Tag

Physical Review Letters

All articles tagged with #physical review letters

space-and-spaceflight4 days ago•16 min saved

Sharp Gamma-Ray Hint Sparks Fresh Dark Matter Debate

A Chinese Academy of Sciences team reports a sharp gamma-ray line in 15.5 years of Fermi Gamma-ray Space Telescope data, arguing it provides strong direct evidence for dark matter in the form of weakly interacting massive particles (WIMPs). The authors say the signal fits expectations for WIMP annihilation, but gamma-ray lines can arise from instrumental or astrophysical sources, so confirmation will require further data and independent verification as new gamma-ray observatories come online.

via Gizmodo|

#dark-matter #fermi-gamma-ray-space-telescope #gamma-rays

space3 months ago•73 min saved

Listening for Darkness: Could Gravitational Waves Reveal Dark Matter's Signature

A new study proposes that dense dark-matter clouds around spinning black holes could imprint a detectable signal on gravitational waves produced by merging black holes. Researchers analyzed 28 LIGO/Virgo/KAGRA events and found one—GW190728—whose waveform may carry such an imprint, though not a definitive detection. If true, this could provide a new way to probe dark matter using upcoming gravitational-wave observations and detector improvements, with the results published in Physical Review Letters.

via Space|

#black-holes #dark-matter #gravitational-waves

science6 months ago•5 min saved

Two Beads, One Standing Wave: A Lab-Scale Time Crystal

NYU researchers demonstrate a classical time crystal using an acoustic standing-wave field to levitate and couple tiny polystyrene beads; through non-reciprocal scattering of sound, the beads self-sustain a temporal oscillation without external driving, making it the simplest possible time-crystal system and offering a macroscopic platform to study non-reciprocity. The findings are reported in Physical Review Letters.

via ScienceAlert|

#acoustic-levitation #non-reciprocal-interaction #physical-review-letters

physics2 years ago•2 min saved

"Discovery of a Novel Subatomic Particle Confirmed"

The BESIII collaboration has observed an anomalous line shape around the ppbar mass threshold in the J/ψ→γ3(π+π-) decay, indicating the existence of a ppbar bound state, with a new resonance X(1880) discovered near the ppbar mass threshold. The mass and width of X(1880) were determined to be 1882.1±1.7±0.7 MeV/c2 and 30.7±5.5±2.4 MeV/c, respectively, supporting the existence of a ppbar bound state. This result was published in Physical Review Letters and selected as "Featured in Physics."

via Phys.org|

#besiii-collaboration #nucleon-antinucleon-bound-state #physical-review-letters