POLARBEAR

Coordinates: 22°57′29″S 67°47′10″W / 22.958064°S 67.786222°W / -22.958064; -67.786222
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POLARBEAR
cosmic microwave background experiment
radio telescope Edit this on Wikidata
Diameter2.5 m (8 ft 2 in) Edit this at Wikidata
Angular resolution3.5 arcminute Edit this on Wikidata
Websitebolo.berkeley.edu/polarbear/ Edit this at Wikidata
POLARBEAR is located in Chile
POLARBEAR
Location of POLARBEAR
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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]

POLARBEAR was developed by an international collaboration which includes

University of Paris (2019), KEK (High Energy Accelerator Research Organization), McGill University, and Cardiff University
.

History

The 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

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

References

  1. S2CID 118546886
    .
  2. Bibcode:2011arXiv1110.2101K. {{cite journal}}: Cite journal requires |journal= (help
    )
  3. doi:10.1063/1.2981555
    .
  4. ^ "First Light in Chile!". University of California Berkeley Department of Physics. Retrieved March 5, 2012.
  5. S2CID 118598825
    .
  6. ^ "POLARBEAR project offers clues about origin of universe's cosmic growth spurt". Christian Science Monitor. October 21, 2014.

External links

Retrieved from "https://en.wikipedia.org/w/index.php?title=POLARBEAR&oldid=1229166922"