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CMB Lensing and Large Scale Structure Bias as a Probe of Beyond and CDM Cosmology

Hassani, Farbod | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 48594 (04)
  4. University: Sharif University of Technology
  5. Department: Physics
  6. Advisor(s): Baghram, Shant; Firouzjahi, Hassan
  7. Abstract:
  8. The standard model of Cosmology known as CDM is established as a cornerstone of modern cosmology. The Cosmic Microwave Background radiation (CMB) and Large Scale Structure (LSS) Observations indicate that almost all observations can be described by a 6-parameter standard model with an initial condition of almost Gaussian, isotropic, scale invariant and adiabatic which can be sourced by inflationary models. Recent observations of Planck collaboration shows almost no deviation from standard picture of single field slow roll inflation. Despite the success of the standard model, the physics of early universe, the nature of dark matter and dark energy is still unknown. The large scale structure surveys open a new horizon to test the cosmological models in different redshifts and sub- CMB scales. One of the recent developments of the field is the detection of the lensed CMB map with unprecedent accuracy. The CMB lensing is caused by the gravitational effect of structures in the line of sight on the photons from the last scattering surface. CMB lensing in its own can be used as a unique observational tool to constrain the early universe physics, matter distribution in the universe and growth of structures in large scales. On the other hand galaxy lensing is a very important observation for constraining on cosmological models mostly their behaviour in small scales and late time. In this thesis we use the CMB lensing signal and cross correlation of CMB lensing and galaxy lensing signal to probe early Universe physics, specially studying the effect of the deviation from scale invariant and the deviation from isotropic initial conditions. we propose that the CMB lensing power spectrum and CMB lensing cross correlation with galaxy lensing can be used as a unique probe for detection of the anomalies found in CMB temperature map (dipole, cold spot, ...) and their scale dependence. If the anomalies are not the statistical flukes, it is worth to investigate their effects on CMB and LSS related observation in order to understand their origin and probably the non-trivial inflationary model
  9. Keywords:
  10. Standard Cosmology ; Cosmic Microwave Background (CMB) ; Gravitational Lensing ; Cosmic Microwave Background (CMB)Anisotropy ; Cross Correlation

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