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Lorentzian Wormholes: From Einstein to Hawking
Preface Acknowledgments I. Background: 1. Introduction 2. General Relativity 3. Quantum Field Theory 4. Units and Natural Scales II. History: 5. The Einstein-Rosen Bridge 6. Spacetime Foam 7. The…
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Acoustic black holes: horizons, ergospheres and Hawking radiation
It is a deceptively simple question to ask how acoustic disturbances propagate in a non-homogeneous flowing fluid. Subject to suitable restrictions, this question can be answered by invoking the…
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Understanding the shape of Java software
TLDR
The results of the first in-depth study of the structure of Java programs are presented, finding evidence that some relationships follow power-laws, while others do not.
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Analogue Gravity
TLDR
The history, aims, results, and future prospects for the various analogue models of gravity are discussed, including a particularly simple example of an analogue model and the rich history and complex tapestry of models discussed in the literature.
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Black-bounce to traversable wormhole
So-called “regular black holes” are a topic currently of considerable interest in the general relativity and astrophysics communities. Herein we investigate a particularly interesting regular black…
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Black holes in general relativity
What is going on (as of August 2008) at the interface between theoretical general relativity, string-inspired models, and observational astrophysics? Quite a lot. In this mini-survey I will make a…
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Essential and inessential features of Hawking radiation
There are numerous derivations of the Hawking effect available in the literature. They emphasise different features of the process, and sometimes make markedly different physical assumptions. This…
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Traversable wormholes from surgically modified Schwarzschild spacetimes
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Stable gravastars—an alternative to black holes?
The 'gravastar' picture developed by Mazur and Mottola is one of a very small number of serious challenges to our usual conception of a 'black hole'. In the gravastar picture there is effectively a…
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Analogue gravity from Bose-Einstein condensates
We analyse prospects for the use of Bose–Einstein condensates as condensedmatter systems suitable for generating a generic ‘effective metric’, and for mimicking kinematic aspects of general…
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