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Low-vibration cryogenic test facility for next generation of ground-based gravitational-wave observatories.
Rev Sci Instrum
January 2025
OzGrav-ANU, ARC Centre for Gravitational Astrophysics, College of Science, The Australian National University, Canberra ACT2601, Australia.
We present the design and commissioning of a cryogenic low-vibration test facility that measures displacement noise from a gram-scale silicon cantilever at the level of 10-16m/Hz at 1 kHz. This sensitivity is necessary for future tests of thermal noise models on cross sections of silicon suspension samples proposed for future gravitational-wave detectors. A volume of ∼36 l is enclosed by radiation shields cooling an optical test cavity that is suspended from a multi-stage pendulum chain providing isolation from acoustic and environmental noise.
View Article and Find Full Text PDFThe Influence of Temperature Disturbance on Space Inertial Sensors.
Sensors (Basel)
October 2024
School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
The TianQin program is an independently proposed space-borne detection initiative from China. The inertial sensor, as a crucial component, is susceptible to disturbances from temperature fluctuations, the impact of which on acceleration measurements remains elusive. Therefore, a comprehensive analysis on the influence of temperature disturbance is necessary to avoid errors in acceleration measurement.
View Article and Find Full Text PDFRadiative losses and radiation-reaction effects at the first post-Newtonian order in Einstein-Cartan theory.
Eur Phys J C Part Fields
February 2024
Scuola Superiore Meridionale, Largo San Marcellino 10, 80138 Naples, Italy.
Gravitational radiation-reaction phenomena occurring in the dynamics of inspiralling compact binary systems are investigated at the first post-Newtonian order beyond the quadrupole approximation in the context of Einstein-Cartan theory, where quantum spin effects are modeled via the Weyssenhoff fluid. We exploit balance equations for the energy and angular momentum to determine the binary orbital decay until the two bodies collide. Our framework deals with both quasi-elliptic and quasi-circular trajectories, which are then smoothly connected.
View Article and Find Full Text PDFAre turbulence effects on droplet collision-coalescence a key to understanding observed rain formation in clouds?
Proc Natl Acad Sci U S A
July 2024
Stratton Park Engineering Company (SPEC) Incorporated, Boulder, CO 80301.
Rain formation is a critical factor governing the lifecycle and radiative forcing of clouds and therefore it is a key element of weather and climate. Cloud microphysics-turbulence interactions occur across a wide range of scales and are challenging to represent in atmospheric models with limited resolution. Based on past experiments and idealized numerical simulations, it has been postulated that cloud turbulence accelerates rain formation by enhancing drop collision-coalescence.
View Article and Find Full Text PDFBright Nonblinking Photoluminescence with Blinking Lifetime from a Nanocavity-Coupled Quantum Dot.
Nano Lett
February 2024
School of Physics, Wuhan National Laboratory for Optoelectronics, Institute for Quantum Science and Engineering and Hubei Key Laboratory of Gravitation and Quantum Physics, Huazhong University of Science and Technology, Wuhan 430074, P. R. China.
Colloidal quantum dots (QDs) are excellent luminescent nanomaterials for many optoelectronic applications. However, photoluminescence blinking has limited their practical use. Coupling QDs to plasmonic nanostructures shows potential in suppressing blinking.
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