In the current cosmological scenario, part of the linearly polarized emission of the CMB is expected to be rotational (B-modes). This component is due to tensor perturbations of the metric produced by primordial gravitational waves, which are generated a split-second after the Big Bang. The signal expected is of the order of <= 0.1 mu K, well below the non-rotational component of the polarization signal (E-modes), and beyond the sensitivity of present generation instruments. New, more sensitive instruments are developed in several labs, with the goal to measure the B-modes. Control of systematics and foregrounds will be the key to make the results of these experiments believable. In this paper we shortly outline BRAIN, a bolometric interferometer devoted to B-modes research, and its pathfinder experiment, devoted to test the Dome-C site.
Masi, S., de Bernardis, P., Giordano, C., Nati, F., Piacentini, F., Polenta, G., et al. (2005). Precision CMB polarization from Dome-c: The brain experiment. In Dome C: Astronomy and Astrophysics Meeting (pp.87-92). CEDEX A : E D P SCIENCES [10.1051/eas.2005014].
Precision CMB polarization from Dome-c: The brain experiment
Nati, F;GERVASI, MASSIMO;SIRONI, GIORGIO;TARTARI, ANDREA;ZANNONI, MARIO;
2005
Abstract
In the current cosmological scenario, part of the linearly polarized emission of the CMB is expected to be rotational (B-modes). This component is due to tensor perturbations of the metric produced by primordial gravitational waves, which are generated a split-second after the Big Bang. The signal expected is of the order of <= 0.1 mu K, well below the non-rotational component of the polarization signal (E-modes), and beyond the sensitivity of present generation instruments. New, more sensitive instruments are developed in several labs, with the goal to measure the B-modes. Control of systematics and foregrounds will be the key to make the results of these experiments believable. In this paper we shortly outline BRAIN, a bolometric interferometer devoted to B-modes research, and its pathfinder experiment, devoted to test the Dome-C site.
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