Essays about: "universums expansion"

Showing result 1 - 5 of 7 essays containing the words universums expansion.

  1. 1. Galaxies as Clocks and the Universal Expansion

    University essay from KTH/Fysik

    Author : Anders Ahlström Kjerrgren; [2021]
    Keywords : cosmology; cosmic chronometers; universal expansion; Hubble parameter; differential ages; galaxy age; relative age; cosmic time; chi-square minimization; monte carlo sampling; gaussian processes; kosmologi; kosmisk kronometer; universums expansion; Hubbleparametern; differentiell ålder; galaxålder; relativ ålder; kosmisk tid; chi-2-minimering; monte carlo-sampling; gaussiska processer;

    Abstract : The Hubble parameter H(z) is a measure of the expansion rate of the universe at redshift z. One method to determine it relies on inferring the slope of the redshift with respect to cosmic time, where galaxy ages can be used as a proxy for the latter. This method is used by Simon et al. READ MORE

  2. 2. A Machine Learning Approach for Comprehending Cosmic Expansion

    University essay from KTH/Fysik

    Author : Ludvig Doeser; [2021]
    Keywords : Cosmology; Cosmic expansion; Galaxy Images; Machine learning; Kosmologi; kosmisk expansion; galaxbilder; maskininlärning;

    Abstract : This thesis aims at using novel machine learning techniques to test the dynamics of the Universe via the cosmological redshift-distance test. Currently, one of the most outstanding questions in cosmology is the physical cause of the accelerating cosmic expansion observed with supernovae. READ MORE

  3. 3. Nonequilibrium gauge field in Two Particle Irreducible real time formalism

    University essay from Lunds universitet/Institutionen för astronomi och teoretisk fysik; Lunds universitet/Teoretisk partikelfysik

    Author : Rasmus Hansen; [2019]
    Keywords : Gauge field; non-equilibrium; quantum field theory; Physics and Astronomy;

    Abstract : The purpose of this thesis is to study what effect a photon field has on the equations of motion and the decay of a charged scalar field in thermal equilibrium at finite temperature and outside of thermal equilibrium. To do this we calculate the two-particle irreducible effective action for the mean fields and propagators and derive their equations of motion. READ MORE

  4. 4. The Channeling Effect in Ultra-Thin dE-E Monolithic Silicon Telescopes

    University essay from Lunds universitet/Fysiska institutionen; Lunds universitet/Kärnfysik

    Author : Fredrik Parnefjord Gustafsson; [2017]
    Keywords : dead-layer; Channelling; The Channeling effect; Plasma effect; Nucleosynthesis; Astrophysics; Ultra-thin silicon detectors; Inhomogenous Big Bang; MST; deadlayer; Pelletron; 8Li; cross-section; Kikuchi pattern; Physics and Astronomy;

    Abstract : A new method has been proposed to study the low energy resonances of 8Li(alpha,n)11B at Ecm ≅ 0.5 MeV using dE-E Monolithic Silicon Telescopes (MSTs). Each telescope consists of five ultra-thin ∼1 µm (dE) silicon detector pads on a ∼500 µm (E) silicon detector. READ MORE

  5. 5. Elliptic flow of π, K, p and φ in Pb-Pb collisions at the Large Hadron Collider

    University essay from Lunds universitet/Partikelfysik; Lunds universitet/Fysiska institutionen

    Author : Maria Mårtenson; [2016]
    Keywords : Physics and Astronomy;

    Abstract : Data extracted from Pb-Pb collisions at √sNN = 2.76 TeV measured with the ALICE detector is used for analyzing the azimuthal anisotropic expansion in momentum space at different collision centralities for identified particles. The results are obtained with the event-plane method and an invariant mass analysis. READ MORE