LiteBIRD: A Satellite for the Studies of B-Mode Polarization and Inflation from Cosmic Background Radiation Detection
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LiteBIRD is a candidate satellite for a strategic large mission of JAXA. With its expected launch in the middle of the 2020s with a H3 rocket, LiteBIRD plans to map the polarization of the cosmic microwave background radiation over the full sky with unprecedented precision. The full success of LiteBIRD is to achieve \(\delta r < 0.001\), where \(\delta r\) is the total error on the tensor-to-scalar ratio r. The required angular coverage corresponds to \(2 \le \ell \le 200\), where \(\ell \) is the multipole moment. This allows us to test well-motivated cosmic inflation models. Full-sky surveys for 3 years at a Lagrangian point L2 will be carried out for 15 frequency bands between 34 and 448 GHz with two telescopes to achieve the total sensitivity of 2.5 \(\upmu \)K arcmin with a typical angular resolution of 0.5\(^\circ \) at 150 GHz. Each telescope is equipped with a half-wave plate system for polarization signal modulation and a focal plane filled with polarization-sensitive TES bolometers. A cryogenic system provides a 100 mK base temperature for the focal planes and 2 K and 5 K stages for optical components.
KeywordsCosmic inflation Cosmic microwave background B-mode polarization Primordial gravitational wave Quantum gravity Satellite
This work was supported by the ISAS/JAXA Phase-A1 program, by MEXT KAKENHI Grant Numbers JP15H05891, 21111002, by World Premier International Research Center Initiative (WPI), MEXT and by the JSPS Core-to-Core program. Development of the sub-Kelvin instrument was supported by the NASA mission of opportunity Phase A program.
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