Volume 22: Pages 304-317, 2009
An introduction to relativity: Space time and the principle of equivalence
Satya Pal Singh 1
1Department of Physics and Electronics, Dr. R M L Avadh University, Faizabad 224001, UP, India; present address: Department of Chemical Engineering, NL-II, 202B, Molecular Simulation and Statistical Thermodynamics Laboratory, Indian Institute of Technology, Kanpur 208016, India
This essay deals with the conception of space time and equivalence principle giving a rejustification for the new meaning of relativity as proposed by Einstein. Experiments and examples which can feed back with a scrutiny and ably detect even a slightest flaw in Einstein’s theory of relativity and gravitation are given in order to reach to a scientific conclusion in a more logical manner in light of present known scientific events. Hawking [The Theory of Everything (Jaico, Delhi, 2008)] argued that the psychological arrow is determined by the thermodynamic arrow of time and both always point in the same direction. Few examples of stochastic processes are discussed which may not allow one to reach to the same conclusions as Hawking argued regarding the arrow of time. I have discussed varying speed of light theories and their Lorentz symmetry breaking which seem to exist in some corner events of nature and are supposed to be a part of early Universe evolution. First relativity principle also known as relativity principle is usually considered as a complete symmetry among infinitely large class of observers moving with constant relative velocity with respect to each other. Such symmetry also exists in general relativity between an observer in an accelerated frame and another one in a weak gravitational field. A rationale approach has been developed to give the coherent idea of space time and the principle of equivalence when introducing to relativity. Einstein gave his theory of relativity nearly a century back. Many new scientific events have been discovered since then. But the concepts of relativity remain unparallel though many experiments at very microscopic and large scales have raised many intriguing questions.
Keywords: Gravitationally Induced Collapses, Causality and VSL Theories, Arrows of Time, Relaxation Processes in Paramagnetic Liquids and Salts, Boundary Condition of Universe, Random Variable and Spin Correlations, Universal Gravitational Red Shift, Pioneer Anomaly, Gravity Probes A and B, Stringy Space-Time Foam Model and Microscopic Relativity
Received: October 3, 2008; Accepted: May 22, 2009; Published Online: July 14, 2009