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Topics In Microlensing And Dark Energy
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Book Synopsis Topics in Microlensing and Dark Energy by : Mark Yashar
Download or read book Topics in Microlensing and Dark Energy written by Mark Yashar and published by . This book was released on 2009 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Probing Cosmic Dark Matter and Dark Energy with Weak Gravitational Lensing Statistics by : Masato Shirasaki
Download or read book Probing Cosmic Dark Matter and Dark Energy with Weak Gravitational Lensing Statistics written by Masato Shirasaki and published by Springer. This book was released on 2015-11-18 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this book the applicability and the utility of two statistical approaches for understanding dark energy and dark matter with gravitational lensing measurement are introduced. For cosmological constraints on the nature of dark energy, morphological statistics called Minkowski functionals (MFs) to extract the non-Gaussian information of gravitational lensing are studied. Measuring lensing MFs from the Canada–France–Hawaii Telescope Lensing survey (CFHTLenS), the author clearly shows that MFs can be powerful statistics beyond the conventional approach with the two-point correlation function. Combined with the two-point correlation function, MFs can constrain the equation of state of dark energy with a precision level of approximately 3–4 % in upcoming surveys with sky coverage of 20,000 square degrees. On the topic of dark matter, the author studied the cross-correlation of gravitational lensing and the extragalactic gamma-ray background (EGB). Dark matter annihilation is among the potential contributors to the EGB. The cross-correlation is a powerful probe of signatures of dark matter annihilation, because both cosmic shear and gamma-ray emission originate directly from the same dark matter distribution in the universe. The first measurement of the cross-correlation using a real data set obtained from CFHTLenS and the Fermi Large Area Telescope was performed. Comparing the result with theoretical predictions, an independent constraint was placed on dark matter annihilation. Future lensing surveys will be useful to constrain on the canonical value of annihilation cross section for a wide range of mass of dark matter annihilation. Future lensing surveys will be useful to constrain on the canonical value of annihilation cross section for a wide range of mass of dark matter.
Book Synopsis Gravitational Lensing And Microlensing by : Silvia Mollerach
Download or read book Gravitational Lensing And Microlensing written by Silvia Mollerach and published by World Scientific. This book was released on 2002-01-15 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a comprehensive and self-contained exposition of gravitational lensing phenomena. It presents the up-to-date status of gravitational lensing and microlensing, covering the cosmological applications of the observed lensing by galaxies, clusters and the large scale structures, as well as the microlensing searches in the Local Group and its applications to unveil the nature of the galactic dark matter, the search for planetary objects and the distribution of faint stars in our galaxy.Gravitational Lensing and Microlensing is pitched at the level of the graduate student interested in the issues of astrophysics and cosmology, and should be useful for specialist researchers as well.
Book Synopsis Connecting Quarks with the Cosmos by : National Research Council
Download or read book Connecting Quarks with the Cosmos written by National Research Council and published by National Academies Press. This book was released on 2003-03-12 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advances made by physicists in understanding matter, space, and time and by astronomers in understanding the universe as a whole have closely intertwined the question being asked about the universe at its two extremesâ€"the very large and the very small. This report identifies 11 key questions that have a good chance to be answered in the next decade. It urges that a new research strategy be created that brings to bear the techniques of both astronomy and sub-atomic physics in a cross-disciplinary way to address these questions. The report presents seven recommendations to facilitate the necessary research and development coordination. These recommendations identify key priorities for future scientific projects critical for realizing these scientific opportunities.
Book Synopsis Principles of Gravitational Lensing by : Arthur B. Congdon
Download or read book Principles of Gravitational Lensing written by Arthur B. Congdon and published by Springer. This book was released on 2018-12-01 with total page 287 pages. Available in PDF, EPUB and Kindle. Book excerpt: This textbook provides an introduction to gravitational lensing, which has become an invaluable tool in modern astrophysics, with applications that range from finding planets orbiting distant stars to understanding how dark matter and dark energy conspired to form the cosmic structures we see today. Principles of Gravitational Lensing begins with Einstein’s prediction that gravity bends light, and shows how that fundamental idea has spawned a rich field of study over the past century. The gravitational deflection of light was first detected by Eddington during a solar eclipse in May 1919, launching Einstein and his theory of relativity into public view. Yet the possibility of using the phenomenon to unlock mysteries of the Universe seemed remote, given the technology of the day. Theoretical work was carried out sporadically over the next six decades, but only with the discovery of the system Q0957+561 in 1979 was gravitational lensing transformed from a curiosity of general relativity into a practical observational tool. This book describes how the three subfields known as strong lensing, weak lensing, and microlensing have grown independently but become increasingly intertwined. Drawing on their research experience, Congdon and Keeton begin with the basic physics of light bending, then present the mathematical foundations of gravitational lensing, building up to current research topics in a clear and systematic way. Relevant background material from physics and mathematics is included, making the book self-contained. The derivations and explanations are supplemented by exercises designed to help students master the theoretical concepts as well as the methods that drive current research. An extensive bibliography guides those wishing to delve more deeply into particular areas of interest. Principles of Gravitational Lensing is ideal for advanced students and seasoned researchers looking to penetrate this thriving subject and even contribute research of their own.
Book Synopsis Introduction to Gravitational Lensing by : Massimo Meneghetti
Download or read book Introduction to Gravitational Lensing written by Massimo Meneghetti and published by Springer Nature. This book was released on 2021-12-10 with total page 412 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book introduces the phenomenology of gravitational lensing in an accessible manner and provides a thorough discussion of the related astrophysical applications. It is intended for advanced undergraduates and graduate students who want to start working in this rapidly evolving field. This includes also senior researchers who are interested in ongoing or future surveys and missions such as DES, Euclid, WFIRST, LSST. The reader is guided through many fascinating topics related to gravitational lensing like the structure of our galaxy, the searching for exoplanets, the investigation of dark matter in galaxies and galaxy clusters, and several aspects of cosmology, including dark energy and the cosmic microwave background. The author, who has gained valuable experience as academic teacher, guides the readers towards the comprehension of the theory of gravitational lensing and related observational techniques by using simple codes written in python. This approach, beyond facilitating the understanding of gravitational lensing, is preparatory for learning the python programming language which is gaining large popularity both in academia and in the private sector.
Book Synopsis Gravitational Microlensing Due to Dark Matter Subhalos by : Elena de la Hoz López-Collado
Download or read book Gravitational Microlensing Due to Dark Matter Subhalos written by Elena de la Hoz López-Collado and published by . This book was released on 2017 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Our Galaxy, the Milky way, is surrounded by a dark matter spherical halo. This halo is not homogeneous, indeed it has substructure. Bound dark matter substructure, "subhalos", are dark matter dynamic clumps with a roughly spherical shape. A promising indirect way to detect dark matter subhalos in our Galaxy is the phenomenon of microlensing. When a distant star's light path goes through the proximity of a heavy astronomical object, the path "bends" and the star appears to be in a different position. As the substructure is constantly moving, the distant star's image will move as well, which in fact is a signature of astronomic microlensing by dark matter subhalos. This thesis studies how gravitational microlensing can contribute to search of dark matter. The first chapter depicts the current picture of dark matter. Some of the most compelling pieces of evidence for the existence of dark matter are explained. We present the characteristics of dark matter candidates and focus on a specific candidate, the Weakly Interacting Massive Particle. We also describe the dark matter distribution and substructure in the Milky Way. Finally, we outline two current approaches to detect dark matter. In the second chapter, we derive an equation for the deflection angle that a galactic subhalo induces in the light path of a distant source. This equation is used to make predictions for the microlensing signature of possible dark matter subhalos. The third chapter is devoted to the analysis of the relationships between the deflection angle and the parameters involved in a microlensing event. As an input we use the subhalos created in the N-body simulation \texttt{Via Lactea}. From the analysis we deduce under which conditions microlensing events are more likely to be observed. Chapter 4 introduces the topic of dark matter detection from its particles' annihilation. Dark matter subhalos can be detected from the standard model products of the annihilations, e.g., photons. Gravitational microlensing can be used to crosscheck whether the subhalo candidates found are indeed dark matter. This chapter reviews the theory of dark matter annihilation into photons. Also, we reconstructed a whole sky map with dark matter contribution to the electromagnetic background radiation. In chapter 5 we make predictions for the microlensing signatures that actual subhalo candidates can induce. Subhalo candidates are found using two techniques, the Non-Poissonian Template Fitting and looking for spatially extended sources with emission only in the gamma-rays. For both techniques we explain the underlying physics behind the respective approach, describe the process of subhalo candidates selection, relate the subhalos' information obtained from those techniques with the subhalo properties needed to calculate the deflection angle and finally, make predictions for possible microlensing events induced by the subhalo candidates under consideration. The last chapter summarizes the important points of this thesis and proposes a detection strategy to observe microlensing events. We also describe the Gaia mission as it has the instruments needed to measure these microlensing signatures."
Book Synopsis Modern Cosmology by : Scott Dodelson
Download or read book Modern Cosmology written by Scott Dodelson and published by Academic Press. This book was released on 2003-03-13 with total page 462 pages. Available in PDF, EPUB and Kindle. Book excerpt: An advanced text for senior undergraduates, graduate students and physical scientists in fields outside cosmology. This is a self-contained book focusing on the linear theory of the evolution of density perturbations in the universe, and the anisotropiesin the cosmic microwave background.
Book Synopsis Sources and Detection of Dark Matter and Dark Energy in the Universe by : David B. Cline
Download or read book Sources and Detection of Dark Matter and Dark Energy in the Universe written by David B. Cline and published by Springer Science & Business Media. This book was released on 2013-03-09 with total page 551 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dark matter research is one of the most fascinating and active fields among current high-profile scientific endeavours. It holds the key to all major breakthroughs to come in the fields of cosmology and astroparticle physics. The present volume is particularly concerned with the sources and the detection of dark matter and dark energy in the universe and will prove to be an invaluable research tool for all scientists who work in this field.
Book Synopsis Singularity Theory and Gravitational Lensing by : Arlie O. Petters
Download or read book Singularity Theory and Gravitational Lensing written by Arlie O. Petters and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 616 pages. Available in PDF, EPUB and Kindle. Book excerpt: This monograph is the first to develop a mathematical theory of gravitational lensing. The theory applies to any finite number of deflector planes and highlights the distinctions between single and multiple plane lensing. Introductory material in Parts I and II present historical highlights and the astrophysical aspects of the subject. Part III employs the ideas and results of singularity theory to put gravitational lensing on a rigorous mathematical foundation.
Book Synopsis The Light/dark Universe by : James Martin Overduin
Download or read book The Light/dark Universe written by James Martin Overduin and published by World Scientific. This book was released on 2008 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt: To the eyes of the average person and the trained scientist, the night sky is dark, even though the universe is populated by myriads of bright galaxies. Why this happens is a question commonly called Olbers' Paradox, and dates from at least 1823. How dark is the night sky is a question which preoccupies astrophysicists at the present. The answer to both questions tells us about the origin of the universe and the nature of its contents ? luminous galaxies like the Milky Way, plus the dark matter between them and the mysterious dark energy which appears to be pushing everything apart. In this book, the fascinating history of Olbers' Paradox is reviewed, and the intricate physics of the light/dark universe is examined in detail. The fact that the night sky is dark (a basic astronomical observation that anybody can make) turns out to be connected with the finite age of the universe, thereby confirming some event like the Big Bang. But the space between the galaxies is not perfectly black, and data on its murkiness at various wavelengths can be used to constrain and identify its unseen constituents.
Book Synopsis Research on Galactic Dark Matter Implied by Gravitational Microlensing by : Nathalie Palanque-Delabrouille
Download or read book Research on Galactic Dark Matter Implied by Gravitational Microlensing written by Nathalie Palanque-Delabrouille and published by . This book was released on 1997 with total page 552 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis In Search of Dark Matter by : Ken Freeman
Download or read book In Search of Dark Matter written by Ken Freeman and published by Springer Science & Business Media. This book was released on 2006-08-25 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt: Written for the educated non-scientist and scientist alike, it spans a variety of scientific disciplines, from observational astronomy to particle physics. Concepts that the reader will encounter along the way are at the cutting edge of scientific research. However the themes are explained in such a way that no prior understanding of science beyond a high school education is necessary.
Book Synopsis Gravitational Lensing by : Scott Dodelson
Download or read book Gravitational Lensing written by Scott Dodelson and published by Cambridge University Press. This book was released on 2017-06-08 with total page 245 pages. Available in PDF, EPUB and Kindle. Book excerpt: Gravitational lensing is a consequence of general relativity, where the gravitational force due to a massive object bends the paths of light originating from distant objects lying behind it. Using very little general relativity and no higher level mathematics, this text presents the basics of gravitational lensing, focusing on the equations needed to understand the phenomena. It then applies them to a diverse set of topics, including multiply imaged objects, time delays, extrasolar planets, microlensing, cluster masses, galaxy shape measurements, cosmic shear, and lensing of the cosmic microwave background. This approach allows undergraduate students and others to get quickly up to speed on the basics and the important issues. The text will be especially relevant as large surveys such as LSST and Euclid begin to dominate the astronomical landscape. Designed for a one semester course, it is accessible to anyone with two years of undergraduate physics background.
Book Synopsis Dark Matter In Astroparticle And Particle Physics - Proceedings Of The 6th International Heidelberg Conference by : Hans Volker Klapdor-kleingrothaus
Download or read book Dark Matter In Astroparticle And Particle Physics - Proceedings Of The 6th International Heidelberg Conference written by Hans Volker Klapdor-kleingrothaus and published by World Scientific. This book was released on 2008-05-09 with total page 654 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dark matter remains one of the central mysteries in modern physics, although modern astronomical observations and particle physics experiments are providing vital clues in uncovering its true nature. The Dark2007 Conference brought together world-leading researchers in both astrophysics and particle physics, providing them with an opportunity to present their latest results and engage in discussion on their meaning and future direction. This book is important in its field, as it provides a vital snapshot of the seemingly disparate areas of dark matter research and provides an overview of current ideas and future directions.
Book Synopsis Revealing the Nature of Galactic Dark Matter Using Gravitational Microlensing by : Cheongho Han
Download or read book Revealing the Nature of Galactic Dark Matter Using Gravitational Microlensing written by Cheongho Han and published by . This book was released on 1997 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Dark Energy Explained by : Gina Hagler
Download or read book Dark Energy Explained written by Gina Hagler and published by Enslow Publishing, LLC. This book was released on 2018-12-15 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dark energy is a mysterious force causing the universe to expand in an accelerating manner. Although Edwin Hubble discovered observational proof of expansion in 1929, the first direct evidence for dark energy came from supernova observations in the late 1990s. Untangling complex physics theories with accessible language, informative sidebars, and captivating imagery, this text explores the development and evaluation of scientific theories behind dark energy. Students will learn about the tools and methods scientists use to unravel dark energy's origins, dynamics, and effects on the universe.