Joel Meyers
A5077169908- Cosmology and Gravitation Theories
- Radio Astronomy Observations and Technology
- Galaxies: Formation, Evolution, Phenomena
- Dark Matter and Cosmic Phenomena
- Astrophysics and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Superconducting and THz Device Technology
- Black Holes and Theoretical Physics
- Geophysics and Gravity Measurements
- Neutrino Physics Research
- Astronomy and Astrophysical Research
- Pulsars and Gravitational Waves Research
- Solar and Space Plasma Dynamics
- Computational Physics and Python Applications
- Gamma-ray bursts and supernovae
- Astronomical Observations and Instrumentation
- Advanced Thermodynamics and Statistical Mechanics
- Seismic Waves and Analysis
- Astrophysics and Star Formation Studies
- Delphi Technique in Research
- Advanced Mathematical Theories and Applications
- Adaptive optics and wavefront sensing
- Radio, Podcasts, and Digital Media
- Relativity and Gravitational Theory
- Astrophysical Phenomena and Observations
Southern Methodist University
2019-2024
University of Toronto
2014-2020
Canadian Institute for Theoretical Astrophysics
2014-2020
The University of Texas at Austin
2011
A bstract The baryon acoustic oscillation (BAO) analysis from the first year of data Dark Energy Spectroscopic Instrument (DESI), when combined with cosmic microwave background (CMB), has placed an upper-limit on sum neutrino masses, ∑ m ν < 70 meV (95%). In addition to excluding minimum associated inverted hierarchy, posterior is peaked at = 0 and close even minumum sum, 58 2 σ . this paper, we explore implications for cosmology particle physics. mass determined in suppression clustering...
Fluctuations in the cosmic neutrino background are known to produce a phase shift acoustic peaks of microwave background. It is through sensitivity this effect that recent CMB data has provided robust detection free-streaming neutrinos. In paper, we revisit anisotropy spectrum as probe new physics. The particularly interesting because its physical origin strongly constrained by analytic properties Green's function gravitational potential. For adiabatic fluctuations, requires modes propagate...
Abstract We present a detailed overview of the science goals and predictions for Prime-Cam direct-detection camera–spectrometer being constructed by CCAT-prime collaboration dedicated use on Fred Young Submillimeter Telescope (FYST). The FYST is wide-field, 6 m aperture submillimeter telescope built (first light in late 2023) an international consortium institutions led Cornell University sited at more than 5600 Cerro Chajnantor northern Chile. one two instruments planned will provide...
Abstract The effects of gravitational lensing the cosmic microwave background (CMB) have been measured at high significance with existing data and will be even more precisely in future surveys. Reversing on observed CMB temperature polarization maps provides a variety benefits. Delensed spectra sharper acoustic peaks prominent damping tails, allowing for improved inferences cosmological parameters that impact those features. Delensing reduces B -mode power, aiding search primordial waves...
A millimeter-wave survey over half the sky, that spans frequencies in range of 30 to 350 GHz, and is both an order magnitude deeper higher-resolution than currently funded surveys would yield enormous gain understanding fundamental physics astrophysics. By providing such a deep, high-resolution (about 0.5 uK-arcmin noise 15 arcsecond resolution at 150 GHz), CMB-HD will enable major advances. It allow 1) use gravitational lensing primordial microwave background map distribution matter on...
Inflation may provide unique insight into the physics at highest available energy scales that cannot be replicated in any realistic terrestrial experiment. Features primordial power spectrum are generically predicted a wide class of models inflation and its alternatives, observationally one most overlooked channels for finding evidence non-minimal inflationary models. Constraints from observations cosmic microwave background cover widest range feature frequencies, but sensitive constraints...
Our current understanding of the Universe is established through pristine measurements structure in cosmic microwave background (CMB) and distribution shapes galaxies tracing large scale (LSS) Universe. One key ingredient that underlies cosmological observables field sources observed assumed to be initially Gaussian with high precision. Nevertheless, a minimal deviation from Gaussianityis perhaps most robust theoretical prediction models explain Universe; itis necessarily present even...
We show how recent data from observations of the cosmic microwave background may suggest presence additional radiation density which appeared after big bang nucleosynthesis. propose a general scheme by this could be produced decay nonrelativistic matter, we place constraints on properties such and give specific examples scenarios in realized.
The hot dense environment of the early universe is known to have produced large numbers baryons, photons, and neutrinos. These extreme conditions may also other long-lived species, including new light particles (such as axions or sterile neutrinos) gravitational waves. effects any such relics can be observed through their unique imprint in cosmic microwave background (CMB), large-scale structure, primordial element abundances, are important determining initial universe. We argue that future...
We introduce and validate a delensing framework for the Simons Observatory (SO), which will be used to improve constraints on inflationary gravitational waves by reducing lensing noise in measurements of $B$ modes CMB polarization. SO initially observe using three small aperture telescopes one large-aperture telescope. While polarization maps from small-aperture constrain waves, internal delens reconstructed data Since obtained dominated subdegree scales, constructs template lensing-induced...
We present the first attempt to use a combination of CMB, LIGO, and Pulsar Timing Array (PPTA) data constrain both tilt running primordial tensor power spectrum through constraints on gravitational wave energy density generated in early universe. Combining measurements at different cosmological scales highlights how complementary can be used test predictions universe models including inflationary consistency relation. Current prefer slightly positive...
We study the degree to which cosmic microwave background (CMB) can be used constrain primordial non-Gaussianity involving one tensor and two scalar fluctuations, focusing on correlation of polarization $B$ mode with temperature modes. In simplest models inflation, tensor-scalar-scalar bispectrum is nonvanishing same order in slow-roll parameters as scalar-scalar-scalar bispectrum. calculate $⟨BTT⟩$ arising from a bispectrum, show that constraints an experiment like CMB-Stage IV using this...
Gravitational potentials which change in time induce fluctuations the observed cosmic microwave background (CMB) temperature. Cosmological structure moving transverse to our line of sight provides a specific example known as lens effect. Here we explore how CMB temperature combined with matter over-density can be used infer velocity cosmological on large scales. We show that near-future surveys and galaxy will have statistical power make first detection effect, discuss applications for...
We investigate the detection prospects for gravitational lensing of three-dimensional maps from upcoming line intensity surveys, focusing in particular on impact nonlinearities standard quadratic estimators. Using perturbation theory, we show that these can provide a significant contaminant to reconstruction, even observations at reionization-era redshifts. However, how this contamination be mitigated with use "bias-hardened" estimator. Along way, present an estimator reconstructing...
We explore the superhorizon generation of large ${f}_{\mathrm{NL}}$ local form in two-field inflation. calculate two- and three-point observables a general class potentials which allow for an analytic treatment using $\ensuremath{\delta}N$ formalism. Motivated by conservation curvature perturbation outside horizon adiabatic mode also observed adiabaticity power spectrum, we follow evolution ${f}_{\mathrm{NL}}^{\mathrm{local}}$ until it is driven into solution passing through phase...
We study the impact of perturbative reheating on primordial observables in models multiple-field inflation. By performing a sudden decay calculation, we derive analytic expressions for local-type non-linearity parameter $f_{\rm NL}^{\rm local}$, scalar spectral index $n_\zeta$, and tensor-to-scalar ratio $r_T$ as functions rates inflationary fields. compare our results to fully numerical classical field theory simulation, finding excellent agreement. find that sensitivity NL}$, phase depends...
We present the detailed science case, and brief descriptions of telescope design, site, first light instrument plans for a new ultra-wide field submillimeter observatory, CCAT-prime, that we are constructing at 5600 m elevation site on Cerro Chajnantor in northern Chile. Our goals to study star galaxy formation from epoch reionization present, investigate growth structure Universe, improve precision B-mode CMB measurements, interstellar medium Galaxy nearby galaxies through spectroscopic,...
Gravitational lensing by large-scale structure significantly impacts observations of the cosmic microwave background (CMB): it smooths acoustic peaks in temperature and $E$-mode polarization power spectra, correlating previously uncorrelated modes; converts into $B$-mode polarization. The act measuring removing effect from CMB maps, or delensing, has been well studied context $B$ modes, but little attention given to delensing $E$ modes. In this paper, we model expected delensed $T$ spectra...
The cosmic microwave background (CMB) places a variety of model-independent constraints on the strength interactions dominant component dark matter with standard model. Percent-level subcomponents can evade most stringent CMB bounds by mimicking behavior baryons, allowing for larger couplings and novel experimental signatures. However, in this Letter, we will show that such tightly coupled leave measurable imprint is well approximated change to helium fraction, Y_{He}. Using existing...
We describe the design of a gravitational wave timing array, novel scheme that can be used to search for low-frequency waves by monitoring continuous at higher frequencies. show observations produced Galactic binaries using space-based detector like LISA provide sensitivity in nanohertz microhertz band. While expected this proposal is not competitive with other methods, it fills gap frequency space around regime, which above range probed current pulsar arrays and below direct coverage LISA....
We assess the prospects for detecting moving lens effect using cosmological surveys. The bulk motion of structure induces a small-scale dipolar temperature anisotropy cosmic microwave radiation, centered around halos and oriented along transverse velocity field. introduce set optimal filters this signal forecast that high significance detection can be made with upcoming experiments. discuss reconstructing field on large scales matched filters, finding good agreement previous work quadratic...