4.7 Article

The impact of modified gravity on the Sunyaev-Zeldovich effect

Journal

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 501, Issue 3, Pages 4565-4578

Publisher

OXFORD UNIV PRESS
DOI: 10.1093/mnras/staa3941

Keywords

methods: numerical; galaxies: clusters: general; cosmic background radiation; dark energy; cosmology: theory

Funding

  1. Durham Centre for Doctoral Training in Data Intensive Science - UK Science and Technology Facilities Council (STFC) [ST/P006744/1]
  2. Durham University
  3. European Research Council [ERC-StG-716532-PUNCA]
  4. STFC [ST/T000244/1, ST/P000541/1, ST/R000832/1]
  5. Excellence Cluster ORIGINS - Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany's Excellence Strategy -EXC 2094 [390783311]
  6. BEIS capital funding via STFC [ST/K00042X/1, ST/P002293/1, ST/R002371/1, ST/S002502/1]

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This study explores the effects of two different modified gravity theories on the Sunyaev-Zeldovich effect, finding that one theory significantly enhances power spectra. Baryonic physics plays a crucial role in suppressing power on certain angular scales, emphasizing the need for further understanding of baryonic processes.
We study the effects of two popular modified gravity theories, which incorporate very different screening mechanisms, on the angular power spectra of the thermal (tSZ) and kinematic (kSZ) components of the Sunyaev-Zeldovich effect. Using the first cosmological simulations that simultaneously incorporate both screened modified gravity and a complete galaxy formation model, we find that the tSZ and kSZ power spectra are significantly enhanced by the strengthened gravitational forces in Hu-Sawicki f(R) gravity and the normal-branch Dvali-Gabadadze-Porrati model. Employing a combination of non-radiative and full-physics simulations, we find that the extra baryonic physics present in the latter acts to suppress the tSZ power on angular scales l greater than or similar to 3000 and the kSZ power on all tested scales, and this is found to have a substantial effect on the model differences. Our results indicate that the tSZ and kSZ power can be used as powerful probes of gravity on large scales, using data from current and upcoming surveys, provided sufficient work is conducted to understand the sensitivity of the constraints to baryonic processes that are currently not fully understood.

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