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Isolated Objects in Quadratic Gravity : From Action Principles to Observations.
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ISBN: 9783031489945 9783031489938 9783031489952 9783031489969 Year: 2024 Publisher: Cham : Springer International Publishing AG,

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This doctoral thesis by Samuele Silvervalle focuses on isolated objects within the framework of quadratic gravity, particularly examining static and spherically symmetric solutions. The work is situated within Stelle's theory, incorporating quadratic curvature terms as corrections to General Relativity. Through analytical and numerical methods, the thesis explores black holes, naked singularities, and non-vacuum solutions, assessing their geometrical properties and stability. It also analyzes the evaporation process of black holes and the implications of generalizing Stelle's theory with a scale-invariant approach. The research aims to provide insights into the behavior of compact objects under quadratic gravity, contributing to the broader understanding of gravitational theories beyond General Relativity. The intended audience includes physicists and researchers interested in advanced gravitational theories.


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Emergence in Condensed Matter and Quantum Gravity : A Nontechnical Review
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ISBN: 9783031098956 9783031098949 9783031098963 Year: 2022 Publisher: Cham Springer International Publishing

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This book surveys the science at a semipopular, Scientific American-level. It is even-handed with regard to competing directions of research and philosophical positions. It is hard to get even two people to agree on anything, yet a million billion water molecules can suddenly and abruptly coordinate to lock themselves into an ice crystal or liberate one another to billow outwards as steam. The marvelous self-organizing capacity of matter is one of the central and deepest puzzles of physics, with implications for all the natural sciences. Physicists in the past century have found a remarkable diversity of phases of matter-and equally remarkable commonalities within that diversity. The pace of discovery has, if anything, only quickened in recent years with the appreciation of quantum phases of matter and so-called topological order. The study of seemingly humdrum materials has made contact with the more exotic realm of quantum gravity, as theorists realize that the spacetime continuum may itself be a phase of some deeper and still unknown constituents. These developments flesh out the sometimes vague concept of the emergence-how exactly it is that complexity begets simplicity.


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Timeless Quantum Mechanics and the Early Universe
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ISBN: 9783030944483 9783030944476 9783030944490 9783030944506 Year: 2022 Publisher: Cham Springer International Publishing

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The book is based on the author's PhD thesis, which deals with the concept of time in quantum gravity and its relevance for the physics of the early Universe. It presents a consistent and complete new relational formulation of quantum gravity (more specifically, of quantum mechanics models with diffeomorphism invariance), which is applied to potentially observable cosmological effects. The work provides answers to the following questions: How can the dynamics of quantum states of matter and geometry be defined in a diffeomorphism-invariant way? What is the relevant space of physical states and which operators act on it? How are the quantum states related to probabilities in the absence of a preferred time? The answers can provide a further part of the route to constructing a fundamental theory of quantum gravity. The book is well-suited to graduate students as well as professional researchers in the fields of general relativity and gravitation, cosmology, and quantum foundations.


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Gravitational Waves from a Quantum Field Theory Perspective
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ISBN: 9783031237706 9783031237690 9783031237713 Year: 2023 Publisher: Cham : Springer International Publishing : Imprint: Springer,

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This book treats the subject of gravitational waves (GWs) production in binary stars or black-holes and in the early universe, using tools of quantum field theory which are familiar to graduate students and researchers in particle physics. A special focus is given to the generation of templates of gravitational wave signals from Feynman diagram calculations of transition amplitudes, which interests active researchers in GWs. The book presents field theory concepts, like supersymmetry realized in spinning binaries and soft-graviton theorems, that can have practical applications in novel GW signals, like the memory effect. The book also aims at specialists in both GWs and particle physics addressing cosmological models of phase transition and inflation that can be tested in observations at terrestrial and space based interferometers, pulsar timing arrays, and the cosmic microwave anisotropy observations.

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