Magnetogenesis from Cosmological Velocity Perturbations PDF Download
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Author: Maye Elmardi
Publisher: LAP Lambert Academic Publishing
ISBN: 9783843388122
Category :
Languages : en
Pages : 84
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Book Description
Cosmology the branch of astronomy which studies the formation and evolution of the structure of the entire universe on the largest scales. Recent observations seem to indicate the presence of magnetic fields on all scales of the universe. It is possible that magnetic fields have existed since very early times while the mechanisms exist to generate these fields in the late universe. Here in our research we studied the velocity perturbation scenario as a dynamo amplification of the primordial seeds field. We describe the early universe stage as multifluid, consisting of charge-neutral two-component matter and radiation fluids, linearised around the Friedmann-Lemaitre-Robertson-Walker models. The oscillatory behaviour of the electromagnetic field with a new weakly damped mode is identified in addition to the standard gravitational instability picture. Vertical velocity perturbations are further found to generate magnetic fields of sufficient strength to provide a seed for the galactic dynamo. Subsequent amplification in such a way could easily lead to the observed magnetic fields in galaxies."
Author: Maye Elmardi
Publisher: LAP Lambert Academic Publishing
ISBN: 9783843388122
Category :
Languages : en
Pages : 84
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Book Description
Cosmology the branch of astronomy which studies the formation and evolution of the structure of the entire universe on the largest scales. Recent observations seem to indicate the presence of magnetic fields on all scales of the universe. It is possible that magnetic fields have existed since very early times while the mechanisms exist to generate these fields in the late universe. Here in our research we studied the velocity perturbation scenario as a dynamo amplification of the primordial seeds field. We describe the early universe stage as multifluid, consisting of charge-neutral two-component matter and radiation fluids, linearised around the Friedmann-Lemaitre-Robertson-Walker models. The oscillatory behaviour of the electromagnetic field with a new weakly damped mode is identified in addition to the standard gravitational instability picture. Vertical velocity perturbations are further found to generate magnetic fields of sufficient strength to provide a seed for the galactic dynamo. Subsequent amplification in such a way could easily lead to the observed magnetic fields in galaxies."
Author: Maye Yassin Ahmed Elmardi
Publisher:
ISBN:
Category :
Languages : en
Pages : 132
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Author: Eleanor Catherine Nalson
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Shohei Saga
Publisher: Springer
ISBN: 9811080070
Category : Science
Languages : en
Pages : 143
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This thesis sheds valuable new light on the second-order cosmological perturbation theory, extensively discussing it in the context of cosmic microwave background (CMB) fluctuations. It explores the observational consequences of the second-order vector mode, and addresses magnetic field generation and the weak lensing signatures, which are key phenomena of the vector mode. The author demonstrates that the second-order vector mode, which never appears at the linear-order level, naturally arises from the non-linear coupling of the first-order scalar modes. This leads to the remarkable statement that the vector-order mode clearly contributes to the generation of cosmological magnetic fields. Moreover, the weak lensing observations are shown to be accessible to the vector mode. On the basis of ongoing and forthcoming observations, the thesis concludes that the second-order vector mode is detectable.
Author: Lukas Hollenstein
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Author: Christos G. Tsagas
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 213
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Author: Norma G. Sànchez
Publisher: Springer Science & Business Media
ISBN: 9400710585
Category : Science
Languages : en
Pages : 583
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Book Description
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.
Author: Caroline Zunckel
Publisher: LAP Lambert Academic Publishing
ISBN: 9783846524589
Category :
Languages : en
Pages : 156
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Astrophysical observations indicate that almost all environments in the Universe are magnetized, and the more we search for extragalactic fields, the more pervading they are revealed to be. The next logical step is to ask why these large-scale magnetic fields are ubiquitous in a Universe as diverse as ours and how did these fields originate? This thesis attempts to answer this question, using second-order gauge-invariant perturbation theory to develop a self-consistent framework in which the non-linear coupling between inflationary gravitational waves and primordial large-scale magnetic fields can be studied. The magnetic-gravito interaction is shown to produce a sufficient amplification of both a homogeneous and inhomogeneous magnetic field to within the strength limits required to support the galactic dynamo.
Author: Adam J. Christopherson
Publisher:
ISBN:
Category : Cosmic magnetic fields
Languages : en
Pages : 260
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