scholarly journals The science case for LIGO-India

2021 ◽  
Author(s):  
Mohammed Saleem ◽  
Javed Rana ◽  
V. Gayathri ◽  
Aditya Vijaykumar ◽  
Srashti Goyal ◽  
...  
Keyword(s):  
Gravitational Wave ◽  
Global Network ◽  
Duty Factor ◽  
Fundamental Physics ◽  
Detection Rates ◽  
Compact Binaries ◽  
Gravitational Wave Detectors ◽  
Multiple Detectors

Abstract The global network of gravitational-wave detectors has completed three observing runs with ∼50 detections of merging compact binaries. A third LIGO detector, with comparable astrophysical reach, is to be built in India (LIGO-Aundha) and expected to be operational during the latter part of this decade. Such additions to the network increase the number of baselines and the network SNR of GW events. These enhancements help improve the sky-localization of those events. Multiple detectors simultaneously in operation will also increase the baseline duty factor, thereby, leading to an improvement in the detection rates and, hence, the completeness of surveys. In this paper, we quantify the improvements due to the expansion of the LIGO Global Network (LGN) in the precision with which source properties will be measured. We also present examples of how this expansion will give a boost to tests of fundamental physics.

scholarly journals Terrestrial gravity fluctuations

2019 ◽  
Vol 22 (1) ◽  
Author(s):  
Jan Harms
Keyword(s):  
Gravitational Wave ◽  
Early Warning Systems ◽  
Mitigation Strategies ◽  
Noise Mitigation ◽  
Fundamental Physics ◽  
Terrestrial Gravity ◽  
Gravitational Wave Detectors ◽  
Density Perturbations ◽  
New Generation ◽  
Physics Experiments

Abstract Terrestrial gravity fluctuations are a target of scientific studies in a variety of fields within geophysics and fundamental-physics experiments involving gravity such as the observation of gravitational waves. In geophysics, these fluctuations are typically considered as signal that carries information about processes such as fault ruptures and atmospheric density perturbations. In fundamental-physics experiments, it appears as environmental noise, which needs to be avoided or mitigated. This article reviews the current state-of-the-art of modeling high-frequency terrestrial gravity fluctuations and of gravity-noise mitigation strategies. It hereby focuses on frequencies above about 50 mHz, which allows us to simplify models of atmospheric gravity perturbations (beyond Brunt–Väisälä regime) and it guarantees as well that gravitational forces on elastic media can be treated as perturbation. Extensive studies have been carried out over the past two decades to model contributions from seismic and atmospheric fields especially by the gravitational-wave community. While terrestrial gravity fluctuations above 50 mHz have not been observed conclusively yet, sensitivity of instruments for geophysical observations and of gravitational-wave detectors is improving, and we can expect first observations in the coming years. The next challenges include the design of gravity-noise mitigation systems to be implemented in current gravitational-wave detectors, and further improvement of models for future gravitational-wave detectors where terrestrial gravity noise will play a more important role. Also, many aspects of the recent proposition to use a new generation of gravity sensors to improve real-time earthquake early-warning systems still require detailed analyses.

Sub-Millisecond Absolute Timing: Toward an Actual Gravitational Observatory

1997 ◽  
Vol 12 (30) ◽  
pp. 2261-2264 ◽  
Author(s):  
M. Cerdonio ◽  
V. Crivelli Visconti ◽  
A. Ortolan ◽  
G. Prodi ◽  
L. Taffarello ◽  
...  
Keyword(s):  
Gravitational Wave ◽  
Global Network ◽  
Necessary Condition ◽  
The Future ◽  
Gravitational Wave Detectors

In this letter we report the results we obtained experimentally demonstrating the feasibility of absolute timing of impulsive gravitational wave signals by means of a resonant bar detector. We reached a resolution of less than 20 μs for SNR ≥ 10. We also discuss the important prospects this result opens for the present and for the future, as a necessary condition for the implementation of a global network of gravitational wave detectors.

ADVANCED GRAVITATIONAL WAVE DETECTORS AND THE GLOBAL NETWORK

2005 ◽  
Vol 20 (29) ◽  
pp. 7045-7053 ◽  
Author(s):  
ANDREA VICERÉ
Keyword(s):  
Gravitational Wave ◽  
Global Network ◽  
Wide Range ◽  
Gravitational Wave Detectors ◽  
Alternative Techniques ◽  
New Generation

A wide range of gravitational wave detectors is currently operating, and in a few years will reach a sensitivity enabling them to potentially detect sources tens of megaparsec away. In the next years, the instruments will be upgraded, giving birth to a new generation of improved, more sensitive detectors. Alternative techniques are also being explored which have the potential in a longer term of even better sensitivities. Such improvements are needed to turn a still elusive hunt for a first detection into a real gravitational-wave astronomy; it is the purpose of this talk to outline the path toward the design and realization of advanced detectors, and to discuss how they will be integrated into a global network.

Interferometric gravitational wave detectors

2018 ◽  
Vol 27 (07) ◽  
pp. 1840001
Author(s):  
Peter R. Saulson
Keyword(s):  
Gravitational Wave ◽  
Global Network ◽  
Clear Understanding ◽  
Current Generation ◽  
Gravitational Wave Detection ◽  
Wave Detection ◽  
Gravitational Wave Detectors

Gravitational wave detection has now entered the era in which signals are being found. It is timely, therefore, to review the current detectors and how they work. This review focuses on the dramatic arc that links the earliest clear understanding of gravitational wave detection with the current generation of detectors. I will also discuss the prospects for expansion of the global network of gravitational wave detectors, with special attention to the role of LIGO-India.

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