A5081197305- Dark Matter and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Atomic and Subatomic Physics Research
- Particle physics theoretical and experimental studies
- Cold Atom Physics and Bose-Einstein Condensates
- Neutrino Physics Research
- Galaxies: Formation, Evolution, Phenomena
- Geotechnical Engineering and Underground Structures
- Planetary Science and Exploration
- Probabilistic and Robust Engineering Design
- Structural Engineering and Vibration Analysis
- Astro and Planetary Science
- Quantum, superfluid, helium dynamics
- Advanced Thermodynamics and Statistical Mechanics
- Non-Destructive Testing Techniques
- Dam Engineering and Safety
- Water Systems and Optimization
- Power Line Inspection Robots
- Quantum optics and atomic interactions
- Asphalt Pavement Performance Evaluation
- Hydraulic flow and structures
- Transportation Safety and Impact Analysis
- Pulsars and Gravitational Waves Research
- Concrete Corrosion and Durability
- Polar Research and Ecology
Kavli Institute for the Physics and Mathematics of the Universe
2024
The University of Tokyo
2024
SLAC National Accelerator Laboratory
2020-2023
Kavli Institute for Particle Astrophysics and Cosmology
2020-2023
Stanford University
2020-2023
Menlo School
2023
University of Washington
2017-2018
Pioneer (United States)
1990-1991
University of California, San Diego
1961
The coherent elastic scattering of neutrinos off nuclei has eluded detection for four decades, even though its predicted cross section is by far the largest all low-energy neutrino couplings. This mode interaction offers new opportunities to study properties and leads a miniaturization detector size, with potential technological applications. We observed this process at 6.7σ confidence level, using low-background, 14.6-kilogram CsI[Na] scintillator exposed emissions from Spallation Neutron...
Ultralight dark matter (ULDM) is usually taken to be a single scalar field. Here we explore the possibility that ULDM consists of $N$ light fields with only gravitational interactions. This configuration more consistent underlying particle physics motivations for these scenarios than ultralight halos have characteristic granular structure increases stellar velocity dispersion and can used as observational constraints on models. In multifield simulations, find inside halo amplitude total...
The classical field approximation is widely used to better understand the predictions of ultralight dark matter. Here, we use truncated Wigner method test This approximates a quantum state as an ensemble independently evolving realizations drawn from its function. highly parallelizable and allows direct simulation corrections decoherence times in systems many larger than have been previously studied reference Our study involves 1, 2, 3 spatial dimensions. We simulate three systems,...
Ne 20 , 21 and 22 has been measured in several stone meteorites. Good agreement with other cosmic ray produced rare gas isotopes was obtained. No indication of primeval neon found the chondrites, but one urelite showed excess .
We test the degree to which interacting Bosonic systems can be approximated by a classical field as total occupation number is increased. This done with our publicly available code repository, QIBS, new massively parallel solver for these systems. use of toy models well studied in literature and track when description admits quantum corrections, called breaktime. allows us claims regarding rate convergence evolution. initial conditions, including coherent states, eigenstates, states. find...
We explore the use of field solvers as approximations classical Vlasov-Poisson systems. This correspondence is investigated in both electrostatic and gravitational contexts. demonstrate ability to be excellent problems with cold initial condition into nonlinear regime. also investigate extensions Schr\"odinger-Poisson system that employ multiple stacked streams, von Neumann--Poisson equation methods can successfully reproduce evolution warm conditions. then discuss how appropriate simulation...
We investigate the timescale on which quantum corrections alter predictions of classical field theory for scalar dark matter. This is accomplished by including second order terms in evolution proportional to covariance operators. When this no longer small compared mean value, we say that system has reached ``quantum breaktime" and will begin differ from those full theory. While holding fixed, determine change breaktime as total occupation number increased. provides a novel numerical...
The paper describes failures, their investigations, and repair of a 108‐in. diameter buried steel water conduit. Several circumferential breaks occurred in bells presence longitudinal temperature stresses, numerous defects caused by substandard pipe fabricating methods poor erection practices. Litigations that followed involved number experts whose reports often contained conflicting opinions. purpose this is to present all the aspects technical controversy describe used. An assessment AWWA...
We introduce a numerical method and python package, chimes, that simulates quantum systems initially well approximated by mean field theory using second order extension of the classical approach. call this moment expansion method. In way, we can accurately approximate evolution first moments beyond where breaks down. This allows us to estimate break time approximation without any calculations external theory. investigate accuracy number studied test problems. Interacting bosonic similar...
The study of ultralight dark matter helps constrain the lower bound on minimally coupled models. granular structure density fields produces metric perturbations which have been identified as a potentially interesting probe this model. For masses $m \gtrsim 10^{-17} \, \mathrm{eV}$ these would fluctuate timescales similar to observational timescales. In paper, we estimate expected time delay fluctuations generate in simulated pulsar signals. We simulate arrays mock pulsars fluctuating field....
Penstock design and construction in the United States have been guided to a large extent by ASME Code for Unfired Pressure Vessels. At same time, penstock practice often deviates from latter, particularly critical area of allowable working stresses. As result, safety standards are far being uniform. A study three foreign codes brings out certain advantages separate this specialized field. It also suggests use higher stresses penstocks than those permitted Code. The contents listed their more...
Scalar field dark matter offers an interesting alternative to the traditional WIMP picture. Astrophysical and cosmological simulations are useful constraining mass of particle in this model. This is particularly true at low where wavelike nature manifests on astrophysical scales. These typical use a classical approximation. In work, we look extending these include quantum corrections. We into both ways which large corrections impact predictions scalar matter, timescales grow large....
The COHERENT Collaboration is realizing a long term neutrino physics research program. main goals of the program are to detect and study elastic neutrino-nucleus scattering (CEνNS). This process predicted by Standard Model but it has never been observed experimentally because very low energy recoil nucleus. using different detector technologies: CsI[Na] NaI scintillator crystals, single-phase liquid Ar Ge detectors. placement all setups in basement Spallation Neutron Source (SNS) at Oak...
Unusually large 50-ft-wide by 65-ft-high tainter gates in the Wanapum Project led to search for an economical way of anchoring 7,560 kips thrust into pier. A heavily reinforced concrete block supporting gate trunnions and anchored with fourteen prestressed cables, each 635 kip capacity, provided answer. Because complicated three dimensional state stress inside anchor monolithic construction pier, extensive structural model tests were necessary. Aluminum models (stress coat strain gages) a...
Ultralight dark matter (ULDM) is usually taken to be a single scalar field. Here we explore the possibility that ULDM consists of $N$ light fields with only gravitational interactions. This configuration more consistent underlying particle physics motivations for these scenarios than ultralight halos have characteristic granular structure increases stellar velocity dispersion and can used as observational constraints on models. In multifield simulations, find inside halo amplitude total...
The classical field approximation is widely used to better understand the predictions of ultra-light dark matter. Here, we use truncated Wigner method test This approximates a quantum state as an ensemble independently evolving realizations drawn from its function. highly parallelizable and allows direct simulation corrections decoherence times in systems many larger than have been previously studied reference Our study involves 1, 2, 3 spatial dimensions. We simulate three systems,...
Design of power features hydroelectric development National Power Corp Philippines; outstanding feature station is horizontal shaft setting generating units; intake in form tower valve chamber; chamber, access, surge tailrace tunnel, generators, transformers, administration building, engineering and construction detailed.