Essays about: "Quantum Vacuum"

Showing result 1 - 5 of 25 essays containing the words Quantum Vacuum.

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. An Introduction to Symmetry Protected Topological Phases

   University essay from Uppsala universitet/Teoretisk fysik

   Author : David Petrovic; [2023]
   Keywords : ;

   Abstract : In this thesis, we aim to display characteristics of symmetry protected topological phases within quantum mechanics (QM). Building on well known aspects of QM, we relate the formalism to basic group representation theory, and review the connection between projective symmetries and protected vacuum degeneracies. READ MORE

4. 3. Path Integrals in Quantum Mechanics and Low-Dimensional QFT

   University essay from Uppsala universitet/Teoretisk fysik

   Author : Johanna Adbo; [2023]
   Keywords : QFT; path integrals; quantum mechanics; kvantfältteori; vägintegraler; kvantmekanik;

   Abstract : The focus of this thesis is to introduce the path integral and some of its applications. One interpretation of quantum mechanics is that a microscopic system which moves from an initial- to a final state moves through each possible intermediate state. READ MORE

5. 4. Quantum state tomography of attosecond electron wavepackets

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

   Author : Ron Demjaha; [2022]
   Keywords : quantum physics; quantum state tomography; atomic physics; quantum optics; density matrix; entanglement; state mixing; fano resonances; two-photon absorption; Physics and Astronomy;

   Abstract : In this master thesis, a broad theoretical description is done of a novel quantum state tomography protocol called KRAKEN. This protocol is meant for the determination of the density matrix of an electronic state created by absorption of XUV radiation in the vicinity of a Fano resonance. At first, a description of the KRAKEN protocol is provided. READ MORE

6. 5. Polarizability and Orientation Dynamics of Small Proteins

   University essay from Uppsala universitet/Materialteori

   Author : Ebba Koerfer; [2022]
   Keywords : Protein orientation; single-particle imaging; polarizability; orientation dynamics; rigid rotor model;

   Abstract : Proteins often carry an intrinsic electric dipole moment, which can interact with external electric fields and cause protein motion. Previous research has found that the orientation of small proteins in gas phase can be controlled in a static electric field. READ MORE