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CERN Detects Excited Bc*+ Meson at the LHC
10 hours ago•Source: Sci.News
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5.99 min•1 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).
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Researchers Reveal Rich 48-Dimensional Topology Inside Entangled Photons
ScienceDaily•2 months ago
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Decoding Quantum Chaos with a Single Scramblon
American Physical Society•3 months ago
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Graphene bilayers reveal a reversible superfluid-to-supersolid transition in excitons
Physicists using two closely spaced graphene layers, a strong magnetic field, and ultracold temperatures observed bilayer excitons transition from a superfluid to an insulating, lattice-like state (interpreted as a supersolid) and then revert back to a superfluid, marking the first reported reversible superfluid-to-supersolid transition in this system in a Nature study led by Cory Dean and colleagues.
Emergent Topology Arises in Quantum-Critical CeRu4Sn6
Researchers at TU Wien report that the quantum material CeRu4Sn6 enters a quantum-critical regime at ultra-low temperatures where electrons lose their particle-like character, yet the system hosts an emergent topological semimetal state. They observed a spontaneous (anomalous) Hall effect without an external magnetic field, linking quantum fluctuations to topology and suggesting that topological properties can arise even when the conventional particle-picture fails. The work also points to a generalized, emergent view of topology and proposes focusing on quantum-critical materials to discover new topological phases.
Mapping Interaction Effects on Quantum Hall Edge States
The article discusses the visualization and analysis of interaction-driven restructuring of quantum Hall edge states in graphene using advanced scanning tunneling microscopy techniques, providing insights into the topological and electronic properties of these states.
Precision Spectroscopy Highlights Discrepancies Between Theory and Experiment
Recent high-precision spectroscopy experiments on helium isotopes reaffirm a significant discrepancy between theoretical calculations and experimental measurements of the ionization energy of the helium-3 and helium-4 triplet states, suggesting potential new physics or unknown interactions affecting only the triplet spectrum.
Space-Time Singularities: Persistent and Resilient
Physicists are exploring the nature of singularities—points where space and time break down—predicted by Einstein's general relativity, and recent research suggests these may be more than mathematical artifacts, potentially existing in black holes and the early universe, challenging the quest for a complete quantum theory of gravity.
Record-Breaking Cosmic Ray Electrons Detected Near Earth
The H.E.S.S. Collaboration has extended the measurement of cosmic-ray electron and positron spectra to 40 TeV, revealing a significant spectral break at 1 TeV. This breakthrough challenges existing models of cosmic-ray origins and propagation, suggesting that local sources like pulsars or supernova remnants may play a role. The findings also constrain the potential contribution of dark matter annihilation to the cosmic-ray flux, prompting a reevaluation of cosmic-ray acceleration models.
New Symmetry Discovered in Statistical Mechanics
Researchers have discovered a new type of symmetry in statistical mechanics, identified as a gauge transformation, which leaves microstates and observable properties unchanged. This finding, by Matthias Schmidt and colleagues, offers a unified framework for deriving and verifying hyperforce relations, potentially leading to more efficient computational methods in molecular simulations. The study highlights the role of gauge invariance in understanding the collective behavior of particle systems and its implications for future research in both equilibrium and dynamic properties.
Unveiling the Mysteries of the Neutrino Fog
Two dark matter experiments, PandaX and XENON, have detected signals from solar neutrinos, known as the "neutrino fog," which could complicate future dark matter searches. These experiments, using liquid xenon detectors, observed coherent elastic neutrino-nucleus scattering (CEvNS) events, a process predicted to mimic dark matter signals. While the neutrino fog poses a potential challenge, it is not expected to significantly impact dark matter searches for at least a decade. The findings also open new avenues for neutrino research and standard-model testing.
"Chiral Electron Paths: A Twist in Physics Revolutionizing Technology"
Researchers in Germany have successfully sent single electrons along structured chiral paths, achieving chirality in electron matter waves without angular momentum. This work, which parallels earlier research with photons, could have significant applications in electron microscopy and the study of magnetic materials. However, some scientists are skeptical about the claim of chirality without angular momentum and the lack of citation of previous related work.
"Advancements in Neutrino Mass Determination: Closer to Unraveling the Mystery"
Researchers have made a significant contribution to determining the mass of neutrinos, a fundamental yet elusive aspect of particle physics, by using a Penning trap to measure the change in mass of a holmium-163 isotope with extreme precision. This method allows for the determination of the Q value 50 times more accurately than before, potentially revealing systematic errors in the determination of the neutrino mass. The findings offer a major step forward in understanding the mysterious neutrino masses and the potential existence of new physics beyond the standard model.