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This book describes, in clear terms, the Why, What and the How of Quantum Field Theory. The raison d'etre of QFT is explained by starting from the dynamics of a relativistic particle and demonstrating how it leads to the notion of quantum fields. Non-perturbative aspects and the Wilsonian interpretation of field theory are emphasized right from the start. Several interesting topics such as the Schwinger effect, Davies-Unruh effect, Casimir effect and spontaneous symmetry breaking introduce the reader to the elegance and breadth of applicability of field theoretical concepts. Complementing the conceptual aspects, the book also develops all the relevant mathematical techniques in detail, leading e.g., to the computation of anomalous magnetic moment of the electron and the two-loop renormalisation of the self-interacting scalar field. It contains nearly a hundred problems, of varying degrees of difficulty, making it suitable for both self-study and classroom use. .

Atomic Physics --- Physics --- Physical Sciences & Mathematics --- Quantum theory. --- Quantum Field Theories, String Theory. --- Elementary Particles, Quantum Field Theory. --- Mathematical Physics. --- Quantum dynamics --- Quantum mechanics --- Quantum physics --- Mechanics --- Thermodynamics --- Quantum field theory. --- Atomic Physics. --- String theory. --- Elementary particles (Physics). --- Mathematical physics. --- Relativistic quantum field theory --- Field theory (Physics) --- Quantum theory --- Relativity (Physics) --- Physical mathematics --- Elementary particles (Physics) --- High energy physics --- Nuclear particles --- Nucleons --- Nuclear physics --- Models, String --- String theory --- Nuclear reactions --- Mathematics

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Astrophysics --- Cosmology --- Astrophysique --- Cosmologie

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India has a strong and ancient tradition of astronomy, which seamlessly merges with the current activities in Astronomy and Astrophysics in the country. While the younger generation of astronomers and students are reasonably familiar with the current facilities and the astronomical research, they might not have an equally good knowledge of the rich history of Indian astronomy. This particular volume, brought out as a part of the Platinum Jubilee Celebrations of Indian National Science Academy, concentrates on selected aspects of historical development of Indian astronomy in the form of six invited chapters. Two of the chapters – by Balachandra Rao and M.S. Sriram – cover ancient astronomy and the development of calculus in the ancient Kerela text Yuktibhasa. The other four chapters by B.V. Sreekantan, Siraj Hasan, Govind Swarup and Jayant Narlikar deal with the contemporary history of Indian astronomy covering space astronomy, optical astronomy, radio astronomy and developments in relativistic astrophysics. These chapters, written by experts in the field, provide an in-depth study of the subject and make this volume quite unique.

Science --- Ethnology. Cultural anthropology --- Pure sciences. Natural sciences (general) --- Space research --- Cosmology --- History of physics --- Physics --- Economic geography --- wetenschapsgeschiedenis --- astrofysica --- popularisering wetenschap --- culturele antropologie --- geografie --- fysica --- ruimte (astronomie) --- astronomie --- kosmologie --- India

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Cosmology --- Gauge fields (Physics) --- General relativity (Physics) --- Quantum field theory --- Quantum gravity --- Gravity, Quantum --- Gravitation --- Quantum theory --- Relativistic quantum field theory --- Field theory (Physics) --- Relativity (Physics) --- Relativistic theory of gravitation --- Relativity theory, General --- Physics --- Fields, Gauge (Physics) --- Gage fields (Physics) --- Gauge theories (Physics) --- Group theory --- Symmetry (Physics) --- Astronomy --- Deism --- Metaphysics --- Cosmology. --- Quantum field theory. --- Quantum gravity. --- Gauge fields (Physics). --- General relativity (Physics).