Essays about: "apparent horizon"

Showing result 1 - 5 of 7 essays containing the words apparent horizon.

  1. 1. Gravitational Collapse of a Massless Scalar Field in a Theory of Minimally Modified Gravity

    University essay from KTH/Fysik

    Author : Atabak Fathe Jalali; [2024]
    Keywords : Theoretical physics; astrophysics; modified gravity; minimally modified gravity; gravitational collapse; VCDM; scalar collapse; apparent horizon; numerical relativity; Teoretisk fysik; astrofysik; modifierad gravitation; minimalt modifierad gravitation; gravitationskollaps; VCDM; skalär kollaps; uppenbar horisont; numerisk relativitet;

    Abstract : This thesis explores the spherically symmetric gravitational collapse of a massless scalar field in a minimally modified gravity theory denoted VCDM (V replaces $\Lambda$ in the $\Lambda$CDM abbreviation), a class of theories propagating the same degrees of freedom as general relativity at the expense of broken 4D diffeomorphism invariance. Numerical evolution of the equations of motion reveals that for small initial scalar profile amplitudes, no black hole forms from the collapse. READ MORE

  3. 2. Recent Progress on the Black Hole Information Paradox

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

    Author : Eivind Hilmen Jørstad; [2021]
    Keywords : Black Holes; Hawking Radiation; Entanglement Entropy; Black Hole Information Paradox; Dilaton Gravity; Quasiparticles; Physics and Astronomy;

    Abstract : The black hole information paradox is of central importance in the study of quantum gravity. The paradox states that quantum fields surrounding a black hole behave in ways that run into conflict with the unitarity of quantum mechanical time evolution. READ MORE

  4. 3. Transition Matrices Conditional on Macroeconomic Cycles: A Portfolio Stress-Test Application

    University essay from Göteborgs universitet/Graduate School

    Author : Jesper Karlsson; [2018-07-04]
    Keywords : Risk Management; Migration Analysis; Intensity Models; IFRS 9; Basel Accords; Portfolio Stress Test;

    Abstract : Transition matrices show the probabilities of credit rating migrations for a pool of ratings within a particular industry, geographical area, time-horizon, etc. Regulation, in the form of Basel accords, has opted for standards in banking that among other techniques use transition matrices, and thus the probability of default, for internally-based risk-assessment, as well as incorporating the external credit rating in the capital requirement calculation. READ MORE

  5. 4. Testing the Adaptive Markets Hypothesis : An examination of the variability of the risk-return trade-off over time and in different market environments

    University essay from Södertörns högskola/Företagsekonomi

    Author : Steve Sherlock; [2018]
    Keywords : Adaptive markets hypothesis; risk-return trade-off; volatility anomaly; market environment;

    Abstract : A new hypothesis, The Adaptive Markets Hypothesis (AMH), is applied to the Swedish stockmarket context by testing the variability of the risk-return trade-off over different investment horizons and market environments. Yearly returns and volatility are measured on OMXS30 index between1986 and 2017 over a variety of different investment horizons. READ MORE

  6. 5. Evaluation of emergency ordering policies at Syncron

    University essay from Lunds universitet/Produktionsekonomi

    Author : Niklas Jonsson Åberg; Staffan Theander; [2017]
    Keywords : Technology and Engineering;

    Abstract : The aim of our research has been to identify what prevents Syncron from implementing a single item emergency ordering policy in their inventory management system, GIM. Emergency ordering is defined here as the ability to use two supply sources, a normal one and a faster more expensive emergency source. READ MORE