A5079201067- Cosmology and Gravitation Theories
- Superconducting and THz Device Technology
- Radio Astronomy Observations and Technology
- Geophysics and Gravity Measurements
- Dark Matter and Cosmic Phenomena
- Astronomy and Astrophysical Research
- Superconducting Materials and Applications
- Galaxies: Formation, Evolution, Phenomena
- Astrophysics and Cosmic Phenomena
- Spacecraft and Cryogenic Technologies
- Physics of Superconductivity and Magnetism
- Astrophysics and Star Formation Studies
- Particle Accelerators and Free-Electron Lasers
- Pulsars and Gravitational Waves Research
- Particle Detector Development and Performance
- Superconductivity in MgB2 and Alloys
- Refrigeration and Air Conditioning Technologies
- Functional Brain Connectivity Studies
- Satellite Communication Systems
- Scientific Research and Discoveries
- CCD and CMOS Imaging Sensors
- Advanced Frequency and Time Standards
- Advanced Thermodynamic Systems and Engines
- Advanced Wireless Communication Techniques
- Advanced Sensor Technologies Research
Stanford University
2015-2024
California Institute of Technology
2018-2023
SLAC National Accelerator Laboratory
2014-2020
Twin Cities Orthopedics
2018
Center for Astrophysics Harvard & Smithsonian
2014-2018
Cardiff University
2018
University of Minnesota
2018
Massachusetts Institute of Technology
2018
Kavli Institute for Particle Astrophysics and Cosmology
2014-2017
Ulsan National Institute of Science and Technology
2017
We present results from an analysis of all data taken by the BICEP2, Keck Array, and BICEP3 CMB polarization experiments up to including 2018 observing season. add additional Array observations at 220 GHz 95 previous 95/150/220 dataset. The Q/U maps now reach depths 2.8, 8.8 μK_{CMB} arcmin 95, 150, GHz, respectively, over effective area ≈600 square degrees ≈400 150 GHz. achieve a signal-to-noise ratio on polarized dust emission exceeding that Planck 353 take auto- cross-spectra between...
We present results from an analysis of all data taken by the bicep2/Keck CMB polarization experiments up to and including 2015 observing season. This includes first Keck Array observations at 220 GHz additional 95 150 GHz. The Q U maps reach depths 5.2, 2.9, 26 μKCMB arcmin 95, 150, GHz, respectively, over effective area ≈400 square degrees. achieve a signal noise on polarized dust emission approximately equal that Planck 353 take auto cross spectra between these publicly available WMAP...
We report on the design and performance of BICEP3 instrument its first three-year data set collected from 2016 to 2018. is a 52cm aperture, refracting telescope designed observe polarization cosmic microwave background (CMB) degree angular scales at 95GHz. It started science observation South Pole in with 2400 antenna-coupled transition-edge sensor (TES) bolometers. The receiver demonstrated new technologies such as large-diameter alumina optics, Zotefoam infrared filters, flux-activated...
Bicep3 is a 550 mm-aperture refracting telescope for polarimetry of radiation in the cosmic microwave background at 95 GHz.It adopts methodology Bicep1, Bicep2 and Keck Array experiments -it possesses sufficient resolution to search signatures inflation-induced gravitational-wave while utilizing compact design ease construction facilitate characterization mitigation systematics.However, represents significant breakthrough per-receiver sensitivity, with focal plane area 5× larger than...
Bicep Array is the newest multi-frequency instrument in Bicep/Keck program. It comprised of four 550mm aperture refractive telescopes observing polarization cosmic microwave background (CMB) at 30/40, 95, 150 and 220/270 GHz with over 30,000 detectors. We present an overview receiver, detailing optics, thermal, mechanical, magnetic shielding design. follows Bicep3's modular focal plane concept, upgrades to 6" wafer reduce fabrication higher detector count per module. The first receiver...
We present estimates of line-of-sight distortion fields derived from the 95 GHz and 150 data taken by BICEP2, BICEP3, Keck Array up to 2018 observing season, leading cosmological constraints a study instrumental astrophysical systematics. Cosmological are three concerning gravitational lensing large-scale structure, polarization rotation magnetic or an axion-like field, screening effect patchy reionization. measure amplitude power spectrum $A_L^{\phi\phi}=0.95 \pm 0.20$. constrain rotation,...
ABSTRACT We present measurements of polarization lensing using the 150 GHz maps, which include all data taken by BICEP2 and Keck Array Cosmic Microwave Background experiments up to including 2014 observing season (BK14). Despite their modest angular resolution ( ), excellent sensitivity (∼3 μ K-arcmin) these maps makes it possible directly reconstruct potential only information at larger scales ). From auto-spectrum reconstructed potential, we measure an amplitude spectrum be Planck ΛCDM...
We present the strongest constraints to date on anisotropies of cosmic microwave background (CMB) polarization rotation derived from 150 GHz data taken by BICEP2 Keck Array CMB experiments up and including 2014 observing season (BK14). The definition angle in BK14 maps has gone through self-calibration which overall is adjusted minimize observed $TB$ $EB$ power spectra. After this procedure, $QU$ lose sensitivity a uniform but are still sensitive rotation. This analysis places rotation,...
BICEP3 is a $550~mm$ aperture telescope with cold, on-axis, refractive optics designed to observe at the $95~GHz$ band from South Pole. It newest member of BICEP/Keck family inflationary probes specifically measure polarization cosmic microwave background (CMB) degree-angular scales. house 1280 dual-polarization pixels, which, when fully-populated, totals $\sim$9$\times$ number pixels in single Keck receiver, thus further advancing program's mapping speed. was deployed during austral summer...
We present a constraint on the tensor-to-scalar ratio, $r$, derived from measurements of cosmic microwave background (CMB) polarization $B$-modes with "delensing," whereby uncertainty $r$ contributed by sample variance gravitational lensing is reduced cross-correlating against $B$-mode template. This template constructed combining an estimate polarized CMB tracer projected large-scale structure. The large-scale-structure used map infrared Planck satellite data, while comes combination South...
Abstract We characterize Galactic dust filaments by correlating BICEP/Keck and Planck data with polarization templates based on neutral hydrogen (H i ) observations. Dust is important for both our understanding of astrophysical processes in the interstellar medium (ISM) search primordial gravitational waves cosmic microwave background (CMB). In diffuse ISM, H strongly correlated partly organized into that are aligned local magnetic field. analyze deep at 95, 150, 220 GHz, over...
Bicep3 is a 520mm aperture, compact two-lens refractor designed to observe the polarization of cosmic microwave background (CMB) at 95 GHz. Its focal plane consists modularized tiles antenna-coupled transition edge sensors (TESs), similar those used in Bicep2 and Keck Array. The increased per-receiver optical throughput compared Bicep2/Keck Array, due both its faster f=1:7 optics larger more than doubles combined mapping speed Bicep/Keck program. receiver was recently upgraded full...
BICEP2 and the Keck Array are polarization-sensitive microwave telescopes that observe cosmic background (CMB) from South Pole at degree angular scales in search of a signature inflation imprinted as B-mode polarization CMB. was deployed late 2009, observed for three years until end 2012 150 GHz with 512 antenna-coupled transition edge sensor bolometers, has reported detection on scales. The first 2010 will through 2016 five receivers several frequencies (95, 150, 220 GHz). share common...
A detection of curl-type (B-mode) polarization the primary CMB would be direct evidence for inflationary paradigm origin Universe. The Bicep/Keck Array (BK) program targets degree angular scales, where power from primordial B-mode is expected to peak, with ever-increasing sensitivity and has published most stringent constraints on inflation date. Bicep (BA) Stage-3 instrument BK will comprise four Bicep3-class receivers observing at 30/40, 95, 150 220/270 GHz a combined 32,000+ detectors;...
We present an improved search for axionlike polarization oscillations in the cosmic microwave background (CMB) with observations from Keck Array. An all-sky, temporally sinusoidal rotation of CMB polarization, equivalent to a time-variable birefringence, is observable manifestation local axion field and potentially allows polarimeter detect dark matter directly. describe improvements method presented previous work, we demonstrate updated expanded dataset consisting 2012--2015 observing...
We derive an estimator for the lensing potential from galaxy number counts which contains a linear and quadratic term. show that this has much larger signal-to-noise ratio than corresponding intensity mapping. This is due to additional term in count angular power spectrum present already at order. estimate future photometric surveys. Particularly high redshifts, $z\gtrsim 1.5$, signal noise can become of order 30. Therefore, surveys would be excellent means measure tomographic spectra.
BICEP3 is a 520mm aperture on-axis refracting telescope observing the polarization of cosmic microwave background (CMB) at 95GHz in search B-mode signal originating from ationary gravitational waves. BICEP3's focal plane populated with modularized tiles antenna-coupled transition edge sensor (TES) bolometers. was deployed to South Pole during 2014-15 austral summer and has been operational since. During 2016-17 summer, we implemented changes optical elements that lead better noise...
BICEP3, the latest telescope in BICEP/Keck program, started science observations March 2016. It is a 550mm aperture refractive observing polarization of cosmic microwave background at 95 GHz. We show focal plane design and detector performance, including spectral response, optical efficiency preliminary sensitivity upgraded BICEP3. demonstrate 9.72 μKCMB√s noise performance BICEP3 receiver.
SPHEREx, the Spectro-Photometer for History of Universe, Epoch Reionization, and ices Explorer, is a NASA MIDEX mission planned launch in 2024. SPHEREx will carry out first all-sky spectral survey at wavelengths between 0.75µm 5µm with resolving power ~40 0.75 3.8µm ~120 3.8 At end its two-year mission, provide 0.75-to-5µm spectra each 6."2x6."2 pixel on sky - 14 billion all. This paper updates an earlier description presenting changes made during mission's Preliminary Design Phase,...
This is a solicited whitepaper for the Snowmass 2021 community planning exercise. The paper focuses on measurements and science with Cosmic Microwave Background (CMB). CMB foundational to our understanding of modern physics continues be powerful tool driving cosmology particle physics. In this paper, we outline broad unique impact High Energy Frontier in upcoming decade. We also describe progression ground-based experiments, which shows that prepared develop key capabilities facilities...
A linear polarization field on the sphere can be uniquely decomposed into an E-mode and a B-mode component. These two components are analytically defined in terms of spin-2 spherical harmonics. Maps that contain filtered modes partial sky also components. However, lack full information prevents orthogonally separating these using In this paper, we present technique for decomposing incomplete map E B eigenmodes pixel covariance observed map. This method is found to define presence both...
Precision measurements of cosmic microwave background (CMB) polarization require extreme control instrumental systematics. In a companion paper we have presented cosmological constraints from observations with the BICEP2 and Keck Array experiments up to including 2015 observing season (BK15), resulting in deepest CMB maps date statistical sensitivity tensor-to-scalar ratio $\sigma(r) = 0.020$. this work characterize beams constrain potential systematic contamination main beam shape mismatch...
BICEP3 is a small-aperture refracting cosmic microwave background (CMB) telescope designed to make sensitive polarization maps in pursuit of potential B-mode signal from inflationary gravitational waves. It the latest BICEP/Keck Array series CMB experiments at South Pole, which has provided most stringent constraints on inflation date. For 2016 observing season, was outfitted with full suite 2400 optically coupled detectors operating 95 GHz. In these proceedings we report far field beam...
We present a search for axionlike polarization oscillations in the cosmic microwave background (CMB) with observations from Keck Array. A local axion field induces an all-sky, temporally sinusoidal rotation of CMB polarization. polarimeter can thus function as direct-detection experiment dark matter. develop techniques to extract oscillation signal. Many elements method are generic polarimetry experiments and be adapted other datasets. As first demonstration, we process data 2012 observing...