Improved constraints on an axion-mediated force.

Phys Rev Lett

Center for Experimental Nuclear Physics and Astrophysics, University of Washington, Seattle, Washington 98195-4290, USA.

Published: January 2011

AI Article Synopsis

Article Abstract

Low mass pseudoscalars, such as the axion, can mediate macroscopic parity and time-reversal symmetry-violating forces. We searched for such a force between polarized electrons and unpolarized atoms using a novel, magnetically unshielded torsion pendulum. We improved the laboratory bounds on this force by more than 10 orders of magnitude for pseudoscalars heavier than 1 meV and have constrained this force over a broad range of astrophysically interesting masses (10  μeV to 10 meV).

Download full-text PDF

Source
http://dx.doi.org/10.1103/PhysRevLett.106.041801DOI Listing

Publication Analysis

Top Keywords

improved constraints
4
constraints axion-mediated
4
force
4
axion-mediated force
4
force low
4
low mass
4
mass pseudoscalars
4
pseudoscalars axion
4
axion mediate
4
mediate macroscopic
4

Similar Publications

Background: Comprehensive health-related quality of life (QOL) assessment under severe respondent burden constraints requires improved single-item scales for frequently surveyed domains. This article documents how new single-item-per-domain (SIPD) QOL General (QGEN-8) measures were constructed for domains common to SF-36 and results from the first psychometric tests comparing scores for the new measure in relation to those for the SF-36 profile and summary components.

Research Design: Online NORC surveys of adults, ages 19-93 (mean=52 y) representing the US population in 2020 (N=1648) included QGEN-8 and SF-36 items measuring physical (PF), social (SF), role physical (RP) and role emotional (RE) functioning and feelings of bodily pain (BP), vitality (VT), and mental health (MH).

View Article and Find Full Text PDF

Background: Increasing healthcare costs, particularly in Low- and Middle-Income Countries (LMICs) like Egypt, highlight the need for rational economic strategies. Clinical pharmacy interventions offer potential benefits by reducing drug therapy problems and associated costs, thereby supporting healthcare system sustainability.

Objective: This study evaluates the economic impact and clinical benefits of clinical pharmacy interventions in four tertiary hospitals in Egypt by implementing an innovative tool for medication management, focusing on cost avoidance and return on investment (ROI), while accounting for case severity and drug therapy problem (DTP) resolution.

View Article and Find Full Text PDF

Efficient Second Harmonic Generation via Plasmonic-Photonic Mode Matching in Hybrid Waveguide.

Nano Lett

January 2025

School of Physics and Technology, and Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education, Wuhan University, Wuhan 430072, China.

Hybrid nonlinear plasmonic waveguides, characterized by a small mode area and large nonlinear susceptibility, present an intriguing and practical platform for the minimization of nonlinear photonic devices. Nevertheless, the intrinsic Ohmic loss associated with surface plasmon polaritons (SPPs) and modal dispersion imposes constraints on the effective interaction length and, consequently, the ultimate efficiency of nonlinear processes. In this study, we demonstrate an efficient second harmonic generation (SHG) within a hybrid plasmonic waveguide by leveraging SPP-like modes at the fundamental wave and photonic-like modes at the SHG under phase matching conditions.

View Article and Find Full Text PDF

Given the urgent need for help amongst vulnerable populations throughout the coronavirus disease 2019 (COVID-19) pandemic, civil society organizations (CSOs) and members have stepped up to provide support for impacted communities. The process of responding to these urgent needs reflects the agency and resilience of civil society members in accessing or providing resources. There is still a lack of understanding of how human agency is exercised in the context of power imbalances.

View Article and Find Full Text PDF

Brain-inspired wiring economics for artificial neural networks.

PNAS Nexus

January 2025

School of Physical Science and Engineering, Tongji University, Shanghai 200092, P. R. China.

Wiring patterns of brain networks embody a trade-off between information transmission, geometric constraints, and metabolic cost, all of which must be balanced to meet functional needs. Geometry and wiring economy are crucial in the development of brains, but their impact on artificial neural networks (ANNs) remains little understood. Here, we adopt a wiring cost-controlled training framework that simultaneously optimizes wiring efficiency and task performance during structural evolution of sparse ANNs whose nodes are located at arbitrary but fixed positions.

View Article and Find Full Text PDF

Want AI Summaries of new PubMed Abstracts delivered to your In-box?

Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!