8 papers
MG-NECOLA: A Field-Level Emulator for Gravity and Massive Neutrino Cosmologies
J. Bayron Orjuela-Quintana, Mauricio Reyes, Elena Giusarma +3
Accurate modeling of non-linear gravitational dynamics is essential for constraining extensions to the standard cosmological model using large-scale structure observations. While h…
Multifield dark energy: Interplay between curved field space and curved spacetime
Diego Gallego, J. Bayron Orjuela-Quintana
Exponential quintessence models motivated by string compactifications naturally involve both a dilatonic scalar and its axionic partner evolving on a curved field space, while spat…
Interpretable and physics-informed emulator for the linear matter power spectrum from machine learning
J. Bayron Orjuela-Quintana, Domenico Sapone, Savvas Nesseris
We present an interpretable emulator for the linear matter power spectrum (MPS) in the standard cosmological model CDM, constructed via a physics-informed symbolic regression f…
Inconsistencies of Tsallis Cosmology within Horizon Thermodynamics and Holographic Scenarios
Pedro M. Ibarbo-Perlaza., J. Bayron Orjuela-Quintana, Jose L. Palacios-Córdoba +1
We investigate the cosmological implications of Tsallis entropy in two widely discussed frameworks: the Cai-Kim thermodynamic derivation of the Friedman equations and the Tsallis h…
MG-NECOLA: Fast Neural Emulators for Modified Gravity Cosmologies
J. Bayron Orjuela-Quintana, Mauricio Reyes, Elena Giusarma +3
Observations of the large-scale structure (LSS) provide a powerful test of gravity on cosmological scales, but high-resolution N-body simulations of modified gravity (MG) are prohi…
Anisotropic Universes in Light of Background Cosmological Observations
Jose L. Palacios-Córdoba, J. Bayron Orjuela-Quintana, Gabriela A. Valencia-Zuñiga +1
The cosmological principle is a cornerstone of the standard cosmological model. However, recent observations suggest potential deviations from this assumption, hinting at a small a…