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An Emulator for the Lyman-alpha Forest
Simeon Bird, Keir K. Rogers, Hiranya V. Peiris +3
We present methods for interpolating between the 1-D flux power spectrum of the Lyman- forest, as output by cosmological hydrodynamic simulations. Interpolation is necessary for…
Bayesian emulator optimisation for cosmology: application to the Lyman-alpha forest
Keir K. Rogers, Hiranya V. Peiris, Andrew Pontzen +3
The Lyman-alpha forest provides strong constraints on both cosmological parameters and intergalactic medium astrophysics, which are forecast to improve further with the next genera…
The one-dimensional power spectrum from the SDSS DR14 Ly forests
Solène Chabanier, Nathalie Palanque-Delabrouille, Christophe Yèche +15
We present a measurement of the 1D Ly forest flux power spectrum, using the complete Baryon Oscillation Spectroscopic Survey (BOSS) and first extended-BOSS (eBOSS) quasars at $z…
Cosmological Hydrodynamic Simulations with Suppressed Variance in the Lyman- Forest Power Spectrum
Lauren Anderson, Andrew Pontzen, Andreu Font-Ribera +3
We test a method to reduce unwanted sample variance when predicting Lyman- (ly) forest power spectra from cosmological hydrodynamical simulations. Sample variance arises due…
Statistical properties of paired fixed fields
Francisco Villaescusa-Navarro, Sigurd Naess, Shy Genel +6
The initial conditions of cosmological simulations are commonly drawn from a Gaussian ensemble. The limited number of modes inside a simulation volume gives rise to statistical flu…
The Cosmological Bias Factor of Damped Lyman Alpha systems: Dependence on Metal Line Strength
Ignasi Pérez-Ràfols, Jordi Miralda-Escudé, Andreu Arinyo-i-Prats +2
We measure the cosmological bias factor of DLAs from their cross-correlation with the Ly forest absorption, as a function of the DLA metal strength, defined from an average of e…