A P Balachandran has a long and impressive record of research in particle physics and quantum field theory, bringing concepts of geometry, topology and operator algebras to the analysis of physical problems, particularly in particle physics and condensed matter physics. He has also had an influential role within the physics community, not only in terms of a large number of students, research associates and collaborators, but also serving on the editorial boards of important publications, including the International Journal of Modern Physics A.This book consists of articles by students and associates of Balachandran. Most of the articles are scientific in nature, with topics ranging from noncommutative geometry, particle physics phenomenology, to condensed matter physics. Various chapters focus on new perspectives and directions resulting from Balachandran’s contributions to physics, as well as some reminiscences of collaborating and working with Balachandran.Key FeaturesThe book will help to crystallize a clear perspective of Balachandran’s contributions and how they have influenced physics over the last fifty years or soThe inclusion of new directions which emerged from his research will also highlight the continuing potential for future researchThe book will be of interest to physicists and graduate students from both research and history-of-physics points of view

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