IshakBoushaki, Mustapha
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Mustapha IshakBoushaki is an Associate Professor in the Department of Physics. He also serves on the faculty of the UT Dallas Cosmology, Relativity, and Astrophysics Group. Dr. IshakBoushaki's research interests include:
 Gravitational Lensing and applications to cosmology.
 The Acceleration of the expansion of the Universe: Cosmological Constant, Dark Energy.
 Constraining cosmological parameters and cosmological models using probes such as gravitational lensing, the cosmic microwave background (CMB), and supernova searches.
 General Relativity and Cosmological Exact Solutions to Einstein's Equations.
 Higher dimensional cosmological models.
 Projects at the intersection of modern cosmology and General Relativity.
 Junction conditions for matching spacetimes and constructing wormholes and spacetime thinshells.
 Computer Algebra (symbolic computing) and application to cosmology and general relativity.
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Recent Submissions

Testing Gravity Theories Using Tensor Perturbations
(American Physical Society, 20161221)Primordial gravitational waves constitute a promising probe of the very early Universe and the laws of gravity. We study in this work changes to tensormode perturbations that can arise in various proposed modified gravity ... 
Expansion and Growth of Structure Observables in a Macroscopic Gravity Averaged Universe
(American Physical Society, 20150330)We investigate the effect of averaging inhomogeneities on expansion and largescale structure growth observables using the exact and covariant framework of macroscopic gravity (MG). It is well known that applying the ... 
Effect of Inhomogeneities on High Precision Measurements of Cosmological Distances
(American Physical Society, 20141230)We study effects of inhomogeneities on distance measures in an exact relativistic Swisscheese model of the Universe, focusing on the distance modulus. The model has ΛCDM background dynamics, and the "holes" are nonsymmetric ... 
CrossCorrelation between Cosmic Microwave Background Lensing and Galaxy Intrinsic Alignment as a Contaminant to Gravitational Lensing CrossCorrelated Probes of the Universe
(American Physical Society, 20140325)We introduce here a crosscorrelation 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 ... 
Stringent Restriction from the Growth of LargeScale Structure on Apparent Acceleration in Inhomogeneous Cosmological Models
(20131219)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 ClassII Inhomogeneous Cosmological Models and the MatterDominated Era
(20120403)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. ... 
SelfCalibration Technique for ThreePoint Intrinsic Alignment Correlations in Weak Lensing Surveys
(20111115)The intrinsic alignment (IA) of galaxies has been shown to be a significant barrier to precision cosmic shear measurements. Recently, Zhang proposed a selfcalibration technique for the power spectrum to calculate the ... 
SelfCalibration for ThreePoint Intrinsic Alignment Autocorrelations in Weak Lensing Surveys
(20120608)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 ... 
SelfCalibrating the Gravitational ShearIntrinsic EllipticityIntrinsic Ellipticity CrossCorrelation
(20120601)We extend the 3point intrinsic alignment selfcalibration technique to the gravitational shearintrinsic ellipticityintrinsic ellipticity (GII) bispectrum. While significantly decreased from using crosscorrelations ... 
Spatial Curvature and Cosmological Tests of General Relativity
(American Physical Society, 20120323)It is wellknown that allowing for spatial curvature affects constraints on cosmological parameters such as the dark energy equation of state parameters. Here we study the effect of curvature on constraints on parameters ... 
LargeScale Growth Evolution in the Szekeres Inhomogeneous Cosmological Models with Comparison to Growth Data
(American Physical Society, 20121206)We use the Szekeres inhomogeneous cosmological models to study the growth of largescale structure in the universe including nonzero spatial curvature and a cosmological constant. In particular, we use the Goode and ...