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BLACK HOLES IN THE FRAMEWORK OF THE FOUR DIMENSIONAL EFFECTIVE THEORY OF HETEROTIC SUPERSTRINGS AT LOW ENERGIES

By ΠΑΝΑΓΙΩΤΑ ΚΑΝΤΗ

Abstract

SUPERSTRING THEORY IN THE MOST PROMISING UNIFICATION SCHEME OF THE FOUR FORCES OF NATURE. BLACK HOLES ARE THE FIRST SOLUTIONS OF EINSTEIN'S FIELD EQUATIONS AND THEIR PROPERTIES ARE DEFINED BY VARIOUS THEOREMS OF THE THEORY OF GENERAL RELATIVITY, MAINLY BY THE "NO-HAIR" THEOREMS. THE LOW ENERGY EFFECTIVE STRING THEORY PLAYS THE ROLE OF THE CONNECTING LINK BETWEEN THESE TWO THEORIES. IN THE FRAMEWORK OF THIS EFFECTIVE THEORY, WE SEARCH FOR NEW BLACK HOLE SOLUTIONS. THE ANALYTICAL EXPRESSIONS OF ALL THE SCALAR FIELDS OF THE EFFECTIVE THEORY IS DETERMINED IN A KERR-NEWMAN BLACK HOLE BACKGROUND AND THE EVASION OF THE EXISTING "NO-HAIR" THEOREMS IN THE PRESENCE OF HIGHER CURVATURE GRAVITATIONAL TERMS IS DEMONSTRATED. NEW BLACK HOLE SOLUTIONS, SUCH AS THE "DILATONIC" AND "COLOURED", BLACH HOLES, ARE DETERMINED BY USE OF NUMERICAL INTEGRATION. FINALLY, THE LINEAR STABILITY OF "DILATONIC" BLACK HOLES UNDER SMALL TIME-DEPENDENT PERTURBATIONS IS EXHIBITED THROUGH A SEMI-ANALYTIC METHOD.ACCORDING TO THE ABOVE, THE EFFECTIVE SUPERSTRING THEORY CAN BE CONSIDEREDAS A SUCCESSFUL AND EXTREMELY INTERESTING GENERALISED THEORY OF GRAVITY.

Topics: "NO HAIR" THEOREMS, Black holes, DETERMINATION OF NEW BLACK HOLE SOLUTIONS, EFFECTIVE THEORY AT LOW ENERGIES, GRAVITATIONAL TERMS OF HIGHER CURVATURE (GAUSS-BONNET), THEORY OF HETEROTIC SUPERSTRINGS, Βαρυτικοί όροι ανώτερης καμπυλότητας (GAUSS-BONNET), ΕΝΕΡΓΟΣ ΘΕΩΡΙΑ ΧΟΡΔΩΝ ΣΤΙΣ ΧΑΜΗΛΕΣ ΕΝΕΡΓΕΙΕΣ, ΕΥΡΕΣΗ ΛΥΣΕΩΝ ΜΑΥΡΩΝ ΟΠΩΝ, ΘΕΩΡΗΜΑΤΑ ΥΠΑΡΞΗΣ ΛΥΣΕΩΝ ΜΑΥΡΩΝ ΟΠΩΝ, ΘΕΩΡΙΑ ΕΤΕΡΟΤΙΚΩΝ ΥΠΕΡΧΟΡΔΩΝ, ΜΑΥΡΕΣ ΟΠΕΣ
Publisher: University of Ioannina
Year: 1998
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