We estimate the efficiency of mitigating the lensing B-mode polarization, the so-called delensing, for the LiteBIRD experiment with multiple external data sets of lensing-mass tracers. The current best bound on the tensor-to-scalar ratio, r, is limited by lensing rather than Galactic foregrounds. Delensing will be a critical step to improve sensitivity to r as measurements of r become more and more limited by lensing. In this paper, we extend the analysis of the recent LiteBIRD forecast paper to include multiple mass tracers, i.e., the CMB lensing maps from LiteBIRD and CMB-S4-like experiment, cosmic infrared background, and galaxy number density from Euclid- and LSST-like survey. We find that multi-tracer delensing will further improve the constraint on r by about 20%. In LiteBIRD, the residual Galactic foregrounds also significantly contribute to uncertainties of the B-modes, and delensing becomes more important if the residual foregrounds are further reduced by an improved component separation method.

Namikawa, T., Lonappan, A., Baccigalupi, C., Bartolo, N., Beck, D., Benabed, K., et al. (2024). LiteBIRD science goals and forecasts: improving sensitivity to inflationary gravitational waves with multitracer delensing. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS, 2024(6) [10.1088/1475-7516/2024/06/010].

LiteBIRD science goals and forecasts: improving sensitivity to inflationary gravitational waves with multitracer delensing

Conenna G.;Gervasi M.;Zannoni M.;
2024

Abstract

We estimate the efficiency of mitigating the lensing B-mode polarization, the so-called delensing, for the LiteBIRD experiment with multiple external data sets of lensing-mass tracers. The current best bound on the tensor-to-scalar ratio, r, is limited by lensing rather than Galactic foregrounds. Delensing will be a critical step to improve sensitivity to r as measurements of r become more and more limited by lensing. In this paper, we extend the analysis of the recent LiteBIRD forecast paper to include multiple mass tracers, i.e., the CMB lensing maps from LiteBIRD and CMB-S4-like experiment, cosmic infrared background, and galaxy number density from Euclid- and LSST-like survey. We find that multi-tracer delensing will further improve the constraint on r by about 20%. In LiteBIRD, the residual Galactic foregrounds also significantly contribute to uncertainties of the B-modes, and delensing becomes more important if the residual foregrounds are further reduced by an improved component separation method.
Articolo in rivista - Articolo scientifico
CMBR polarisation; gravitational waves and CMBR polarization;
English
2024
2024
6
010
reserved
Namikawa, T., Lonappan, A., Baccigalupi, C., Bartolo, N., Beck, D., Benabed, K., et al. (2024). LiteBIRD science goals and forecasts: improving sensitivity to inflationary gravitational waves with multitracer delensing. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS, 2024(6) [10.1088/1475-7516/2024/06/010].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/487039
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