BOOK  REVIEW

The Dawn of the Universe And, what a book this is! Rarely does a popular book hold the attention of an active researcher in the field and compel him to read Tarun Souradeep it carefully from cover to cover (leading to inordinate delays in writing a book review, much to the annoyance of the editors). This book is a must-read for all high school and The Dawn of the Universe under-graduate students fascinated by and cu- Biman B Nath rious about the cosmos. The simple style of Universities Press, Hyderabad p.172, Price:Rs.125/-, 2005. writing makes it easy to read. It is almost as if someone is talking to you through the pages and giving you a balanced picture of contem- porary cosmology. The book is concise and Cosmology has always been a branch of sci- the chapters are short, and yet the magic is that ence whose appeal readily transcends the you cover immense ground and learn a lot. scientific community. The very audacity of The text refers to notes that outline simple science to grapple with the understanding of mathematical calculations which provide fod- the origin and evolution of the entire cosmos der to the more enthusiastic student to delve does explain why popular books on cosmol- further into some of the topics. ogy rapidly disappear from the shelves of bookstores. However, many of these books The reader is led gently into the realm of the lure readers by portraying speculative as- cosmos in the first chapter. While most of the pects at the front-line of research as ‘sort-of- readers would have read about the Solar sys- established’ science. Here is a book that tem before, the excellent section on the local doesn’t do so! Consequently, it is probably stellar neighborhood of the Solar system (sec- not a popular science book that the casual, tion 1.4) is a treat even for seasoned astrono- mildly curious public would pick up from mers. Then the ‘horizon’ gradually opens up in book store chains and enjoy reading. It is a steps, up to a current view of the distribution package essentially meant for young minds of galaxies on cosmological scales available that want to have an understanding of cos- from the recent surveys in the past decade. All mology, rather than simply goggle wide-eyed this happens so smoothly, that you are taken at fascinating, mysterious ideas. While books aback at the long journey made in the few that dwell on speculative research frontiers pages. certainly have their own role, it is also impor- tant that we attract young minds to the thrills Cosmology is arguably the most spectacular of cosmology with a contemporary perspec- application of the modern theory of gravita- tive and a clear conscience. tion. Einstein’s theory of general relativity

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(GR) led to an intellectual revision of a space- The chapter covers a lot of ground with a time from a mute background to the natural well-balanced emphasis on aspects based world to a dynamical entity that participates on established physics and that which is equally in the motion of matter. The expanding more speculative. This is a refreshing de- (or contracting) universe emerges from the sim- parture from attempts to jazz up cosmology plest of applications of GR to the observed with sensational ideas based on speculative homogeneity of distribution of matter and ra- early universe of higher dimensions, yet diation in the universe. While most popular unknown interactions and high-brow ‘fun- texts on cosmology prefer to skirt around a damental’ physics. In this era of immense description of relativity and introduce cosmol- improvement in observations, cosmology is ogy using Newtonian gravitation, this text takes now rich and exciting enough with the the bull by its horns and starts with a concise, observationallywell-established perspective yet lucid, introduction to special relativity and of the early universe. Exquisite measure- then its extension to general theory of relativity. ments of the fluctuations in the Cosmic That this could be achieved so successfully in a microwave temperature, surveys of galax- single chapter of the short book is simply amaz- ies reaching to the vast expanses on the ing! I recommend this section to any high observable universe, etc., discussed in the school or undergraduate student as a first brief book, have shifted the emphasis in cosmol- exposition to relativity. Perhaps it will not be ogy to more concrete endeavors and away out of place to recommend this also to others, from traditional theoretical speculation. like me, who dream of reaching out so easily to young minds on advanced topics. The sections In modern cosmology, the remarkable of this chapter are quite a masterpiece of peda- progress in the past few decades has come gogy. In particular, the section on the Olber’s from the intense interplay of theory and paradox is again a treat. The author has care- observations of the large scale structures in fully hand picked the most effective analogies the distribution of matter traced by galaxies from other introductory texts to explain con- and its encryption in the relic fluctuations of cepts in terms of day to day experiences. For the cosmic microwave background radia- recent observations he has even constructed tion. Here again, the author has not shirked very original analogies, such as that of deducing from the difficult task of introducing impor- the accelerated expansion of the universe from tant concepts that underlie the tools of the supernova data with inferring the economic his- trade. The reader is introduced to concepts tory of a civilization using the archaeological such as the power spectrum of fluctuations study of coins. using clear analogy to day-to-day experi- ences. In the final few chapters, the reader is The entire description of the early universe is transported to the front-line of our under- again masterfully packed into a concise chapter. standing of structure formation and evolu-

86 RESONANCE  May 2007 BOOK  REVIEW tion and formation of its tracers, the galaxies. ing more information into some of them. A The book also familiarizes the reader with the section in the text, or, notes on the ongoing major observational facilities that have been research in these areas in India will be a developed in India. welcome resource for the Indian students.

It is not easy to suggest improvements in this In summary, this is an excellent book for the wonderful book. A more elaborate text book young, curious minds in our high schools and for undergraduates that builds upon this book undergraduate colleges providing an up-to- by including the material in the notes, into the date, no nonsense introduction to contempo- text would be a valuable resource. Books in rary cosmology. The book should certainly regional languages can potentially reach a be made available in the libraries of every much wider audience. It is heartening that the school and college. This is also a perfect book (an earlier version of it) first appeared in resource material to distribute in the many a regional language, Bengali. I sure hope that introductory workshops for promising stu- the author will make the effort to update the dents and refresher courses for school/college Bengali version based on this new version. teachers. The modest price would also allow The quality of the figures has a lot of room for many students to make a well-justified invest- improvement and something that should be ment in a personal copy. given consideration in the future editions. Price permitting, the inclusion of color fig- Tarun Souradeep, Associate Professor, IUCAA, Post Bag 4, Ganeshkhind, Pune 411007, India. ures would make it attractive and allow pack- Email: [email protected]

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