Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2002-12-10
Phys.Usp.45:915-954,2002; Usp.Fiz.Nauk 45:977-1020,2002
Physics
High Energy Physics
High Energy Physics - Theory
56 pages, 18 figures, LaTeX; based on contribution to Physics Uspekhi
Scientific paper
10.1070/PU2002v045n09ABEH001148
The status of string theory is reviewed, and major recent developments - especially those in going beyond perturbation theory in the string theory and quantum field theory frameworks - are discussed. This analysis helps better understand the role and place of string theory in the modern picture of the physical world. Even though quantum field theory describes a wide range of experimental phenomena, it is emphasized that there are some insurmountable problems inherent in it - notably the impossibility to formulate the quantum theory of gravity on its basis - which prevent it from being a fundamental physical theory of the world of microscopic distances. It is this task, the creation of such a theory, which string theory, currently far from completion, is expected to solve. In spite of its somewhat vague current form, string theory has already led to a number of serious results and greatly contributed to progress in the understanding of quantum field theory. It is these developments which are our concern in this review.
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