Updated Design of the CMB Polarization Experiment Satellite LiteBIRD

Sugai, Hajime; Ade, Peter A. R.; Akiba, Y.; Alonso, David; Arnold, K.; Aumont, J.; Austermann, J.; Baccigalupi, C.; Banday, A. J.; Banerji, R.; Barreiro, R. B.; Basak, S.; Beall, Jim; Beckman, S.; Bersanelli, M.; Borrill, J.; Boulanger, F.; Brown, Michael L.; Bucher, M.; Buzzelli, A.; Calabrese, E.; Casas, F. J.; Challinor, A.; Chan, V.; Chinone, Yuji; Cliche, J. F.; Columbro, F.; Cukierman, A.; Curtis, D. W.; Danto, Pascale; Bernardis, P. de; Haan, T. de; Petris, M. De; Dickinson, C.; Dobbs, M.; Dotani, Tadayasu; Duband, L.; Ducout, A.; Duff, Shannon M.; Duivenvoorden, Adri; Duval, J.M.; Ebisawa, Ken; Elleflot, T.; Enokida, H.; Eriksen, H. K.; Errard, Josquin; Essinger-Hileman, Thomas; Finelli⋆, F.; Flauger, Raphael; Franceschet, C.; Fuskeland, U.; Ganga, K.; Gao, J. R.; Génova-Santos, R. T.; Ghigna, Tommaso; Gómez, A.; Grądziel, M.; Grain, Julien; Grupp, F.; Gruppuso, A.; Gudmundsson, J. E.; Halverson, N. W.; Hargrave, Peter Charles; Hasebe, Takashi; Hasegawa, M.; Hattori, Makoto; Hazumi, M.; Henrot-Versillé, S.; Herranz, D.; Hill, Charles A.; Hilton, G. C.; Hirota, Yukimasa; Hivon, E.; Hložek, Renée; Hoang, Duc-Thuong; Hubmayr, Johannes; Ichiki, Kiyotomo; Iida, Teruhito; Imada, Hiroaki; Ishimura, Kosei; Ishino, H.; Jaehnig, G.; Jones, Michael E.; Kaga, Toru; Kashima, Shingo; Kataoka, Y.; Katayama, N.; Kawasaki, T.; Keskitalo, R.; Kibayashi, A.; Kikuchi, Takashi; Kimura, Kouji; Kisner, T. S.; Kobayashi, Yohei; Kogiso, Nozomu; Kogut, A.; Kohri, Kazunori; Komatsu, Eiichiro; Komatsu, Kunimoto; Konishi, Kuniaki; Krachmalnicoff, N.; Kuo, Chao-Lin; Kurinsky, Noah; Kushino, A.; Kuwata‐Gonokami, Makoto; Lamagna, L.; Lattanzi, M.; Lee, A. T.; Linder, Eric V.; Maffei, B.; Maino, D.; Maki, M.; Mangilli, A.; Martínez-González, E.; Masi, S.; Mathon, Romain; Matsumura, Tomotake; Mennella, A.; Migliaccio, M.; Minami, Y.; Mistuda, K.; Molinari, D.; Montier, L.; Morgante, G.; Mot, B.; Murata, Yasuhiro; Murphy, John A.; Nagai, Makoto; Nagata, Ryo; Nakamura, Shōgo; Namikawa, Toshiya; Natoli, P.; Nerval, S.; Nishibori, Toshiyuki; Nishino, Hitoshi; Nomura, Y.; Noviello, F.; O'Sullivan, Créidhe M.; Ochi, H.; Ogawa, H.; Ohsaki, Hiroyuki; Ohta, I.; Okada, Nozomi; Pagano, L.; Paiella, A.; Paoletti, D.; Patanchon, G.; Piacentini, F.; Pisano, G.; Polenta, G.; Poletti, D.; Prouvé, T.; Puglisi, Giuseppe; Rambaud, D.; Raum, Chris; Realini, S.; Remazeilles, M.; Roudil, G.; Rubiño-Martín, J. A.; Russell, M.; Sakurai, Haruyuki; Sakurai, Y.; Sandri, M.; Savini, G.; Scott, D.; Sekímoto, Yutaro; Sherwin, Blake D.; Shinozaki, Kazuo; Shiraishi, Maresuke; Shirron, Peter; Signorelli, G.; Smecher, G.; Spizzi, Pierre; Stever, S.; Stompor, R.; Sugiyama, S.; Suzuki, Aritoki; Suzuki, Junya; Switzer, Eric R.; Takaku, Ryota; Takakura, Hayato; Takakura, S.; Takeda, Yoichi; Taylor, Angela C.; Taylor, Ellen; Terao, K.; Thompson, K. L.; Thorne, Ben; Tomasi, M.; Tomida, H.; Trappe, N.; Tristram, M.; Tsuji, Masatsugu; Tsujimoto, Masahiro; Tucker, C.; Ullom, Joe; Uozumi, S.; Utsunomiya, Shin; Lanen, Jeff Van; Vermeulen, Gérard; Vielva, P.; Villa, F.; Vissers, Michael; Vittorio, N.; Voisin, F.; Walker, I. K.; Watanabe, Natsuki; Wehus, I. K.; Weller, J.; Westbrook, Ben; Winter, B.; Wollack, Edward J.; Yamamoto, Ryo; Yamasaki, Noriko Y.; Yanagisawa, Masahisa; Yoshida, Tetsuya; Yumoto, Junji; Zannoni, M.; Zonca, A.

doi:10.1007/s10909-019-02329-w

Cited by 92 publications

(92 citation statements)

References 32 publications

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“…Each superpixel thus contains 64 pixels of the HI4PI data. This superpixel size corresponds to 0°.46 on each side, comparable to the angular resolution of the Lite satellite for the studies of B-mode polarization and Inflation from cosmic background Radiation Detection (LiteBIRD) at CMB frequencies (Sugai 2020). We investigate the effect of slightly varying the N side parameter in Appendix B.…”

Section: Cloud Identificationmentioning

confidence: 99%

Maps of the Number of H i Clouds along the Line of Sight at High Galactic Latitude

Panopoulou

Lenz

2020

ApJ

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Characterizing the structure of the Galactic interstellar medium (ISM) in three dimensions is of high importance for accurate modeling of dust emission as a foreground to the cosmic microwave background (CMB). At high Galactic latitude, where the total dust content is low, accurate maps of the 3D structure of the ISM are lacking. We develop a method to quantify the complexity of the distribution of dust along the line of sight with the use of H I line emission. The method relies on a Gaussian decomposition of the H I spectra to disentangle the emission from overlapping components in velocity. We use this information to create maps of the number of clouds along the line of sight. We apply the method to (a) the high Galactic latitude sky and (b) the region targeted by the BICEP/Keck experiment. In the north Galactic cap we find on average three clouds per 0.2 square degree pixel, while in the south the number falls to 2.5. The statistics of the number of clouds are affected by intermediate-velocity clouds (IVCs), primarily in the north. IVCs produce detectable features in the dust emission measured by Planck. We investigate the complexity of H I spectra in the BICEP/Keck region and find evidence for the existence of multiple components along the line of sight. The data (doi: 10.7910/DVN/8DA5LH) and software are made publicly available and can be used to inform CMB foreground modeling and 3D dust mapping.Unified Astronomy Thesaurus concepts: Interstellar medium (847); Neutral hydrogen clouds (1099); Interstellar atomic gas (833)

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Section: Cloud Identificationmentioning

confidence: 99%

Maps of the Number of H i Clouds along the Line of Sight at High Galactic Latitude

Panopoulou

Lenz

2020

ApJ

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“…The Simons Observatory's Large Aperture Telescope is a Crossed-Dragone telescope with an approximately 6-m mean entrance pupil diameter and a mean effective focal length of 15.6 m. It shares a common optical and mechanical design with the CCAT-prime telescope and is currently under construction by Vertex Antennentechnik in Germany before transportation and installation at the Simons Observatory site in Chile. 1 The Crossed-Dragone design [3][4][5][6][7] supports large and unblocked optical throughput while meeting the Mizuguchi-Dragone condition [8,9] to minimize cross-polar response. Additionally, both the primary and secondary mirrors are perturbed from the basic conic sections used in a classic Crossed Dragone telescope design in such a way as to cancel first order coma in off-axis fields.…”

Section: A the Telescope Opticsmentioning

confidence: 99%

The Simons Observatory: modeling optical systematics in the Large Aperture Telescope

Gudmundsson¹,

Gallardo²,

Puddu³

et al. 2021

Appl. Opt.

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We present geometrical and physical optics simulation results for the Simons Observatory Large Aperture Telescope. This work was developed as part of the general design process for the telescope, allowing us to evaluate the impact of various design choices on performance metrics and potential systematic effects. The primary goal of the simulations was to evaluate the final design of the reflectors and the cold optics that are now being built. We describe nonsequential ray tracing used to inform the design of the cold optics, including absorbers internal to each optics tube. We discuss ray tracing simulations of the telescope structure that allow us to determine geometries that minimize detector loading and mitigate spurious near-field effects that have not been resolved by the internal baffling. We also describe physical optics simulations, performed over a range of frequencies and field locations, that produce estimates of monochromatic far-field beam patterns, which in turn are used to gauge general optical performance. Finally, we describe simulations that shed light on beam sidelobes from panel gap diffraction.

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“…Simons Array [25], Simons Observatory [26], Bicep Array [27]; CMB-S4 [28][29][30]; and space missions such as e.g. PIXIE [31] or LiteBird [32,33]).…”

Section: Jhep12(2020)161mentioning

confidence: 99%

Harmonic hybrid inflation

Carta

Righi

Welling

et al. 2020

J. High Energ. Phys.

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We present a mechanism for realizing hybrid inflation using two axion fields with a purely non-perturbatively generated scalar potential. The structure of the scalar potential is highly constrained by the discrete shift symmetries of the axions. We show that harmonic hybrid inflation generates observationally viable slow-roll inflation for a wide range of initial conditions. This is possible while accommodating certain UV arguments favoring constraints f ≲ MP and ∆ϕ60 ≲ MP on the axion periodicity and slow-roll field range, respectively. We discuss controlled ℤ2-symmetry breaking of the adjacent axion vacua as a means of avoiding cosmological domain wall problems. Including a minimal form of ℤ2-symmetry breaking into the minimally tuned setup leads to a prediction of primordial tensor modes with the tensor-to-scalar ratio in the range 10−4 ≲ r ≲ 0.01, directly accessible to upcoming CMB observations. Finally, we outline several avenues towards realizing harmonic hybrid inflation in type IIB string theory.

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Updated Design of the CMB Polarization Experiment Satellite LiteBIRD

Cited by 92 publications

References 32 publications

Maps of the Number of H i Clouds along the Line of Sight at High Galactic Latitude

Maps of the Number of H i Clouds along the Line of Sight at High Galactic Latitude

The Simons Observatory: modeling optical systematics in the Large Aperture Telescope

Harmonic hybrid inflation

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