New Research Enlightens us on Invisible Gravitational Waves Distorting Space-Time

Using radio pulsars, West Virginia University’s Emmanuel Fonseca is pioneering the detection of gravitational waves, with aim to reveal insights into neutron stars and the fabric of the cosmos. His work, backed by substantial National Science Foundation funding, fuses traditional astronomy with advanced technologies.

Emmanuel Fonseca (a researcher at West Virginia University’s Center for Gravitational Waves and Cosmology), is presenting an invisible universe of gravitational radiation distorting the spacetime continuum. Emmanuel Fonseca is an assistant professor of astronomy at the WVU Eberly College of Arts and Sciences, who uses precisely timed signals from stars called “radio pulsars” to detect gravitational waves. These waves, generated when colossal objects like black holes or stars pick up speed, contain info about phenomena and objects in faraway galaxies and could disclose how matter behaves inside neutron stars. The study is backed by a $416,000 grant from the National Science Foundation.

Breakthroughs in Gravitational Wave Research

“Gravitational waves permeate everything — the solar system, Earth, us — but only in the past five to eight years have we been able to detect them,” said Fonseca. “They’re a unique window into the universe, distinct from electromagnetic radiation like light, X-rays, ultraviolet. Those forms of radiation are generated by charged particles, while gravitational waves are caused by objects accelerating in space and perturbing space-time.”

According to Fonseca, “all the supermassive black holes in binary systems in the universe are throwing waves at us. The sum impact of those signals is a wobbly, seemingly random pattern called ‘gravitational-wave background.” “As this research improves our sensitivity to that background, we’ll become more sensitive to gravitational waves emanating from galaxies nearby. Once we’ve found local sources of gravitational waves, we can point electromagnetic telescopes toward them and begin to make sense of things, and that will really be fun.”

Pioneering Detection Techniques

Einstein theorized gravitational waves way back in 1916, but only last spring did the international research collaboration NANOGrav announce unambiguous evidence of their presence. “NANOGrav is a team of researchers, including myself, who have been using data from the Green Bank Telescope in Pocahontas County to detect gravitational waves,” said Fonseca. “For years, we worked so hard to find evidence of gravitational waves. Now suddenly we’re not just detecting them but making sense of them.”

Integrating Data for Enhanced Detection

The study will combine Green Bank data with data from the CHIME radio telescope in Canada, which Fonseca helped build. The observatories record similar info at different intervals and frequencies. “Combining the data means we can achieve full coverage of each wave. We can ‘see’ from one trough, over the peak, and down to the next trough,” Fonseca said.

Gravitational waves can stretch across galaxies. They exist in the low-frequency spectrum, therefore a year or two could elapse between a radio telescope registering the first peak of a gravitational wave and the second. As the waves oscillate, they ripple the universe, slightly dislodging in time and space whatever they encounter.