H. Thommesen
A5089514138- Cosmology and Gravitation Theories
- Radio Astronomy Observations and Technology
- Superconducting and THz Device Technology
- Geophysics and Gravity Measurements
- Solar and Space Plasma Dynamics
- Galaxies: Formation, Evolution, Phenomena
- Astrophysics and Cosmic Phenomena
- Dark Matter and Cosmic Phenomena
- Spacecraft Design and Technology
- Stellar, planetary, and galactic studies
- Advanced Differential Geometry Research
- Astronomy and Astrophysical Research
- Adaptive optics and wavefront sensing
- Computational Physics and Python Applications
- Scientific Research and Discoveries
- Statistical and numerical algorithms
- Climate variability and models
- Advanced Thermodynamics and Statistical Mechanics
- Calibration and Measurement Techniques
- Quantum Electrodynamics and Casimir Effect
- Astrophysics and Star Formation Studies
University of Oslo
2019-2024
The University of Texas at Austin
2024
National Institute of Standards and Technology
2024
Institut de Recherche en Astrophysique et Planétologie
2020
Japan Aerospace Exploration Agency
2020
The University of Tokyo
2020
We present constraints on the tensor-to-scalar ratio r using Planck data. use latest release of maps (PR4), processed with NPIPE code, which produces calibrated frequency in temperature and polarization for all channels from 30 GHz to 857 same pipeline. computed BB angular power spectrum, we also discuss coming TT spectrum. Given Planck's noise level, spectrum gives that are cosmic-variance limited (with $\sigma$(r)=0.093), but show marginalized posterior peaks towards negative values at...
We present the first model of full-sky polarized synchrotron emission that is derived from all WMAP and Planck LFI frequency maps. The basis this analysis set end-to-end reprocessed C OSMOGLOBE Data Release 1 (DR1) sky maps presented in a companion paper, which have significantly lower instrumental systematics than legacy products each experiment. find resulting amplitude map has an average noise rms per 2° full width at half maximum (FWHM) beam 3.2 μK 30 GHz. This 30% recently released B...
We present tensor-to-scalar ratio forecasts for GreenPol, a hypothetical ground-based B -mode experiment aiming to survey the cleanest regions of Northern Galactic Hemisphere at five frequencies between 10 and 44 GHz. Its primary science goal would be measure large-scale cosmic microwave background (CMB) polarization fluctuations multipoles ℓ ≲ 500, thereby constrain primordial r . The observations suggested take place Summit Station (72 ° 34N, 38 27W) on Greenland, an altitude 3216 m above...
SPIDER is a balloon-borne instrument designed to map the cosmic microwave background at degree-angular scales in presence of Galactic foregrounds. has mapped large sky area Southern Hemisphere using more than 2000 transition-edge sensors (TESs) during two NASA Long Duration Balloon flights above Antarctic continent. During its first flight January 2015, observed 95 GHz and 150 frequency bands, setting constraints on B-mode signature primordial gravitational waves. Its second 2022-23 season...
Spider is a balloon-borne instrument designed to map the cosmic microwave background at degree-angular scales in presence of Galactic foregrounds. has mapped large sky area Southern Hemisphere using more than 2000 transition-edge sensors (TESs) during two NASA Long Duration Balloon flights above Antarctic continent. During its first flight January 2015, was observed 95- and 150-GHz frequency bands, setting constraints on B-mode signature primordial gravitational waves. Its second 2022–2023...
We review and compare two different CMB dipole estimators discussed in the literature, assess their performances through Monte Carlo simulations. The first method amounts to simple template regression with partial sky data, while second is an optimal Wiener filter (or Gibbs sampling) implementation. main difference between methods that latter approach takes into account correlations higher-order temperature fluctuations arise from non-orthogonal spherical harmonics on incomplete sky, which...
We present tensor-to-scalar ratio forecasts for GreenPol, a hypothetical ground-based B-mode experiment aiming to survey the cleanest regions of Northern Galactic Hemisphere at five frequencies between 10 and 44 GHz. Its primary science goal would be measure large-scale CMB polarization fluctuations multipoles $\ell \lesssim 500$, thereby constrain primordial ratio. The observations suggested take place Summit Station (72deg N, 38deg W) on Greenland, an altitude 3216 m above sea level. In...
We present the first model of full-sky polarized synchrotron emission that is derived from all WMAP and Planck LFI frequency maps. The basis this analysis set end-to-end reprocessed Cosmoglobe Data Release 1 sky maps presented in a companion paper, which have significantly lower instrumental systematics than legacy products each experiment. find resulting amplitude map has an average noise rms $3.2\,\mathrm{μK}$ at 30 GHz $2^{\circ}$ FWHM, 30% recently released BeyondPlanck included only...
We present a Bayesian calibration algorithm for CMB observations as implemented within the global end-to-end BeyondPlanck (BP) framework, and apply this to Planck Low Frequency Instrument (LFI) data. Following most recent analysis, we decompose full time-dependent gain into sum of three orthogonal components: One absolute term, common all detectors; one time-independent term that can vary between component is allowed one-hour pointing periods. Each then sampled conditionally on other...