Kooperativer Bibliotheksverbund

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Format: 1 online resource (394 pages)

Edition: 1st ed.

ISBN: 3-031-55098-6

Note: Intro -- Preface -- Contents -- Modifications of General Relativity: Scalar Tensor Theories -- Exact Black Hole Solutions in Higher Order Scalar Tensor Theories -- 1 Black Holes and Scalar Tensor Theories -- 2 Horndeski and Beyond -- 2.1 Horndeski Theories -- 2.2 Degenerate Higher-Order Scalar-Tensor (DHOST) Theories -- 3 Stealth Black Holes and Their Disformal and Conformal Transformations -- 3.1 Generic Stealth Schwarzschild in Horndeski Theories -- 3.2 A Stealth Kerr Black Hole in a GR Like DHOST Theory -- 3.3 Disformal Kerr Metric -- 3.4 Conformal Kerr Metric: Cosmological Black Holes -- 4 Black Holes Beyond Ricci Flat Metrics -- 4.1 Parity and Shift-Symmetric Theories -- 4.2 Non-parity Symmetric Theories -- 5 Summary -- References -- Compact Objects in EsGB Theory and Beyond -- 1 Introduction -- 2 Compact Objects in GR and Einstein-Scalar Theory -- 2.1 Black Holes -- 2.2 Wormholes -- 2.3 Particle-Like Solutions -- 3 The Einstein-Scalar-GB Theory -- 3.1 Black-Hole Solutions in Einstein-Scalar-GB Theory -- 3.2 Wormholes in Einstein-Scalar-GB Theory -- 3.3 Particle-Like Solutions in Einstein-Scalar-GB Theory -- 4 Compact Objects in (Beyond) Horndeski Theory -- 5 Conclusions -- References -- Dynamics of Scalarization -- 1 Introduction -- 2 Scalar-Gauss-Bonnet Gravity-Field Equations and Time Evolution -- 2.1 Scalar Field Evolution in Decoupling Limit Approximation -- 2.2 Field Equations in Spherical Symmetry -- 2.3 Mechanisms of Scalarization -- 3 Scalarization of Isolated Compact Objects -- 3.1 Scalar Field Dynamics in the Decoupling Limit Approximation -- 3.2 Scalar Field Evolution on the Background of a Neutron Star -- 3.3 Beyond Decoupling Limit Approximation -- 4 Conclusion -- References -- EFT Approach to Black Hole Scalarization and Its Compatibility with Cosmic Evolution -- 1 Introduction -- 2 The Model and Black Hole Scalarization. , 3 Perturbations on a FLRW Background -- 4 General Relativity as a Cosmic Attractor -- 5 Discussion and Conclusions -- References -- Conformal Renormalization and Energy Functionals in Anti-De Sitter Gravity -- 1 Introduction -- 2 Kounterterms in AdS Gravity -- 3 Counterterms Versus Kounterterms: A Comparison -- 4 Beyond Kounterterms: Conformal Renormalization -- 5 Energy Functionals from Conformal Gravity in Four Dimensions -- 6 Conclusions -- References -- Black Hole Spectroscopy -- Black-Hole Spectroscopy: Quasinormal Modes, Ringdown Stability and the Pseudospectrum -- 1 Introduction -- 2 Black-Hole Perturbation Theory and Quasinormal Modes -- 2.1 Quasinormal Mode Detection Status -- 3 Early Evidence of a Spectral Instability -- 4 The Need for Non-modal Tools: The Pseudospectrum -- 4.1 The Mathematical Notion of the Pseudospectrum -- 4.2 Hydrodynamics and the Pseudospectrum -- 4.3 Black Holes and Their Pseudospectrum in a Nutshell -- 4.4 A Pseudospectrum Calculator Primer -- 5 Pseudospectrum of Black Holes -- 5.1 Pöschl-Teller Potential: A Toy Model -- 5.2 Schwarzschild Black Holes -- 5.3 Reissner-Nordström Black Holes -- 6 Pseudospectrum of Horizonless Exotic Compact Objects -- 6.1 Spherically-Symmetric Horizonless Compact Objects: A Simplistic Approach -- 6.2 Pseudospectrum of Horizonless Objects with a Pöschl-Teller Potential -- 6.3 Pseudospectrum of Horizonless Compact Objects -- 7 Destabilizing the Fundamental Quasinormal Mode -- 8 Destabilized Fundamental Mode Detection in Ringdown Signals -- 8.1 Ringdown Waveform Stability -- 8.2 Implications on Black-Hole Spectroscopy -- 9 Conclusions and Outlook -- References -- WKB Method and Quasinormal Modes of String-Theoretical D-Dimensional Black Holes -- 1 Introduction and Summary -- 2 Quasinormal Modes -- 2.1 Dissipative Systems and Quasinormal Modes -- 2.2 Quasinormal Modes of Black Holes. , 3 WKB Theory: A Review -- 3.1 Defining Purpose and Schrödinger Like Equations -- 3.2 Analytic Continuation and Stokes Lines -- 4 A String-Corrected Black Hole and Its Perturbations -- 4.1 Physical Origin -- 4.2 The Metric -- 4.3 Gravitational Perturbations and Quasinormal Modes -- 5 Quasinormal Modes in the Eikonal Limit -- 5.1 Definition and Analysis of upper QQ -- 5.2 WKB Approximation -- 5.3 Quasinormal Frequencies Computation -- 6 Quasinormal Modes in the Asymptotic Limit -- 6.1 Variable Change and Perturbation Theory -- 6.2 WKB Theory Set up -- 6.3 Stokes Lines Topology -- 6.4 Boundary Conditions -- 6.5 The Monodromy Method -- 6.6 The Big Contour -- 6.7 The Small Contour -- 6.8 Equating Monodromies: The Final Result -- References -- Observational Signals of Compact Objects -- Spacetime Geometry of Rotating Boson Stars and KBHsSH -- 1 Introduction -- 2 Theory -- 2.1 Action and Equations of Motion -- 2.2 Charges -- 2.3 Scalar Field Ansatz -- 2.4 Note on Self-interaction -- 3 Rotating Boson Stars -- 3.1 Metric Ansatz and Boundary Conditions -- 3.2 Charges -- 3.3 Fluid Description and Co-moving Frame -- 4 KBHsSH -- 4.1 Metric Ansatz and Boundary Conditions -- 4.2 Charges -- 4.3 Domain of Existence -- 5 Equatorial Circular Orbits -- 5.1 Static Ring -- 5.2 Degenerate Prograde Stable -- 5.3 Discontinuous Prograde Stable -- 5.4 Discontinuous Circular Orbits -- 6 Conclusions -- References -- Seven Years of LIGO-Virgo Science -- 1 Signal and Noises -- 1.1 Thermal Noise -- 1.2 Seismic Noise -- 1.3 Gravity Gradient Noise -- 1.4 Signals -- 2 The First Discoveries -- 2.1 Localization -- 2.2 GW170817 -- 3 O3 Run and Beyond -- 3.1 Tests of General Relativity -- 3.2 ``Exceptional'' Events -- 3.3 Other Searches -- 4 Conclusions -- References. , Astrophysics of Radio Sources: Analysis of 21cm Post-reionization Signals and Modeling of FRBs as PBHs with Magnetic Fields -- 1 Introduction -- 2 Extracting HI Information from Sky Maps -- 2.1 Caracterizing the 21cm Post-reionization Signals -- 2.2 Foreground Signals -- 2.3 Modeling the Foreground Removal Process -- 2.4 Statistical Estimation of the 21cm Signals -- 3 Bispectrum in 21-cm Intensity Mapping -- 3.1 Bispectrum Patterns and Foreground Residues -- 4 Primordial Black Holes with Magnetic Fields as a Candidate for Fast Radio Bursts -- 5 Magnetized Space Times -- References -- BINGO-ABDUS: A Radiotelescope to Unveil the Dark Sector of the Universe -- 1 Introduction -- 2 The BINGO Project -- 2.1 Scientific Organization -- 3 The ABDUS Project-Advanced Bingo Dark Universe Studies -- 4 Other Similar Projects -- References -- Gravitational Wave Astronomy -- Machine Learning Applications in Gravitational Wave Astronomy -- 1 Introduction -- 2 ANN-Accelerated Surrogate Models -- 2.1 Constructing a Surrogate Model -- 2.2 Accelerating the Surrogate Model Using ANNs -- 3 Efficient Surrogate Models Using Autoencoders -- 4 GW Detection with Deep Residual Networks -- 4.1 Training and Test Datasets -- 4.2 Deep Residual Networks -- 4.3 Detection of BBH Injections in Real Noise -- 5 ANN Surrogate Models of Neutron Star Mass-Radius Relations in Alternative Theories of Gravity -- 6 Training and Testing -- 6.1 Speed-Up -- 7 Conclusions -- References -- Features in the Inflaton Potential and the Spectrum of Cosmological Perturbations -- 1 Introduction -- 2 Beyond Slow-Roll Single-Field Inflation -- 2.1 Amplification -- 2.2 Oscillatory Patterns -- 2.3 Step-Like Transitions Versus Approximate Inflection Points -- 3 Turns Without Slow-Roll in Two-Field Inflation -- 3.1 Background and Perturbations Evolution -- 3.2 Enhancement -- 3.3 Describing Turns in Field Space. , 3.4 The Quantitative Features of the Evolution -- 4 Inflationary Models with Special Features -- 4.1 Step-Like Features in the Inflaton Potential -- 4.2 Approximate Inflection-Point Inflationary Models -- 5 Secondary GWs -- 5.1 GWs in Perturbation Theory -- 5.2 GWs Beyond Perturbation Theory and During EMD -- 6 Conclusions -- References.

Additional Edition: ISBN 3-031-55097-8

Language: English