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Physicists report strongest evidence yet for the gluon-only glueball
13 days ago•Source: Nature
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8.17 min•14 days ago
Memory-Driven Theory Links Consecutive Rare Events
A new analytical framework shows that long-term memory in stochastic systems creates correlations between successive rare events and shifts the waiting-time distribution away from exponential, breaking the Arrhenius-Kramers paradigm. Biswas and Guérin's generalized Langevin approach reveals how power-law memory slows relaxation, producing event clustering and enabling parameter-free predictions of the full first-passage-time distribution from equilibrium measurements. The work has implications for climate risk, earthquakes, finance, and single-molecule experiments, offering a predictive theory of extreme events beyond memoryless models.
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Photonic Yang–Mills Electric Field Triggers Zitterbewegung and Bloch Oscillations
American Physical Society•28 days ago
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Competing Material Memories: Directional and Amplitude Cues in Suspensions
Neuroscience News•29 days ago
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Hidden Synchrony: Two Quantum Clocks Align via Dissipation in Trapped Ions
Physicists demonstrated synchronization between two quantum van der Pol oscillators realized as shared vibrational modes in a trapped-ion pair. The fixed relative phase emerges only in the joint state, not in either oscillator alone, thanks to engineered gain/loss processes and a collective dissipative channel. This hidden synchronization, detected through joint Wigner-function maps, points toward scalable quantum oscillator networks with potential uses in quantum sensors and clocks beyond classical limits.
Bootstrapping String Theory: From Minimal Constraints to a Unique High-Energy Description
A bootstrap analysis shows that, under ultrasoft high-energy behavior and the assumption that Regge zeros are the only zeros, the 4- and 5-point scattering amplitudes for identical scalars are uniquely fixed to the string-theory form, implying string dynamics may emerge from fundamental consistency principles rather than being assumed a priori. Built on Lorentz invariance, crossing symmetry, positivity, and analyticity, the result supports string universality but depends on whether these inputs can be independently justified or if other assumptions yield the same outcome.
Cutting a Photon Unveils a Cloud of Zero-to-Infinity States
Physicists simulated slicing a single photon with a shutter and found that the global quantum state becomes a complex mixture spanning zero to infinitely many photons. Locally, measurements on one side can reveal a single-photon state while the other side appears as vacuum, illustrating a paradoxical, nonlocal distribution and raising questions about the nature of particles and causality. The work, reported in Physical Review Letters, could lead to a clearer way to describe particle interactions and extend to other quantum particles like electrons; in realistic setups the infinite case requires an idealized infinitely fast shutter.
First functional thorium nuclear clock hints at new physics
Scientists report the first functioning thorium-229 nuclear clock, which uses a low-energy nuclear transition excited by UV lasers and operates continuously in a crystal at room temperature. The clock promises long-term stability that could surpass some optical clocks, enabling tests of fundamental forces beyond the Standard Model and offering a new avenue to search for dark matter, with potential future uses in navigation and communications as the technology matures.
JUNO sharpens neutrino-oscillation picture, edging toward mass hierarchy
With about two months of data, the Jiangmen Underground Neutrino Observatory (JUNO) measured two key reactor-neutrino oscillation parameters with 1.6× better precision than decades of previous experiments. The results, published in Nature, advance the effort to determine the neutrino mass ordering and shed light on the origin of neutrino masses, using a 20,000‑ton scintillator detector instrumented with 43,000 photomultiplier tubes observing reactor antineutrinos ~53 km away.
Antihydrogen hyperfine splitting measured to 4 ppm, tightening CPT tests and antimatter structure probes
A CERN ALPHA Collaboration study reports a four-parts-per-million measurement of the antihydrogen ground-state hyperfine splitting (a1S/h) using microwave spectroscopy on ~24,000 trapped anti-atoms in a flattened 1 T magnetic trap. By comparing two spin-flip transitions at magnetic minimums in 1.03 T and 1.07 T, the team determines a1S/h = 1,420,404.8 ± 1.1 (stat) ± 5.6 (sys) kHz, consistent with hydrogen and CPT invariance. The result probes the antiproton’s internal structure (Zemach corrections) at ~40 ppm and complements ongoing 1S–2S measurements, with future plans to push precision further (e.g., Sternheim interval, 0.65 T transitions). Achieving this precision relies on improved magnetic-field control, spin-state manipulation, and antihydrogen accumulation, as well as careful handling of magnetic-field drift and lineshape modeling.
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.
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).
Dirac Fluid Emerges in Graphene, Defying a Core Law of Metals
Scientists observed a Dirac fluid in ultraclean graphene where electrons flow like a nearly frictionless liquid at the Dirac point, causing heat and charge transport to decouple and violating the Wiedemann-Franz law by over 200x, revealing universal quantum behavior and offering a new platform for exploring extreme-physics phenomena.
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.