Introduction

Special relativity is a fundamental theory in physics formulated by Albert Einstein in 1905 that revolutionized our understanding of space, time, and motion. It is based on two key postulates: the laws of physics are the same in all inertial frames of reference, and the speed of light in a vacuum is constant and independent of the motion of the light source or observer. Special relativity introduces concepts such as time dilation, length contraction, and the relativity of simultaneity, which challenge classical notions of absolute time and space. The theory also leads to the famous equation , establishing the equivalence of mass and energy. Special relativity has profound implications for modern physics, influencing fields such as particle physics, cosmology, and the development of technologies like GPS.

Contents

Principles and Phenomena

Postulates of Special Relativity
The Lorentz Transformations

Formalism: Symmetry and Geometry

The Minkowski Spacetime and Poincaré Group