Extragalactic Astronomy and Cosmology: An Introduction

Springer Science & Business Media

Starting with the description of our home galaxy the Milky Way, this cogently written textbook introduces the reader to the astronomy of galaxies, their structure, active galactic nuclei, evolution and large scale distribution. Then, from the extensive and thorough introduction to modern observational and theoretical cosmology, the text turns to the formation of structures and astronomical objects in the early universe. The basics of classical astronomy and stellar astrophysics needed for extragalactic astronomy are given in the appendix.

In particular, Peter Schneider’s Extragalactic Astronomy and Cosmology has the goal of imparting the fundamental knowledge of this fascinating subfield of astronomy, while leading readers to the forefront of astronomical research. But it seeks to accomplish this not only with extensive textual information and insights. In addition, the author’s evident admiration for the workings of the universe that shines through the lines and the many supporting color illustrations will deeply inspire the reader.

While this book has grown out of introductory university courses on astronomy and astrophysics, it will not only be appreciated by undergraduate students and lecturers. Through the comprehensive coverage of the field, even graduate students and researchers specializing in related fields will appreciate it as reliable reference.

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About the author

Peter Schneider is a Professor in the Mathematical Institute at the University of M nster.

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Additional Information

Springer Science & Business Media
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Published on
Oct 9, 2006
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Science / Astronomy
Science / Physics / Astrophysics
Science / Physics / General
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Content Protection
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Rune Frederiksen
With a collection of 57 articles in English, French and German, presenting the most recent research on ancient fortifications, this book is the most substantial publication ever to have issued on the topic for many years. While fortifications of the ancient cultures of the middle east and ancient Greek and Roman worlds were noticed by travelers and scholars from the very beginning of research on antiquity from the late 18th century onwards, the architectural, economic, logistical, political, urban and other social aspects of fortifications have been somewhat overlooked and underestimated by scholarship in the 20th century. The book presents the research of a new generation of scholars who have been analyzing those aspects of fortifications, many of them with years of experience in fieldwork on city walls. Much new evidence and a fresh look at this important category of built structure is now made available, and the publication will be of interest not only to the field of ancient architecture, but also to other sub-disciplines of archaeology and ancient history.

The papers were presented at a conference in Athens in December 2012, and they all present material and discuss topics under seven headings that represent the most central themes in the study of fortification in antiquity: the origins of fortification, physical surroundings and building technique, function and semantics, historical context, the fortification of regions and regionally confined phenomena, the fortifications of Athens and new field research.

The book is Volume 2 in the new series Fokus Fortifikation Studies, created by the German based international research network Fokus Fortifikation. The topics included have been identified by the network over many previous conferences and workshops as being the most important and as needing research and discussion beyond the network members. Volume 1 in the series, Ancient Fortifications: a compendium of theory and practice (Oxbow Books) will also appear in 2015 and together the two volumes bring the field of fortification studies up-to-date and will be an essential resource for many years to come.
Peter Schneider
Representation theory studies maps from groups into the general linear group of a finite-dimensional vector space. For finite groups the theory comes in two distinct flavours. In the 'semisimple case' (for example over the field of complex numbers) one can use character theory to completely understand the representations. This by far is not sufficient when the characteristic of the field divides the order of the group.

Modular Representation Theory of finite Groups comprises this second situation. Many additional tools are needed for this case. To mention some, there is the systematic use of Grothendieck groups leading to the Cartan matrix and the decomposition matrix of the group as well as Green's direct analysis of indecomposable representations. There is also the strategy of writing the category of all representations as the direct product of certain subcategories, the so-called 'blocks' of the group. Brauer's work then establishes correspondences between the blocks of the original group and blocks of certain subgroups the philosophy being that one is thereby reduced to a simpler situation. In particular, one can measure how nonsemisimple a category a block is by the size and structure of its so-called 'defect group'. All these concepts are made explicit for the example of the special linear group of two-by-two matrices over a finite prime field.

Although the presentation is strongly biased towards the module theoretic point of view an attempt is made to strike a certain balance by also showing the reader the group theoretic approach. In particular, in the case of defect groups a detailed proof of the equivalence of the two approaches is given.

This book aims to familiarize students at the masters level with the basic results, tools, and techniques of a beautiful and important algebraic theory. Some basic algebra together with the semisimple case are assumed to be known, although all facts to be used are restated (without proofs) in the text. Otherwise the book is entirely self-contained.

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