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Ultralight Dark Matter Dynamics With An Absorbing Black Hole
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Book Synopsis Ultralight Dark Matter Dynamics with an Absorbing Black Hole by : Ningyuan Lillian Guo
Download or read book Ultralight Dark Matter Dynamics with an Absorbing Black Hole written by Ningyuan Lillian Guo and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ultralight dark matter (ULDM) is an interesting alternative to the standard cold dark matter scenario that admits new physics on kiloparsec scales. In this scenario, dark matter particles have a mass m ~ O(1022 eV), and their dynamics is governed in the non-relativistic weak- eld limit by the Schr odinger-Poisson equation. Coherent "solitons" are predicted to form at the centre of dark matter halos. This thesis presents eigenvalue solutions to the Schr odinger-Poisson equation for purely self-gravitating ULDM, as well as ground state solutions (solitons) for the Schr odinger-Poisson equation with added external central potential, and with attractive ULDM self-interaction. Relationship between soliton density and black hole mass as well as soliton mass is explored. A new pseudospectral solver is then presented for the Schr odinger-Poisson equation under spherical symmetry. It is used to model a central black hole absorbing mass from the soliton by adding a localised imaginary potential, which can be tuned to the absorption model. This allows the rst qualitative dynamical simulations of solitons governed by the Schr odinger- Poisson equation loosing mass to a black hole. Due to a lack of a well-established theory for black hole absorption of ULDM, an empirical model is investigated, showing that it can lead to a range of dynamical behaviours. ULDM central density can change substantially as the black hole mass evolves, and the overall soliton lifetime may be a function of the dynamically changing pro le. A moderate absorption rate is found to be most e cient in removing mass from the soliton. With astrophysically relevant parameters, this code can serve as a valuable tool to understanding whether galactic-centre solitons are expected to have an observable contribution to the mass around supermassive black holes. The code can also be used to model dynamics of axion stars forming from heavier ULDM particles, and mass loss of solitons through e.g. axion-radiation conversion.
Book Synopsis Dynamics of Black Holes and Dark Matter in Galactic Nuclei by : Ryan Martin O'Leary
Download or read book Dynamics of Black Holes and Dark Matter in Galactic Nuclei written by Ryan Martin O'Leary and published by . This book was released on 2010 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis DARK MATTER AND DARK ENERGY, BLACK HOLES, … by : John Dark-Physics
Download or read book DARK MATTER AND DARK ENERGY, BLACK HOLES, … written by John Dark-Physics and published by John Dark-Physics. This book was released on 2023-08-07 with total page 317 pages. Available in PDF, EPUB and Kindle. Book excerpt: Through a short story I will provide answers to some questions that many of us are asking about our Universe. And in particular, I will explain where would be the missing mass of the Universe (the Dark Matter) and what would be the Dark Energy and the Dark Matter. I will also discuss what happens inside a black-hole when a planet is sucked in: I have broken down the global movement into two separate movements... I have analyzed the consequences of my analysis on black-holes for our Universe and the conclusions are very interesting! My analysis allowed me to address the following points: the Energy Density of the Vacuum of the space, the Cosmological Constant, the Hubble Constant, the expansion of our Universe and the acceleration of this expansion, the compatibility links between my Theory and the current physics, … I have also shown the extraordinary power of the Gravity! And I have also shown that far-away travels into the space would be possible, in agreement with my Theory, by reducing the number of obstacles! Finally, I have mentioned the new questions that arise when some answers are found... and in particular what technology to make a spacecraft that could go at a speed close to the speed of light?
Book Synopsis The Contracting Universe Explained by : Roger Green
Download or read book The Contracting Universe Explained written by Roger Green and published by . This book was released on 2016-09-19 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is a science paper that holds the view that the universe is constantly under the influence of a massive, central black hole pulling all galaxies and other star matter towards itself in a similar manner to the known smaller black holes. This paper disagrees with the generally accepted idea of the universe starting from a singularity and expanding from there; said to be driven by what is described as dark matter and dark energy.The true dynamics of the contracting universe will never be understood until the science community is prepared to consider an alternative to the flawed Big Bang model.Dark Matter and Dark Energy are figments of mathematical equations.The Earth is not flat, nor is it part of an expanding universe.
Book Synopsis Dark Matter in the Universe by : John N. Bahcall
Download or read book Dark Matter in the Universe written by John N. Bahcall and published by World Scientific. This book was released on 2004 with total page 246 pages. Available in PDF, EPUB and Kindle. Book excerpt: If standard gravitational theory is correct, then most of the matterin the universe is in an unidentified form which does not emit enoughlight to have been detected by current instrumentation. This book isthe second editon of the lectures given at the 4th Jerusalem WinterSchool for Theoretical Physics, with new material added. The lecturesare devoted to the missing matter problem in the universe, thesearch to understand dark matter. The goal of this volume is to makecurrent research work on unseen matter accessible to students withoutprior experience in this area and to provide insights for experts inrelated research fields. Due to the pedagogical nature of the originallectures and the intense discussions between the lecturers and thestudents, the written lectures included in this volume often containtechniques and explanations not found in more formal journalpublications.
Book Synopsis Matter, Dark Matter, and Anti-Matter by : Alain Mazure
Download or read book Matter, Dark Matter, and Anti-Matter written by Alain Mazure and published by Springer Science & Business Media. This book was released on 2011-11-16 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt: For over ten years, the dark side of the universe has been headline news. Detailed studies of the rotation of spiral galaxies, and 'mirages' created by clusters of galaxies bending the light from very remote objects, have convinced astronomers of the presence of large quantities of dark (unseen) matter in the cosmos. The most striking fact is that they seem to compromise about 95% of the matter/energy content of the universe. As for ordinary matter, although we are immersed in a sea of dark particles, including primordial neutrinos and photons from fossil cosmological radiation, both we and our environment are made of ordinary, 'baryonic' matter. Authors Mazure and Le Brun present the inventory of matter, baryonic and exotic, and investigating the nature and fate of matter's twin, anti-matter. They show how technological progress has been a result of basic research, in tandem with the evolution of new ideas, and how the combined effect of these advances might help lift the cosmic veil.
Book Synopsis Nonlocal Astrophysics by : Boris V. Alexeev
Download or read book Nonlocal Astrophysics written by Boris V. Alexeev and published by Elsevier. This book was released on 2017-07-17 with total page 480 pages. Available in PDF, EPUB and Kindle. Book excerpt: Non-Local Astrophysics: Dark Matter, Dark Energy and Physical Vacuum highlights the most significant features of non-local theory, a highly effective tool for solving many physical problems in areas where classical local theory runs into difficulties. The book provides the fundamental science behind new non-local astrophysics, discussing non-local kinetic and generalized hydrodynamic equations, non-local parameters in several physical systems, dark matter, dark energy, black holes and gravitational waves. Devoted to the solution of astrophysical problems from the position of non-local physics Provides a solution for dark matter and dark energy Discusses cosmological aspects of the theory of non-local physics Includes a solution for the problem of the Hubble Universe expansion, and of the dependence of the orbital velocity from the center of gravity
Book Synopsis The Cosmic Cocktail by : Katherine Freese
Download or read book The Cosmic Cocktail written by Katherine Freese and published by Princeton University Press. This book was released on 2014-05-04 with total page 265 pages. Available in PDF, EPUB and Kindle. Book excerpt: The inside story of the epic quest to solve the mystery of dark matter The ordinary atoms that make up the known universe—from our bodies and the air we breathe to the planets and stars—constitute only 5 percent of all matter and energy in the cosmos. The rest is known as dark matter and dark energy, because their precise identities are unknown. The Cosmic Cocktail is the inside story of the epic quest to solve one of the most compelling enigmas of modern science—what is the universe made of?—told by one of today's foremost pioneers in the study of dark matter. Blending cutting-edge science with her own behind-the-scenes insights as a leading researcher in the field, acclaimed theoretical physicist Katherine Freese recounts the hunt for dark matter, from the discoveries of visionary scientists like Fritz Zwicky—the Swiss astronomer who coined the term "dark matter" in 1933—to the deluge of data today from underground laboratories, satellites in space, and the Large Hadron Collider. Theorists contend that dark matter consists of fundamental particles known as WIMPs, or weakly interacting massive particles. Billions of them pass through our bodies every second without us even realizing it, yet their gravitational pull is capable of whirling stars and gas at breakneck speeds around the centers of galaxies, and bending light from distant bright objects. Freese describes the larger-than-life characters and clashing personalities behind the race to identify these elusive particles. Many cosmologists believe we are on the verge of solving the mystery. The Cosmic Cocktail provides the foundation needed to fully fathom this epochal moment in humankind’s quest to understand the universe.
Author :Thomas V. Moore Publisher :Createspace Independent Publishing Platform ISBN 13 :9781512156522 Total Pages :0 pages Book Rating :4.1/5 (565 download)
Book Synopsis Black Marbles and Bright Energy by : Thomas V. Moore
Download or read book Black Marbles and Bright Energy written by Thomas V. Moore and published by Createspace Independent Publishing Platform. This book was released on 2015-06-05 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: BLACK MARBLES and BRIGHT ENERGY* *Dark Matter and Dark Energy Explained The science of cosmology - why our universe is what it is - abounds with unanswered questions. -What is Dark Matter? -What is Dark Energy? -What is the structure of a Black Hole? -Why is the rate of expansion of the universe increasing? This book provides answers to these questions and many others by proposing an original approach called Black Marble Theory. It is a simple, elegant, and non-mathematical idea that can be easily understood by a non-technical reader. The fundamental proposition is simply that matter can exist in a different state than the ordinary matter that we can see in the universe. It is called "Black Matter." It is produced when all of the space is compressed out of Ordinary Matter by extreme gravity. If there is enough Ordinary Matter to start with, the Black Matter will form a solid sphere called a "Black Marble." Black Marbles form the center of Black Holes. From this basic idea, the theory follows logical steps that provide clear and plausible explanations of the most profound mysteries that confront Physics today. It explains the structure of the Black Hole, the formation of galaxies, and the Big Bang itself! The theory also provides a surprisingly simple explanation of the source and fuel of the Dark Energy that propels the expansion of the universe. In an hour of easy reading, it will become clear... Why our universe is just what it appears to be.
Book Synopsis Dynamics of Stars, Dark Matter and the Universe by : Johan Georg Mulvad Samsing
Download or read book Dynamics of Stars, Dark Matter and the Universe written by Johan Georg Mulvad Samsing and published by . This book was released on 2014 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Invisible Universe: Dark Matter and Dark Energy by : Eleftherios Papantonopoulos
Download or read book The Invisible Universe: Dark Matter and Dark Energy written by Eleftherios Papantonopoulos and published by Springer. This book was released on 2007-08-01 with total page 443 pages. Available in PDF, EPUB and Kindle. Book excerpt: The nature and essence of Dark Matter and Dark Energy have become the central issue in modern cosmology over the past years. This extensive volume, an outgrowth of a topical and tutorial summer school, has been set up with the aim of constituting an advanced-level, multi-authored textbook which meets the needs of both postgraduate students and young researchers in the fields of modern cosmology and astrophysics.
Book Synopsis Finite Theory of the Universe, Dark Matter Disproof and Faster-Than-Light Speed by : Phil Bouchard
Download or read book Finite Theory of the Universe, Dark Matter Disproof and Faster-Than-Light Speed written by Phil Bouchard and published by AuthorHouse. This book was released on 2012-01-25 with total page 75 pages. Available in PDF, EPUB and Kindle. Book excerpt: The mathematical representation of General Relativity uses a four dimensional reference frame to position an object in time and space and tells us time is a linear variable that can have both a negative and positive value. This therefore implies time becomes itself a dimension and causes the theory to open doors to ideas such as: singularity, wormhole, paradoxes, etc. You will learn from this book a new mathematical model that is being suggested which is based on classical mechanics. The theory is objective and predicts low scale GPS gravitational time dilation, perihelion precession disparity, gravitational light bending, artificial faster-than-light motion, up to the rotation curve for all galaxies, natural faster-than-light galactic expansion and even the constitution of a black hole. You will enjoy how this book shows Einstein to be wrong and how faster-than-light travel is not science-fiction.
Book Synopsis Bose-Einstein Condensation by : Lev. P. Pitaevskii
Download or read book Bose-Einstein Condensation written by Lev. P. Pitaevskii and published by Oxford University Press. This book was released on 2003-04-03 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bose-Einstein Condensation represents a new state of matter and is one of the cornerstones of quantum physics, resulting in the 2001 Nobel Prize. Providing a useful introduction to one of the most exciting field of physics today, this text will be of interest to a growing community of physicists, and is easily accessible to non-specialists alike.
Book Synopsis From Supermassive Black Holes to Supersymmetric Dark Matter by : Savvas Michael Koushiappas
Download or read book From Supermassive Black Holes to Supersymmetric Dark Matter written by Savvas Michael Koushiappas and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: It is without doubt that in recent years cosmology has entered an era where cosmological parameters are now measured precisely enough to derive conclusions about the underlying characteristics of the Universe. I present an overview of the methods used to estimate the parameters that lead to the standard cosmological model. After a brief detour on the current understanding of the mechanisms that lead to galaxy formation, I present a model in which the seeds of supermassive black holes observed in galactic spheroids form out of the lowest angular momentum gas in proto-galaxies at high redshift. I assume that the gas in early-forming, rare-peak halos has a distribution of specific angular momentum similar to that derived for the dark matter. In halos more massive than a critical threshold, proto-galactic disks are gravitationally unstable and experience an efficient viscosity that transfers angular momentum outward allowing mass inflow. This process continues until the first massive stars disrupt the disk. The seed black holes created in this manner have a characteristic mass scale, roughly independent of the redshift of formation. By the redshift of reionization, the comoving mass density is comparable to that inferred from observations, with room for appropriate additional luminous growth during a later quasar accretion phase. The hierarchical merger process naturally leads to a linear correlation between black-hole mass and stellar spheroid mass. Quite orthogonal to this study, I estimate the probability of detecting gamma-rays from the annihilation of neutralino dark matter in the Milky Way substructure. I characterize substructure statistically based on Monte Carlo realizations of the formation of a Milky Way-like halo. I find that it may be possible for upcoming experiments to detect gamma-rays from dark matter substructure if the neutralino is relatively light, while for a heavy neutralino such a detection would be unlikely. I find that the probability of detection is sensitive to poorly-constrained input parameters, particularly those that characterize the primordial power spectrum. I conclude that the lack of a detected gamma-ray signal gives very little information about the supersymmetric parameter space due to uncertainties associated with both the properties of substructure and cosmological parameters.
Download or read book Superradiance written by Richard Brito and published by Springer Nature. This book was released on 2020-08-21 with total page 293 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book focuses on one mechanism in black hole physics which has proven to be universal, multifaceted and with a rich phenomenology: rotational superradiance. This is an energy extraction process, whereby black holes can deposit their rotational energy in their surroundings, leading to Penrose processes, black-hole bombs, and even Hawking radiation. Black holes are key players in star formation mechanisms and as engines to some of the most violent events in our universe. Their simplicity and compactness make them perfect laboratories, ideally suited to probe new fields or modifications to the theory of gravity. Thus, black holes can also be used to probe some of the most important open problems in physics, including the nature of dark matter or the strong CP problem in particle physics. This monograph is directed to researchers and graduate students and provides a unified view of the subject, covering the theoretical machinery, experimental efforts in the laboratory, and astrophysics searches. It is focused on recent developments and works out a number of novel examples and applications, ranging from fundamental physics to astrophysics. Non-specialists with a scientific background should also find this text a valuable resource for understanding the critical issues of contemporary research in black-hole physics. This second edition stresses the role of ergoregions in superradiance, and completes its catalogue of energy-extraction processes. It presents a unified description of instabilities of spinning black holes in the presence of massive fields. Finally, it covers the first experimental observation of superradiance, and reviews the state-of-the-art in the searches for new light fields in the universe using superradiance as a mechanism.
Book Synopsis Seismic Waves and Sources by : A. Ben-Menahem
Download or read book Seismic Waves and Sources written by A. Ben-Menahem and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 1127 pages. Available in PDF, EPUB and Kindle. Book excerpt: Earthquakes come and go as they please, leaving behind them trails of destruc tion and casualties. Although their occurrence is little affected by what we do or think, it is the task of earth scientists to keep studying them from all possible angles until ways and means are found to divert, forecast, and eventually control them. In ancient times people were awestruck by singular geophysical events, which were attributed to supernatural powers. It was recognized only in 1760 that earthquakes originated within the earth. A hundred years later, first systematic attempts were made to apply physical principles to study them. During the next century scientists accumulated knowledge about the effects of earthquakes, their geographic patterns, the waves emitted by them, and the internal constitution of the earth. During the past 20 years, seismology has made a tremendous progress, mainly because of the advent of modern computers and improvements in data acquisi tion systems, which are now capable of digital and analog recording of ground motion over a frequency range of five orders of magnitude. These technologic developments have enabled seismologists to make measurements with far greater precision and sophistication than was previously possible. Advanced computational analyses have been applied to high-quality data and elaborate theoretical models have been devised to interpret them. As a result, far reaching advances in our knowledge of the earth's structure and the nature of earthquake sources have occurred.
Book Synopsis Dark Matter and Dark Energy by : Sabino Matarrese
Download or read book Dark Matter and Dark Energy written by Sabino Matarrese and published by Springer Science & Business Media. This book was released on 2011-02-10 with total page 413 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book brings together reviews from leading international authorities on the developments in the study of dark matter and dark energy, as seen from both their cosmological and particle physics side. Studying the physical and astrophysical properties of the dark components of our Universe is a crucial step towards the ultimate goal of unveiling their nature. The work developed from a doctoral school sponsored by the Italian Society of General Relativity and Gravitation. The book starts with a concise introduction to the standard cosmological model, as well as with a presentation of the theory of linear perturbations around a homogeneous and isotropic background. It covers the particle physics and cosmological aspects of dark matter and (dynamical) dark energy, including a discussion of how modified theories of gravity could provide a possible candidate for dark energy. A detailed presentation is also given of the possible ways of testing the theory in terms of cosmic microwave background, galaxy redshift surveys and weak gravitational lensing observations. Included is a chapter reviewing extensively the direct and indirect methods of detection of the hypothetical dark matter particles. Also included is a self-contained introduction to the techniques and most important results of numerical (e.g. N-body) simulations in cosmology. " This volume will be useful to researchers, PhD and graduate students in Astrophysics, Cosmology Physics and Mathematics, who are interested in cosmology, dark matter and dark energy.
