A5055320693- Cosmology and Gravitation Theories
- Radio Astronomy Observations and Technology
- Galaxies: Formation, Evolution, Phenomena
- Astrophysics and Cosmic Phenomena
- Dark Matter and Cosmic Phenomena
- Geophysics and Gravity Measurements
- Astronomy and Astrophysical Research
- Superconducting and THz Device Technology
- Particle physics theoretical and experimental studies
- Astrophysics and Star Formation Studies
- Black Holes and Theoretical Physics
- Adaptive optics and wavefront sensing
- Solar and Space Plasma Dynamics
- Pulsars and Gravitational Waves Research
- Computational Physics and Python Applications
- Atomic and Subatomic Physics Research
- Neutrino Physics Research
- Statistical and numerical algorithms
- Antenna Design and Optimization
- Gamma-ray bursts and supernovae
- High-Energy Particle Collisions Research
- Nuclear Physics and Applications
- Advanced Measurement and Metrology Techniques
- Geomagnetism and Paleomagnetism Studies
- Astronomical Observations and Instrumentation
Perimeter Institute
2023-2024
Johns Hopkins University
2021-2024
Imperial College London
2018-2022
University of Baltimore
2022
ORCID
2019
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...
We determine the upper limit on mass of lightest neutrino from most robust recent cosmological and terrestrial data. Marginalizing over possible effective relativistic degrees freedom at early times (${N}_{\mathrm{eff}}$) assuming normal ordering, is less than 0.037 eV 95% confidence; with inverted bound 0.042 eV. These results improve upon strength robustness other limits constrain to be barely larger largest splitting. show impacts realistic models different sources ${N}_{\mathrm{eff}}$.
Abstract This paper discusses the science case for a sensitive spectro-polarimetric survey of microwave sky. Such would provide tomographic and dynamic census three-dimensional distribution hot gas, velocity flows, early metals, dust, mass in entire Hubble volume, exploit CMB temperature polarisation anisotropies down to fundamental limits, track energy injection absorption into radiation background across cosmic times by measuring spectral distortions blackbody emission. In addition its...
CMB-HD is a proposed millimeter-wave survey over half the sky that would be ultra-deep (0.5 uK-arcmin) and have unprecedented resolution (15 arcseconds at 150 GHz). Such answer many outstanding questions about fundamental physics of Universe. Major advances 1.) use gravitational lensing primordial microwave background to map distribution matter on small scales (k~10 h Mpc^(-1)), which probes dark particle properties. It will also allow 2.) measurements thermal kinetic Sunyaev-Zel'dovich...
The kinetic Sunyaev Zel'dovich (kSZ) and moving lens effects, secondary contributions to the cosmic microwave background (CMB), carry significant cosmological information due their dependence on large-scale peculiar velocity field. Previous work identified a promising means of extracting this using set quadratic estimators for radial transverse components These are based statistically anisotropic cross-correlation between CMB tracer large scale structure, such as galaxy redshift survey. In...
It is natural to wonder whether there may be observational relics of new fundamental fields, beyond the inflaton, in large scale structure. Here we discuss phenomenology a model which compensated isocurvature perturbations (CIPs) arise through action primordial vector field that displaces dark matter relative baryons. The can tested best by kinematic-Sunyaev-Zeldovich tomography, involves cross-correlation cosmic microwave background and galaxy surveys, with next-generation observatories....
We forecast neutrino mass constraints using Stage IV CMB and large-scale structure surveys, focusing on kSZ tomography as an independent probe of the growth cosmic structure. take into account several realistic factors, including optical depth degeneracy. Our baseline setup consists S4 temperature polarization (but not lensing) information, DESI BAO, LSST galaxy power spectrum, a Planck like $\tau$ prior, yielding $\sigma(\sum m_\nu) = 32\, \rm{meV}$. Adding improves this by few percent,...
We investigate lensing reconstruction using the clustered galaxy distribution as a source field, both traditional cosmic microwave background quadratic estimator and shear-only estimator. calculate expected signal-to-noise ratio of cross power spectrum such reconstructions with shear measurements for an LSST-like survey. Modeling field Gaussian random we find that there is substantial clustering signal in at angular scales substantially smaller than those typically used by CMB...
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...
Velocity fields can be reconstructed at cosmological scales from their influence on the correlation between cosmic microwave background and large-scale structure. Effects that induce such correlations include kinetic Sunyaev Zel'dovich (kSZ) effect moving-lens effect, both of which will measured to high precision with upcoming cosmology experiments. Galaxy measurements also provide a window into measuring velocities redshift-space distortions (RSDs). The information accessed kSZ or RSDs,...
If the physics behind dark energy and/or matter violates parity symmetry assumed in standard cosmological paradigm, linear polarization of cosmic microwave background (CMB) photons can rotate due to their coupling sector. Recent 3$\sigma$ hints this ``cosmic birefringence" EB spectrum CMB motivates us pursue new directions independently validate and characterize signal. Here, we explore prospects probe birefringence from small-scale fluctuations using polarized Sunyaev-Zel'dovich (pSZ)...
Ultralight axions (ULAs) are a promising and intriguing set of dark-matter candidates. We study the prospects to use forthcoming measurements 21-cm fluctuations from cosmic dawn probe ULAs. focus in particular on velocity acoustic oscillations (VAOs) large-scale power spectrum, features imprinted by long-wavelength ($k\ensuremath{\sim}0.1\text{ }\text{ }{\mathrm{Mpc}}^{\ensuremath{-}1}$) modulation, dark-matter--baryon relative velocities, small-scale...
The cosmic microwave background (CMB) serves as a backlight to large-scale structure during the epoch of reionization, where Thomson scattering gives rise temperature anisotropies on small angular scales from kinetic Sunyaev Zel'dovich (kSZ) effect. In this paper, we demonstrate that technique kSZ tomography (velocity reconstruction), based cross-correlations between CMB and 21-cm surveys, can significantly improve constraints models inhomogeneous reionization provide information about modes...
Compensated isocurvature perturbations (CIPs) are modulations of the relative baryon and dark matter density that leave total constant. The best current constraints from primary cosmic microwave background (CMB) consistent with CIPs some 2 orders magnitude larger in amplitude than adiabatic perturbations, suggesting there may be a huge gap our knowledge early Universe. However, it was recently suggested by Barreira et al. correlated primordial curvature perturbation, as arises versions...
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...
The kinetic Sunyaev-Zel'dovich effect is a secondary CMB temperature anisotropy that provides powerful probe of the radial-velocity field matter distributed across Universe. This velocity reconstructed by combining high-resolution measurements with galaxy survey data, and it an unbiased tracer perturbations in linear regime. In this paper, we show how measurement can be used to primordial non-Gaussianity local type, particularly focusing on trispectrum amplitude...
Compensated isocurvature perturbations (CIPs) are relative density in which a baryon-density fluctuation is accompanied by dark matter such that the total-matter unperturbed. These fluctuations can be produced primordially if multiple fields present during inflation, and therefore they used to differentiate between different models for early Universe. Kinetic Sunyaev-Zeldovich tomography allows reconstruction of radial-velocity field as function redshift. This technique reconstruct...
The kinetic Sunyaev-Zeldovich (kSZ) effect will be an important source of cosmological and astrophysical information in upcoming surveys the cosmic microwave background (CMB). However, kSZ also act as dominant noise for several other measurements that use small angular scales CMB temperature maps, since its blackbody nature implies standard component separation techniques cannot used to remove it from observed maps. In this paper, we explore idea "de-kSZing": constructing a template...
The next generation of ground-based cosmic microwave background (CMB) experiments aim to measure temperature and polarization fluctuations up ${\ensuremath{\ell}}_{\mathrm{max}}\ensuremath{\approx}5000$ over half the sky. Combined with Planck data on large scales, this will provide improved constraints primordial non-Gaussianity. However, impressive resolution these come at a price. Besides signal confusion from galactic foregrounds, extragalactic late-time gravitational effects, lensing...
Abstract This Science White Paper, prepared in response to the ESA Voyage 2050 call for long-term mission planning, aims describe various science possibilities that can be realized with an L-class space observatory is dedicated study of interactions cosmic microwave background (CMB) photons web. Our aim specifically use CMB as a backlight – and survey gas, total mass, stellar content entire observable Universe by means analyzing spatial spectral distortions imprinted on it. These result from...
Reionization of helium is expected to occur at redshifts $z\sim3$ and have important consequences for quasar populations, galaxy formation, the morphology intergalactic medium, but there little known empirically about process. Here we show that kinetic Sunyaev-Zeldovich (kSZ) tomography, based on combination CMB measurements surveys, can be used infer primordial abundance as well time duration reionization. We find a high-significance detection ${\sim10\sigma}$ from Vera Rubin Observatory...
The existence of a cosmic neutrino background has been inferred indirectly from cosmological surveys through its effect on the linear-theory evolution primordial density perturbations, as well measurements abundances light elements. Constraints masses three species imply that at least two them move nonrelativistically today. As consequence, nonlinear perturbations results in formation halos around dark matter halos. We study whether these can be detected foreseeable future weak gravitational...
We explore the prospects of upcoming 21-cm surveys cosmic dawn ($12\ensuremath{\lesssim}z\ensuremath{\lesssim}30$) to provide cosmological information on top microwave background (CMB) and large-scale structure surveys, such as CMB-S4, Simons Observatory (SO) DESI. focus effective number relativistic species ${N}_{\mathrm{eff}}$ which is a promising observable for probing beyond Standard Model theories. show including Square Kilometre Array (SKA) can allow wide range models light particles...
This paper discusses the science case for a sensitive spectro-polarimetric survey of microwave sky. Such would provide tomographic and dynamic census three-dimensional distribution hot gas, velocity flows, early metals, dust, mass in entire Hubble volume, exploit CMB temperature polarisation anisotropies down to fundamental limits, track energy injection absorption into radiation background across cosmic times by measuring spectral distortions blackbody emission. In addition its exceptional...