Ignatios Antoniadis Knihy

Exploring the mathematical elegance of string theory, this book presents a unified framework for understanding fundamental interactions in the universe. It addresses the challenge of unobserved strings and extra dimensions, suggesting that these dimensions may be larger and more accessible than previously thought, potentially detectable in future particle colliders. The author introduces key concepts, including low scale gravity and the mass hierarchy problem related to the Higgs particle's quantum instability, offering an alternative to low energy supersymmetry.

Supersymmetry (SUSY) is a new symmetry that relates bosons and fermions, which has strong support at both the mathematical and the physical level. This book offers a comprehensive review, following the development of SUSY from its very early days up to present. The order of the contributions should provide the reader with the historical development as well as the latest theoretical updates and interpretations, and experimental constraints from particle accelerators and dark matter searches. It is a great pleasure to bring together here contributions from authors who initiated or have contributed significantly to the development of this theory over so many years. To present a balanced point of view, the book also includes a closing contribution that attempts to describe the physics beyond the Standard Model in the absence of SUSY. The contributions to this book have been previously published in The European Physical Journal C - Particles and Fields.