In October 2014, POLARBEAR published a measurement of B-mode polarization at 150 GHz.[5] These measurements focused on arcminute scale fluctuations likely sourced by gravitational lensing by intervening large-scale structure. Earlier in the year, the BICEP2 project published related measurements of degree-scale B-mode polarization, possibly sourced by primordial gravitational waves from cosmic inflation, but they could not rule out cosmic dust as a cause.
POLARBEAR's published measurements focused on a small but clean patch of the sky where galactic foregrounds should be subdominant to gravitational lensing B-modes. The POLARBEAR team was able to report that the measured B-mode polarization was of cosmic origin at a 97.2% confidence level by focusing their observing time on this small patch where they are highly sensitive to arcminute anisotropies. However, this observing strategy is insensitive to the larger degree-scale inflationary B-modes that BICEP2 and Keck Array have searched for. [6]
^Ade, Peter A. R.; et al. (2015). "POLARBEAR constraints on cosmic birefringence and primordial magnetic fields". Physical Review D. 92 (12): 123509. arXiv:1509.02461. doi:10.1103/PhysRevD.92.123509. S2CID 118546886.
^Keating, B.; Moyerman, S.; Boettger, D.; Edwards, J.; Fuller, G.; Matsuda, F.; Miller, N.; Paar, H.; Rebeiz, G.; et al. (2011). "Ultra High Energy Cosmology with POLARBEAR". 1110: 2101. arXiv:1110.2101. Bibcode:2011arXiv1110.2101K. {{cite journal}}: Cite journal requires |journal= (help)
^Lee, Adrian T.; Tran, Huan; Ade, Peter; Arnold, Kam; Borrill, Julian; Dobbs, Matt A.; Errard, Josquin; Halverson, Nils; Holzapfel, William L.; Howard, Jacob; Jaffe, Andrew; Keating, Brian; Kermish, Zigmund; Linder, Eric; Miller, Nathan; Myers, Mike; Niarchou, Anastasia; Paar, Hans; Reichardt, Christian; Spieler, Helmuth; Steinbach, Bryan; Stompor, Radek; Tucker, Carole; Quealy, Erin; Richards, Paul L.; Zahn, Oliver; Kodama, Hideo; Ioka, Kunihito (28 August 2008). "POLARBEAR: Ultra-high Energy Physics with Measurements of CMB Polarization". AIP Conference Proceedings. 1040: 66. doi:10.1063/1.2981555.
^"First Light in Chile!". University of California Berkeley Department of Physics. Retrieved March 5, 2012.
^The Polarbear Collaboration (October 2014). "A Measurement of the Cosmic Microwave Background B-Mode Polarization Power Spectrum at Sub-Degree Scales with POLARBEAR". The Astrophysical Journal. 794 (2): 171. arXiv:1403.2369. Bibcode:2014ApJ...794..171P. doi:10.1088/0004-637X/794/2/171. S2CID 118598825.
^"POLARBEAR project offers clues about origin of universe's cosmic growth spurt". Christian Science Monitor. October 21, 2014.
External linksedit
POLARBEAR website
UCSD Cosmology website
March 16, 2024
polarbear, polarization, background, radiation, cosmic, microwave, background, polarization, experiment, located, atacama, desert, northern, chile, antofagasta, region, experiment, mounted, huan, tran, telescope, james, observatory, chajnantor, science, reserv. POLARBEAR POLARization of the Background Radiation 1 is a cosmic microwave background polarization experiment located in the Atacama Desert of northern Chile in the Antofagasta Region The POLARBEAR experiment is mounted on the Huan Tran Telescope HTT at the James Ax Observatory in the Chajnantor Science Reserve The HTT is located near the Atacama Cosmology Telescope on the slopes of Cerro Toco at an altitude of nearly 5 200 m 17 100 ft 2 3 POLARBEARPart ofSimons Array Location s Atacama DesertCoordinates22 57 29 S 67 47 10 W 22 958064 S 67 786222 W 22 958064 67 786222Altitude5 200 m 17 100 ft Wavelength148 95 GHz 2 03 3 16 mm Built2010 2012 2010 2012 First light10 January 2012 Telescope stylecosmic microwave background experimentradio telescope Diameter2 5 m 8 ft 2 in Angular resolution3 5 arcminute Websitebolo wbr berkeley wbr edu wbr polarbear wbr Location of POLARBEAR Related media on Commons edit on Wikidata POLARBEAR was developed by an international collaboration which includes University of California Berkeley Lawrence Berkeley National Lab University of Colorado at Boulder University of California San Diego Imperial College Astroparticle and Cosmology Laboratory of the University of Paris 2019 KEK High Energy Accelerator Research Organization McGill University and Cardiff University Contents 1 History 2 See also 3 References 4 External linksHistory editThe instrument was first installed at the Combined Array for Research in Millimeter wave Astronomy site near Westgard Pass in California USA for an engineering run in 2010 It was then moved to its final destination in the Atacama Desert in September 2011 POLARBEAR saw first light on January 10 2012 and began its first observing season in April 2012 4 In October 2014 POLARBEAR published a measurement of B mode polarization at 150 GHz 5 These measurements focused on arcminute scale fluctuations likely sourced by gravitational lensing by intervening large scale structure Earlier in the year the BICEP2 project published related measurements of degree scale B mode polarization possibly sourced by primordial gravitational waves from cosmic inflation but they could not rule out cosmic dust as a cause POLARBEAR s published measurements focused on a small but clean patch of the sky where galactic foregrounds should be subdominant to gravitational lensing B modes The POLARBEAR team was able to report that the measured B mode polarization was of cosmic origin at a 97 2 confidence level by focusing their observing time on this small patch where they are highly sensitive to arcminute anisotropies However this observing strategy is insensitive to the larger degree scale inflationary B modes that BICEP2 and Keck Array have searched for 6 See also editAtacama Cosmology Telescope BICEP and Keck Array Brian Keating LiteBIRD Llano de Chajnantor Observatory Simons ObservatoryReferences edit Ade Peter A R et al 2015 POLARBEAR constraints on cosmic birefringence and primordial magnetic fields Physical Review D 92 12 123509 arXiv 1509 02461 doi 10 1103 PhysRevD 92 123509 S2CID 118546886 Keating B Moyerman S Boettger D Edwards J Fuller G Matsuda F Miller N Paar H Rebeiz G et al 2011 Ultra High Energy Cosmology with POLARBEAR 1110 2101 arXiv 1110 2101 Bibcode 2011arXiv1110 2101K a href Template Cite journal html title Template Cite journal cite journal a Cite journal requires journal help Lee Adrian T Tran Huan Ade Peter Arnold Kam Borrill Julian Dobbs Matt A Errard Josquin Halverson Nils Holzapfel William L Howard Jacob Jaffe Andrew Keating Brian Kermish Zigmund Linder Eric Miller Nathan Myers Mike Niarchou Anastasia Paar Hans Reichardt Christian Spieler Helmuth Steinbach Bryan Stompor Radek Tucker Carole Quealy Erin Richards Paul L Zahn Oliver Kodama Hideo Ioka Kunihito 28 August 2008 POLARBEAR Ultra high Energy Physics with Measurements of CMB Polarization AIP Conference Proceedings 1040 66 doi 10 1063 1 2981555 First Light in Chile University of California Berkeley Department of Physics Retrieved March 5 2012 The Polarbear Collaboration October 2014 A Measurement of the Cosmic Microwave Background B Mode Polarization Power Spectrum at Sub Degree Scales with POLARBEAR The Astrophysical Journal 794 2 171 arXiv 1403 2369 Bibcode 2014ApJ 794 171P doi 10 1088 0004 637X 794 2 171 S2CID 118598825 POLARBEAR project offers clues about origin of universe s cosmic growth spurt Christian Science Monitor October 21 2014 External links editPOLARBEAR website UCSD Cosmology website Retrieved from https en wikipedia org w index php title POLARBEAR amp oldid 1140538389, wikipedia, wiki, book, books, library,
