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Hyperons in neutron stars: studies of hyperon spectroscopy and the hyperon-nucleon interaction with the K-long Facility.
Philos Trans A Math Phys Eng Sci
July 2024
School of Physics Engineering and Technology, University of York, York YO10 5DD, UK.
Elucidating the role of strange baryons (hyperons) in neutron stars requires detailed knowledge of hyperon-nucleon interactions in the light (u,d,s) quark sector. The structure of the hyperons and their excitation spectra also directly impact, and are an input to, models of big-bang nucleosynthesis. The upcoming K-long Facility will provide a much-needed intense and clean neutral strange meson beam, from which hyperons can be produced at rates where hyperon structure, hyperon-nucleon interactions and higher-order interactions can be studied with a new level of accuracy and for hitherto unreachable measurements.
View Article and Find Full Text PDFTransition between Heavy-Fermion-Strange-Metal and Quantum Spin Liquid in a 4d-Electron Trimer Lattice.
Phys Rev Lett
May 2024
Department of Physics, University of Colorado at Boulder, Boulder, Colorado 80309, USA.
We present experimental evidence that a heavy Fermi surface consisting of itinerant, charge-neutral spinons underpins both heavy-fermion-strange-metal (without f electrons) and quantum-spin-liquid states in the 4d-electron trimer lattice, Ba_{4}Nb_{1-x}Ru_{3+x}O_{12}(|x|<0.20). These two exotic states both exhibit an extraordinarily large entropy, a linear heat capacity extending into the milli-Kelvin regime, a linear thermal conductivity at low temperatures, and separation of charges and spins.
View Article and Find Full Text PDFNeuronal population representation of human emotional memory.
Cell Rep
April 2024
Laboratory for Clinical Neuroscience, Center for Biomedical Technology, Universidad Politécnica de Madrid, IdISSC, Madrid, Spain; Reina Sofia Centre for Alzheimer's Research, Madrid, Spain.
Understanding how emotional processing modulates learning and memory is crucial for the treatment of neuropsychiatric disorders characterized by emotional memory dysfunction. We investigate how human medial temporal lobe (MTL) neurons support emotional memory by recording spiking activity from the hippocampus, amygdala, and entorhinal cortex during encoding and recognition sessions of an emotional memory task in patients with pharmaco-resistant epilepsy. Our findings reveal distinct representations for both remembered compared to forgotten and emotional compared to neutral scenes in single units and MTL population spiking activity.
View Article and Find Full Text PDFCritical Reflexivity and Positionality on the Scholar-Practitioner Continuum: Researching Women's Embodied Subjectivities in Sport.
Sports (Basel)
October 2023
School of Education, University of Strathclyde, Glasgow G1 1XQ, UK.
The sports world has many prejudices that have been converted into common sense. Some relate to the idea of athletes being strong or pretty but endowed with little intelligence. There is another view, perhaps a little more accurate, around the reification of consciousness in the name of the automation and maximum outcome of the body.
View Article and Find Full Text PDFContinuous irregular dynamics with multiple neutral trajectories permit species coexistence in competitive communities.
Theor Popul Biol
February 2023
Graduate School of Science, Osaka Metropolitan University, Japan.
Article Synopsis
- The colonization model highlights that various species can coexist through competition for habitable sites, based on how propagules encounter those sites.
- Traditional assumptions indicate that species distribution can reach an equilibrium state, but varying encounter processes reveal different dynamics.
- The study found that species frequencies show continuous variation and are influenced by initial conditions, resulting in unique patterns termed "strange nonchaotic attractors" (SNAs), suggesting complex competitiveness among species even in a stable environment.
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