All articles tagged with #axions
A new study proposes that tiny energy bursts from decaying dark matter in the early universe could nudge pristine hydrogen gas clouds to collapse faster, facilitating direct-collapse black holes and potentially explaining the unexpectedly early appearance of supermassive black holes seen by JWST. The model highlights axion-like particles in the 24–27 eV range as the right environment to enable rapid formation.
A multi-city network of hyperpolarized noble-gas spin sensors correlates five lab setups to search for transient, defect-induced axion signals. Through amplified signals and optimized noise filtering, the experiment constrains axion–nucleon coupling across 10 peV to 0.2 μeV, achieving 4.1×10^10 GeV at 84 peV. These bounds surpass some astrophysical limits under different model assumptions and illustrate a path toward detecting transient axion phenomena (waves, axion stars, strings, Q-balls) with distributed quantum sensors.
A new study suggests that fusion reactors might inadvertently produce axions, a candidate for dark matter, through interactions of neutrons with reactor walls, turning these energy devices into potential dark matter factories and offering a novel way to detect elusive particles using existing infrastructure.
Researchers from the University of Cincinnati and collaborators have proposed a theoretical method for producing axions, a candidate for dark matter, inside fusion reactors, building on concepts humorously referenced in 'The Big Bang Theory.' Their findings suggest that fusion reactors could generate particles linked to the dark sector through neutron interactions, offering a potential new avenue for dark matter research.
Researchers from the University of British Columbia explored the potential link between axions, a dark matter candidate, and white dwarf stars, using data from the Hubble Space Telescope. Although their analysis did not find evidence of axion-induced cooling, it established new limits on axion-electron interactions, guiding future dark matter research. The study highlights the importance of exploring various astrophysical phenomena to understand elusive particles like axions.
Researchers used archival Hubble data to test axion models by examining white dwarf cooling rates, but found no evidence for axions, setting new constraints on their interaction with electrons and highlighting the need for more innovative detection methods.
A physicist from the University of Cincinnati has theoretically solved a problem related to producing axions, hypothetical particles linked to dark matter, in fusion reactors—an issue that was humorously depicted as unsolvable by Sheldon Cooper and Leonard Hofstadter in 'The Big Bang Theory.' The research, conducted with international collaborators, explores how neutrons in fusion reactors could generate axions, potentially advancing our understanding of dark matter, and adds a real-world scientific breakthrough to a concept previously only discussed in the sitcom.
Scientists propose a model where the universe could stop expanding and collapse into a Big Crunch in about 20 billion years, based on new data suggesting dark energy might be changing over time and a potential negative cosmological constant, challenging the idea of eternal expansion.
Physicists suggest that due to evolving dark energy and a negative cosmological constant, the universe may eventually stop expanding and collapse in about 20 billion years, potentially leading to a Big Crunch, with axions influencing this process.
Recent research suggests that dark energy, which drives the universe's accelerated expansion, may be evolving over time rather than remaining constant, implying the existence of a new, ultra-light particle and potentially altering our understanding of the universe's future.
Researchers from the University of Copenhagen used galaxy clusters and the magnetic fields around them to search for axions, a hypothetical particle linked to dark matter. By combining data from 32 distant black holes, they identified a pattern that hints at the presence of axions, bringing us closer to understanding dark matter. This innovative method could be applied to other radiation types and help narrow down the search for these elusive particles.
Researchers used X-ray data from the NuSTAR telescope to search for axions, hypothetical particles that could be dark matter, by analyzing galaxy M82 and others. Although no axions were detected, the studies set new constraints on their properties and demonstrated the potential of galaxy observations for future dark matter searches.
A new study proposes a theoretical test to potentially falsify the Anthropic Principle, which suggests the universe is fine-tuned for life. The test involves conditions related to cosmic expansion, axions, and dark matter, though it is currently unfeasible due to gaps in scientific understanding. If proven, it could challenge the notion that the universe is purpose-built for intelligent life, suggesting more complex cosmological theories.
A new study by physicists Nemanja Kaloper and Alexander Westphal proposes a method to test the Anthropic Principle, which suggests the universe is fine-tuned for life. The researchers aim to validate this principle by examining cosmic inflation, dark matter, and axions. They suggest that if future observations, such as those from the LiteBIRD satellite or black hole studies, confirm the presence of ultralight axions as dark matter, it would support the Anthropic Principle. Conversely, if axions are not found to be dark matter, it could challenge the principle's validity.
Researchers from the University of California, Berkeley propose that gamma rays emitted from neutron stars at the center of supernova explosions could help solve the dark matter mystery if dark matter is composed of axions, hypothetical particles. A nearby supernova could allow detection of these gamma rays, potentially confirming the mass of axions and resolving the dark matter puzzle. The Fermi Gamma-ray Space Telescope would need to be pointed in the right direction to capture this event, which has a 1 in 10 chance of occurring. The team is advocating for a full-sky gamma-ray satellite constellation to ensure no such event is missed.