LIGO India Project

Subject: Science and technology

Section: Space Technology

LIGO is an international network of laboratories that detect the ripples in spacetime produced by the movement of large celestial objects like stars and planets.
LIGO-India will be located in Hingoli district of Maharashtra, about 450 km east of Mumbai, and is scheduled to begin scientific runs from 2030.

LIGO (Laser Interferometer Gravitational-Wave Observatory)

It is an international network of laboratories meant to detect gravitational waves.
Under this, two large observatories (~ 3000 Km apart) were built in the US (Hanford Site, Washington and Livingston, Louisiana) with the aim of detecting gravitational waves by laser interferometry.
Interferometry is a technique which uses the interference of superimposed waves to extract information.
Besides the US, such gravitational wave observatories are currently operational in Virgo in Italy and KAGRA in Japan
LIGO-India will be the fifth, and possibly the final node of the planned network.

Why is a Fifth LIGO Observatory Needed?

Extremely low strength of gravitational waves make their detection very difficult.
Therefore, LIGO-India is part of the plan to expand the network of gravitational wave observatories in order to increase the chances of detecting these waves from anywhere in the observable universe.
This will improve the accuracy and quality of information taken from them.

Gravitational Waves

These are the ripples in space-time produced by the movement of large celestial bodies like stars and planets.
Gravitational waves provide a new way to explore the universe, especially in ‘dark’ areas where electromagnetic radiation is absent.
These were postulated over 100 years ago in Albert Einstein’s General Theory of Relativity that encapsulates the current understanding of how gravitation works.
The celestial bodies’ movements could disturb space-time, creating gravitational waves—ripples in space-time.
They were first discovered in 2015 by two LIGOs based in the United States.
In 2017, this experimental verification of the century-old theory received the Nobel Prize in Physics (to Rainer Weiss, Barry C. Barish and Kip S. Thorne).
Until now, at least 10 events producing gravitational waves have been detected.

LIGO-India’s Site and Equipment

Site Selection: Hingoli was chosen due to low seismic activity, vital for precise measurements.
Geographical Impact: Spans 430 acres, affecting six villages, boosting the local economy and infrastructure.
Equipment: Features 4-km arms with 1.2m diameters vacuum chambers and highly-reflective mirrors for accurate gravitational wave detection.
Precision Engineering: Mirrors polished to nanometer scales, vacuum chambers maintained at near-absolute vacuum for precise measurements.
Security: Strict access control maintains a controlled environment to protect sensitive experiments.

Future Prospects and Benefits

LIGO-India is poised to become a hub for international collaboration, attracting researchers from around the world to work on groundbreaking experiments.
The project’s extended operational life of 30 years ensures its enduring contribution to the scientific community.
LIGO-India is expected to generate vast amounts of data, providing valuable information for astronomy and astrophysics research.
The development of technology and infrastructure for LIGO-India, including the fabrication of key components and the establishment of a data center, can stimulate India’s technological capabilities.

Local Impact and Scientific Outreach

The project has created employment opportunities for locals, ranging from security personnel to administrative and support staff, providing a boost to the regional economy.
Teachers in the Marathwada region have witnessed a surge of interest in astronomy among students, highlighting the project’s educational impact.
The proposed science outreach center, ‘Light & Gravity’, represents a commitment to fostering scientific curiosity and knowledge in the local community.