Articles tagged with Astroparticle Physics
Astronomers have observed a new phase of short GRBs, powered by a compact object merger, revealing a hidden X-ray chapter of cosmic collisions. The discovery opens a new window for multi-messenger astronomy, demonstrating Einstein Probe's unique capability to uncover new classes of transient phenomena.
A new study suggests that neutrino flavor conversion plays a significant role in determining the fate of dying massive stars. The research found that neutrino behavior can alter the outcome of stars, particularly for those with masses between 16 and 30 solar masses, potentially explaining the supernova rate problem.
Researchers from HKU and BNU used wave simulations to test the effects of ultralight dark matter on gravitationally lensed images. The simulations reproduced observed image positions more closely than common models, suggesting gravitationally lensed systems could be used to test ultralight-dark-matter models.
Researchers reveal that spacecraft observations can conceal the true movement of particles in near-Earth space, challenging traditional assumptions about radiation belt dynamics. The study highlights a fundamental challenge for space scientists: different physical processes can produce similar observational evidence.
Researchers from Kyushu University found that low-density gas contributes to hub growth through direct inflow and by replenishing nearby dense filaments, substantially underestimating the material available for massive star formation. The study's combined analysis of dense and diffuse gas increased estimated material flowing onto hubs ...
Researchers at Kyoto University used the Earth's magnetic field to search for axions and dark photons, two leading candidates for dark matter. The team set new limits on axion mass, rivaling previous constraints from astrophysical observations, and detected potential signals from dark photons.
A team of researchers from Kyushu University and Max Planck Institute for Extraterrestrial Physics have detected ambipolar diffusion in a prestellar core, weakening magnetic support and leading to gravitational collapse. This finding provides insight into early star formation and the creation of stellar systems like our own.
A UK collaboration has demonstrated a key principle behind next-generation quantum detectors can work under realistic conditions. By comparing two long-baseline atom interferometers, researchers effectively cancelled experimental noise, opening the door to searches for gravitational waves and signatures of exotic forms of dark matter.
New study by University of Southampton confirms the universe's expansion is still accelerating as previously found, debunking 2025 claims that the cosmos was slowing. The team re-evaluated data using Type Ia supernovae to calculate vast cosmic distances and found no error in their methods.
Researchers at Texas A&M University are designing how humans will build and survive on the moon, focusing on sustainable construction using lunar regolith. The institution's efforts aim to reduce costs associated with shipping materials to the moon, making it possible to produce rocket propellant locally.
Researchers at MIT and Europe create model predicting gravitational wave patterns from black holes in dark matter environments, detecting possible imprints on LVK data. The study offers a new way to screen gravitational-wave signals for hints of dark matter.
Research suggests that some ultrahigh-energy cosmic rays could consist of atomic nuclei heavier than iron, losing energy more slowly as they travel through intergalactic space. This finding could help narrow down the possible sources of these particles and impact how we search for their origins.
The DAMPE satellite has identified a universal feature in the energy spectra of primary cosmic ray nuclei, revealing that spectral softening occurs around a rigidity of about 15 TV. This observation strongly supports models explaining the acceleration and transport of cosmic rays based on their rigidity.
A new detector technology has been developed to track elementary particles in large volumes of unsegmented scintillator material. The system uses a plenoptic camera and single-photon avalanche diode array sensors to achieve high-resolution 3D tracking, even in photon-starved conditions.
A team of undergraduate students built a cavity detector to search for axions and set new experimental limits on their properties. The result was achieved with relatively limited resources, showcasing the potential for small-scale experiments in precision cosmology.
Researchers suggest that dark matter may consist of multiple particles, whose behavior varies depending on the cosmic environment. This could explain why a signal observed at the center of our galaxy is not seen in dwarf galaxies.
A new study suggests that the ultra-high-energy neutrino may have originated from a population of blazars, which could provide a plausible explanation for the rare phenomenon. The researchers used a combination of simulations and observations from various instruments to test their hypothesis.
Researchers created the highest resolution map of dark matter, showing its interaction with normal matter through gravity. The new data from NASA's James Webb Space Telescope confirms previous research and provides new details about dark matter's influence on the Universe.
Researchers at the University of Plymouth have discovered a method to increase muon lifetime using intense laser pulses. By applying quantum interference principles, they aim to develop new scientific facilities that utilize muons instead of electrons.
A new study has created a comprehensive model of neutrino mapping, revealing that most stars in the Milky Way generate and emit these ghost particles. The research provides valuable insights into the universe, offering a unique way to explore cosmic phenomena.
Astronomers have detected a new gamma-ray source near Westerlund 1, a young massive star cluster in the Milky Way. The source is connected to a 'nascent outflow' of particles driven by the cluster's collective wind, creating a cavity in the interstellar medium.
The KATRIN collaboration presents the most precise direct search for sterile neutrinos through measurements of tritium β-decay. No sign of a sterile neutrino was found, excluding a large region of parameter space suggested by earlier anomalies. The result relies on distinct detection methods and complements oscillation experiments.
Researchers believe they have finally detected gamma rays predicted by the annihilation of theoretical dark matter particles. The observed energy spectrum matches the emission predicted from weakly interacting massive particles, with a mass approximately 500 times that of a proton.
A study from Bielefeld University reveals that the solar system is moving more than three times faster than predicted by current models. This deviation was detected using data from radio galaxies, which emit strong radio waves and can penetrate dust and gas.
Physicists have analyzed how neutrinos change 'flavor' as they travel through the cosmos, gaining insights into their masses and evolution. The study's findings hint at possible Charge-Parity violation in neutrinos and their antimatter counterparts, with researchers seeking more data to answer fundamental questions about the universe.
Researchers from Tel Aviv University predict that detecting radio waves from the cosmic dark ages can help resolve the nature of dark matter. The study uses computer simulations to show that dense clumps of dark matter formed throughout the Universe, pulling in hydrogen gas and causing it to emit intense radio waves.
Recent detection of a record-setting neutrino may be the first evidence of Hawking radiation from a primordial black hole. If confirmed, it would indicate that PBHs make up most of dark matter in the universe.
Researchers at Rutgers University uncovered evidence of how galaxies expand by tracing the invisible scaffolding of the universe created by dark matter. They analyzed large samples of special galaxies called Lyman-alpha emitters to study galaxy formation and evolution over billions of years.
Scientists have discovered a rare cosmic pattern known as an Einstein Cross with a fifth image, which reveals hidden dark matter. The team used computer modeling and analysis to infer the presence of a massive, invisible mass surrounding the foreground galaxies.
Researchers analyzed 10 SEP events with inverse velocity dispersion signatures to investigate underlying mechanisms. The study found that energy-dependent release and longer timescales for high-energy particles explain the counterintuitive behavior.
Researchers propose that Jupiter-sized exoplanets may accumulate and collapse into detectable black holes due to dark matter. This process could potentially generate multiple black holes in a single exoplanet's lifetime, making exoplanet surveys a promising method for hunting superheavy dark matter particles.
Physicists from the University of Copenhagen have discovered a step-like signature that resembles the signature of an elusive axion particle using galaxy clusters. This method has greatly increased what we know about axions, allowing researchers to narrow down the space where it can be found.
The CTAO LST Collaboration presents groundbreaking findings on the nature of gamma-ray bursts, supporting theoretical models of structured, multi-layered jets. The observations of GRB 221009A provide new clues about jet formation mechanisms and the central engine behind these cosmic phenomena.
Researchers observed a flare caused by a star falling onto a black hole and surviving the encounter. The discovery suggests that these flares may be part of a longer, more complex story about supermassive black holes.
Researchers successfully demonstrate Fermi acceleration mechanism with ultracold atoms, unlocking new understanding of cosmic rays behavior. The technology has the potential for high-precision control over particle acceleration and opens new possibilities for investigating phenomena relevant to high-energy astrophysics.
Researchers from Penn University propose a five-member particle package, known as the 5-plet, that string theory cannot accommodate. This particle family is absent in any known string-based calculation, raising concerns about the framework's validity.
Researchers at Rice University have conducted the first direct search for ultralight dark matter using a magnetically levitated particle. Despite high sensitivity, they did not find evidence of the anticipated signal, ruling out specific interactions between dark matter and ordinary matter.
A team from Norwegian University of Science and Technology proposes that supermassive black hole winds accelerate particles to create the mysterious high-energy radiation. The winds, which can reach speeds of up to half the speed of light, may be responsible for the creation of ultra-high-energy cosmic rays.
The University of Texas at Arlington's ATLAS Experiment team has made significant contributions to the discovery of the Higgs boson particle. The team's work on the Large Hadron Collider at CERN led to a Noble Prize in 2013 and has earned them a $1 million Breakthrough Prize in Fundamental Physics.
Researchers at Dartmouth College propose a new theory on the origin of dark matter, suggesting it could have formed from high-energy massless particles that rapidly condensed into cold, heavy particles. The theory can be tested using existing observational data, including the Cosmic Microwave Background radiation.
Researchers developed an advanced detector system combining silicon and germanium detectors for high-efficiency charged-particle decay studies. The system achieved precise tracking of decay processes and efficient discrimination between particles, showcasing its potential for studying exotic nuclear structures.
Researchers estimate that detecting no signs of life on 40-80 exoplanets would allow for an upper limit on the prevalence of life in the universe. However, uncertainties and biases in individual observations must be carefully considered to ensure reliable results.
Researchers propose a new methodology to test the Universe's isotropy using Euclid space telescope data, aiming to detect potential anisotropies that challenge the Standard Model of Cosmology. If confirmed, these findings would open a new chapter in cosmology, potentially revising our understanding of the Universe's behavior.
Researchers from NTU Singapore have developed a new crystal structure that shows naturally existing particles can behave like axions, promising to detect dark matter. The findings could lay the groundwork for understanding cosmic phenomena and uncovering the universe's greatest mysteries.
Researchers at GSI Helmholtzzentrum für Schwerionenforschung GmbH measure half-life of thallium-205 ion decay to understand Sun's long-term stability and its connection to Earth's climate. The experiment, known as LOREX, provides insights into the Sun's evolutionary history.
A new paper in JCAP proposes a way to test the anthropic principle, which suggests the universe is fine-tuned for life. The proposal involves confirming three conditions: cosmic inflation, axion existence, and dark matter not being made of axions.
A recent study suggests that the observation of antihelium nuclei in cosmic rays may be consistent with the existence of WIMP particles, which could make up dark matter. The detection of two distinct isotopes, antihelium-3 and -4, is particularly intriguing as heavier nuclei are unlikely to be produced through natural processes.
Researchers have created a complex molecule in space-like conditions, finding glyceric acid, a key building block of life on Earth. This discovery fills an important gap in understanding the origin of life, suggesting that molecules essential for life may be more common in space than previously thought.
Physicists from Amsterdam and Copenhagen suggest that a careful analysis of merging black hole pairs' gravitational waves could reveal the existence of new ultralight bosons. This process, called superradiance, provides an opportunity to probe these particles, which may resolve puzzles in astrophysics and particle physics.
Dr. Zewei Xiong has received an ERC Starting Grant to study collective neutrino oscillations in supernovae and neutron-star mergers. His project NeuTrAE aims to clarify lingering puzzles regarding neutrino flavor evolution, a crucial aspect of particle and nuclear astrophysics.
A new study published in Physical Review Letters suggests that nanohertz gravitational waves may not originate from supercool first-order phase transitions. Researchers found that such transitions would struggle to complete, shifting the frequency of the waves away from nanohertz frequencies.
Astronomers have discovered a nearby star that rotates faster than expected, with anomalies in its stellar rotation profile. This finding provides insights into fundamental stellar strophysics and challenges current understanding of stellar dynamics and magnetic dynamos.
Researchers used hydrogen to track dark matter's presence in the universe, revealing a tension between observations and theoretical predictions. The findings suggest that an unknown particle or new physics may be responsible for this discrepancy.
Researchers at Lancaster University and others are building the most sensitive dark matter detectors using quantum technologies. They aim to detect dark matter particles weighing between 0.01 to a few hydrogen atoms, which could reveal the mass and interactions of these mysterious particles.
New simulations show that neutrinos created during neutron star collisions can be trapped at the interface of merging stars and interact with matter for 2-3 milliseconds. This brief out-of-equilibrium phase is crucial in understanding the physics of these extreme events.
Researchers at University of Rochester's Laboratory for Laser Energetics have developed a novel way to experimentally produce plasma 'fireballs' on Earth, generating high-density relativistic electron-positron pair plasmas. This breakthrough enables follow-up experiments that could yield fundamental discoveries about the universe.
Astronomers have discovered an enormous circular radio feature around a galaxy, dubbed the Cloverleaf, which was created by clashing groups of galaxies. The XMM-Newton satellite has detected X-ray emission associated with this structure for the first time, revealing clues about its formation and the merger process.
Researchers discovered a 'cosmic glitch' in the universe's gravity, explaining strange behavior on a cosmic scale. The new model modifies Einstein's general relativity, resolving inconsistencies without affecting existing uses.
A research team led by Dr. Serge Krasnokutski has discovered that peptides can form on cosmic dust particles even in the presence of water molecules. The study used a vacuum chamber to replicate interstellar conditions and found that the formation of peptides was slowed down but still occurred.
Researchers at SLAC National Accelerator Laboratory propose detecting thermalized dark matter, which builds up on Earth's surface, using quantum sensors. The study suggests that superconducting quantum devices could be redesigned to detect low-energy galactic dark matter particles.