Essays about: "four-dimensional"

Showing result 11 - 15 of 30 essays containing the word four-dimensional.

  1. 11. Decay of solutions to the Klein-Gordon equation on some expanding cosmological spacetimes

    University essay from Lunds universitet/Teoretisk partikelfysik - Geonomgår omorganisation

    Author : Amol Sasane; [2019]
    Keywords : Klein-Gordon equation; general relativity; FLRW models; Schwarzschild-de Sitter; Reissner-Nordström-de Sitter; Physics and Astronomy;

    Abstract : The decay of solutions to the Klein-Gordon equation is studied in two expanding cosmological spacetimes, namely (1) the de Sitter universe in flat Friedmann-Lemaitre-Robertson-Walker (FLRW) form, and (2) the cosmological region of the Reissner-Nordström-de Sitter (RNdS) model. Using energy methods, for initial data with finite higher order energies, bounds on the decay rates of the solution are obtained. READ MORE

  3. 12. Review of compact spaces for type IIA/IIB theories and generalised fluxes

    University essay from Uppsala universitet/Institutionen för fysik och astronomi

    Author : Panizo Daniel; [2019]
    Keywords : supergravity; type IIA; type IIB; compactification; moduli space; T-duality; Buscher rules; six-torus; STU-models;

    Abstract : In the present project we study compactifications of type IIA/IIB string theories on toroidal orbifolds. We present the moduli space for N=1 four-dimensional reductions and its topological properties. To fix the value of all moduli, we will construct the most general holomorphic superpotential W using a set of T-dual iterations for the fluxes. READ MORE

  4. 13. The Antagonistic Battle between ‘Good’ and ‘Evil’ - A qualitative analysis of the interplay between digital hate culture and civil society counter efforts in the comment sections of Facebook

    University essay from Malmö universitet/Fakulteten för kultur och samhälle (KS)

    Author : Nadine Keller; [2019]
    Keywords : agonism; antagonism; counter speech; digital hate culture; right-wing extremism; hate speech; Facebook; Mouffe; qualitative content analysis; user comments;

    Abstract : Departing from the increasing threat that organized hate groups and their manipulative practices pose to contemporary society, this thesis seeks to unravel the workings of digital hate culture and to highlight the potential of civil society-led counter initiatives to combat the spread of hatred online. The research is based on a twofold qualitative content analysis. READ MORE

  5. 14. Clinical implementation of 4D Guidance during lung cancer treatment with radiation therapy

    University essay from KTH/Medicinteknik och hälsosystem

    Author : Jeanne Maret; [2018]
    Keywords : ;

    Abstract : Radiotherapy is one of the main treatment for lung cancer. This technique relies on killing the tumor cells by focusing electron or photon beam in the area. READ MORE

  6. 15. Assessment of hemodynamic parameters using 4D Flow MRI

    University essay from Lunds universitet/Matematik LTH

    Author : Mattias Andersson; [2018]
    Keywords : Hemodynamics; Hemodynamic Parameters; 4D Flow; 4D Flow MRI; Blood flow; Cardiac Disease; Heart Disease; MRI; Magnetic Resonance Imaging; Visualisation; Mathematics and Statistics;

    Abstract : Heart disease is one of the worldwide leading causes of death, and facilitating the work of physicians in this area is therefore of great importance. Imaging of the heart is one of many fields that is used for diagnosis and analysis of cardiac disease. READ MORE