Modified Gravity-GADGET: A new code for cosmological hydrodynamical simulations of modified gravity models

By E. Puchwein, Marco Baldi, Volker Springel. 2013

144 citations recorded by the source corpus.

We present a new massively parallel code for N-body and cosmological hydrodynamical simulations of modified gravity models. The code employs a multigrid-accelerated Newton-Gauss-Seidel relaxation solver on an adaptive mesh to efficiently solve for perturbations in the scalar degree of freedom of the modified gravity model. As this new algorithm is implemented as a module for the P-Gadget3 code, it can at the same time follow the baryonic physics included in P-Gadget3, such as hydrodynamics, radiative cooling and star formation. We demonstrate that the code works reliably by applying it to simple test problems that can be solved analytically, as well as by comparing cosmological simulations to results from the literature. Using the new code, we perform the first non-radiative and radiative cosmological hydrodynamical simulations of an f(R)-gravity model. We also discuss the impact of AGN feedback on the matter power spectrum, as well as degeneracies between the influence of baryonic processes and modifications of gravity.

Subfields: Astronomy and Astrophysics

View Paper: https://www.semanticscholar.org/paper/50c08293885ea985c3c1e51502d002b7bb7ed8a8

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Citations in the corpus

General relativity and cosmic structure formation (2015, background): “A number of numerical codes has been developed for particular models [11, 12, 13, 14], yet a general framework would be desirable.”
Accurate halo-model matter power spectra with dark energy, massive neutrinos and modified gravitational forces (2016, background): “This is in qualitative agreement with results presented by Puchwein et al. (2013) and may be good news considering the relative uncertainty and expense of simulations that contain hydrodynamics and baryonic feedback; it may be sufficient to run detailed hydrodynamic simulations with feedback for…”
gevolution: a cosmological N-body code based on General Relativity (2016, methodology): “Despite these subtleties, models beyond ΛCDM have been studied with simulation codes using some modified Newtonian approaches [14–17].”
Cosmology and Fundamental Physics with the Euclid Satellite (2012, background): “2012c), theMGGADGET (Puchwein et al. 2013), and the ISIS (Llinares et al.”
Cosmological tests of modified gravity (2015, methodology): “Hydrodynamical simulations have been developed for f(R) gravity and symmetron models [293, 296, 298] but the degeneracy between modified gravity effects and baryonic physics remains to be understood.”