no code implementations • 22 Nov 2018 • William D. Jennings, Catherine A. Watkinson, Filipe B. Abdalla, Jason D. McEwen
We then present a proof-of-concept technique for mapping between two different simulations, exploiting our best emulator's fast prediction speed.
Cosmology and Nongalactic Astrophysics
1 code implementation • 2 Jul 2015 • Iftach Sadeh, Filipe B. Abdalla, Ofer Lahav
We present ANNz2, a new implementation of the public software for photometric redshift (photo-z) estimation of Collister and Lahav (2004), which now includes generation of full probability distribution functions (PDFs).
Cosmology and Nongalactic Astrophysics
no code implementations • 7 Dec 2013 • Shankar Agarwal, Filipe B. Abdalla, Hume A. Feldman, Ofer Lahav, Shaun A. Thomas
The overall precision of PkANN is set by the accuracy of our N-body simulations, at 5 per cent level for cosmological models with $\sum m_\nu<0. 5$ eV for all redshifts $z\leq2$.
Cosmology and Nongalactic Astrophysics
no code implementations • 8 Mar 2012 • Shankar Agarwal, Filipe B. Abdalla, Hume A. Feldman, Ofer Lahav, Shaun A. Thomas
We show that an optimally trained artificial neural network (ANN), when presented with a set of cosmological parameters (Omega_m h^2, Omega_b h^2, n_s, w_0, sigma_8, m_nu and redshift z), can provide a worst-case error <=1 per cent (for z<=2) fit to the non-linear matter power spectrum deduced through N-body simulations, for modes up to k<=0. 7 h/Mpc.
Cosmology and Nongalactic Astrophysics
1 code implementation • 27 Nov 2009 • Rachel Mandelbaum, Chris Blake, Sarah Bridle, Filipe B. Abdalla, Sarah Brough, Matthew Colless, Warrick Couch, Scott Croom, Tamara Davis, Michael J. Drinkwater, Karl Forster, Karl Glazebrook, Ben Jelliffe, Russell J. Jurek, I-hui Li, Barry Madore, Chris Martin, Kevin Pimbblet, Gregory B. Poole, Michael Pracy, Rob Sharp, Emily Wisnioski, David Woods, Ted Wyder
Our null detection allows us to place upper limits on the contamination of weak lensing measurements by blue galaxy intrinsic alignments that, for the first time, do not require significant model-dependent extrapolation from the z~0. 1 SDSS observations.
Cosmology and Nongalactic Astrophysics
