quantum field theory

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quantum field theory
Albert Einstein's theory of relativity is actually two separate theories: his special theory of relativity, postulated in the 1905 paper, The Electrodynamics of Moving Bodies and his theory of general relativity, an expansion of the earlier theory, published as The Foundation of the General Theory of Relativity in 1916. Einstein sought to describe situations in which Newtonian physics might fail to deal successfully with phenomena, and in so doing proposed advanced changes in human concepts of time, space, and gravity.

The special theory of relativity was based on two main postulates: first, that the speed of light is consistent for all observers; and second, that observers moving at consistent speeds will be subject to the same physical laws. Following this logic, Einstein theorized that time needs to change according to the speed of a moving object relative to the frame of referral of an observer. Scientists have tested this theory through experimentation - verifying, for example, that an atomic clock ticks more slowly when traveling at a high speed than it does when it is not moving. The essence of Einstein's paper was that both space and time are relative (rather than absolute), which was claimed to hold true in a special case, the absence of a gravitational field. Relativity was a sensational concept at the time; scientists throughout the world debated the veracity of Einstein's popular equation, E=mc2, which implied that matter and energy were equivalent and, more specifically, that a single particle of matter can be converted into a substantial quantity of energy. However, considering that the special theory of relativity only held true in the absence of a gravitational field, Einstein strove for 11 more years to work gravity into his equations and discover how relativity might work normally as well.

According to the Theory of General Relativity, matter creates space to curve. It is posited that gravitation is not a force, as recognized by Newtonian physics, but a curved field (an area of space under the influence of a force) in the space-time continuum that is actually developed by the presence of mass. According to Einstein, that theory can be tested by gauging the deflection of starlight traveling near the sun; he correctly asserted that light deflection would be twice that expected by Newton's laws. This theory also described why the light from stars in a strong gravitational field was closer to the red end of the spectrum than those in a weaker one.

For the final thirty years of his life, Einstein attempted to find a unified field theory, in which the properties of all matter and energy can be shared in a single equation. His search was confounded by quantum theory's uncertainty principle, which stated that the movement of a single particle can never be accurately gauged, due to the fact that speed and position can not be all at once examined with any kind of degree of assurance. Although he was unable to find the detailed theory that he sought, Einstein's pioneering work has allowed many other scientists to carry on the pursuit for what some have called "the holy grail of physicists.".