Papers › The e-MANTIS emulator: fast predictions of the non-linear matter power spectrum in...
The e-MANTIS emulator: fast predictions of the non-linear matter power spectrum in f(R)CDM cosmology
Iñigo Sáez-Casares, Yann Rasera, Baojiu Li
The archive published only this paper's code-link row. Authors, date and abstract are from arXiv's metadata (CC0), read from the Kaggle arXiv metadata snapshot of 2026-09-12 where its title matched the archive's; the title is the archive's.
In order to probe modifications of gravity at cosmological scales, one needs accurate theoretical predictions. N-body simulations are required to explore the non-linear regime of structure formation but are very time consuming. In this work, we release a new public emulator, dubbed e-MANTIS, that performs an accurate and fast interpolation between the predictions of f(R) modified gravity cosmological simulations, run with ECOSMOG. We sample a wide 3D parameter space given by the current background scalar field value 10⁻⁷<|f_(R₀)|<10⁻⁴, matter density 0.24<Ωₘ<0.39, and primordial power spectrum normalisation 0.6<σ₈<1.0, with 110 points sampled from a Latin Hypercube. For each model we perform pairs of f(R)CDM and ΛCDM simulations covering an effective volume of (560 h⁻¹Mpc)³ with a mass resolution of ∼2 ×10¹⁰ h⁻¹ M_⊙. We build an emulator for the matter power spectrum boost B(k)=P_(f(R))(k)/P_(ΛCDM)(k) using a Gaussian Process Regression method. The boost is mostly independent of h, nₛ, and Ω_b, which reduces the dimensionality of the relevant cosmological parameter space. Additionally, it is more robust against statistical and systematic errors than the raw power spectrum, thus strongly reducing our computational needs. According to our dedicated study of numerical systematics, the resulting emulator has an estimated maximum error of 3% across the whole cosmological parameter space, for scales 0.03 hMpc⁻¹ < k < 7 hMpc⁻¹, and redshifts 0 < z < 2, while in most cases the accuracy is better than 1%. Such an emulator could be used to constrain f(R) gravity with weak lensing analyses
Code
Repository list and official/mentioned flags are the archive's, frozen 2025-07-28. Reachability, where shown, is from one Syntology probe window (2026-09-16 to 2026-09-18); repositories not probed show nothing. GitHub stars are not tracked.
Code Syntology ran Syntology
Not run by Syntology. Nothing on this page verifies that the listed code works.
Results from the paper archive 2025-07-28
No leaderboard rows for this paper in the archive.
Report a problem or propose a change · a person checks every report against the paper or source before anything changes; decisions are listed on /corrections