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Various cosmological observations support not only cosmological inflation in the early universe, which is also known as exponential cosmic expansion, but also that the expansion of the late-time universe is accelerating. To explain this phenomenon, the existence of dark energy is proposed. In addition, according to the rotation curve of galaxies, the existence of dark matter, which does not shine, is also suggested. If primordial gravitational waves are detected in the future, the mechanism for realizing inflation can be revealed. Moreover, there exist two main candidates for dark matter. The first is a new particle, the existence of which is predicted in particle physics. The second is an astrophysical object which is not found by electromagnetic waves. Furthermore, there are two representative approaches to account for the accelerated expansion of the current universe. One is to assume the unknown dark energy in general relativity. The other is to extend the gravity theory to large scales. Investigation of the origins of inflation, dark matter, and dark energy is one of the most fundamental problems in modern physics and cosmology. The purpose of this book is to explore the physics and cosmology of inflation, dark matter, and dark energy.

de Sitter vacuum --- n/a --- Einstein-Aether theory of gravity --- Supernovae --- apparatus --- normal galaxies --- higher dimension gauged super-gravity black hole --- dark energy model --- cosmo–particle physics --- instruments --- Cosmic Microwave Background (CMB) temperature --- Dark Energy --- hyper-color --- quantum tunneling phenomenon --- spacetime symmetry --- parametrizations --- quantum gravity --- dynamical Chern–Simons modified gravity --- comparative planetology --- properties of specific particles --- particle physics --- dark matter --- Hawking radiation --- memory --- junction conditions --- cosmology --- composite dark matter --- dosmological parameters --- field theory --- Dark Matter --- cosmological model --- extragalactic objects and systems --- scalar–tensor gravity --- fundamental astronomy --- cosmoligical parameters --- cosmological parameters --- Baryon Acoustic Oscillation (BAO) --- dark atoms --- quantum optical systems --- brans-dicke theory --- dark energy models --- loop quantum cosmology --- dark energy --- galactic rotation curve --- astronomical and space-research instrumentation --- null hypersurfaces --- QCD --- quantum optics --- Hubble constant --- and components common to several branches of physics and astronomy --- statistical analysis --- cosmo-particle physics --- dynamical Chern-Simons modified gravity --- scalar-tensor gravity

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Within the second half of the last century, quantum cosmology concretely became one of the main research lines within gravitational theory and cosmology. Substantial progress has been made. Furthermore, quantum cosmology can become a domain that will gradually develop further over the next handful of decades, perhaps assisted by technological developments. Indications for new physics (i.e., beyond the standard model of particle physics or general relativity) could emerge and then the observable universe would surely be seen from quite a new perspective. This motivates bringing quantum cosmology to more research groups and individuals.This Special Issue (SI) aims to provide a wide set of reviews, ranging from foundational issues to (very) recent advancing discussions. Concretely, we want to inspire new work proposing observational tests, providing an aggregated set of contributions, covering several lines, some of which are thoroughly explored, some allowing progress, and others much unexplored. The aim of this SI is motivate new researchers to employ and further develop quantum cosmology over the forthcoming decades. Textbooks and reviews exist on the present subject, and this SI will complementarily assist in offering open access to a set of wide-ranging reviews. Hopefully, this will assist new interested researchers, in having a single open access online volume, with reviews that can help. In particular, this will help in selecting what to explore, what to read in more detail, where to proceed, and what to investigate further within quantum cosmology.

string cosmology --- quantum cosmology --- Wheeler-DeWitt equation --- loop quantum cosmology --- observations --- classical and quantum cosmology --- time --- quantum fields in curved spacetime --- Brans–Dicke theory --- bounce models --- de Broglie–Bohm interpretation --- quantum geometrodynamics --- extended theories of gravity --- dark energy singularities --- quantum gravity --- Hawking radiation --- entanglement entropy --- uniqueness of the quantization --- polymer quantum mechanics --- bounce --- no-boundary proposal --- instantons --- multiverse --- superspace --- third quantisation --- universe–antiuniverse pair --- weyl curvature hypothesis --- early universe cosmology --- singularity and bounce --- cyclic universe --- quantum fields --- backreaction effects --- supersymmetry --- noncommutativity --- generalized uncertainty principles --- canonical quantum gravity --- clocks --- noether symmetries --- ADM formalism --- exact solutions --- supersymmetric quantum mechanics --- shape invariant potentials --- supersymmetric quantum cosmology --- n/a --- Brans-Dicke theory --- de Broglie-Bohm interpretation --- universe-antiuniverse pair

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Dive into a mind-bending exploration of the physics of black holesBlack holes, predicted by Albert Einstein's general theory of relativity more than a century ago, have long intrigued scientists and the public with their bizarre and fantastical properties. Although Einstein understood that black holes were mathematical solutions to his equations, he never accepted their physical reality-a viewpoint many shared. This all changed in the 1960s and 1970s, when a deeper conceptual understanding of black holes developed just as new observations revealed the existence of quasars and X-ray binary star systems, whose mysterious properties could be explained by the presence of black holes. Black holes have since been the subject of intense research-and the physics governing how they behave and affect their surroundings is stranger and more mind-bending than any fiction.After introducing the basics of the special and general theories of relativity, this book describes black holes both as astrophysical objects and theoretical "laboratories" in which physicists can test their understanding of gravitational, quantum, and thermal physics. From Schwarzschild black holes to rotating and colliding black holes, and from gravitational radiation to Hawking radiation and information loss, Steven Gubser and Frans Pretorius use creative thought experiments and analogies to explain their subject accessibly. They also describe the decades-long quest to observe the universe in gravitational waves, which recently resulted in the LIGO observatories' detection of the distinctive gravitational wave "chirp" of two colliding black holes-the first direct observation of black holes' existence.The Little Book of Black Holes takes readers deep into the mysterious heart of the subject, offering rare clarity of insight into the physics that makes black holes simple yet destructive manifestations of geometric destiny.

Black holes (Astronomy) --- Frozen stars --- Compact objects (Astronomy) --- Gravitational collapse --- Stars --- A-frame. --- Acceleration. --- Accretion disk. --- Alice and Bob. --- Angular momentum. --- Astronomer. --- Atomic nucleus. --- Binary black hole. --- Binary star. --- Black hole information paradox. --- Black hole thermodynamics. --- Black hole. --- Calculation. --- Circular orbit. --- Classical mechanics. --- Closed timelike curve. --- Cosmological constant. --- Curvature. --- Cygnus X-1. --- Degenerate matter. --- Differential equation. --- Differential geometry. --- Doppler effect. --- Earth. --- Einstein field equations. --- Electric charge. --- Electric field. --- Electromagnetism. --- Ergosphere. --- Escape velocity. --- Event horizon. --- Excitation (magnetic). --- Frame-dragging. --- Galactic Center. --- General relativity. --- Gravitational acceleration. --- Gravitational collapse. --- Gravitational constant. --- Gravitational energy. --- Gravitational field. --- Gravitational redshift. --- Gravitational wave. --- Gravitational-wave observatory. --- Gravity. --- Hawking radiation. --- Inner core. --- Kerr metric. --- Kinetic energy. --- LIGO. --- Length contraction. --- Lorentz transformation. --- Magnetic field. --- Mass–energy equivalence. --- Maxwell's equations. --- Metric expansion of space. --- Metric tensor. --- Milky Way. --- Minkowski space. --- Negative energy. --- Neutrino. --- Neutron star. --- Neutron. --- Newton's law of universal gravitation. --- No-hair theorem. --- Nuclear fusion. --- Nuclear reaction. --- Orbit. --- Orbital mechanics. --- Orbital period. --- Penrose process. --- Photon. --- Physicist. --- Primordial black hole. --- Projectile. --- Quantum entanglement. --- Quantum gravity. --- Quantum mechanics. --- Quantum state. --- Quasar. --- Ray (optics). --- Rotational energy. --- Roy Kerr. --- Schwarzschild metric. --- Schwarzschild radius. --- Solar mass. --- Special relativity. --- Star. --- Stellar mass. --- Stephen Hawking. --- Stress–energy tensor. --- String theory. --- Supermassive black hole. --- Temperature. --- Theory of relativity. --- Thought experiment. --- Tidal force. --- Time dilation. --- Wavelength. --- White hole. --- Wormhole.