Essays about: "Inhomogeneous Universe"

Found 4 essays containing the words Inhomogeneous Universe.

  1. 1. A Tension between the Early and Late Universe: Could Our Underdense Cosmic Neighbourhood Provide an Explanation?

    University essay from Uppsala universitet/Institutionen för fysik och astronomi

    Author : Sveva Castello; [2021]
    Keywords : Cosmology; Hubble tension; local void;

    Abstract : In recent years, the increasingly precise constraints on the value of the Hubble constant, H0, have highlighted a discrepancy between the results arising from early-time and late-time measurements. A potential solution to this so-called Hubble tension is the hypothesis that we reside in a cosmic void, i.e. READ MORE

  3. 2. Cosmological Implications of the Quantum SU(2) Yang-Mills Fields

    University essay from Lunds universitet/Teoretisk partikelfysik - Geonomgår omorganisation; Lunds universitet/Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation

    Author : Emil Boman; [2019]
    Keywords : Cosmic Inflation; Yang-Mills; SU 2 gauge fields; Physics and Astronomy;

    Abstract : We study the key properties of the quantum SU(2) Yang-Mills ground state and its possible role in the early Universe, in particular, as a driver of Cosmic Inflation. Using the effective action approach and separating the Yang-Mills field potential into homogeneous (condensate) and inhomogeneous (fluctuations) components, we reproduce the conformal-time solutions for the two different types of the Yang-Mills condensate in the minimum of the effective Lagrangian for generic initial conditions. READ MORE

  4. 3. 3+1 Approach to Cosmological Perturbations : Deriving the First Order Scalar Perturbations of the Einstein Field Equations

    University essay from Karlstads universitet/Fakulteten för hälsa, natur- och teknikvetenskap (from 2013)

    Author : Söderkvist Vermelin Wilhelm; [2016]
    Keywords : physics; astronomy; theoretical physics; perturbation; cosmology; cosmological perturbations; 3 1 formalism; first order perturbation; perturbation theory; universe; fysik; astronomi; teoretisk fysik; störning; störningsräkning; kosmologi; kosmologiska störningar; kosmologisk störningsräkning; 3 1 formalismen; första ordningens störningar; störningsteori; universum;

    Abstract : Experimental data suggest that the universe is homogeneous and isotropic on sufficiently large scales. An exact solution of the Einstein field equations exists for a homogeneous and isotropic universe, also known as a Friedmann-Lemaître-Robertson-Walker (FLRW) universe. READ MORE

  5. 4. Supernova Cosmology in an Inhomogeneous Universe

    University essay from Fysikum; Naturvetenskapliga fakulteten

    Author : Rahul Gupta; [2010]
    Keywords : Inhomogeneous Cosmology; Supernovae; Type Ia Supernova; Dark Energy; Accelerated Expansion; Accelerated Universe; Inhomogeneous Universe; Monte Carlo; Ray Tracing;

    Abstract : The propagation of light beams originating from synthetic ‘Type Ia’ supernovae, through an inhomogeneous universe with simplified dynamics, is simulated using a Monte-Carlo Ray-Tracing method. The accumulated statistical (redshift-magnitude) distribution for these synthetic supernovae observations, which is illustrated in the form of a Hubble diagram, produces a luminosity profile similar to the form predicted for a Dark-Energy dominated universe. READ MORE