Jon E. Gudmundsson
A5001041812- Radio Astronomy Observations and Technology
- Superconducting and THz Device Technology
- Cosmology and Gravitation Theories
- Astrophysics and Cosmic Phenomena
- Adaptive optics and wavefront sensing
- Astronomy and Astrophysical Research
- Dark Matter and Cosmic Phenomena
- Galaxies: Formation, Evolution, Phenomena
- Spacecraft and Cryogenic Technologies
- Geophysics and Gravity Measurements
- Pulsars and Gravitational Waves Research
- Scientific Research and Discoveries
- Advanced Thermodynamic Systems and Engines
- Terahertz technology and applications
- Solar and Space Plasma Dynamics
- Neutrino Physics Research
- Aerospace Engineering and Energy Systems
- Computational Physics and Python Applications
- Microwave and Dielectric Measurement Techniques
- Satellite Communication Systems
- Precipitation Measurement and Analysis
- Antenna Design and Optimization
- Photonic and Optical Devices
- Adrenal and Paraganglionic Tumors
- Spacecraft Design and Technology
Stockholm University
2016-2024
AlbaNova
2016-2024
University of Iceland
2023-2024
University of California, Berkeley
2023
National University Hospital of Iceland
2023
Jet Propulsion Laboratory
2020
University of Illinois System
2020
Kyoto University
2020
The University of Tokyo
2020
Consejo Superior de Investigaciones Científicas
2019
The Simons Observatory (SO) is a new cosmic microwave background experiment being built on Cerro Toco in Chile, due to begin observations the early 2020s. We describe scientific goals of experiment, motivate design, and forecast its performance. SO will measure temperature polarization anisotropy six frequency bands: 27, 39, 93, 145, 225 280 GHz. initial configuration have three small-aperture 0.5-m telescopes (SATs) one large-aperture 6-m telescope (LAT), with total 60,000 cryogenic...
We report the results of a joint analysis data from BICEP2/Keck Array and Planck. BICEP2 Keck have observed same approximately 400 deg$^2$ patch sky centered on RA 0h, Dec. $-57.5\deg$. The combined maps reach depth 57 nK deg in Stokes $Q$ $U$ band at 150 GHz. Planck has full polarization seven frequencies 30 to 353 GHz, but much less deeply any given region (1.2 $\mu$K 143 GHz). detect 150$\times$353 cross-correlation $B$-modes high significance. fit single- cross-frequency power spectra...
We present the science case, reference design, and project plan for Stage-4 ground-based cosmic microwave background experiment CMB-S4.
Abstract CMB-S4—the next-generation ground-based cosmic microwave background (CMB) experiment—is set to significantly advance the sensitivity of CMB measurements and enhance our understanding origin evolution universe. Among science cases pursued with CMB-S4, quest for detecting primordial gravitational waves is a central driver experimental design. This work details development forecasting framework that includes power-spectrum-based semianalytic projection tool, targeted explicitly toward...
The Simons Observatory (SO) is a ground-based cosmic microwave background (CMB) experiment sited on Cerro Toco in the Atacama Desert Chile that promises to provide breakthrough discoveries fundamental physics, cosmology, and astrophysics. Supported by Foundation, Heising-Simons with contributions from collaborating institutions, SO will see first light 2021 start five year survey 2022. has 287 collaborators 12 countries 53 including 85 students 90 postdocs. its currently funded form...
Abstract We present the first linear polarization measurements from 2015 long-duration balloon flight of Spider , which is an experiment that designed to map cosmic microwave background (CMB) on degree angular scales. The results these include maps and power spectra observations 4.8% sky at 95 150 GHz, along with internal consistency tests data. While polarized CMB anisotropy primordial density perturbations dominant signal in this region sky, Galactic dust emission also detected high...
We summarize the recent progress of Axion Longitudinal Plasma Haloscope (ALPHA) Consortium, a new experimental collaboration to build plasma haloscope search for axions and dark photons. The is novel method detection resonant conversion light matter ALPHA will be sensitive QCD over almost decade parameter space, potentially discovering resolving strong $CP$ problem. Unlike traditional cavity haloscopes, which are generally limited in volume by Compton wavelength matter, haloscopes use wire...
Abstract We study the possibility of using LiteBIRD satellite B -mode survey to constrain models inflation producing specific features in CMB angular power spectra. explore a particular model example, i.e. spectator axion-SU(2) gauge field inflation. This can source parity-violating gravitational waves from amplification fluctuations driven by pseudoscalar “axionlike” field, rolling for few e-folds during The sourced exceed vacuum contribution at reionization bump scales about an order...
We evaluate the ability of SPIDER, a balloon-borne polarimeter, to detect divergence-free polarization pattern ("B-modes") in Cosmic Microwave Background (CMB). In inflationary scenario, amplitude this signal is proportional that primordial scalar perturbations through tensor-to-scalar ratio r. show expected level systematic error SPIDER instrument significantly below an interesting cosmological with r=0.03. present scanning strategy enables us minimize uncertainty reconstruction Stokes...
We propose to achieve the proof-of-principle of PTOLEMY project directly detect Cosmic Neutrino Background (CNB). Each technological challenges described in [1,2] will be targeted and hopefully solved by use latest experimental developments profiting from low background environment provided LNGS underground site. The first phase focus on graphene technology for a tritium target demonstration TES microcalorimetry with an energy resolution better than 0.05 eV electrons. These technologies...
The Simons Observatory (SO) will make precise temperature and polarization measurements of the cosmic microwave background (CMB) using a set telescopes which cover angular scales between 1 arcminute tens degrees, contain over 60,000 detectors, observe at frequencies 27 270 GHz. SO consist 6 m aperture telescope coupled to 30,000 transition-edge sensor bolometers along with three 42 cm refractive telescopes, an additional 30,000+ all be located in Atacama Desert altitude 5190 m. powerful...
The PTOLEMY project aims to develop a scalable design for Cosmic Neutrino Background (CNB) detector, the first of its kind and only one conceived that can look directly at image Universe encoded in neutrino background produced second after Big Bang. scope work next three years is complete conceptual this detector validate with direct measurements non-neutrino backgrounds are below expected cosmological signal. In paper we discuss details theoretical aspects experiment physics goals....
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...
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...
CMB-S4, the next-generation ground-based cosmic microwave background (CMB) observatory, will provide detailed maps of CMB at millimeter wavelengths to dramatically advance our understanding origin and evolution universe. CMB-S4 deploy large- small-aperture telescopes with hundreds thousands detectors observe arcminute degree resolutions wavelengths. Inflationary science benefits from a deep delensing survey capable observing large field view This kind acts as complement angular resolution...
Abstract We present a study of the impact beam far side-lobe lack knowledge on measurement Cosmic Microwave Background B -mode signal at large scale. Beam side-lobes induce mismatch in transfer function Galactic foregrounds between dipole and higher multipoles which degrads performances component separation methods. This leads to foreground residuals CMB map. It is expected be one main source systematic effects future polarization observations. Thus, it becomes crucial for all-sky survey...
We describe SPIDER, a balloon-borne instrument to map the polarization of millimeter-wave sky with degree angular resolution. Spider consists six monochromatic refracting telescopes, each illuminating focal plane large-format antenna-coupled bolometer arrays. A total 2,624 superconducting transition-edge sensors are distributed among three observing bands centered at 90, 150, and 280 GHz. cold half-wave plate aperture telescope modulates incoming light control systematics. SPIDER's first...
CMB-S4 is a proposed experiment to map the polarization of Cosmic Microwave Background (CMB) nearly cosmic variance limit for angular scales that are accessible from ground. The science goals and capabilities in illuminating inflation, measuring sum neutrino masses, searching relativistic relics early universe, characterizing dark energy matter, mapping matter distribution universe have been described Science Book. This Technology Book companion volume ambitious CMB-S4, "Stage-4" experiment,...
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...
A common optical design for a coma-corrected, 6-meter aperture, crossed-Dragone telescope has been adopted the CCAT-prime of CCAT Observatory, Inc., and Large Aperture Telescope Simons Observatory. Both are to be built in high altitude Atacama Desert Chile submillimeter millimeter wavelength observations, respectively. The delivers throughput, relatively flat focal plane, with field view 7.8 degrees diameter 3 mm wavelengths, ability illuminate >100k diffraction-limited beams < 1...
Abstract The Simons Observatory (SO) is a cosmic microwave background survey experiment that includes small-aperture telescopes (SATs) observing from an altitude of 5200 m in the Atacama Desert Chile. SO SATs will cover six spectral bands between 27 and 280 GHz to search for primordial B-modes sensitivity σ ( r ) = 0.002, with quantified systematic errors well below this value. Each SAT self-contained cryogenic telescope 35° field view, 42 cm diameter optical aperture, 40 K half-wave plate,...