用于CMB测量的大型极化探索器（LSPE）：性能预测

论文标题

用于CMB测量的大型极化探索器（LSPE）：性能预测

The large scale polarization explorer (LSPE) for CMB measurements: performance forecast

论文作者

The LSPE collaboration, Addamo, G., Ade, P. A. R., Baccigalupi, C., Baldini, A. M., Battaglia, P. M., Battistelli, E. S., Baù, A., de Bernardis, P., Bersanelli, M., Biasotti, M., Boscaleri, A., Caccianiga, B., Caprioli, S., Cavaliere, F., Cei, F., Cleary, K. A., Columbro, F., Coppi, G., Coppolecchia, A., Cuttaia, F., D'Alessandro, G., De Gasperis, G., De Petris, M., Fafone, V., Farsian, F., Barusso, L. Ferrari, Fontanelli, F., Franceschet, C., Gaier, T. C., Galli, L., Gatti, F., Genova-Santos, R., Gerbino, M., Gervasi, M., Ghigna, T., Grosso, D., Gruppuso, A., Gualtieri, R., Incardona, F., Jones, M. E., Kangaslahti, P., Krachmalnicoff, N., Lamagna, L., Lattanzi, M., López-Caraballo, C. H., Lumia, M., Mainini, R., Maino, D., Mandelli, S., Maris, M., Masi, S., Matarrese, S., May, A., Mele, L., Mena, P., Mennella, A., Molina, R., Molinari, D., Morgante, G., Natale, U., Nati, F., Natoli, P., Pagano, L., Paiella, A., Panico, F., Paonessa, F., Paradiso, S., Passerini, A., Perez-de-Taoro, M., Peverini, O. A., Piacentini, F., Piccirillo, L., Pisano, G., Poletti, D., Presta, G., Realini, S., Reyes, N., Rubino-Martin, J. A., Sandri, M., Sartor, S., Pezzotta, F., Polenta, G., Rocchi, A., Schillaci, A., Signorelli, G., Siri, B., Soria, M., Spinella, F., Tapia, V., Tartari, A., Taylor, A. C., Terenzi, L., Tomasi, M., Tommasi, E., Tucker, C., Vaccaro, D., Vigano, D. M., Villa, F., Virone, G., Vittorio, N., Volpe, A., Watkins, R. E. J., Zacchei, A., Zannoni, M.

论文摘要

[删节]宇宙微波背景辐射的极化的测量是宇宙学的当前边界之一。特别是，对原始B模型的检测可以揭示早期宇宙中引力波的存在。目前，该组成部分的检测是探测说明宇宙早期演变的通货膨胀理论的最有希望的技术。我们介绍了大规模极化资源管理器（LSPE）的更新性能预测，该程序致力于测量CMB极化。 LSPE由两种仪器组成：带状仪，一种基于辐射仪的望远镜在特内里费岛的地面上，以及滑动（极化探索器的短波长仪器），一种基于重测的仪器，旨在在冬季北极平流层长度持续式气球上飞行。该计划是少数致力于观察北半球的计划之一，而大多数国际努力都集中在南半球的地面观察中。目前，测量时间定于2021/22冬季进行滑动，持续时间为15天，在2021年夏季进行了两年的观察。我们描述了两种仪器的主要特征，从而在对性能预测的影响方面确定了设计的最关键方面。我们估计每种仪器的预期灵敏度，并传播其对宇宙学参数敏感性的综合观测力，包括扫描策略的影响，组件分离，残留前景和部分天空覆盖范围。我们还设定了控制最关键的系统效应的要求，并描述了减轻其影响的技术。 LSPE可以达到张量表的敏感性$σ_R<0.01 $，并提高对其他宇宙参数的约束。

[Abridged] The measurement of the polarization of the Cosmic Microwave Background radiation is one of the current frontiers in cosmology. In particular, the detection of the primordial B-modes, could reveal the presence of gravitational waves in the early Universe. The detection of such component is at the moment the most promising technique to probe the inflationary theory describing the very early evolution of the Universe. We present the updated performance forecast of the Large Scale Polarization Explorer (LSPE), a program dedicated to the measurement of the CMB polarization. LSPE is composed of two instruments: Strip, a radiometer-based telescope on the ground in Tenerife, and SWIPE (Short-Wavelength Instrument for the Polarization Explorer) a bolometer-based instrument designed to fly on a winter arctic stratospheric long-duration balloon. The program is among the few dedicated to observation of the Northern Hemisphere, while most of the international effort is focused into ground-based observation in the Southern Hemisphere. Measurements are currently scheduled in Winter 2021/22 for SWIPE, with a flight duration up to 15 days, and in Summer 2021 with two years observations for Strip. We describe the main features of the two instruments, identifying the most critical aspects of the design, in terms of impact into performance forecast. We estimate the expected sensitivity of each instrument and propagate their combined observing power to the sensitivity to cosmological parameters, including the effect of scanning strategy, component separation, residual foregrounds and partial sky coverage. We also set requirements on the control of the most critical systematic effects and describe techniques to mitigate their impact. LSPE can reach a sensitivity in tensor-to-scalar ratio of $σ_r<0.01$, and improve constrains on other cosmological parameters.

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