Tag

Neutrinos

All articles tagged with #neutrinos

science3 days ago•10 min saved

Cosmic Voids: The Universe’s Quiet Labs for Big Questions

Cosmic voids—vast, underdense regions in the cosmic web—are becoming powerful cosmological laboratories for gravity, dark energy, and the Hubble tension. New surveys like DESI and Euclid will map tens of thousands to over 100,000 voids with high fidelity, while advanced simulations fill in their evolution. By tracing how galaxies and other tracers move through voids, scientists test gravity theories, study neutrinos, and sharpen our understanding of dark energy. Some researchers even speculate we may live in a colossal supervoid that could help explain the slightly faster local expansion rate, the Hubble tension. The next decade should decisively test these ideas and deepen our view of the universe.

via WIRED|

#cosmic-voids #cosmology #dark-energy

space13 days ago•75 min saved

CubeSat neutrino detector aims to illuminate solar core from orbit

Space.com reports the world’s first space-based neutrino detector, SNAPPY, has launched to a ~310‑mile Earth orbit aboard SpaceX CAS500‑2 for about two years. The 3U CubeSat carries gallium‑tungsten detector crystals to catch solar neutrinos closer to the Sun, testing space-based detection technology and potentially enabling future solar-neutrino missions and imaging of solar fusion shells.

via Space|

#cubesat #neutrinos #snappy

science27 days ago•6 min saved

Antarctic Ice Detects 13 Cosmic-Ray Radio Pulses, Validating Askaryan Radiation

Researchers buried antennas in Antarctic ice and identified 13 radio pulses from cosmic-ray cascades. New simulations applied to the 2019 data show the signals match the predicted Askaryan radiation in arrival direction, frequency, waveform and polarization at 5.1 sigma, confirming the model and distinguishing them from neutrinos. A full multi-year data release from all five ARA stations is expected soon, with up to seven candidate neutrino events.

via Boing Boing|

#antarctic-ice #ara #askaryan-radiation

science1 month ago•17 min saved

Sterile Neutrino Hypothesis Fails the Latest Tests

Decades of hints for a light sterile neutrino have collapsed after recent null results (KATRIN and MicroBooNE, plus reactor and gallium studies), effectively ruling out the simplest sterile-neutrino explanation for several anomalies. While the LSND/Miniboone/gallium puzzles remain unexplained, physicists are pursuing more complex neutrino scenarios and await data from JUNO, DUNE, and Isodar to map neutrino masses and oscillations.

via Quanta Magazine|

#anomalies #neutrino-oscillations #neutrinos

science1 month ago•5 min saved

Antarctic Radio Anomaly Deepens Mystery as ANITA Signals Defy Explanation

NASA’s ANITA detected unusual radio pulses from beneath the Antarctic ice (2016–2018). New analyses rule out simple neutrino explanations and cross-checks with the Pierre Auger Observatory and IceCube found no similar events, suggesting the anomaly isn’t new physics but a complex propagation effect near ice; a next‑gen detector, PUEO, may help resolve the mystery.

via The Daily Galaxy|

#anita #anomaly #antarctica

astronomy2 months ago•54 min saved

A buried neutrino telescope may hear the ghosts of ancient stars

An upgrade to Japan’s Super-Kamiokande underground neutrino detector could soon pick up neutrinos from supernovae that exploded billions of years ago, enabling scientists to study the deaths of stars across cosmic history through these ghost particles that rarely interact with matter.

via Space|

#astronomy #ghost-particles #neutrinos

science2 months ago•4 min saved

Blazar Jets as Cosmic Neutrino Engines? New Record Points to Extreme Galaxies

A Mediterranean KM3NeT/ARCA detector captured a 220 PeV neutrino—the most energetic yet—sparking a study that points to blazars (jets from supermassive black holes aligned toward Earth) as likely accelerators. The team cross-checked with IceCube and Fermi data and noted no electromagnetic counterpart, suggesting a diffuse background of multiple sources rather than a single cataclysmic event. With KM3NeT expanding to full size, researchers expect more high-energy neutrinos to sharpen the origin story.

via ScienceAlert|

#astrophysics #blazars #km3net

science3 months ago•16 min saved

Antarctic Ice Upgrades Listen for Neutrino Clues to the Cosmos

Scientists completed a seven-year upgrade to the IceCube Neutrino Observatory by drilling six holes about 1.5 miles deep at the South Pole and stringing hundreds of light sensors through the ice, creating a denser network to catch fleeting neutrino footprints and help answer fundamental questions about the universe.

via The Washington Post|

#antarctica #astronomy #icecube-neutrino-observatory

space3 months ago•6 min saved

Dark-Charge Black Holes May Explain Ultra-High-Energy Neutrino Burst

KM3NeT detected a 100 PeV neutrino (KM3-230213A) with no known source. A Physical Review Letters study proposes exploding quasi-extremal primordial black holes with a dark charge as a possible origin, invoking Hawking radiation that heavier, lighter PBHs would emit high-energy particles in a final burst. IceCube has not observed a comparable event, possibly due to its different energy window. If correct, such PBH evaporations could occur roughly every decade, linking ultra-high-energy neutrinos to PBH physics.

via ScienceAlert|

#dark-charge #hawking-radiation #km3net

science3 months ago•11 min saved

Dark-Charged Black Holes May Explain Ultra-Energetic Neutrino

A 2023 KM3NeT detection of a ~220 PeV neutrino challenges standard sources; researchers propose it came from a quasi-extremal primordial black hole carrying dark charge that evaporates via a dark Schwinger effect, discharging explosively and emitting high-energy neutrinos while spending most of its life dormant. If correct, such black holes could explain the IceCube–KM3NeT mismatch and potentially account for dark matter.

via ZME Science|

#dark-matter #dark-sector #hawking-radiation

science3 months ago•5 min saved

Dark-Charge Black Holes Could Rewrite Our View of Neutrinos and Dark Matter

UMass Amherst theorists propose that explosions of quasi-extremal primordial black holes with a dark charge could produce the 2023 ultra-high-energy neutrino and, if true, link Hawking radiation to primordial black holes and dark matter, offering a new path to understand fundamental physics.

via UMass Amherst|

#dark-charge #dark-matter #hawking-radiation

science4 months ago•13 min saved

Ultra-energetic Neutrino Sparks Primordial Black Hole Hypothesis

A record-energy neutrino detected by the KM3NET underwater telescope could originate from the explosive end of a primordial black hole, a provocative link to dark matter. Kaiser and Klipfel model a scenario where a small asteroid-mass PBH exploded about 2,000 AU away to produce the neutrino, estimating roughly an 8% chance. While intriguing, the idea remains unproven and controversial among scientists.

via Quanta Magazine|

#dark-matter #hawking-radiation #km3net

physics-and-mathematics4 months ago•56 min saved

Dark matter–neutrino interaction hints at a cosmology breakthrough

Researchers report a 3-sigma hint that dark matter and neutrinos may interact, transferring momentum and potentially reducing the universe’s observed clumpiness. If confirmed, this could require updates to the lambda-CDM model and help address the S8 tension between early- and late-universe measurements. The finding combines Planck/ACT early-universe data with BAO and cosmic-shear observations and simulations, but it remains unproven and will hinge on forthcoming data from surveys like the Vera Rubin Observatory for confirmation. A confirmed interaction would constitute a fundamental breakthrough in cosmology and particle physics.

via Live Science|

#cosmology #dark-matter #lambda-cdm

science4 months ago•5 min saved

Antarctic Balloons Tap New Clues in Dark Matter Quest

NASA’s four long-duration balloons over Antarctica carried the GAPS antimatter detector, the PUEO neutrino observatory, and calibration HiCal payloads, flying for weeks to gather data on rare particles and push forward our search for dark matter and insights into the universe’s origins.

via The Daily Galaxy|

#antarctica #antimatter #dark-matter

science4 months ago•36 min saved

Elusive Particles May Interact, Redrawing Our Cosmic Map

A new study suggests a possible though not yet proven interaction between dark matter and neutrinos with a coupling strength around 10^-4, which could help explain why the universe is less clumpy than early-universe data alone would predict. By analyzing cosmic shear data from both early and late universe observations (ACT, Planck, DES, and SDSS), researchers propose that such interactions could influence structure formation without overturning the ΛCDM model. The finding sits at about 3 sigma significance, far from definitive proof, but it offers a potential direction for future telescope surveys and laboratory experiments to probe dark matter properties further.

via Yahoo|

#cosmic-shear #dark-matter #lambda-cdm