Books on Einstein and his theories abound. However, this book is uniquely different. It presents key concepts in Special and General Relativity, in verse form. The aim is to make Einstein's insights more fun to learn. It uses rhyme and rhythm to render reading memorable and thus pleasurable. Moreover, what is pleasurable may foster a better understanding, as well as retention, of ideas. Use of verse apparently worked effectively in ancient times: in the Iliad and Odyssey of Homer among the Greeks; in the Vedas and Upanishads of ancient India; both rhyme, in the form of alliteration, and rhythm in Beowulf among the Anglo-Saxons, etc. The target reader is college-educated, or college student in third year, or anyone willing to puzzle it out, who desires to understand why time slows down and lengths contract when objects are in relative motion; how Science, Einstein's theories in particular, can contribute to answering the perennial question: what it is to be human; how to time travel to the future by staying young; etc. Relativity has a reputation of being difficult. For example, curvature of spacetime seems so abstruse, so forbidding a concept. But, do not disarm yourself prematurely. Do not be intimidated. As it turns out, curvature of spacetime is tidal gravity, the cause of familiar ocean tides. You may even have a gut feel for it. This book will not teach you how to solve problems in Relativity. Nor will it teach you how to prove The shortest distance takes the longest time. No, we will spend our time grasping Einstein's insights, their implications on Reality and on mind; and amid our quest, on what it means to be human. More fun to learn does not mean that verse form is the lazy road to learning. It does not mean that verse form makes the difficult easy, or, the rough, plain. No, the difficult remains difficult; the rough remains rough. And to grasp it, you have to exert a determined, sustained effort and be willing to stretch your mind to accommodate the wild notions in Relativity. The idea motivating this book is to make the stretching more enjoyable relative to prose by using the rhyme-rhythm features of verse. But, stretch your mind, you have to. There is no royal, poetic road to learning There is a feature in our history, that stands out in view of our concerns in conveying knowledge-a feature that the ancients aptly used. It is the oral tradition. Since the first humans appeared, oral tradition was the sole means in transmitting knowledge for a very long time, indeed. If we fit the whole time since the first humans lived into a year, then writing started only about the morning of 30th of December. That is a huge time in which oral tradition operated, i.e. about 99.5% of our time as humans. What does this imply? We transmitted information orally; and we received information aurally This oral-aural conveyance was the way for all information, including that of knowledge. In addition, during the five hundred thousand years or so, oral tradition honed our brains to receive knowledge aurally. To me, this implies that our brains have a natural deep resonance to features of language in the oral tradition. The key language features in the oral tradition are the rhymes and rhythms of verse. I wrote this book in verse, inspired by this thought: to make the most out of the resonant structures in our brains engendered by oral tradition, to convey the deep insights of Einstein on Reality. It is my sincere wish that Einstein's ideas will find recognition in the public understanding and thus inform the public outlook. I invite you, everyone: Hop in with me, a time machine we ride, Intent on chasing space-time concepts wild; To fathom Einstein's insights into Reality, In his Special and General Relativity. Like Wordsworth, a lonely cloud wandering, Through space and time we will be winging, Not to appreciate the daffodils of Nature; But to understand Nature's Architecture

The meaning of life and light are not simple to explain. The universe cannot exist without either of these critical dimensional components. Light is not the reflection of electro-magnetic waves we have been taught in school and existence without life is meaningless. After you read this book, things will become clearer to you.

Introduction to General Relativity and Cosmology gives undergraduate students an overview of the fundamental ideas behind the geometric theory of gravitation and spacetime. Through pointers on how to modify and generalise Einstein's theory to enhance understanding, it provides a link between standard textbook content and current research in the field.Chapters present complicated material practically and concisely, initially dealing with the mathematical foundations of the theory of relativity, in particular differential geometry. This is followed by a discussion of the Einstein field equations and their various properties. Also given is analysis of the important Schwarzschild solutions, followed by application of general relativity to cosmology. Questions with fully worked answers are provided at the end of each chapter to aid comprehension and guide learning. This pared down textbook is specifically designed for new students looking for a workable, simple presentation of some of the key theories in modern physics and mathematics.

The notion that fundamental equations governing the motions of physical systems are invariant under the time reversal transformation (T) has been an important, but often subliminal, element in the development of theoretical physics. It serves as a powerful and useful tool in analyzing the structure of matter at all scales, from gases and condensed matter to subnuclear physics and the quantum theory of fields. The assumption of invariance under T was called into question, however, by the 1964 discovery that a closely related assumption, that of CP invariance (where C is charge conjugation and P is space inversion), is violated in the decay of neutral K mesons.
In The Physics of Time Reversal, Robert G. Sachs comprehensively treats the role of the transformation T, both as a tool for analyzing the structure of matter and as a field of fundamental research relating to CP violation. For this purpose he reformulates the definitions of T, P, and C so as to avoid subliminal assumptions of invariance. He summarizes the standard phenomenology of CP violation in the K-meson system and addresses the question of the mysterious origin of CP violation. Using simple examples based on the standard quark model, Sachs summarizes and illustrates how these phenomenological methods can be extended to analysis of future experiments on heavy mesons. He notes that his reformulated approach to conventional quantum field theory leads to new questions about the meaning of the transformations in the context of recent theoretical developments such as non-Abelian gauge theories, and he suggests ways in which these questions may lead to new directions of research.

*Selected as a Book of the Year 2016 in the Sunday Times* The full inside story of the detection of gravitational waves at LIGO, one of the most ambitious feats in scientific history. Travel around the world 100 billion times. A strong gravitational wave will briefly change that distance by less than the thickness of a human hair. We have perhaps less than a few tenths of a second to perform this measurement. And we don't know if this infinitesimal event will come next month, next year or perhaps in thirty years. In 1916 Einstein predicted the existence of gravitational waves: miniscule ripples in the very fabric of spacetime generated by unfathomably powerful events. If such vibrations could somehow be recorded, we could observe our universe for the first time through sound: the hissing of the Big Bang, the whale-like tunes of collapsing stars, the low tones of merging galaxies, the drumbeat of two black holes collapsing into one. For decades, astrophysicists have searched for a way of doing so... In 2016 a team of hundreds of scientists at work on a billion-dollar experiment made history when they announced the first ever detection of a gravitational wave, confirming Einstein's prediction. This is their story, and the story of the most sensitive scientific instrument ever made: LIGO. Based on complete access to LIGO and the scientists who created it, Black Hole Blues provides a firsthand account of this astonishing achievement: a compelling, intimate portrait of cutting-edge science at its most awe-inspiring and ambitious.