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Safety profiling of technical lignins originating from various bioresources and conversion processes.
Heliyon
June 2024
Institut National de l'Environnement Industriel et des Risques (Ineris), Parc Technologique Alata, 60550 Verneuil-en-Halatte, France.
In this work, a set of eight technical lignin samples from various botanical origins and production processes were characterized for their chemical composition, higher heating value, size distribution, dust explosion sensitivity and severity, thermal hazard characteristics and biodegradability, in further support of their sustainable use. More specifically, safety-focused parameters have been assessed in terms of consistency with relating physico-chemical properties determined for the whole set of technical lignins. The results emphasized the heterogeneity and variability of technical lignins and the subsequent need for a comprehensive characterization of new lignin feedstocks arising from novel biorefineries.
View Article and Find Full Text PDFProbing the Dark Sector with Nuclear Transition Photons.
Phys Rev Lett
September 2023
ARC Centre of Excellence for Dark Matter Particle Physics, School of Physics, The University of Melbourne, Victoria 3010, Australia.
Here we present world-leading sensitivity to light (<170 MeV) dark matter (DM) using beam-dump experiments. Dark sector particles produced during pion decay at accelerator beam dumps can be detected via scattering in neutrino detectors. The decay of nuclei excited by the inelastic scattering of DM is an unexploited channel which has significantly better sensitivity than similar searches using the elastic scattering channel.
View Article and Find Full Text PDFPrethermalization in one-dimensional quantum many-body systems with confinement.
Nat Commun
December 2022
Department of Physics, Technical University of Munich, 85748, Garching, Germany.
Unconventional nonequilibrium phases with restricted correlation spreading and slow entanglement growth have been proposed to emerge in systems with confined excitations, calling their thermalization dynamics into question. Here, we show that in confined systems the thermalization dynamics after a quantum quench instead exhibits multiple stages with well separated time scales. As an example, we consider the confined Ising spin chain, in which domain walls in the ordered phase form bound states reminiscent of mesons.
View Article and Find Full Text PDFResonant Self-Interacting Dark Matter from Dark QCD.
Phys Rev Lett
April 2022
Department of Physics, University of California, Berkeley, California 94720, USA.
We present new models utilizing QCD-like dark sectors to resolve small-scale structure problems. These models of resonant self-interacting dark matter in a dark sector with QCD are based on analogies to the meson spectra in standard model QCD. We introduce a simple model that realizes resonant self-interaction (analogous to the ϕ-K-K system) and thermal freeze-out, in which dark mesons are made of two light quarks.
View Article and Find Full Text PDFBreakdown of Chiral Perturbation Theory for the Axion Hot Dark Matter Bound.
Phys Rev Lett
June 2021
IJCLab, Pôle Théorie (Bâtiment 210), CNRS/IN2P3 et Université Paris-Saclay, 91405 Orsay, France.
We show that the commonly adopted hot dark matter bound on the axion mass m_{a}≲1 eV is not reliable, since it is obtained by extrapolating the chiral expansion in a region where the effective field theory breaks down. This is explicitly shown via the calculation of the axion-pion thermalization rate at the next-to-leading order in chiral perturbation theory. We finally advocate a strategy for a sound extraction of the axion hot dark matter bound via lattice QCD techniques.
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