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Stringent Tests of Lorentz Invariance Violation from LHAASO Observations of GRB 221009A.
Phys Rev Lett
August 2024
Key Laboratory of Particle Astrophysics and Experimental Physics Division and Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, 100049 Beijing, China.
Article Synopsis
- - On October 9, 2022, LHAASO detected a significant afterglow from the gamma-ray burst 221009A, achieving record photon statistics in the TeV energy range.
- - This observation allowed researchers to test the idea of Lorentz invariance violation (LIV), which is related to faster-than-light travel predictions in some quantum gravity theories.
- - The study established that the energy scales for LIV effects are significantly higher than previously thought, with new lower limits being 10 times the Planck energy for linear effects and 6×10^{-8} times the Planck energy for quadratic effects, improving earlier constraints by 5-7 times.
Impact of Multi-Scattered LiDAR Returns in Fog.
Sensors (Basel)
August 2024
Institute for Laser Technologies in Medicine and Metrology at the University of Ulm (ILM), D-89081 Ulm, Germany.
In the context of autonomous driving, the augmentation of existing data through simulations provides an elegant solution to the challenge of capturing the full range of adverse weather conditions in training datasets. However, existing physics-based augmentation models typically rely on single scattering approximations to predict light propagation under unfavorable conditions, such as fog. This can prevent the reproduction of important signal characteristics encountered in a real-world environment.
View Article and Find Full Text PDFGuidelines for fracture risk assessment and management of osteoporosis in postmenopausal women and men above the age of 50 in Qatar.
Arch Osteoporos
May 2024
Rheumatology Section, Department of Medicine, Hamad Medical Corporation, Doha, Qatar.
Unlabelled: We present comprehensive guidelines for osteoporosis management in Qatar. Formulated by the Qatar Osteoporosis Association, the guidelines recommend the age-dependent Qatar fracture risk assessment tool for screening, emphasizing risk-based treatment strategies and discouraging routine dual-energy X-ray scans. They offer a vital resource for physicians managing osteoporosis and fragility fractures nationwide.
View Article and Find Full Text PDFSpectral Hong-Ou-Mandel Effect between a Heralded Single-Photon State and a Thermal Field: Multiphoton Contamination and the Nonclassicality Threshold.
Phys Rev Lett
December 2023
Institute of Photonics, Leibniz University Hannover, 30167 Hannover, Germany.
The Hong-Ou-Mandel (HOM) effect is crucial for quantum information processing, and its visibility determines the system's quantum-classical characteristics. In an experimental and theoretical study of the spectral HOM effect between a thermal field and a heralded single-photon state, we demonstrate that the HOM visibility varies dependent on the relative photon statistics of the interacting fields. Our findings reveal that multiphoton components in a heralded state get engaged in quantum interference with a thermal field, resulting in improved visibilities at certain mean photon numbers.
View Article and Find Full Text PDFDecoherence and Turbulence Sources in a Long Laser.
Phys Rev Lett
August 2023
Université Côte d'Azur, CNRS, INPHYNI, 06200 Nice, France.
We investigate the turn-on process in a laser cavity where the round-trip time is several orders of magnitude greater than the active medium timescales. In this long delay limit, we show that the universal evolution of the photon statistics from thermal to Poissonian distribution involves the emergence of power dropouts. While the largest number of these dropouts vanish after a few round-trips, some of them persist and seed coherent structures similar to dark solitons or Nozaki-Bekki holes described by the complex Ginzburg-Landau equation.
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