implemented different algorithms to search for transient GW signatures, targeting different portions of the BBH coalescence waveform. This thesis has used the existing algorithms to study the detection potential of GW from colliding BBH in LIGO in a wide range of source parameters, such as mass and spin of the black holes, using a sample of data from the last two months of the S5 LIGO science run (14 Aug 2007 to 30 Sept 2007). This thesis also uses numerical relativity waveforms made available via the Numerical INJection Analysis project (NINJA). Methods such as the Chirplet based analysis and the use of multivariate classifiers to optimize burst search algorithms have been introduced in this thesis. These performance studies over a wide parameter space were designed to optimize the discovery potential of ground-based GW detectors and defining strategies for the search of BBH signatures in advanced LIGO data, as a step towards the realization of GW astronomy.
Book Synopsis Gravitational Waves: A New Window to the Universe by : Rosalba Perna
Download or read book Gravitational Waves: A New Window to the Universe written by Rosalba Perna and published by Frontiers Media SA. This book was released on 2021-07-02 with total page 73 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Gravitational Waves and Short Gamma Ray Bursts by : Valeriu Predoi
Download or read book Gravitational Waves and Short Gamma Ray Bursts written by Valeriu Predoi and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Short hard gamma-ray bursts (GRB) are believed to be produced by compact binary coalescences (CBC) { either double neutron stars or neutron star{black hole binaries. The same source is expected to emit strong gravitational radiation, detectable with existing and planned gravitational wave observatories. The focus of this work is to describe a series of searches for gravitational waves (GW) from compact binary coalescence (CBC) events triggered by short gamma-ray burst detections. Specifically, we will present the motivation, frameworks, implementations and results of searches for GW associated with short gamma-ray bursts detected by Swift, Fermi{GBM and the InterPlanetary Network (IPN) gamma-ray detectors. We will begin by presenting the main concepts that lay the foundation of gravitational waves emission, as they are formulated in the theory of General Relativity; we will also brie y describe the operational principles of GW detectors, together with explaining the main challenges that the GW detection process is faced with. Further, we will motivate the use of observations in the electromagnetic (EM) band as triggers for GW searches, with an emphasis on possible EM signals from CBC events. We will briefly present the data analysis techniques including concepts as matched{filtering through a collection of theoretical GW waveforms, signal{to{ noise ratio, coincident and coherent analysis approaches, signal{based veto tests and detection candidates' ranking. We will use two different GW{GRB search examples to illustrate the use of the existing coincident and coherent analysis methods. We will also present a series of techniques meant to improve the sensitivity of existing GW triggered searches. These include shifting background data in time in order to obtain extended coincident data and setting a prior on the GRB inclination angle, in accordance with astrophysical observations, in order to restrict the searched parameter space. We will describe the GW data analysis and present results from a GW search around 12 short gamma-ray bursts detected by the InterPlanetary Network (IPN) between 2006 and 2007. The IPN{detected bursts usually have extended localization error boxes and a search for GW was performed at different sky locations across these error regions. Since no GW detection was made, we set upper limits on the distances to the GRB progenitors; we briefly discuss the implications that two IPN GRBs error regions overlap two nearby galaxies.
Book Synopsis Gravitational Wave Data Analysis by : B.F. Schutz
Download or read book Gravitational Wave Data Analysis written by B.F. Schutz and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 321 pages. Available in PDF, EPUB and Kindle. Book excerpt: The articles in this book represent the major contributions at the NATO Advanced Research Workshop that was held from 6 to 9 July 1987 in the magnificent setting of Dyffryn House and Gardens, in St. Nicholas, just outside Cardiff, Wales. The idea for such a meeting arose in discussions that I had in 1985 and 1986 with many of the principal members of the various groups building prototype laser-interferometric gravitational wave detectors. It became clear that the proposals that these groups were planning to submit for large-scale detectors would have to address questions like the following: • What computing hardware might be required to sift through data corning in at rates of several gigabytes per day for gravitational wave events that might last only a second or less and occur as rarely as once a month? • What software would be required for this task, and how much effort would be required to write it? • Given that every group accepted that a worldwide network of detectors operating in co incidence with one another was required in order to provide both convincing evidence of detections of gravitational waves and sufficient information to determine the amplitude and direction of the waves that had been detected, what sort of problems would the necessary data exchanges raise? Yet most of the effort in these groups had, quite naturally, been concentrated on the detector systems.
Book Synopsis Optimal Template Placement for Searches of Gravitational Waves from Precessing Compact Binary Coalescences by : Nathaniel Indik
Download or read book Optimal Template Placement for Searches of Gravitational Waves from Precessing Compact Binary Coalescences written by Nathaniel Indik and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Extracting Physics from Gravitational Waves by : Tjonnie G. F. Li
Download or read book Extracting Physics from Gravitational Waves written by Tjonnie G. F. Li and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Tjonnie Li's thesis covers two applications of Gravitational Wave astronomy: tests of General Relativity in the strong-field regime and cosmological measurements. The first part of the thesis focuses on the so-called TIGER, i.e. Test Infrastructure for General Relativity, an innovative Bayesian framework for performing hypothesis tests of modified gravity using ground-based GW data. After developing the framework, Li simulates a variety of General Relativity deviations and demonstrates the ability of the aforementioned TIGER to measure them. The advantages of the method are nicely shown and compared to other, less generic methods. Given the extraordinary implications that would result from any measured deviation from General Relativity, it is extremely important that a rigorous statistical approach for supporting these results would be in place before the first Gravitational Wave detections begin. In developing TIGER, Tjonnie Li shows a large amount of creativity and originality, and his contribution is an important step in the direction of a possible discovery of a deviation (if any) from General Relativity. In another section, Li's thesis deals with cosmology, describing an exploratory study where the possibility of cosmological parameters measurement through gravitational wave compact binary coalescence signals associated with electromagnetic counterparts is evaluated. In particular, the study explores the capabilities of the future Einstein Telescope observatory. Although of very long term-only applicability, this is again a thorough investigation, nicely put in the context of the current and the future observational cosmology. The author is the winner of the 2013 Stefano Braccini Thesis Prize awarded by the Gravitational Wave International Committee.
Book Synopsis Detection of Gravitational Waves by : Xingjiang Zhu
Download or read book Detection of Gravitational Waves written by Xingjiang Zhu and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The existence of gravitational waves was first predicted by Einstein's general theory of relativity a century ago. However gravitational waves have not yet been directly detected1. Their direct detection will open a new observational window allowing one to listen to the Universe for the first time. Einstein's gravitational spectrum spans from extremely low frequencies, with wave periods comparable to the age of the Universe, to the audio band, with frequencies roughly between 10 Hz and several kilohertz. The subject of this thesis is the direct detection of gravitational waves in two different frequency bands: a) the audio band observed by terrestrial laser interferometers; b) the nanohertz band surveyed by pulsar timing arrays. Ground-based interferometers, such as the Laser Interferometer Gravitational-wave Observatory (LIGO), are primarily searching for signals from binary coalescences of neutron stars and black holes. As the two objects orbit around each other, they lose energy through the emission of gravitational waves. As the orbital period decreases, the gravitational wave frequency and amplitude increase until the binary merges, emitting copious amounts of gravitational waves. Advanced LIGO detectors, which came online in September 2015, are expected to detect tens of such events each year after they reach design sensitivity in around 2019.In addition to those individually detectable events, a gravitational wave background exists as a result of the combined emission of numerous sources throughout the Universe. This provides another promising target for advanced detectors. Modelling such a background signal and predicting its detection prospects is the subject of the first part of this thesis. We present a comprehensive study on the gravitational wave background from compact binary coalescences throughout the Universe. It improves on previous work by using observation-based source distributions and realistic gravitational waveforms. We show that advanced detectors are likely to detect this signal assuming a realistic coalescence rate. We also investigate if subtracting the contribution of individually detectable events can potentially unmask the highly sought primordial signals.Pulsar timing arrays target gravitational waves at the lower nanohertz band. This is achieved through performing long-term radio timing observations of a spatial array of millisecond pulsars. In the second part of this thesis we focus on detection and sky localization of single sources by pulsar timing arrays, in particular signals expected from individual supermassive binary black holes. We have developed two independent coherent methods for this purpose. The first technique is fast and robust, which is adapted from network analysis methods used by ground-based detectors. We demonstrate its effectiveness for three types of sources: circular binaries, eccentric binaries and bursts. To test its robustness, we apply it to realistic synthetic data sets that include effects such as uneven sampling, heterogeneous data spans and measurement precision. With the second technique, we perform an all-sky search for continuous waves in the recent Parkes Pulsar Timing Array data set. Although no statistically significant signals were detected, the quality of the data allows us to set the best limit on the gravitational wave amplitude in the nanohertz regime. With this data set we could detect gravitational waves from supermassive binary black holes with masses higher than one billion solar mass out to a luminosity distance of about 100 Mpc.1Note added - It was announced on 11 February 2016 that a signal from the coalescence of two black holes was detected by two LIGO detectors on 14 September 2015 (Abbott et al. 2016).
Book Synopsis Overview Of Gravitational Waves, An: Theory, Sources And Detection by : Gerard Auger
Download or read book Overview Of Gravitational Waves, An: Theory, Sources And Detection written by Gerard Auger and published by World Scientific. This book was released on 2017-02-15 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes detection techniques used to search for and analyze gravitational waves (GW). It covers the whole domain of GW science, starting from the theory and ending with the experimental techniques (both present and future) used to detect them.The theoretical sections of the book address the theory of general relativity and of GW, followed by the theory of GW detection. The various sources of GW are described as well as the methods used to analyse them and to extract their physical parameters. It includes an analysis of the consequences of GW observations in terms of astrophysics as well as a description of the different detectors that exist and that are planned for the future.With the recent announcement of GW detection and the first results from LISA Pathfinder, this book will allow non-specialists to understand the present status of the field and the future of gravitational wave science.
Book Synopsis Handbook of Gravitational Wave Astronomy by : Cosimo Bambi
Download or read book Handbook of Gravitational Wave Astronomy written by Cosimo Bambi and published by Springer Nature. This book was released on 2022-07-02 with total page 1895 pages. Available in PDF, EPUB and Kindle. Book excerpt: This handbook provides an updated comprehensive description of gravitational wave astronomy. In the first part, it reviews gravitational wave experiments, from ground and space based laser interferometers to pulsar timing arrays and indirect detection from the cosmic microwave background. In the second part, it discusses a number of astrophysical and cosmological gravitational wave sources, including black holes, neutron stars, possible more exotic objects, and sources in the early Universe. The third part of the book reviews the methods to calculate gravitational waveforms. The fourth and last part of the book covers techniques employed in gravitational wave astronomy data analysis. This book represents both a valuable resource for graduate students and an important reference for researchers in gravitational wave astronomy.
Book Synopsis Topics in the Detection of Gravitational Waves from Compact Binary Inspirals by : Shasvath Jagat Kapadia
Download or read book Topics in the Detection of Gravitational Waves from Compact Binary Inspirals written by Shasvath Jagat Kapadia and published by . This book was released on 2016 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt: Orbiting compact binaries - such as binary black holes, binary neutron stars and neutron star-black hole binaries - are among the most promising sources of gravitational waves observable by ground-based interferometric detectors. Despite numerous sophisticated engineering techniques, the gravitational wave signals will be buried deep within noise generated by various instrumental and environmental processes, and need to be extracted via a signal processing technique referred to as matched filtering. Matched filtering requires large banks of signal templates that are faithful representations of the true gravitational waveforms produced by astrophysical binaries. The accurate and efficient production of templates is thus crucial to the success of signal processing and data analysis. To that end, the dissertation presents a numerical technique that calibrates existing analytical (Post-Newtonian) waveforms, which are relatively inexpensive, to more accurate fiducial waveforms that are computationally expensive to generate. The resulting waveform family is significantly more accurate than the analytical waveforms, without incurring additional computational costs of production. Certain kinds of transient background noise artefacts, called "glitches", can masquerade as gravitational wave signals for short durations and throw-off the matched-filter algorithm. Identifying glitches from true gravitational wave signals is a highly non-trivial exercise in data analysis which has been attempted with varying degrees of success. We present here a machine-learning based approach that exploits the various attributes of glitches and signals within detector data to provide a classification scheme that is a significant improvement over previous methods. The dissertation concludes by investigating the possibility of detecting a non-linear DC imprint, called the Christodoulou memory, produced in the arms of ground-based interferometers by the recently detected gravitational waves. The memory, which is even smaller in amplitude than the primary (detected) gravitational waves, will almost certainly not be seen in the current detection event. Nevertheless, future space-based detectors will likely be sensitive enough to observe the memory.
Book Synopsis Gravitational Waves from Coalescing Binaries by : Stanislav Babak
Download or read book Gravitational Waves from Coalescing Binaries written by Stanislav Babak and published by Morgan & Claypool Publishers. This book was released on 2020-04-21 with total page 117 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is to help post-graduate students to get into gravitational wave astronomy. We assume the knowledge of General Relativity theory, though we will concentrate on the physics and often omit mathematically strict derivations. We provide references to already existing literature where possible, this helps us to see a broad picture, skipping the details. The uniqueness of this book is in that it covers three frequency bands and three major world-wide efforts to detect gravitational waves. The LIGO and Virgo scientific collaboration has detected first gravitational waves and the merger of black holes become now almost a routine. We do expect many discoveries yet to come, especially in the joined gravitational and electromagnetic observations. LISA, the space-based gravitational wave observatory, will be launched around 2034 and will be able to detect thousands of GW sources in the milli-Hz band. Pulsar timing array observations have accumulated 20-years' worth of data and we expected detection of GWs in the nano-Hz band within the next decade. We describe the gravitational wave sources and data analysis techniques in each frequency band.
