Physical Sciences and Mathematics Commons^™

Topics In Gravitational-Wave Astrophysics, Prayush Kumar

Dissertations - ALL

In this dissertation we study the applicability of different waveform models in

gravitational wave searches for comparable mass binary black holes. We determine

the domain of applicability of the computationally inexpensive closed form models,

and the same for the semi-analytic models that have been calibrated to Numerical

Relativity simulations (and are computationally more expensive). We further explore

the option of using hybrid waveforms, constructed by numerically stitching analytic

and numerical waveforms, as filters in gravitational wave detection searches. Beyond

matched-filtering, there is extensive processing of the filter output before a detection

candidate can be confirmed. We utilize recent results from …

Detection Of Gravitational Wave Signals From Ns-Ns Inspirals In Presence Of Non-Stationary Noise, Wenhui Wang

Theses and Dissertations - UTB/UTPA

Gravitational Wave (GW) detection is an important and inspiring project. Once detected, it will open a new window to understand the universe. The laser interferometer GW detectors, specially LIGO, is the most sensitive detectors at the moment, which can detect GW signal as weak as 10−21. Chirp signal generated by neutron star binaries is a well modeled waveform. One goal of LIGO is to study chirp signal detection. In this field, matched filtering is a widely used method. But since LIGO noise is non-stationary, which will weaken the efficiency of general matched filtering. In this work, a modified matched filtering …

Dawn Of Gravitational Wave Astronomy, Maria Babiuc-Hamilton

Physics Faculty Research

This presentation chronicles the discovery of gravity waves.

The Ninja-2 Project: Detecting And Characterizing Gravitational Waveforms Modelled Using Numerical Binary Black Hole Simulations, J. Aasi, B. P. Abbott, R. Abbott, T. Abbott, M. R. Abernathy, T. Accadia, F. Acernese, Marc Favata, Shaon Ghosh, Rodica Martin

Department of Physics and Astronomy Faculty Scholarship and Creative Works

The Numerical INJection Analysis (NINJA) project is a collaborative effort between members of the numerical relativity and gravitational-wave (GW) astrophysics communities. The purpose of NINJA is to study the ability to detect GWs emitted from merging binary black holes (BBH) and recover their parameters with next-generation GW observatories. We report here on the results of the second NINJA project, NINJA-2, which employs 60 complete BBH hybrid waveforms consisting of a numerical portion modelling the late inspiral, merger, and ringdown stitched to a post-Newtonian portion modelling the early inspiral. In a 'blind injection challenge' similar to that conducted in recent Laser …

Introduction To Ligo And An Experiment Regarding The Quality Factor Of Crystalline Silicon, Edward Taylor

Physics

Third generation LIGO detectors will be limited by thermal noise at a low frequency band where gravitational wave signals are expected to exist. A large contribution to thermal noise is caused by internal friction of the mirror and suspension elements. In order to meet the quantum mechanical sensitivity limits of the detector, it will be necessary to further push down the contribution of thermal noise. Future detectors will require new materials with extremely high mechanical quality. Silicon at cryogenic temperatures shows the promise to provide the required mechanical quality due to its vanishing expansion coefficient at 120 K. The fluctuation …

Performance Characterization Of The Dual-Recycled Michelson Subsystem In Advanced Ligo, Anamaria Effler

LSU Doctoral Dissertations

General relativity predicts the existence of gravitational waves as ripples in spacetime propagating at the speed of light. They couple to matter weakly, which implies only cataclysmic cosmic events generating such waves can be detected. Binary neutron star coalescences are, for example, one of the most promising detectable source. Their weak coupling also implies that very sensitive instruments are needed to detect them, and the most sensitive so far have been laser interferometers with km-scale arms. The Laser Interferometric Gravitational wave Observatory (LIGO) is exactly such an instrument, and the most sensitive in the world to the date of this …