彩民宝典

Banner image: A pulsar ejecting a plume of energy. (Credit:听NASA/HST/ASU/J. Hester et al.)

Scientists have used a 鈥済alaxy-sized鈥� space observatory to find possible hints of a unique signal from gravitational waves, or the powerful ripples that course through the universe and warp the fabric of space and time itself.听

The new findings, , hail from a U.S. and Canadian project called the (狈础狈翱骋谤补惫).听

For over 13 years, NANOGrav researchers have pored over the light streaming from dozens of pulsars spread throughout the Milky Way Galaxy to try to detect a 鈥済ravitational wave background.鈥� That鈥檚 what scientists call the steady flux of gravitational radiation that, according to theory, washes over Earth on a constant basis. The team hasn鈥檛 yet pinpointed that target, but it鈥檚 getting closer than ever before, said Joseph Simon, an astrophysicist at the 彩民宝典 and lead author of the new paper.听

鈥淲e鈥檝e found a strong signal in our dataset,鈥� said Simon, a postdoctoral researcher in the Department of Astrophysical and Planetary Sciences. 鈥淏ut we can鈥檛 say yet that this is the gravitational wave background.鈥�

In 2017, scientists on an experiment called the (LIGO) won the Nobel Prize in Physics for the first-ever direct detection of gravitational waves. Those waves were created when two black holes slammed into each other roughly 130 million lightyears from Earth, generating a cosmic shock that spread to our own solar system.听

That event was the equivalent of a cymbal crash鈥攁 violent and short-lived blast. The gravitational waves that Simon and his colleagues are looking for, in contrast, are more like the steady hum of conversation at a crowded cocktail party.

Detecting that background noise would be a major scientific achievement, opening a new window to the workings of the universe, he added. These waves, for example, could give scientists new tools for studying how the supermassive black holes at the centers of many galaxies merge over time.

鈥淭hese enticing first hints of a gravitational wave background suggest that supermassive black holes likely do merge and that we are bobbing in a sea of gravitational waves rippling from supermassive black hole mergers in galaxies across the universe,鈥� said Julie Comerford, an associate professor of astrophysical and planetary science at 彩民宝典 and NANOGrav team member.听

Simon will present his team鈥檚 results at a on Monday at the .听

Galactic lighthouses

Through their work on NANOGrav, Simon and Comerford are part of a high stakes, albeit collaborative, international race to find the gravitational wave background. Their project joins two others out of Europe and Australia to make up a network called the .听

Simon said that, at least according to theory, merging galaxies and other cosmological events produce a steady churn of gravitational waves. They鈥檙e humungous鈥攁 single wave, Simon said, can take years or even longer to pass Earth by. For that reason, no other existing experiments can detect them directly.听

鈥淥ther observatories search for gravitational waves that are on the order of seconds,鈥� Simon said. 鈥淲e鈥檙e looking for waves that are on the order of years or decades.鈥�

He and his colleagues had to get creative. The NANOGrav team uses telescopes on the ground not to look for gravitational waves but to observe pulsars. These collapsed stars are the lighthouses of the galaxy. They spin at incredibly fast speeds, sending streams of radiation hurtling toward Earth in a blinking pattern that remains mostly unchanged over the eons.听

Simon explained that gravitational waves alter the steady pattern of light coming from pulsars, tugging or squeezing the relative distances that these rays travel through space. Scientists, in other words, might be able to spot the gravitational wave background simply by monitoring pulsars for correlated changes in the timing of when they arrive at Earth.

鈥淭hese pulsars are spinning about as fast as your kitchen blender,鈥� he said. 鈥淎nd we鈥檙e looking at deviations in their timing of just a few hundred nanoseconds.鈥�

Something there

To find that subtle signal, the NANOGrav team strives to observe as many pulsars as possible for as long as possible. To date, the group has observed 45 pulsars for at least three years and, in some cases, for well over a decade.

The hard work seems to be paying off. In their latest study, Simon and his colleagues report that they鈥檝e detected a distinct signal in their data: Some common process seems to be affecting the light coming from many of the pulsars.

鈥淲e walked through each of the pulsars one by one. I think we were all expecting to find a few that were the screwy ones throwing off our data,鈥� Simon said. 鈥淏ut then we got through them all, and we said, 鈥極h my God, there鈥檚 actually something here.鈥欌��

The researchers still can鈥檛 say for sure what鈥檚 causing that signal. They鈥檒l need to add more pulsars to their dataset and observe them for longer periods to determine if it鈥檚 actually the gravitational wave background at work.听

鈥淏eing able to detect the gravitational wave background will be a huge step but that鈥檚 really only step one,鈥� he said. 鈥淪tep two is pinpointing what causes those waves and discovering what they can tell us about the universe.鈥�

NANOGrav is a U.S. National Science Foundation Physics Frontiers Center. It is co-directed by Maura McLaughlin of West Virginia University and Xavier Siemens of Oregon State University.