TY - JOUR 
A1 - Lonappan, A.I.
AU - Namikawa, T.
AU - Piccirilli, G.
AU - Diego Palazuelos, P.
AU - Ruiz Granda, M.
AU - Migliaccio, M.
AU - Baccigalupi, C.
AU - Bartolo, N.
AU - Beck, D.
AU - López Caniego, M.
AU - Et.al.
T1 - LiteBIRD science goals and forecasts: a full-sky measurement of gravitational lensing of the CMB
Y1 - 2024
SN - 1475-7516
UR - http://hdl.handle.net/11268/13007
AB - We explore the capability of measuring lensing signals in LiteBIRD full-sky polarization maps. With a 30 arcmin beam width and an impressively low polarization noise of 2.16 μK-arcmin,LiteBIRD will be able to measure the full-sky polarization of the cosmic microwave background (CMB) very precisely. This unique sensitivity also enables the reconstruction of a nearly full-sky lensing map using only polarization data, even considering its limited capability to capture small-scale CMB anisotropies. In this paper, we investigate the ability to construct a full-sky lensing measurement in the presence of Galactic foregrounds, finding that several possible biases from Galactic foregrounds should be negligible after component separation by harmonic-space internal linear combination. We find that the signal-to-noise ratio of the lensing is approximately 40 using only polarization data measured over 80% of the sky. This achievement is comparable to Planck's recent lensing measurement with both temperature and polarization and represents a four-fold improvement over Planck's polarization-only lensing measurement. The LiteBIRD lensing map will complement the Planck lensing map and provide several opportunities for cross-correlation science, especially in the northern hemisphere.
KW - Cosmología
KW - Actividad científica
LA - eng
ER -