Alireza Hojjati
University of British Columbia
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Publication
Featured researches published by Alireza Hojjati.
Journal of Cosmology and Astroparticle Physics | 2011
Alireza Hojjati; Levon Pogosian; Gong-Bo Zhao
We introduce a patch to the commonly used public codes CAMB and CosmoMC that allows the user to implement a general modification of the equations describing the growth of cosmological perturbations, while preserving the covariant conservation of the energy-momentum. This patch replaces the previously publicly released code MGCAMB, while also extending it in several ways. The new version removes the limitation of late-time-only modifications to the perturbed Einstein equations, and includes several parametrizations introduced in the literature. To demonstrate the use of the patch, we obtain joint constraints on the neutrino mass and parameters of a scalar-tensor gravity model from CMB, SNe and ISW data as measured from the correlation of CMB with large scale structure.
The Astrophysical Journal | 2015
Kai Liao; Tommaso Treu; Phil Marshall; C. D. Fassnacht; N. Rumbaugh; Gregory Dobler; Amir Aghamousa; V. Bonvin; F. Courbin; Alireza Hojjati; N. Jackson; Vinay L. Kashyap; S. Rathna Kumar; Eric V. Linder; Kaisey S. Mandel; Xiao-Li Meng; G. Meylan; Leonidas A. Moustakas; T. P. Prabhu; Andrew Romero-Wolf; Arman Shafieloo; Aneta Siemiginowska; C. S. Stalin; Hyungsuk Tak; M. Tewes; David A. van Dyk
We present the results of the first strong lens time delay challenge. The motivation, experimental design, and entry level challenge are described in a companion paper. This paper presents the main challenge, TDC1, which consisted of analyzing thousands of simulated light curves blindly. The observational properties of the light curves cover the range in quality obtained for current targeted efforts (e.g.,~COSMOGRAIL) and expected from future synoptic surveys (e.g.,~LSST), and include simulated systematic errors. \nteamsA\ teams participated in TDC1, submitting results from \nmethods\ different method variants. After a describing each method, we compute and analyze basic statistics measuring accuracy (or bias)
Monthly Notices of the Royal Astronomical Society | 2016
Gong-Bo Zhao; Yuting Wang; A. Ross; Sarah Shandera; Will J. Percival; Kyle S. Dawson; Jean-Paul Kneib; Adam D. Myers; Joel R. Brownstein; Johan Comparat; Timothée Delubac; Pengyuan Gao; Alireza Hojjati; Kazuya Koyama; Cameron K. McBride; Andres Meza; Jef frey A. Newman; Nathalie Palanque-Delabrouille; Levon Pogosian; Francisco Prada; Graziano Rossi; Donald P. Schneider; Hee-Jong Seo; C. Tao; Dandan Wang; Christophe Yèche; H. Y. Zhang; Yuecheng Zhang; Xu Zhou; Fangzhou Zhu
A
Physical Review D | 2013
Yuting Wang; David Wands; Lixin Xu; Josue De-Santiago; Alireza Hojjati
, goodness of fit
Monthly Notices of the Royal Astronomical Society | 2016
Hendrik Hildebrandt; Ami Choi; Catherine Heymans; Chris Blake; Thomas Erben; Lance Miller; Reiko Nakajima; L. van Waerbeke; Massimo Viola; Axel Buddendiek; Joachim Harnois-Déraps; Alireza Hojjati; Benjamin Joachimi; Shahab Joudaki; Thomas D. Kitching; Christian Wolf; Stephen Gwyn; Nicholas Johnson; K. Kuijken; Z. Sheikhbahaee; Alexandru Tudorica; H. K. C. Yee
\chi^2
Physical Review D | 2012
Alireza Hojjati; Gong-Bo Zhao; Levon Pogosian; Alessandra Silvestri; Robert Crittenden; Kazuya Koyama
, precision
Monthly Notices of the Royal Astronomical Society | 2016
Joachim Harnois-Déraps; Tilman Tröster; Alireza Hojjati; Ludovic Van Waerbeke; Marika Asgari; Ami Choi; Thomas Erben; Catherine Heymans; Hendrik Hildebrandt; Thomas D. Kitching; Lance Miller; Reiko Nakajima; Massimo Viola; S. Arnouts; Jean Coupon; Thibaud Moutard
P
Physical Review D | 2012
Alireza Hojjati; Levon Pogosian; Alessandra Silvestri; Starla Talbot
, and success rate
Monthly Notices of the Royal Astronomical Society | 2017
Alireza Hojjati; Tilman Tröster; Joachim Harnois-Déraps; Ian G. McCarthy; Ludovic Van Waerbeke; Ami Choi; Thomas Erben; Catherine Heymans; Hendrik Hildebrandt; G. Hinshaw; Yin-Zhe Ma; Lance Miller; Massimo Viola; Hideki Tanimura
f
Journal of Cosmology and Astroparticle Physics | 2015
Alireza Hojjati; Ian G. McCarthy; Joachim Harnois-Déraps; Yin-Zhe Ma; Ludovic Van Waerbeke; G. Hinshaw; Amandine M. C. Le Brun
. For some methods we identify outliers as an important issue. Other methods show that outliers can be controlled via visual inspection or conservative quality control. Several methods are competitive, i.e., give
