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Large Scale Structures as a Probe of Physics of Early Universe

Ansarifard, Mohammad | 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 50265 (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 with nearly Gaussian, isotropic, scale invariant and adiabatic initial conditions describes the cosmological observations. However, the study of any deviation from the mentioned conditions will open up a new window to the physics of early universe. In this work we study the effect of the oscillatory and step in potential inflationary models in late time large scale structure observations. Almost we study the matter power spectrum, number density of the structures, the halo bias an the bulk flow in mentioned models. We assert that inflationary models with step functions which deviates from the standard model in small scales l ≤ 1Mpc can be confirmed by Large scale data as well. We also discuss the effectiveness of CMB lensing as a probe of deviation from standard model.The results are showing that imprints of mentioned models are observable with todays data on correlation function. also the effect of mentioned models are negligible on weak gravitational lensing if the change in power spectrum occur in small k and so the future surveys could not observe these models. In contrary, if the change in power spectrum be in large k, the effect could be related to small scale tensions of CDM and these effects are observable in future data of weak gravitational lensing
  9. Keywords:
  10. Cosmology ; Scale Invariance ; Inflationary Cosmology ; Universe Large-Scale Structure ; Oscillatory Power Spectrum

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