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Author : Silvia Galli
Release : 2011
Genre :
Kind : eBook
Book Rating : /5 ( reviews)
Book Synopsis Constraining the Thermal History of the Universe with the Cosmic Microwave Background by : Silvia Galli
Download or read book Constraining the Thermal History of the Universe with the Cosmic Microwave Background written by Silvia Galli. This book was released on 2011. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Silvia Galli
Release : 2011
Genre :
Kind : eBook
Book Rating : /5 ( reviews)
Book Synopsis Constraining the Thermal History of the Universe with the Cosmic Microwave Background by : Silvia Galli
Download or read book Constraining the Thermal History of the Universe with the Cosmic Microwave Background written by Silvia Galli. This book was released on 2011. Available in PDF, EPUB and Kindle. Book excerpt: The excellent agreement between the Standard Model of Cosmology and the recent measurements of the Cosmic Microwave Background (CMB) permits to constrain a wide range of physical processes. In particular, in this thesis we exploit the remarkable agreement between the theoretical description of the recombination process, occurring at z~1000, and the CMB data to severely constrain phenomena that affect the evolution of the thermal history of the universe. This contributes answering some important issues still unsolved in the standard model of cosmology. We first address the problem of the nature of dark matter. An extra energy injection due to dark matter annihilation during the epoch of recombination would affect the shape of the CMB power spectra. This allows to constrain dark matter properties using the CMB. The second question regards the validity of conventional physics to describe the Universe. New fundamental theories might predict the space-time variation of fundamental 'constants'. In this thesis we test the constancy of the gravitational constant and of the fine structure constant using the CMB. The third question concerns the characteristics (and in particular, the evolution) of dark energy. The information that can be extracted from the CMB is limited, making necessary the use of complementary probes that can break degeneracies between parameters. This is the case for the evolution of the dark energy equation of state with time, that the CMB can only weakly constrain. We thus show how the observation of clusters of galaxies combined with CMB can be a powerful tool to constrain dark energy.
Author : Slobodan Perovic
Release : 2024-06-30
Genre : Science
Kind : eBook
Book Rating : 60X/5 ( reviews)
Book Synopsis The Cosmic Microwave Background by : Slobodan Perovic
Download or read book The Cosmic Microwave Background written by Slobodan Perovic. This book was released on 2024-06-30. Available in PDF, EPUB and Kindle. Book excerpt: Explanations of the cosmic microwave background prompt this unique case study of theory building in modern science.
Author : Amedeo Balbi
Release : 2008-10-16
Genre : Science
Kind : eBook
Book Rating : 283/5 ( reviews)
Book Synopsis The Music of the Big Bang by : Amedeo Balbi
Download or read book The Music of the Big Bang written by Amedeo Balbi. This book was released on 2008-10-16. Available in PDF, EPUB and Kindle. Book excerpt: Ever since its infancy, humankind has been seeking answers to some very basic and profound questions. Did the Universe begin? If it did, how old is it, and where did it come from? What is its shape? What is it made of? Fascinating myths and brilliant in- itions attempting to solve such enigmas can be found all through the history of human thought. Every culture has its own legends, itsownworldcreationtales,itsphilosophicalspeculations,itsre- gious beliefs. Modern science, however, cannot content itself with fanciful explanations, no matter how suggestive they are. No- days, our theories about the Universe, built upon rational ded- tion, have to survive the hard test of experiment and observation. Cosmology, the science which studies the origin and evo- tion of the Universe, had to overcome enormous dif?culties before it could achieve the same level of dignity as other physical dis- plines. At ?rst, it had no serious physical model and mathematical tools that could be used to address the complexity of the problems it had to face. Then, it suffered from a chronic lack of experim- tal data, which made it almost impossible to test the theoretical speculations. Given this situation, answering rigorously the many questions on the nature of the Universe seemed nothing more than a delusion. Today, however, things have changed. We live in the golden age of cosmology: an exciting moment, when, for the ?rst time, we are able to scienti?cally understand our Universe.
Author : Norma G. Sànchez
Release : 2012-12-06
Genre : Science
Kind : eBook
Book Rating : 585/5 ( reviews)
Book Synopsis The Early Universe and the Cosmic Microwave Background: Theory and Observations by : Norma G. Sànchez
Download or read book The Early Universe and the Cosmic Microwave Background: Theory and Observations written by Norma G. Sànchez. This book was released on 2012-12-06. Available in PDF, EPUB and Kindle. Book excerpt: The goal of the Daniel Chalonge School on Astrofundamental Physics is to contribute to a theory of the universe (and particularly of the early universe) up to the marks, and at the scientific height of, the unprecedented accuracy, existent and expected, in the observational data. The impressive development of modern cosmology during the last decades is to a large extent due to its unification with elementary particle physics and quantum field theory. The cross-section between these fields has been increasing setting up Astrofundamental Physics. The early universe is an exceptional (theoretical and experimental) laboratory in this new discipline. This NATO Advanced Study Institute provided an up dated understanding, from a fundamental physics and deep point of view, of the progress and key issues in the early universe and the cosmic microwave background: theory and observations. The genuine interplay with large scale structure formation and dark matter problem were discussed. The central focus was placed on the cosmic microwave background. Emphasis was given to the precise inter-relation between fundamental physics and cosmology in these problems, both at the theoretical and experimental/observational levels, within a deep and well defined programme which provided in addition, a careful interdisciplinarity. Special sessions were devoted to high energy cosmic rays, neutrinos in astrophysics, and high energy astrophysics. Deep understanding, clarification, synthesis, careful interdisciplinarity within a fundamental physics framework, were the main goals of the course.
