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All articles tagged with #physics

CERN Detects Excited Bc*+ Meson at the LHC
physics7 hours ago

CERN Detects Excited Bc*+ Meson at the LHC

ATLAS physicists at CERN observed the excited Bc*+ meson, a heavy-quark bound state (charm quark with a bottom antiquark), produced in high-energy proton-proton collisions at the LHC. The Bc*+ rapidly decays to a Bc+ meson and a photon, which was identified indirectly when the photon converted into an electron–positron pair in the detector. The measured mass difference between Bc*+ and Bc+ is 64.5 ± 1.4 MeV, consistent with theoretical expectations and providing new data to refine models of heavy-quark dynamics and the strong force. Publication is set for Physical Review Letters.

via Sci.News|
#atlas-collaboration#bc-meson#large-hadron-collider
Four-Dimensional Ghost Unmasked in CERN's SPS
science8 days ago

Four-Dimensional Ghost Unmasked in CERN's SPS

Physicists at CERN traced a time-evolving resonance inside the Super Proton Synchrotron (SPS) that quietly degrades particle beams. Using a four-dimensional Poincaré surface-of-section, they map fixed harmonic lines that predict where particles cluster, revealing the hidden ‘ghost’ and offering strategies to dampen its effects and guide the design of future accelerators.

via Indian Defence Review|
#accelerator#beam-degradation#cern
Physicists Divide on the Cosmos: A Major Survey Finds Little Consensus
science11 days ago

Physicists Divide on the Cosmos: A Major Survey Finds Little Consensus

A large American Physical Society survey of 1,600+ physicists and science enthusiasts reveals broad disagreement on core cosmology topics. While 68% view the Big Bang as a hot, dense state (not necessarily a definite beginning), 20% see it as the absolute beginning with a singularity. On dark matter, only 10% endorse the traditional WIMP view, with about 21% proposing a hybrid of ideas, and on dark energy, 24% see it as a constant while 26% think it evolves over time, per DESI. The results highlight that scientific consensus is tenuous and progress comes from continued testing and debate.

via Futurism|
#cosmology#dark-energy#dark-matter
Gravitational Waves as a Probe for Dark Matter around Black Holes
science12 days ago

Gravitational Waves as a Probe for Dark Matter around Black Holes

MIT and European researchers developed a numerical model predicting how black-hole mergers would imprint dark matter on gravitational waves. When applied to LVK data, 27 of 28 clearest events matched vacuum expectations, while GW190728 showed a possible dark-matter imprint—though not a confirmed detection. The method provides a new way to screen for dark-matter signatures in gravitational waves for follow-up studies.

via MIT News|
#astrophysics#black-holes#dark-matter
Gears Without Teeth: Fluid Flows Spin Rotors in a Noncontact Engine
science1 month ago

Gears Without Teeth: Fluid Flows Spin Rotors in a Noncontact Engine

NYU researchers demonstrate fluid-driven gear-like coupling: two submerged rotors in a glycerol–water mix generate motion in a passive rotor via controlled liquid flows. By adjusting distance and rotation speed, the system can mimic interlocking gears (opposite directions) or belt-and-pulley systems (same direction), offering a tunable, noncontact alternative to traditional gears. Published in Physical Review Letters with NSF support.

via SciTechDaily|
#fluid-dynamics#mechanical-engineering#noncontact-gearing
Birth of quantum entanglement captured in attoseconds
science1 month ago

Birth of quantum entanglement captured in attoseconds

Researchers directly measured the birth of quantum entanglement on attosecond timescales by exciting atoms with intense laser pulses, showing the departure timing of one electron is linked to the energy state of the remaining electron (roughly 232 attoseconds on average). They developed a two-laser measurement protocol to capture this ultrafast entanglement, with potential implications for quantum technologies and communications.

via Earth.com|
#attoseconds#physics#quantum-entanglement
Big G Remains Elusive as a Decade of Gravity Tests Clash with CODATA
physics1 month ago

Big G Remains Elusive as a Decade of Gravity Tests Clash with CODATA

After a decade of cross‑Atlantic replication led by NIST, the new measurement of the gravitational constant G disagrees with both the 2013 BIPM result and CODATA’s current value, highlighting that Big G is still the least precisely known fundamental constant and that the true value remains unresolved despite improved methods (including a blinded measurement to reduce bias).

via Nature|
#bigg#bipm#gravitationalconstant
Vacuum spawns matter: particles emerge from empty space in collider experiments
science1 month ago

Vacuum spawns matter: particles emerge from empty space in collider experiments

In high-energy proton collisions, scientists observed particle pairs emerging directly from the vacuum, with correlated spins that persist through short-lived decays, suggesting vacuum fluctuations contribute to the mass and structure of visible matter. Data from Brookhaven’s RHIC using the STAR detector point to vacuum as an active source of matter, offering a new way to study how vacuum structure, spin, and mass generation are connected, while further tests at different energies are planned.

via Earth.com|
#mass-origin#particle-physics#physics
Water's Hidden Critical Point Revealed: Evidence of a Dual-Liquid Phase in Supercooled Water
science1 month ago

Water's Hidden Critical Point Revealed: Evidence of a Dual-Liquid Phase in Supercooled Water

Scientists report new evidence for a hidden critical point in supercooled water, supporting a liquid-liquid transition between high- and low-density forms and revealing a slowed, critical region near -63°C at around 1000 atm. Using rapid heating and ultra-fast X-ray snapshots, researchers observed the transition before freezing, narrowing the boundary of this mysterious state and enhancing our understanding of water’s peculiar behavior and its broader implications.

via ScienceAlert|
#critical-point#liquid-liquid-transition#physics
Death as Reorganization: Physics Says You Don’t Vanish
science2 months ago

Death as Reorganization: Physics Says You Don’t Vanish

Physics says when you die, your atoms don’t vanish; they disperse into soil, air and other living systems, while the pattern that defined you—the brain’s arrangement of those atoms—unravels as energy flow ceases. Memories and personality are tied to this arrangement, not to any single atom, so personal identity ends even as matter persists and recycles throughout the universe.

via Yahoo|
#atoms#consciousness#death
Researchers Reveal Rich 48-Dimensional Topology Inside Entangled Photons
physics2 months ago

Researchers Reveal Rich 48-Dimensional Topology Inside Entangled Photons

Researchers at the University of the Witwatersrand and collaborators demonstrated that entangled photons carry a hidden, high-dimensional topology—up to 48 dimensions—with over 17,000 distinct signatures. This topology arises from a single property of light, its orbital angular momentum, enabling a new high-dimensional encoding scheme for quantum information. Because OAM spans many values, the resulting topology can be very rich, and the effect can be observed using standard SPDC lab setups, potentially improving the robustness of future quantum technologies.

via ScienceDaily|
#high-dimensional-states#orbital-angular-momentum#photonics
Consciousness as the Hidden Ground of Physics
science2 months ago

Consciousness as the Hidden Ground of Physics

Harald A. Wiltsche argues that physics cannot escape phenomenology: objectivity in physics is not detachment from observers but invariance across frames, achieved through transformation rules; perceptual objectivity shows how our experiences and anticipations about objects from different perspectives ground physical knowledge, meaning the subject–object correlation has always underpinned physics and must be embraced to advance science.

via IAI TV|
#consciousness#objectivity#observer
Lightning in a Box Could Shrink Thunderstorms to Tabletop Size
science2 months ago

Lightning in a Box Could Shrink Thunderstorms to Tabletop Size

Penn State researchers propose a tiny, deck-of-cards-sized solid block that could replicate the electrical conditions of a thunderstorm, triggering lightning‑like radiation via a relativistic runaway electron avalanche. The “lightning‑in‑a‑box” is theoretical for now and would require experimental confirmation with common insulating materials; if proven feasible, it could let scientists study lightning at desktop scale, reducing the cost and scale of traditional field experiments.

via Gizmodo|
#atmospheric-science#high-energy#laboratory-research