{"id":330360,"date":"2026-03-05T13:55:06","date_gmt":"2026-03-05T13:55:06","guid":{"rendered":"https:\/\/www.newsbeep.com\/ie\/330360\/"},"modified":"2026-03-05T13:55:06","modified_gmt":"2026-03-05T13:55:06","slug":"new-catalog-more-than-doubles-the-number-of-gravitational-wave-detections-made-by-ligo-virgo-and-kagra-observatories-mit-news","status":"publish","type":"post","link":"https:\/\/www.newsbeep.com\/ie\/330360\/","title":{"rendered":"New catalog more than doubles the number of gravitational-wave detections made by LIGO, Virgo, and KAGRA observatories | MIT News"},"content":{"rendered":"

When the densest objects in the universe collide and merge, the violence sets off ripples, in the form of gravitational waves, that reverberate across space and time, over hundreds of millions and even billions of years. By the time they pass through Earth, such cosmic ripples are barely discernible.<\/p>\n

And yet, scientists are able to detect them, thanks to a global network of gravitational-wave observatories: the U.S.-based National Science Foundation Laser Interferometer Gravitational-Wave Observatory (NSF LIGO), the Virgo interferometer in Italy, and the Kamioka Gravitational Wave Detector (KAGRA) in Japan. Together, the observatories \u201clisten\u201d for faint wobbles in the gravitational field that could have come from far-off astrophysical smash-ups.<\/p>\n

Now the LIGO-Virgo-KAGRA (LVK) Collaboration is publishing its latest compilation of gravitational-wave detections, presented<\/a> in a forthcoming special issue of Astrophysical Journal Letters. From the findings, it appears that the universe is echoing all over with a kaleidoscope of cosmic collisions.<\/p>\n

The LVK\u2019s Gravitational-Wave Transient Catalog-4.0 (GWTC-4) comprises detections of gravitational waves from a portion of the observatories\u2019 fourth and most recent observing run, which occurred between May 2023 and January 2024. During this nine-month period, the observatories detected 128 new gravitational-wave \u201ccandidates,\u201d meaning that the signals are likely from extreme, far-off astrophysical sources. (The LVK detected about 300 mergers so far in the fourth run, but not all of these appear yet in the LVK catalog.)<\/p>\n

This newest crop more than doubles the size of the gravitational-wave catalog, which previously contained 90 candidates compiled from all three previous observing runs.<\/p>\n

\u201cThe beautiful science that we are able to do with this catalog is enabled by significant improvements in the sensitivity of the gravitational-wave detectors as well as more powerful analysis techniques,\u201d says LVK member Nergis Mavalvala, who is\u00a0dean of the MIT School of Science and the Curtis and Kathleen Marble Professor of Astrophysics.<\/p>\n

\u201cIn the past decade, gravitational wave astronomy has progressed from the first detection \u00a0to the observation of hundreds of black hole mergers,\u201d says Stephen\u00a0Fairhurst, a professor at Cardiff University and LIGO Scientific Collaboration spokesperson.\u00a0\u201cThese observations enable us to better understand how black holes form from the collapse of massive stars, probe the cosmological evolution of the universe and provide increasingly rigorous confirmations of the theory of general relativity.\u201d<\/p>\n

\u201cPushing the edges\u201d<\/p>\n

Black holes are created when all the matter in a dying star collapses into a single point. Black holes are therefore among the densest objects in the universe.\u00a0Black holes often form in pairs, bound together through the gravitational attraction. As they spiral toward each other, they emit enormous amounts of energy in the form of gravitational waves, before merging into a more massive black hole.<\/p>\n

A binary black hole was the source of the very first gravitational-wave detection, made by NSF\u2019s LIGO observatories\u00a0in 2015<\/a>, and colliding black holes are the source of many of the gravitational waves detected since then. Such \u201cbread-and-butter\u201d binaries typically consist of two black holes of similar size (usually several tens of times more massive than the sun) that merge into one larger black hole.<\/p>\n

Gravitational waves can also be produced by the collision of a black hole with a neutron star, which is an extremely dense remnant core of a massive star. While the collision of two black holes only produces gravitational waves, a smash-up involving a neutron star can also generate light, which provides more information about the event that scientists can probe. In its first three observing runs, the LVK observatories detected signals from a handful of collisions involving a black hole and neutron star, as well as two collisions between two neutron stars.<\/p>\n

The newest detections published today reveal a greater variety of binaries that produce gravitational waves. In addition to the black hole binaries, the updated catalog includes the heaviest black hole binary; a binary with black holes of asymmetric, lopsided masses; and a binary where both black holes have exceptionally high spins. The catalog also holds two black hole-neutron star binaries.<\/p>\n

\u201cThe message from this catalog is: We are expanding into new parts of what we call \u2018parameter space\u2019 and a whole new variety of black holes,\u201d says co-author Daniel Williams, a research fellow at the University of Glasgow and a member of the LVK. \u201cWe are really pushing the edges, and are seeing things that are more massive, spinning faster, and are more astrophysically interesting and unusual.\u201d<\/p>\n

Unusual signals<\/p>\n

The LIGO, Virgo, and KAGRA observatories detect gravitational waves using L-shaped, kilometer-scale instruments, called interferometers. Scientists send laser light down the length of each tunnel and precisely measure the time it takes each beam to return to its source. Any slight difference in their timing can mean that a gravitational wave passed through and minutely wobbled the laser\u2019s light.<\/p>\n

For the first segment of the LVK\u2019s fourth observing run, gravitational-wave detections were made using only LIGO\u2019s identical interferometers \u2014 one located in Hanford, Washington, and the other in Livingston, Louisiana. Recent upgrades to LIGO\u2019s detectors\u00a0enabled them to search for signals from binary neutron stars as far out as 360 megaparsecs, or about 1 billion light-years away, and for signals from binaries including black holes tens of times farther away.<\/p>\n

\u201cYou can\u2019t ever predict when a gravitational wave is going to come into your detector,\u201d says co-author and LVK member Amanda Baylor, a graduate student at the University of Wisconsin at Milwaukee who was involved in the signal search process. \u201cWe could have five detections in one day, or one detection every 20 days. The universe is just so random.\u201d<\/p>\n

Among the more unusual signals that LIGO detected in the first phase of the O4 observing run was GW231123_135430, which is the heaviest black hole binary<\/a> detected to date. Scientists estimate that the signal arose from the collision of two heavier-than-normal black holes, each roughly 130 times as massive as the sun. (Most of the detected merging black holes are around 30 solar masses.) The much heavier black holes of GW231123_135430 suggest that each may be a product of a prior collision of lighter \u201cprogenitor\u201d black holes.<\/p>\n

Another standout is\u00a0GW231028_153006, which is a black hole binary with the highest inspiral spin, meaning that both black holes appear to be spinning very fast, at about 40 percent the speed of light. Again, scientists suspect that these black holes were also products of previous mergers that spun them up as they were created from two smaller, inspiraling black holes.<\/p>\n

The O4 run also detected GW231118_005626 \u2014 an unusually lopsided pair, with one black hole twice as massive as the other.\u00a0<\/p>\n

\u201cOne of the striking things about our collection of black holes is their broad range of properties,\u201d says co-author LVK member Jack Heinzel, an MIT graduate student who contributed to the catalog\u2019s analysis. \u201cSome of them are over 100 times the mass of our sun, others are as small as only a few times the mass of the sun. Some black holes are rapidly spinning, others have no measurable spin. We still don\u2019t completely understand how black holes form in the universe, but our observations offer a crucial insight into these questions.\u201d<\/p>\n

Cosmic connections<\/p>\n

From the newest gravitational-wave detections, scientists have begun to make connections about the properties of black holes as a population.<\/p>\n

\u201cFor instance,\u00a0this dataset has increased our belief that black holes that collided earlier in the history of the universe could more easily have had larger spins than the ones that collided later,\u201d says LVK member Salvatore Vitale, associate professor of physics at MIT and member of the MIT LIGO Lab.<\/p>\n

This idea raises interesting questions about what sort of conditions could have spun up black holes in the early universe.<\/p>\n

The new detections have also allowed scientists to test Albert Einstein\u2019s general theory of relativity, which describes gravity as a geometric property of space and time.<\/p>\n

\u201cBlack holes are one of the most iconic and mind-bending predictions of\u00a0general relativity,\u201d says co-author and LVK member Aaron Zimmerman, associate professor of physics at the University of Texas at Austin, adding that when black holes collide, they \u201cshake up space and time more intensely than almost any other process we can imagine observing. When testing our physical theories, it\u2019s good to look at the most extreme situations we can, since this is where our theories are most likely to break down, and where we have the best chance of discovery.\u201d<\/p>\n

Scientists put Einstein\u2019s theory to the test using\u00a0GW230814_230901, which is one of the \u201cloudest\u201d gravitational-wave signals observed to date. The surprisingly clear signal gave scientists a chance to probe it in detail, to see if any aspects of the signal might deviate from what Einstein\u2019s theory predicts.\u00a0This signal pushed the limits of their tests of general relativity, passing most with flying colors but illustrating how environmental noise can challenge others in such an extreme scenario.<\/p>\n

\u201cSo far, the theory is passing all our tests,\u201d Zimmerman says. \u201cBut we\u2019re also learning that we have to make even more accurate predictions to keep up with all the data the universe is giving us.\u201d<\/p>\n

The updated catalog is also helping scientists to nail down a key mystery in cosmology: How fast is the universe expanding today? Scientists have tried to answer this by measuring a rate known as the Hubble constant. Various methods, using different astrophysical sources, have given conflicting answers.<\/p>\n

Gravitational waves offer an alternative way to measure the Hubble constant, since scientists are able to work out, in relatively straightforward fashion, how far these waves traveled from their source.<\/p>\n

\u201cMerging black holes have a really unique property: We can tell how far away they are from Earth just from analyzing their signals,\u201d says co-author and LVK member Rachel Gray, a lecturer at the University of Glasgow who was involved in the cosmological interpretations of the catalog\u2019s data. \u201cSo, every merging black hole gives us a measurement of the Hubble constant, and by combining all of the gravitational wave sources together, we can vastly improve how accurate this measurement is.\u201d<\/p>\n

By analyzing all the gravitational-wave detections in the LVK\u2019s entire catalog, scientists have come up with a new, independent estimate of the Hubble constant, that suggests the universe is expanding at a rate of 76 kilometers, per second, per megaparsec (a square volume of about half a billion light-years wide).<\/p>\n

\u201cIt\u2019s still early days for this method, and we expect to significantly improve our precision as we detect more gravitational wave sources,\u201d Gray says.<\/p>\n

\u201cEach new gravitational-wave detection\u00a0allows us to unlock another\u00a0piece of the\u00a0universe\u2019s puzzle in ways we couldn\u2019t just a decade ago,\u201d says Lucy Thomas, who led part of the catalog\u2019s analysis, and is a postdoc in the Caltech LIGO Lab. \u201cIt\u2019s incredibly exciting to think about what astrophysical mysteries and surprises we can uncover with future observing runs.”<\/p>\n","protected":false},"excerpt":{"rendered":"When the densest objects in the universe collide and merge, the violence sets off ripples, in the form…\n","protected":false},"author":2,"featured_media":330361,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[152452,11857,61,60,152451,33459,36075,152450,9304,82,24603],"class_list":{"0":"post-330360","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-science","8":"tag-black-hole-science","9":"tag-gravitational-waves","10":"tag-ie","11":"tag-ireland","12":"tag-kagra","13":"tag-ligo","14":"tag-ligo-scientific-collaboration","15":"tag-mit-kavli","16":"tag-mit-physics","17":"tag-science","18":"tag-virgo"},"_links":{"self":[{"href":"https:\/\/www.newsbeep.com\/ie\/wp-json\/wp\/v2\/posts\/330360","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.newsbeep.com\/ie\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.newsbeep.com\/ie\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/ie\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/ie\/wp-json\/wp\/v2\/comments?post=330360"}],"version-history":[{"count":0,"href":"https:\/\/www.newsbeep.com\/ie\/wp-json\/wp\/v2\/posts\/330360\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/ie\/wp-json\/wp\/v2\/media\/330361"}],"wp:attachment":[{"href":"https:\/\/www.newsbeep.com\/ie\/wp-json\/wp\/v2\/media?parent=330360"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.newsbeep.com\/ie\/wp-json\/wp\/v2\/categories?post=330360"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.newsbeep.com\/ie\/wp-json\/wp\/v2\/tags?post=330360"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}