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Gravitational Microlensing Due To Dark Matter Subhalos
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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 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 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 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 A Ray of Light in a Sea of Dark Matter by : Charles Keeton
Download or read book A Ray of Light in a Sea of Dark Matter written by Charles Keeton and published by Rutgers University Press. This book was released on 2014-04-30 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt: What’s in the dark? Countless generations have gazed up at the night sky and asked this question—the same question that cosmologists ask themselves as they study the universe. The answer turns out to be surprising and rich. The space between stars is filled with an exotic substance called “dark matter” that exerts gravity but does not emit, absorb, or reflect light. The space between galaxies is rife with “dark energy” that creates a sort of cosmic antigravity causing the expansion of the universe to accelerate. Together, dark matter and dark energy account for 95 percent of the content of the universe. News reporters and science journalists routinely talk about these findings using terms that they assume we have a working knowledge of, but do you really understand how astronomers arrive at their findings or what it all means? Cosmologists face a conundrum: how can we study substances we cannot see, let alone manipulate? A powerful approach is to observe objects whose motion is influenced by gravity. Einstein predicted that gravity can act like a lens to bend light. Today we see hundreds of cases of this—instances where the gravity of a distant galaxy distorts our view of a more distant object, creating multiple images or spectacular arcs on the sky. Gravitational lensing is now a key part of the international quest to understand the invisible substance that surrounds us, penetrates us, and binds the universe together. A Ray of Light in a Sea of Dark Matter offers readers a concise, accessible explanation of how astronomers probe dark matter. Readers quickly gain an understanding of what might be out there, how scientists arrive at their findings, and why this research is important to us. Engaging and insightful, Charles Keeton gives everyone an opportunity to be an active learner and listener in our ever-expanding universe. Watch a video with Charles Keeton: Watch video now. (http://www.youtube.com/watch?v=Uc3byXNS1G0).
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 Dark Matter Detection with Gravitational Microlensing by : Mark Robin Pratt
Download or read book Dark Matter Detection with Gravitational Microlensing written by Mark Robin Pratt and published by . This book was released on 1997 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Gravitational Microlensing and Dark Matter in the Galactic Halo by : Philippe Jetzer
Download or read book Gravitational Microlensing and Dark Matter in the Galactic Halo written by Philippe Jetzer and published by . This book was released on 1998 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Gravitational Microlensing Toward the Andromeda Galaxy by : Arno Riffeser
Download or read book Gravitational Microlensing Toward the Andromeda Galaxy written by Arno Riffeser and published by . This book was released on 2006 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Illuminating Dark Matter by : Rouven Essig
Download or read book Illuminating Dark Matter written by Rouven Essig and published by Springer Nature. This book was released on 2019-11-22 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt: Based on a Simons Symposium held in 2018, the proceedings in this volume focus on the theoretical, numerical, and observational quest for dark matter in the universe. Present ground-based and satellite searches have so far severely constrained the long-proposed theoretical models for dark matter. Nevertheless, there is continuously growing astrophysical and cosmological evidence for its existence. To address present and future developments in the field, novel ideas, theories, and approaches are called for. The symposium gathered together a new generation of experts pursuing innovative, more complex theories of dark matter than previously considered.This is being done hand in hand with experts in numerical astrophysical simulations and observational techniques—all paramount for deciphering the nature of dark matter. The proceedings volume provides coverage of the most advanced stage of understanding dark matter in various new frameworks. The collection will be useful for graduate students, postdocs, and investigators interested in cutting-edge research on one of the biggest mysteries of our universe.
Book Synopsis Gravitational Lensing and Microlensing by : Wallace Larsen
Download or read book Gravitational Lensing and Microlensing written by Wallace Larsen and published by . This book was released on 2017-07-05 with total page 196 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 Gravitational Microlensing Searches and Results by :
Download or read book Gravitational Microlensing Searches and Results written by and published by . This book was released on 1997 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: Baryonic matter, in the form of Machos (MAssive Compact Halo Objects), might be a significant constituent of the dark matter that dominates the Milky Way. This article describes how surveys for Machos exploit the gravitational microlens magnification of extragalactic stars. The experimental searches for this effect monitor millions of stars, in some cases every night, looking for magnification events. The early results of these surveys indicate that Machos make up a significant fraction of the dark matter in the Milky Way, and that these objects have stellar masses. Truly substellar objects do not contribute much to the total. Additionally, the relatively high event rate towards the Galactic bulge seems to require that the bulge be elongated, and massive.
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: This book presents the basics of gravitational lensing, accessible to students and researchers with a wide range of backgrounds.
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.
Author :Gordon Keith Squires Publisher :National Library of Canada = Bibliothèque nationale du Canada ISBN 13 :9780612119536 Total Pages :334 pages Book Rating :4.1/5 (195 download)
Book Synopsis Mapping the Dark Matter with Weak Gravitational Lensing [microform] by : Gordon Keith Squires
Download or read book Mapping the Dark Matter with Weak Gravitational Lensing [microform] written by Gordon Keith Squires and published by National Library of Canada = Bibliothèque nationale du Canada. This book was released on 1995 with total page 334 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Revealing the Small Scale Structure of Dark Matter with Gravitational Lensing by : Warren Richard Morningstar
Download or read book Revealing the Small Scale Structure of Dark Matter with Gravitational Lensing written by Warren Richard Morningstar and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The standard model for dark matter, the Cold Dark Matter model, which accurately predicts the formation and evolution of large scale structure in the universe, appears to be in disagreement with observations of structure on much smaller scales. It is, as of yet, unclear if this is due to astrophysical processes causing a reduction in the efficiency of star formation in low mass galaxies, or due to the suppression of low mass structure formation altogether caused by exciting new dark matter microphysics. Gravitational lensing offers a unique and luminosity-independent means of distinguishing between these possibilities. In this work, I present tools to simulate realistic ALMA observations of strong gravitational lenses, and to model the small scale distribution of dark matter using interferometric observations of strong lenses. We applied this technique to observations of the gravitational lens SDP 81, and identified a low mass perturbing object, and placed new constraints on the abundance of low mass dark matter halos. I also present several techniques to automate the inference of the smooth distribution of matter in these objects, which allow inference to proceed 1.6 billion times faster, and which strongly reduce the need for human supervision of the modeling process. With these techniques in hand, we are poised to extract important information about the elusive dark matter.
Book Synopsis Gravitational Lensing as a Probe of Dark Matter, the Distance Scale, and Gravitational Waves in the Universe by : Rennan Bar-Kana
Download or read book Gravitational Lensing as a Probe of Dark Matter, the Distance Scale, and Gravitational Waves in the Universe written by Rennan Bar-Kana and published by . This book was released on 1997 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt: