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Self-Calibration Technique for Three-Point Intrinsic Alignment Correlations in Weak Lensing Surveys
(2011-11-15)
The intrinsic alignment (IA) of galaxies has been shown to be a significant barrier to precision cosmic shear measurements. Recently, Zhang proposed a self-calibration technique for the power spectrum to calculate the ...
Effect of Inhomogeneities on High Precision Measurements of Cosmological Distances
(American Physical Society, 2014-12-30)
We study effects of inhomogeneities on distance measures in an exact relativistic Swiss-cheese model of the Universe, focusing on the distance modulus. The model has ΛCDM background dynamics, and the "holes" are nonsymmetric ...
Expansion and Growth of Structure Observables in a Macroscopic Gravity Averaged Universe
(American Physical Society, 2015-03-30)
We investigate the effect of averaging inhomogeneities on expansion and large-scale structure growth observables using the exact and covariant framework of macroscopic gravity (MG). It is well known that applying the ...
Self-Calibration for Three-Point Intrinsic Alignment Autocorrelations in Weak Lensing Surveys
(2012-06-08)
The weak lensing signal (cosmic shear) has been shown to be strongly contaminated by the various types of galaxy intrinsic alignment (IA) correlations, which poses a barrier to precision weak lensing measurements. The ...
Cross-Correlation between Cosmic Microwave Background Lensing and Galaxy Intrinsic Alignment as a Contaminant to Gravitational Lensing Cross-Correlated Probes of the Universe
(American Physical Society, 2014-03-25)
We introduce here a cross-correlation term between CMB lensing and galaxy intrinsic alignment, noted here as φl. This effect acts as a contaminant to the cross correlation between CMB lensing and galaxy lensing. The latter ...
First Detection of the GI-Type of Intrinsic Alignments of Galaxies Using the Selfcalibration Method in a Photometric Galaxy Survey
(Institute of Physics, 2020-08-05)
Weak gravitational lensing is one of the most promising cosmological probes to constrain dark matter, dark energy, and the nature of gravity at cosmic scales. Intrinsic alignments (IAs) of galaxies have been recognized as ...
Self-Calibrating the Gravitational Shear-Intrinsic Ellipticity-Intrinsic Ellipticity Cross-Correlation
(2012-06-01)
We extend the 3-point intrinsic alignment self-calibration technique to the gravitational shear-intrinsic ellipticity-intrinsic ellipticity (GII) bispectrum. While significantly decreased from using cross-correlations ...
Large-Scale Growth Evolution in the Szekeres Inhomogeneous Cosmological Models with Comparison to Growth Data
(American Physical Society, 2012-12-06)
We use the Szekeres inhomogeneous cosmological models to study the growth of large-scale structure in the universe including nonzero spatial curvature and a cosmological constant. In particular, we use the Goode and ...
Stringent Restriction from the Growth of Large-Scale Structure on Apparent Acceleration in Inhomogeneous Cosmological Models
(2013-12-19)
Probes of cosmic expansion constitute the main basis for arguments to support or refute a possible apparent acceleration due to different expansion rates in the Universe as described by inhomogeneous cosmological models. ...
Growth of Structure in the Szekeres Class-II Inhomogeneous Cosmological Models and the Matter-Dominated Era
(2012-04-03)
This study belongs to a series devoted to using the Szekeres inhomogeneous models in order to develop a theoretical framework where cosmological observations can be investigated with a wider range of possible interpretations. ...