Alternative Probes In Cosmology

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Alternative Probes in Cosmology

Author : Irène Balmès
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (892 download)

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Book Synopsis Alternative Probes in Cosmology by : Irène Balmès

Download or read book Alternative Probes in Cosmology written by Irène Balmès and published by . This book was released on 2013 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The goal of this thesis was to study cosmological probes. We focused on time-delays in lenses and density profiles of halos. For the former, we use Bayesian methods to test strong lens models and select a subsample suitable for cosmological parameter inference. To this end we apply a Bayes factor analysis to synthetic catalogs of lense. with angular structure. We focus on double lenses. Through a likelihood analysis we recover the input value of HO to within 3sigma statistical uncertainty. We apply this methodology to observed double lenses and obtain three lenses in which a simple power-law model is favored. Assuming a flat ACDM cosmology, the combined likelihood data analysis of such systems gives h = 0.76+0.15-0.05. The next generation of cosmic structure surveys will provide larger lens datasets and this method can be useful to select homogeneous lens subsamples adapted to unbiased cosmological parameter inference. In a second part we focus on the imprint of dark energy on the density profile of Dark Matter halos using cosmological N-body simulations from DEUSS. We first focus on the analysis of the chi-square of the NFW profile. The fraction of halos ill-fitted varies with cosmology, indicating that the mass assembly in unrelaxed halos carries a signature of dark energy. To access this information independently of the NFW profile, we introduce a new observable quantity: the sparsity. This is defined as the ratio of masses M200/MDelta. We find the average sparsity to be nearly independent of the total halo mass. Most importantly, we find that the sparsity varies significantly with the underlying dark energy model, thus providing an alternative cosmological test.

Cosmological Probes of Light Relics

Author : Benjamin Wallisch
Publisher : Springer Nature
ISBN 13 : 3030310981
Total Pages : 229 pages
Book Rating : 4.0/5 (33 download)

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Book Synopsis Cosmological Probes of Light Relics by : Benjamin Wallisch

Download or read book Cosmological Probes of Light Relics written by Benjamin Wallisch and published by Springer Nature. This book was released on 2019-11-20 with total page 229 pages. Available in PDF, EPUB and Kindle. Book excerpt: The wealth of recent cosmic microwave background and large-scale structure data has transformed the field of cosmology. These observations have not only become precise enough to answer questions about the universe on the largest scales, but also to address puzzles in the microscopic description of Nature. This thesis investigates new ways of probing the early universe, the properties of neutrinos and the possible existence of other light particles. In particular, based on detailed theoretical insights and novel analyses, new evidence for the cosmic neutrino background is found in the distribution of galaxies and in cosmic microwave background data. This tests the Standard Model of particle physics and the universe back to a time when it was about one second old. Furthermore, it is demonstrated that future observations will be capable of probing physics beyond the Standard Model since they can achieve a particular target which would either allow the detection of any light particles that have ever been in thermal equilibrium or imply strong bounds on their properties.

Strong Gravitational Lensing as a Probe of Galaxy Clusters, Cosmology and Alternative Gravity Theories

Author : Mario Lubini
Publisher :
ISBN 13 :
Total Pages : 136 pages
Book Rating : 4.:/5 (855 download)

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Book Synopsis Strong Gravitational Lensing as a Probe of Galaxy Clusters, Cosmology and Alternative Gravity Theories by : Mario Lubini

Download or read book Strong Gravitational Lensing as a Probe of Galaxy Clusters, Cosmology and Alternative Gravity Theories written by Mario Lubini and published by . This book was released on 2013 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Relativistic Cosmology

Author : George F. R. Ellis
Publisher : Cambridge University Press
ISBN 13 : 0521381150
Total Pages : 637 pages
Book Rating : 4.5/5 (213 download)

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Book Synopsis Relativistic Cosmology by : George F. R. Ellis

Download or read book Relativistic Cosmology written by George F. R. Ellis and published by Cambridge University Press. This book was released on 2012-03-22 with total page 637 pages. Available in PDF, EPUB and Kindle. Book excerpt: Surveying key developments and open issues in cosmology for graduate students and researchers, this book focuses on the general concepts and relations that underpin the standard model of the Universe. It also examines anisotropic and inhomogeneous models, and deeper issues, such as quantum cosmology and the multiverse proposal.

Probing the New Cosmology

Author : Andrew Zentner
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (549 download)

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Book Synopsis Probing the New Cosmology by : Andrew Zentner

Download or read book Probing the New Cosmology written by Andrew Zentner and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: Improvements in obserational techniques have transformed cosmology into a field inundated with ever-expanding, high-quality data sets and driven cosmology toward a standard model where the classic cosmological parameters are accurately measured. I briefly discuss some of the methods used to determine cosmological parameters, particularly primordial nucleosynthesis, the magnitude-redshift relation of supernovae, and cosmic microwave background anisotropy. I demonstrate how cosmological data can be used to complement particle physics and constrain extensions to the Standard Model. Specifically, I present bounds on light particle species and the properties of unstable, weakly-interacting, massive particles. Despite the myriad successes of the emerging cosmological model, unanswered questions linger. Numerical simulations of structure formation predict galactic central densities that are considerably higher than observed. They also reveal hundreds of satellites orbiting Milky Way-like galaxies while the Milky Way has only eleven known satellites within 300kpc. I explore the possibility that these conundrums may have a common remedy in the form of the power spectrum of initial density fluctuations that seed structure growth. To address the substructure issue, I develop a semi-analytic method that suffers from no inherent resolution limits and can therefore be used to complement numerical simulations. I find that tilted primordial power spectra and spectra with running tilts provide for an intriguing possibility. In these models, the amplitude of initial fluctuations can be normalized against the cosmic microwave background measurements on large scales. Yet, the reduction in small-scale power brings galactic central densities down to acceptable levels and allows for the Milky Way satellite population to be accounted for without invoking differential feedback mechanisms. Furthermore, substructure mass fractions are not significantly altered in these models so probes of substructure via gravitational lensing do not disfavor them. The primordial fluctuations are thought to be generated during an early epoch of inflation and one implication is that galaxy properties may convey information about inflation. I also address alternative proposals, such as warm dark matter and broken scale-invariant inflation, in light of lensing probes of substructure and find these models to be disfavored. I close with a few words on refining the model and alternative applications.

Probes of the Early Universe

Author : Max Tegmark
Publisher :
ISBN 13 :
Total Pages : 402 pages
Book Rating : 4.:/5 (33 download)

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Book Synopsis Probes of the Early Universe by : Max Tegmark

Download or read book Probes of the Early Universe written by Max Tegmark and published by . This book was released on 1994 with total page 402 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Compact Objects in the Universe

Author : Eleftherios Papantonopoulos
Publisher : Springer
ISBN 13 : 9783031550973
Total Pages : 0 pages
Book Rating : 4.5/5 (59 download)

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Book Synopsis Compact Objects in the Universe by : Eleftherios Papantonopoulos

Download or read book Compact Objects in the Universe written by Eleftherios Papantonopoulos and published by Springer. This book was released on 2024-08-11 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The main objective of this volume is to discuss the physical properties, observational signals and various probes of compact objects in the Universe. These include black holes, neutron stars, and exotic objects studied in alternative theories of gravity. The text is mainly addressed to postgraduate students and young researchers with the aim of introducing them to these very challenging topics.

Structure Formation in the Universe

Author : T. Padmanabhan
Publisher : Cambridge University Press
ISBN 13 : 9780521424868
Total Pages : 504 pages
Book Rating : 4.4/5 (248 download)

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Book Synopsis Structure Formation in the Universe by : T. Padmanabhan

Download or read book Structure Formation in the Universe written by T. Padmanabhan and published by Cambridge University Press. This book was released on 1993 with total page 504 pages. Available in PDF, EPUB and Kindle. Book excerpt: This text provides an up-to-date and pedagogical introduction to this exciting area of research.

Astrophysical Aspects Of The Most Energetic Cosmic Rays - Proceedings Of The Icrr International Symposium

Author : M Nagano
Publisher : World Scientific
ISBN 13 : 9814556106
Total Pages : 518 pages
Book Rating : 4.8/5 (145 download)

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Book Synopsis Astrophysical Aspects Of The Most Energetic Cosmic Rays - Proceedings Of The Icrr International Symposium by : M Nagano

Download or read book Astrophysical Aspects Of The Most Energetic Cosmic Rays - Proceedings Of The Icrr International Symposium written by M Nagano and published by World Scientific. This book was released on 1991-07-23 with total page 518 pages. Available in PDF, EPUB and Kindle. Book excerpt: The proceedings present new results obtained from recent observations by the Haverah Park, Yakutsk, Fly's Eye and Akeno groups on the shape of the energy spectrum, the arrival direction (point source) and the nature of the most energetic cosmic rays. They also contain an in-depth discussion of the present status of observations on discrete sources at TeV and PeV energies. A detailed discussion of the physics problems related to the origin, acceleration mechanism and propagation of the most energetic cosmic rays in the galactic and extragalactic space is given in relation to observable features.

From Quantum to Cosmos

Author : Slava G. Turyshev
Publisher : World Scientific
ISBN 13 : 9814261211
Total Pages : 764 pages
Book Rating : 4.8/5 (142 download)

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Book Synopsis From Quantum to Cosmos by : Slava G. Turyshev

Download or read book From Quantum to Cosmos written by Slava G. Turyshev and published by World Scientific. This book was released on 2009 with total page 764 pages. Available in PDF, EPUB and Kindle. Book excerpt: Space-based laboratory research in fundamental physics is an emerging research discipline that offers great discovery potential and at the same time could drive the development of technological advances which are likely to be important to scientists and technologists in many other different research fields. The articles in this review volume have been contributed by participants of the international workshop "From Quantum to Cosmos : Fundamental Physics Research in Space" held at the Airlie Center in Warrenton, Virginia, USA, on May 21-24, 2006. This unique volume discusses the advances in our understanding of fundamental physics that are anticipated in the near future, and evaluates the discovery potential of a number of recently proposed space-based gravitational experiments. Specific research areas covered include various tests of general relativity and alternative theories, search of physics beyond the Standard Model, investigations of possible violations of the equivalence principle, search for new hypothetical long- and short-range forces, variations of fundamental constants, tests of Lorentz invariance and attempts at unification of the fundamental interactions. The book also encompasses experiments aimed at the discovery of novel phenomena, including dark matter candidates, and studies of dark energy.

'95 Electroweak Interactions and Unified Theories

Author : J. Thanh Van Tran
Publisher : Atlantica Séguier Frontières
ISBN 13 : 9782863321850
Total Pages : 574 pages
Book Rating : 4.3/5 (218 download)

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Book Synopsis '95 Electroweak Interactions and Unified Theories by : J. Thanh Van Tran

Download or read book '95 Electroweak Interactions and Unified Theories written by J. Thanh Van Tran and published by Atlantica Séguier Frontières. This book was released on 1995 with total page 574 pages. Available in PDF, EPUB and Kindle. Book excerpt:

New Worlds, New Horizons in Astronomy and Astrophysics

Author : National Research Council
Publisher : National Academies Press
ISBN 13 : 0309157994
Total Pages : 324 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis New Worlds, New Horizons in Astronomy and Astrophysics by : National Research Council

Download or read book New Worlds, New Horizons in Astronomy and Astrophysics written by National Research Council and published by National Academies Press. This book was released on 2011-02-04 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt: Driven by discoveries, and enabled by leaps in technology and imagination, our understanding of the universe has changed dramatically during the course of the last few decades. The fields of astronomy and astrophysics are making new connections to physics, chemistry, biology, and computer science. Based on a broad and comprehensive survey of scientific opportunities, infrastructure, and organization in a national and international context, New Worlds, New Horizons in Astronomy and Astrophysics outlines a plan for ground- and space- based astronomy and astrophysics for the decade of the 2010's. Realizing these scientific opportunities is contingent upon maintaining and strengthening the foundations of the research enterprise including technological development, theory, computation and data handling, laboratory experiments, and human resources. New Worlds, New Horizons in Astronomy and Astrophysics proposes enhancing innovative but moderate-cost programs in space and on the ground that will enable the community to respond rapidly and flexibly to new scientific discoveries. The book recommends beginning construction on survey telescopes in space and on the ground to investigate the nature of dark energy, as well as the next generation of large ground-based giant optical telescopes and a new class of space-based gravitational observatory to observe the merging of distant black holes and precisely test theories of gravity. New Worlds, New Horizons in Astronomy and Astrophysics recommends a balanced and executable program that will support research surrounding the most profound questions about the cosmos. The discoveries ahead will facilitate the search for habitable planets, shed light on dark energy and dark matter, and aid our understanding of the history of the universe and how the earliest stars and galaxies formed. The book is a useful resource for agencies supporting the field of astronomy and astrophysics, the Congressional committees with jurisdiction over those agencies, the scientific community, and the public.

Cosmology as a Probe of Fundamental Physics

Author : Godfrey E. Miller
Publisher :
ISBN 13 :
Total Pages : 195 pages
Book Rating : 4.:/5 (862 download)

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Book Synopsis Cosmology as a Probe of Fundamental Physics by : Godfrey E. Miller

Download or read book Cosmology as a Probe of Fundamental Physics written by Godfrey E. Miller and published by . This book was released on 2013 with total page 195 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Advances in Modern Cosmology

Author : Adnan Ghribi
Publisher : BoD – Books on Demand
ISBN 13 : 953307423X
Total Pages : 212 pages
Book Rating : 4.5/5 (33 download)

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Book Synopsis Advances in Modern Cosmology by : Adnan Ghribi

Download or read book Advances in Modern Cosmology written by Adnan Ghribi and published by BoD – Books on Demand. This book was released on 2011-08-29 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt: The twentieth century elevated our understanding of the Universe from its early stages to what it is today and what is to become of it. Cosmology is the weapon that utilizes all the scientific tools that we have created to feel less lost in the immensity of our Universe. The standard model is the theory that explains the best what we observe. Even with all the successes that this theory had, two main questions are still to be answered: What is the nature of dark matter and dark energy? This book attempts to understand these questions while giving some of the most promising advances in modern cosmology.

Observational and Physical Cosmology

Author : F. Sánchez
Publisher : Cambridge University Press
ISBN 13 : 9780521419963
Total Pages : 356 pages
Book Rating : 4.4/5 (199 download)

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Book Synopsis Observational and Physical Cosmology by : F. Sánchez

Download or read book Observational and Physical Cosmology written by F. Sánchez and published by Cambridge University Press. This book was released on 1992-02-27 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of a very exciting and successful conference on observational and physical cosmology.

Statistical Challenges in Astronomy

Author : Eric D. Feigelson
Publisher : Springer Science & Business Media
ISBN 13 : 0387215298
Total Pages : 512 pages
Book Rating : 4.3/5 (872 download)

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Book Synopsis Statistical Challenges in Astronomy by : Eric D. Feigelson

Download or read book Statistical Challenges in Astronomy written by Eric D. Feigelson and published by Springer Science & Business Media. This book was released on 2006-05-26 with total page 512 pages. Available in PDF, EPUB and Kindle. Book excerpt: Digital sky surveys, high-precision astrometry from satellite data, deep-space data from orbiting telescopes, and the like have all increased the quantity and quality of astronomical data by orders of magnitude per year for several years. Making sense of this wealth of data requires sophisticated statistical techniques. Fortunately, statistical methodologies have similarly made great strides in recent years. Powerful synergies thus emerge when astronomers and statisticians join in examining astrostatistical problems and approaches. The book begins with an historical overview and tutorial articles on basic cosmology for statisticians and the principles of Bayesian analysis for astronomers. As in earlier volumes in this series, research contributions discussing topics in one field are joined with commentary from scholars in the other. Thus, for example, an overview of Bayesian methods for Poissonian data is joined by discussions of planning astronomical observations with optimal efficiency and nested models to deal with instrumental effects. The principal theme for the volume is the statistical methods needed to model fundamental characteristics of the early universe on its largest scales.

Fine-Tuning in the Physical Universe

Author : David Sloan
Publisher : Cambridge University Press
ISBN 13 : 1316997278
Total Pages : 571 pages
Book Rating : 4.3/5 (169 download)

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Book Synopsis Fine-Tuning in the Physical Universe by : David Sloan

Download or read book Fine-Tuning in the Physical Universe written by David Sloan and published by Cambridge University Press. This book was released on 2020-10-29 with total page 571 pages. Available in PDF, EPUB and Kindle. Book excerpt: Is the universe fine-tuned for complexity, life, or something else? This comprehensive overview of fine-tuning arguments in physics, with contributions from leading researchers in their fields, sheds light on this often used but seldom understood topic. Each chapter reviews a specific subject in modern physics, such as dark energy, inflation, or solar system formation, and discusses whether any parameters in our current theories appear to be fine-tuned and, if so, to what degree. Connections and differences between these fine-tuning arguments are made clear, and detailed mathematical derivations of various fine-tuned parameters are given. This accessible yet precise introduction to fine-tuning in physics will aid students and researchers across astrophysics, atomic and particle physics and cosmology, as well as all those working at the intersections of physics and philosophy.