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String phenomenology is the part of string theory that attempts to construct realistic models of particle physics based on string and M-theory. [64] Typically, such models are based on the idea of compactification. [l] Starting with the ten- or eleven-dimensional spacetime of string or M-theory, physicists postulate a shape for the extra ...
M-theory is a theory of quantum gravity; and as all others it has not gained experimental evidence that would confirm its validity. [1] It also does not single out our observable universe as being special, and so does not aim to predict from first principles everything we can measure about it.
String theory has been used to construct a variety of models of particle physics going beyond the standard model. Typically, such models are based on the idea of compactification. Starting with the ten- or eleven-dimensional spacetime of string or M-theory, physicists postulate a shape for the extra dimensions.
According to superstring theory, or more generally string theory, the fundamental constituents of reality are strings with radius on the order of the Planck length (about 10 −33 cm). An appealing feature of string theory is that fundamental particles can be viewed as excitations of the string.
The history of string theory spans several decades of intense research including two superstring revolutions. Through the combined efforts of many researchers, string theory has developed into a broad and varied subject with connections to quantum gravity, particle and condensed matter physics, cosmology, and pure mathematics.
Michael Boris Green FRS HonFInstP (born 22 May 1946) is a British physicist and a pioneer of string theory.He is a professor of theoretical physics in the School of Physics and Astronomy at Queen Mary University of London, emeritus professor in the Department of Applied Mathematics and Theoretical Physics and a Fellow of Clare Hall, Cambridge.
In string theory and related theories (such as supergravity theories), a brane is a physical object that generalizes the notion of a zero-dimensional point particle, a one-dimensional string, or a two-dimensional membrane to higher-dimensional objects.
His interests lie in unified theories of the elementary particles, quantum gravity, supergravity, Kaluza–Klein theory, superstrings, supermembranes and M-theory. [3] He is a Fellow of the Royal Society , a Fellow of the American Physical Society , a Fellow of the Institute of Physics (UK), a Fellow of the Royal Society of Arts and Recipient ...