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Showing result 1 - 5 of 17 essays matching the above criteria.

1. 1. Cosmological Horizons and the Unruh Effect

   University essay from Uppsala universitet/Teoretisk fysik

   Author : Niklas Engelhardt Önne; [2023]
   Keywords : Unruh effect; quantum scalar fields; Bogoliubov transformations; accelerated observers; Minkowski spacetime; cosmological horizons; Rindler observers; special relativity; QFT; Unruh-effekten; skalära kvantfält; Bogoliubov-transformationer; accelererande referenssystem; Minkowski rumtid; kosmologiska horisonter; Rindlerobservatörer; speciell relativitetsteori; QFT;

   Abstract : The black hole information paradox, which states that the evaporation of black holes due to Hawking radiation results in a violation of the conservation of quantum information, is arguably one of the most fundamental problems in all of modern physics. Through the equivalence principle, the essence of the problem can be understood and studied in the context of much simpler flat spacetime (described by the theory of special relativity); in this context the Hawking radiation takes the form of the so-called Unruh effect, a thermal effect in the vacuum of a Minkowski quantum field theory that can be measured by accelerated observers. READ MORE

3. 2. Gravitational Decoherence in Macroscopic Quantum Systems

   University essay from Uppsala universitet/Teoretisk fysik

   Author : Niklas Engelhardt Önne; [2023]
   Keywords : decoherence; gravitational decoherence; quantum mechanics; quantum physics; macroscopic quantum mechanics; macroscopic quantum physics; gravity; general relativity; gravitational time dilation; quantum-to-classical transition; nonrelativistic quantum mechanics; quantum gravity; dekoherens; gravitationell dekoherens; kvantmekanik; kvantfysik; makroskopisk kvantmekanik; makroskopisk kvantfysik; gravitation; allmän relativitetsteori; gravitationell tidsdilatation; övergången från kvantfysik till klassisk fysik; ickerelativistisk kvantmekanik; kvantgravitation;

   Abstract : The problem of how quantum mechanics gives rise to classicality has been debated for more than a century. A commonly proposed solution is decoherence, i.e. the gradual decay of superpositions in open quantum systems due to their inevitable interaction with their environment. READ MORE

4. 3. Black Holes and Scalar Fields : A study of a massive scalar field around a black hole

   University essay from Uppsala universitet/Teoretisk fysik

   Author : Abdulmasih Ghazal; [2022]
   Keywords : Black holes; scalar field; General relativity; special relativity; spacetime; cosmology; Schwarzschild; Schrödinger equation; Svart hål; relativitetsteori; skalär fält; rumtid; Shrödinger; Schwarzschild.;

   Abstract : Black holes are one of the most interesting objects in the universe, and studying these objects should give exciting results. This research will investigate the General Theory of Relativity, explaining the essence of the theory needed for deriving solutions for a Schwarzschild black hole. READ MORE

5. 4. Matter-streams as sources of the Kerr metric

   University essay from Lunds universitet/Teoretisk partikelfysik - Geonomgår omorganisation

   Author : Julian Boy; [2022]
   Keywords : General Relativity; Black holes; Physics; Kerr metric; Physics and Astronomy;

   Abstract : An introduction to the thin-shell formalism and distributional approach to General Relativity is provided. The formalism is utilized to investigate possible distributions of matter that can act as a source to the Kerr metric. READ MORE

6. 5. General Relativity and Dynamical Universes

   University essay from Uppsala universitet/Teoretisk fysik

   Author : Kajsa Fransson; [2021]
   Keywords : cosmology; general relativity; scale factor; friedmann equation;

   Abstract : The aim of this report is to explore different models of cosmology, depending on components as matter, radiation and dark energy. To be able to investigate the behaviour and age of these model universes, it is necessary to solve the Friedmann equation. READ MORE