J. Montgomery
A5108144087- Cosmology and Gravitation Theories
- Radio Astronomy Observations and Technology
- Dark Matter and Cosmic Phenomena
- Galaxies: Formation, Evolution, Phenomena
- Particle physics theoretical and experimental studies
- Astrophysics and Cosmic Phenomena
- Astronomy and Astrophysical Research
- Superconducting and THz Device Technology
- Solar and Space Plasma Dynamics
- Particle Accelerators and Free-Electron Lasers
- Stellar, planetary, and galactic studies
- Relativity and Gravitational Theory
- Soil Moisture and Remote Sensing
- Gamma-ray bursts and supernovae
- Paranormal Experiences and Beliefs
- Astrophysical Phenomena and Observations
- Crystallography and Radiation Phenomena
- Jungian Analytical Psychology
- Oil and Gas Production Techniques
- Geophysics and Gravity Measurements
- Seismic Waves and Analysis
- Spacecraft Design and Technology
- Advanced X-ray Imaging Techniques
- Reservoir Engineering and Simulation Methods
- Adaptive optics and wavefront sensing
McGill University
2022-2025
Stony Brook University
2025
Stanford University
1997
Atomic Weapons Establishment
1965
We present a sample-variance-limited measurement of the temperature power spectrum ($TT$) cosmic microwave background using observations $\ensuremath{\sim}1500\text{ }\text{ }{\mathrm{deg}}^{2}$ field made by SPT-3G in 2018. report multifrequency measurements at 95, 150, and 220 GHz covering angular multipole range $750\ensuremath{\le}\ensuremath{\ell}<3000$. combine this $TT$ with published polarization from 2018 observing season update their associated covariance matrix to complete...
Individual quarks and gluons at small <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mi>x</a:mi></a:math> inside an unpolarized hadron can be regarded as Bell states in which qubits the spin orbital angular momentum spaces are maximally entangled. Using machinery of quantum information science, we generalize this observation to all values <c:math xmlns:c="http://www.w3.org/1998/Math/MathML"...
We present a measurement of gravitational lensing over 1500 deg2 the Southern sky using SPT-3G temperature data at 95 GHz and 150 taken in 2018. The amplitude relative to fiducial Planck 2018 Lambda cold dark matter (ΛCDM) cosmology is found be 1.020±0.060, excluding instrumental astrophysical systematic uncertainties. conduct extensive null tests check robustness measurements, report minimum-variance combined power spectrum angular multipoles 50<L<2000, which we use constrain cosmological...
We infer the mean optical depth of a sample optically-selected galaxy clusters from Dark Energy Survey (DES) via pairwise kinematic Sunyaev-Zel'dovich (kSZ) effect. The kSZ signal between pairs drawn DES Year-3 cluster catalog is detected at $4.1 \sigma$ in cosmic microwave background (CMB) temperature maps two years observations with SPT-3G camera on South Pole Telescope. After cuts, there are 24,580 $\sim 1,400$ deg$^2$ southern sky observed by both experiments. techniques. inferred...
The detection of satellite thermal emission at millimeter wavelengths is presented using data from the 3rd-Generation receiver on South Pole Telescope (SPT-3G). This represents first reported artificial satellites wavelengths. Satellite shown to be detectable high signal-to-noise timescales as short a few tens milliseconds. An algorithm for downloading orbital information and tracking known given observer constraints time-ordered observatory pointing described. Consequences cosmological...
Abstract We forecast constraints on cosmological parameters enabled by three surveys conducted with SPT-3G, the third-generation camera South Pole Telescope. The cover separate regions of 1500, 2650, and 6000 deg 2 to different depths, in total observing 25% sky. These will be measured white noise levels roughly 2.5, 9, <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mn>12</mml:mn> <mml:mspace width="0.33em"/> <mml:mi>μ</mml:mi> <mml:mi...
Abstract Including millimeter-wave data in multiwavelength studies of the variability active galactic nuclei (AGN) can provide insights into AGN physics that are not easily accessible at other wavelengths. We demonstrate this work potential cosmic microwave background (CMB) telescopes to long-term, high-cadence monitoring over large fractions sky. report on a pilot study using from SPTpol instrument South Pole Telescope (SPT), which was designed observe CMB arcminute and larger angular...
Abstract We present the first measurements of asteroids in millimeter wavelength data from South Pole Telescope (SPT), which is used primarily to study cosmic microwave background (CMB). analyze maps two ∼270 deg 2 sky regions near ecliptic plane, each observed with SPTpol camera ∼100 times over 1 month. subtract mean all a given field, removing static signal, and then average mean-subtracted at known asteroid locations. detect three asteroids—(324) Bamberga, (13) Egeria, (22) Kalliope—with...
The requirements for a seismic recording system are stated sites with noise level of the order 1 mμm displacement at frequency c/s.Two methods developed transmission electrical outputs from seismometers distributed over large array to centre in field described. first method involves direct amplified signals, and second uses amplitude modulated tones. used remotely calibrating associated amplifiers Problems lightning animal damage cables discussed.An outline instrumentation is given. signals...
In recent years, comprehensive design studies have been initiated on angstrom-wavelength free-electron laser (FEL) schemes based driving highly compressed electron bunches from a multi-GeV linac through long undulators. The output parameters of these sources, when operated in the so-called self-amplified spontaneous emission mode, include lasing powers 10-100 GW range, full transverse and low-to- moderate longitudinal coherence, pulse durations 50- 500 fs broad spectra with total power...
We present a flare star catalog from four years of non-targeted millimeter-wave survey data the South Pole Telescope (SPT). The were taken with SPT-3G camera and cover 1500-square-degree region sky $20^{h}40^{m}0^{s}$ to $3^{h}20^{m}0^{s}$ in right ascension $-42^{\circ}$ $-70^{\circ}$ declination. This was observed on nearly daily cadence 2019-2022 chosen avoid plane galaxy. A short-duration transient search this yields 111 flaring events 66 stars, increasing number both detected stars by...
Individual quarks and gluons at small-$x$ inside an unpolarized hadron can be regarded as Bell states in which qubits the spin orbital angular momentum spaces are maximally entangled. Using machinery of quantum information science, we generalize this observation to all values $0<x<1$ describe (but not quarks) entangled between a qubit qudit. We introduce conditional probability distribution $P(l^z|s^z)$ gluon's $l^z$ given its helicity $s^z$. Restricting three $l^z=0,\pm 1$, constitute...
We present improvements to the pointing accuracy of South Pole Telescope (SPT) using machine learning. The ability SPT point accurately at sky is limited by its structural imperfections, which are impacted extreme weather Pole. Pointing particularly important during participation in observing campaigns with Event Horizon (EHT), requires stricter than typical observations SPT. compile a training dataset historical astronomical sources made SPT-3G and EHT receivers on train two XGBoost models...
We present a measurement of gravitational lensing over 1500 deg$^2$ the Southern sky using SPT-3G temperature data at 95 and 150 GHz taken in 2018. The amplitude relative to fiducial Planck 2018 $\Lambda$CDM cosmology is found be $1.020\pm0.060$, excluding instrumental astrophysical systematic uncertainties. conduct extensive null tests check robustness measurements, report minimum-variance combined power spectrum angular multipoles $50<L<2000$, which we use constrain cosmological models....
Abstract This paper will introduce a new procedure for mapping the flow paths of steam, water and polymer floods frequently used in residual oil extraction. The entails strategic placement electrodes within designated reservoir. When field is flooded, charge liquid with low voltage, amperage, audio-frequency electrical current. current creates distinctive magnetic that represents location character occurring between electrodes. unique identified surveyed from surface using highly sensitive...