{"id":23129,"date":"2025-07-20T05:41:07","date_gmt":"2025-07-20T05:41:07","guid":{"rendered":"https:\/\/www.newsbeep.com\/us\/23129\/"},"modified":"2025-07-20T05:41:07","modified_gmt":"2025-07-20T05:41:07","slug":"strange-neutrino-interactions-could-change-how-stars-die-study-finds","status":"publish","type":"post","link":"https:\/\/www.newsbeep.com\/us\/23129\/","title":{"rendered":"Strange neutrino interactions could change how stars die, study finds"},"content":{"rendered":"

When massive stars reach the end of their lives, something strange and violent happens deep inside them. As they run out of fuel, their cores begin to collapse under their own weight. But this collapse doesn\u2019t happen in silence. One of the most elusive and ghostlike particles in the universe\u2014neutrinos<\/a>\u2014plays a key role in what comes next. And according to new research, those neutrinos may be doing something even more mysterious than previously believed.<\/p>\n

Neutrinos: Ghost Particles With a Powerful Punch<\/p>\n

Neutrinos are tiny, nearly massless particles that fly through the universe at nearly the speed of light. They’re often called \u201cghost particles\u201d because they hardly interact with anything. Every second, trillions pass through your body without you noticing. They come in three types, or \u201cflavors\u201d: electron, muon, and tau. Despite being everywhere, neutrinos remain hard to study. That\u2019s because they rarely hit or interact with other particles, making them slippery subjects for scientists.<\/p>\n

Left: With standard neutrino interactions, the collapsing star’s core stays cooler, neutrinos remain mostly electron flavor, and a neutron star often forms. Right: If neutrinos interact secretly, all flavors emerge, the core heats rapidly, nuclei break down, and a black hole may result instead. (CREDIT: UC San Diego) <\/p>\n

But when a very large star collapses, things change. The core of the star becomes so dense that even neutrinos start to get trapped. They collide with each other more often, something that\u2019s almost impossible to see in a lab. That\u2019s why some scientists call these collapsing stars natural \u201cneutrino colliders.\u201d<\/p>\n

What happens in this extreme environment may help answer one of the big mysteries in physics: do neutrinos interact with each other in strange, \u201csecret\u201d ways beyond the rules we already know? The standard model of particle physics<\/a> says they shouldn\u2019t. But many scientists think there could be more going on\u2014like hidden forces or interactions just between neutrinos.<\/p>\n

A Hotter, More Chaotic Core<\/p>\n

In the traditional model, neutrinos behave as expected. They are mostly of the electron type, and their interactions with the matter in the star lead to a relatively cool core. This kind of collapse tends to leave behind a neutron star\u2014a very dense object made mostly of neutrons.<\/p>\n

Related Stories<\/p>\n

But what if neutrinos secretly violate lepton number conservation? That would mean neutrinos and antineutrinos could swap and mix much more freely than expected. The N3AS team found that this kind of mixing would change everything. The core would heat up, more flavors of neutrinos would appear, and electrons would be captured more easily by protons. That leads to fewer electrons overall, which lowers the electron fraction in the star\u2019s core.<\/p>\n

The result is a messier, hotter collapse. Instead of forming a neutron star, the core could get so hot and so full of neutrons that it becomes a black hole<\/a>. That\u2019s a big change\u2014and it\u2019s all thanks to neutrinos behaving in ways we\u2019ve never seen before.<\/p>\n

What the Science Says<\/p>\n

In their paper, the researchers explain that a rapid balancing of neutrinos and antineutrinos creates more disorder, or entropy, in the core. This extra entropy drives more electron capture, leading to a core with fewer electrons and more neutrons. That affects how the collapse unfolds and what kind of remnant is left behind.<\/p>\n

The region of the LNV parameter space. (CREDIT: Anna M. Suliga, et al.) <\/p>\n

The effect is especially strong when neutrinos interact with each other in a way that violates lepton number. These interactions\u2014called lepton-number-violating neutrino self-interactions, or LNV \u03bdSI\u2014are not part of the standard model. But if they exist, they could be changing the final moments of massive stars in ways we haven\u2019t recognized until now.<\/p>\n

The paper also outlines how specific ranges of particle masses and interaction strengths would be needed for this theory to hold. These values aren\u2019t just theoretical. They could be tested in the near future using particle accelerators<\/a> and detectors designed to study neutrinos.<\/p>\n

Clues From the Future<\/p>\n

So how can we find out if these strange neutrino behaviors are real? Scientists are hoping that new technology will help. The Deep Underground Neutrino Experiment, or DUNE, is being built at the Fermi National Accelerator Laboratory. When complete, DUNE will send beams of neutrinos through the Earth to see how they change. It\u2019s one of the most advanced experiments ever planned to study these ghostlike particles.<\/p>\n

Temporal evolution of the effective temperatures (in MeV) for neutrinos (T\u03bd), and the matter component (Te), and entropy-per-baryon skB in units of Boltzmann\u2019s constant kB. (CREDIT: Anna M. Suliga, et al.) <\/p>\n

If LNV \u03bdSI interactions are real, DUNE might be able to spot them. But it\u2019s not the only hope. Scientists are also keeping an eye on the sky. When a massive star collapses in our galaxy<\/a>, it sends out a flood of neutrinos. If detectors on Earth can catch those neutrinos, they may show unexpected patterns\u2014clues that something strange happened inside the star. <\/p>\n

Gravitational waves\u2014ripples in space caused by big cosmic events\u2014might also help. A core collapse with secret neutrino interactions could produce a different wave pattern than a standard collapse. Observing those differences could add one more piece to the puzzle.<\/p>\n

Looking Beyond the Standard Model<\/p>\n

For decades, physicists have relied on the standard model to explain how particles behave. It\u2019s one of the most successful theories in science. But it has limits. It doesn\u2019t explain gravity, dark matter, or many mysteries of the universe<\/a>. Now, neutrinos might be leading us toward something new.<\/p>\n

Solutions for the thermal and chemical equilibrium values. (CREDIT: Anna M. Suliga, et al.) <\/p>\n

If neutrinos do violate lepton number conservation, it would mean there’s more to the story than we thought. It would open a door to physics beyond the standard model\u2014possibly linking to dark matter or the early moments of the universe. The work by the N3AS team is theoretical, but it gives scientists a new direction to explore. <\/p>\n

With new tools and detectors, the next few years could bring answers to some of physics\u2019 biggest questions.<\/p>\n","protected":false},"excerpt":{"rendered":"When massive stars reach the end of their lives, something strange and violent happens deep inside them. As…\n","protected":false},"author":2,"featured_media":23130,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[49],"tags":[199,79],"class_list":{"0":"post-23129","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-physics","8":"tag-physics","9":"tag-science"},"_links":{"self":[{"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/posts\/23129","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/comments?post=23129"}],"version-history":[{"count":0,"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/posts\/23129\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/media\/23130"}],"wp:attachment":[{"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/media?parent=23129"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/categories?post=23129"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/tags?post=23129"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}