Item request has been placed! ×
Item request cannot be made. ×
loading  Processing Request

Tensor-to-scalar ratio forecasts for extended LiteBIRD frequency configurations

Item request has been placed! ×
Item request cannot be made. ×
loading   Processing Request
  • معلومة اضافية
    • Contributors:
      Universidad de Cantabria
    • بيانات النشر:
      EDP Sciences
    • الموضوع:
      2023
    • Collection:
      Universidad de Cantabria: UCrea
    • نبذة مختصرة :
      LiteBIRD is a planned JAXA-led cosmic microwave background (CMB) B-mode satellite experiment aiming for launch in the late 2020s, with a primary goal of detecting the imprint of primordial inflationary gravitational waves. Its current baseline focal-plane configuration includes 15 frequency bands between 40 and 402 GHz, fulfilling the mission requirements to detect the amplitude of gravitational waves with the total uncertainty on the tensor-to-scalar ratio, δr, down to δr < 0.001. A key aspect of this performance is accurate astrophysical component separation, and the ability to remove polarized thermal dust emission is particularly important. In this paper we note that the CMB frequency spectrum falls off nearly exponentially above 300 GHz relative to the thermal dust spectral energy distribution, and a relatively minor high frequency extension can therefore result in even lower uncertainties and better model reconstructions. Specifically, we compared the baseline design with five extended configurations, while varying the underlying dust modeling, in each of which the High-Frequency Telescope (HFT) frequency range was shifted logarithmically toward higher frequencies, with an upper cutoff ranging between 400 and 600 GHz. In each case, we measured the tensor-to-scalar ratio r uncertainty and bias using both parametric and minimum-variance component-separation algorithms. When the thermal dust sky model includes a spatially varying spectral index and temperature, we find that the statistical uncertainty on r after foreground cleaning may be reduced by as much as 30–50% by extending the upper limit of the frequency range from 400 to 600 GHz, with most of the improvement already gained at 500 GHz. We also note that a broader frequency range leads to higher residuals when fitting an incorrect dust model, but also it is easier to discriminate between models through higher χ² sensitivity. Even in the case in which the fitting procedure does not correspond to the underlying dust model in the sky, and when the ...
    • ISSN:
      0004-6361
      1432-0746
    • Relation:
      https://doi.org/10.1051/0004-6361/202346155; info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2019-110610RB-C21/ES/SISTEMA DE CALIBRACION PARA ESPACIO Y ESTUDIO COMPARATIVO DE TECNOLOGIAS PARA INSTRUMENTACION DEL CMB. INVESTIGACION DE FRONTERA EN COSMOLOGIA CON LITEBIRD Y QUIJOTE/; info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2020-120514GB-I00/ES/COSMOLOGIA DE PRECISION CON EL FONDO COSMICO DE MICROONDAS: QUIJOTE Y OTROS EXPERIMENTOS DE MICROONDAS EN EL OBSERVATORIO DEL TEIDE, Y LA MISION ESPACIAL LITEBIRD/; PID2019-110610RB-C21; PID2020-120514GB-I00; ProID2020010108; ICTP20210008; https://hdl.handle.net/10902/32875
    • الرقم المعرف:
      10.1051/0004-6361/202346155
    • الدخول الالكتروني :
      https://hdl.handle.net/10902/32875
      https://doi.org/10.1051/0004-6361/202346155
    • Rights:
      Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. ; http://creativecommons.org/licenses/by/4.0/ ; openAccess
    • الرقم المعرف:
      edsbas.CAAD55CA