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Table 3 The main polarization experiments, their typical observational frequencies, and the upper limits on the B-mode polarization are illustrated.

From: Stochastic backgrounds of relic gravitons: a theoretical appraisal

Experiments

Years

Pivot frequencies

Upper limits on BB

Dasi [24–26]

2000-2003

26-36 GHz

(2π) ≤ 50(μK)2

Boomerang [168]

2003

145 GHz

/(2π) ≤ 8.6(μK)2

Maxipol [169, 170]

2003

140 GHz

/(2π) ≤ 112.3(μK)2

Quad [31–33]

2007

100/150 GHz

/(2π) ≤ 10(μK)2

Cbi [29, 30]

2002-2005

26-36 GHz

/(2π) ≤ 3.76(μK)2

Capmap [27, 28]

2004-2005

35-46/84-100 GHz

/(2π) ≤ 4.8(μK)2

Wmap [3, 4, 6]

2001-2006

23-94 GHz

/(2π) ≤ 0.5(μK)2