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Author Topic:   Universal background of gravitational waves
Robert Pearlman
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Posts: 50680
From: Houston, TX
Registered: Nov 1999

posted 06-28-2023 08:39 PM     Click Here to See the Profile for Robert Pearlman   Click Here to Email Robert Pearlman     Edit/Delete Message   Reply w/Quote
NASA release
15 Years of Radio Data Reveals Evidence of Space-Time Murmur

Scientists have found evidence of a universal background of gravitational waves, or ripples in the fabric of space-time.

Above: Artist's concept of a collection of pulsars that detect gravitational waves from pairs of orbiting supermassive black holes. (Aurore Simonnet/NANOGrav Collaboration)

The motion of black holes and other massive objects through space can create ripples in the fabric of the universe, called gravitational waves. On June 28 scientists announced the first evidence of a background of long-wavelength gravitational waves that fills the cosmos. These waves are thought to have been created over eons by supermassive black holes, up to billions of times the mass of our Sun, circling each other before they merge. Detecting the gravitational wave background is analogous to hearing the hum of a large group of people talking at a party, without distinguishing any particular voice.

The background ripples detected by NANOGrav could help scientists better understand how gravitational waves are created and what happens to them as they propagate through the universe. They could also be used to study supermassive black hole mergers, events that can last for millions of years. Scientists think these mergers happen in most galaxies and influence their evolution.

The North American Nanohertz Observatory for Gravitational Waves (NANOGrav) presented the evidence in a series of papers published in the Astrophysical Journal Letters. NANOGrav is a National Science Foundation-funded Physics Frontiers Center of more than 190 scientists from the United States and Canada, including scientists at NASA's Jet Propulsion Laboratory in Southern California and other NASA centers. The collaboration has spent more than 15 years collecting high-precision data from ground-based radio telescopes, looking for these gravitational waves.

The discovery complements the first-ever detection of gravitational waves in 2015 by LIGO, the Laser Interferometer Gravitational Observatory. Those signals, at a much shorter wavelength than the new discovery, were from black holes about 30 times the mass of our Sun.

NASA is contributing to the ESA (European Space Agency)-led Laser Interferometer Space Antenna mission, a future space-based observatory that will detect gravitational waves that are in a wavelength range between those detected by NANOGrav and LIGO.

The National Science Foundation will host a live presentation about the results at 1 p.m. Eastern (1700 GMT) on Thursday (June 29).

Jonnyed
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Posts: 600
From: Dumfries, VA, USA
Registered: Aug 2014

posted 06-29-2023 05:57 PM     Click Here to See the Profile for Jonnyed   Click Here to Email Jonnyed     Edit/Delete Message   Reply w/Quote
It would be interesting to learn more about the behavior of light (and the speed of light) when traveling through these massive gravitational waves in the Universe — and frankly how does gravity bend light when light has no mass?

Kinda warps the mind of us Newtonians.

lspooz
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Posts: 463
From: Greensboro, NC USA
Registered: Aug 2012

posted 06-29-2023 08:03 PM     Click Here to See the Profile for lspooz   Click Here to Email lspooz     Edit/Delete Message   Reply w/Quote
Mass bends space and so alters the path of light.

Jonnyed
Member

Posts: 600
From: Dumfries, VA, USA
Registered: Aug 2014

posted 06-30-2023 06:45 PM     Click Here to See the Profile for Jonnyed   Click Here to Email Jonnyed     Edit/Delete Message   Reply w/Quote
"It just does." You took my Newtonian joke too seriously. Or maybe I shouldn't make jokes on behalf of Isaac Newton?

At any rate, these massive irregular gravitational waves in the universe are mindblowing and it is interesting to think about what it does to light travel isn't it?

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