Issue |
A&A
Volume 678, October 2023
|
|
---|---|---|
Article Number | A169 | |
Number of page(s) | 10 | |
Section | Cosmology (including clusters of galaxies) | |
DOI | https://doi.org/10.1051/0004-6361/202347358 | |
Published online | 18 October 2023 |
COSMOGLOBE: Towards end-to-end CMB cosmological parameter estimation without likelihood approximations
1
Institute of Theoretical Astrophysics, University of Oslo, Blindern, Oslo, Norway
e-mail: j.r.eskilt@astro.uio.no
2
Imperial Centre for Inference and Cosmology, Department of Physics, Imperial College London, Blackett Laboratory, Prince Consort Road, London SW7 2AZ, UK
3
Department of Physics, Indian Institute of Technology (BHU), Varanasi 221005, India
4
Dipartimento di Fisica, Università degli Studi di Milano, Via Celoria, 16, Milano, Italy
5
Instituto de Física, Universidade de São Paulo, 66318, CEP 05315-970, São Paulo, Brazil
6
Department of Physics and Astronomy, University of British Columbia, 6224 Agricultural Road, Vancouver, BC V6T1Z1, Canada
7
David A. Dunlap Department of Astronomy & Astrophysics, University of Toronto, 50 St. George Street, Toronto, ON M5S 3H4, Canada
8
Dunlap Institute for Astronomy & Astrophysics, University of Toronto, 50 St. George Street, Toronto, ON M5S 3H4, Canada
9
Waterloo Centre for Astrophysics, University of Waterloo, Waterloo, ON N2L 3G1, Canada
10
Department of Physics and Astronomy, University of Waterloo, Waterloo, ON N2L 3G1, Canada
11
Indian Institute of Astrophysics, Koramangala II Block, Bangalore 560034, India
Received:
4
July
2023
Accepted:
24
August
2023
We implement support for a cosmological parameter estimation algorithm in Commander and quantify its computational efficiency and cost. For a semi-realistic simulation similar to Planck LFI 70 GHz, we find that the computational cost of producing one single sample is about 20 CPU-hours and that the typical Markov chain correlation length is ∼100 samples. The net effective cost per independent sample is ∼2000 CPU-hours, in comparison with all low-level processing costs of 812 CPU-hours for Planck LFI and WMAP in COSMOGLOBE Data Release 1. Thus, although technically possible to run already in its current state, future work should aim to reduce the effective cost per independent sample by one order of magnitude to avoid excessive runtimes, for instance through multi-grid preconditioners and/or derivative-based Markov chain sampling schemes. This work demonstrates the computational feasibility of true Bayesian cosmological parameter estimation with end-to-end error propagation for high-precision CMB experiments without likelihood approximations, but it also highlights the need for additional optimizations before it is ready for full production-level analysis.
Key words: polarization / cosmic background radiation / cosmology: observations
© The Authors 2023
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.
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