ECOSMOG

ECOSMOG: An Efficient Code for Simulating Modified Gravity. We introduce a new code, ECOSMOG, to run N-body simulations for a wide class of modified gravity and dynamical dark energy theories. These theories generally have one or more new dynamical degrees of freedom, the dynamics of which are governed by their (usually rather nonlinear) equations of motion. Solving these non-linear equations has been a great challenge in cosmology. Our code is based on the RAMSES code, which solves the Poisson equation on adaptively refined meshes to gain high resolutions in the high-density regions. We have added a solver for the extra degree(s) of freedom and performed numerous tests for the f(R) gravity model as an example to show its reliability. We find that much higher efficiency could be achieved compared with other existing mesh/grid-based codes thanks to two new features of the present code: (1) the efficient parallelisation and (2) the usage of the multigrid relaxation to solve the extra equation(s) on both the regular domain grid and refinements, giving much faster convergence even under much more stringent convergence criteria. This code is designed for performing high-accuracy, high-resolution and large-volume cosmological simulations for modified gravity and general dark energy theories, which can be utilised to test gravity and the dark energy hypothesis using the upcoming and future deep and high-resolution galaxy surveys.


References in zbMATH (referenced in 11 articles )

Showing results 1 to 11 of 11.
Sorted by year (citations)

  1. Hernández-Aguayo, César; Ruan, Cheng-Zong; Li, Baojiu; Arnold, Christian; Baugh, Carlton M.; Klypin, Anatoly; Prada, Francisco: Fast full (N)-body simulations of generic modified gravity: derivative coupling models (2022)
  2. Aviles, Alejandro; Valogiannis, Georgios; Rodriguez-Meza, Mario A.; Cervantes-Cota, Jorge L.; Li, Baojiu; Bean, Rachel: Redshift space power spectrum beyond Einstein-de Sitter kernels (2021)
  3. Becker, Christoph; Eggemeier, Alexander; Davies, Christopher T.; Li, Baojiu: Proca-stinated cosmology. II: Matter, halo, and lensing statistics in the vector Galileon (2021)
  4. Sosa Nuñez, Fidel; Niz, Gustavo: On the fast random sampling and other properties of the three point correlation function in galaxy surveys (2020)
  5. Dar, Furqan; de Rham, Claudia; Deskins, J. Tate; Giblin, John T. Jr; Tolley, Andrew J.: Scalar gravitational radiation from binaries: Vainshtein mechanism in time-dependent systems (2019)
  6. Reverberi, Lorenzo; Daverio, David: \textttfRevolution-- relativistic cosmological simulations in (f(R)) gravity. I: Methodology (2019)
  7. Adhikari, Susmita; Sakstein, Jeremy; Jain, Bhuvnesh; Dalal, Neal; Li, Baojiu: Splashback in galaxy clusters as a probe of cosmic expansion and gravity (2018)
  8. Bose, Sownak; Li, Baojiu; Barreira, Alexandre; He, Jian-hua; Hellwing, Wojciech A.; Koyama, Kazuya; Llinares, Claudio; Zhao, Gong-Bo: Speeding up (N)-body simulations of modified gravity: chameleon screening models (2017)
  9. Munshi, Dipak: The integrated bispectrum in modified gravity theories (2017)
  10. Winther, Hans A.; Koyama, Kazuya; Manera, Marc; Wright, Bill S.; Zhao, Gong-Bo: COLA with scale-dependent growth: applications to screened modified gravity models (2017)
  11. Barreira, Alexandre: Structure formation in modified gravity cosmologies (2016)