منابع مشابه
Nonsingular global string compactifications
We consider an exotic "compactification" of spacetime in which there are two infinite extra dimensions, using a global string instead of a domain wall. By having a negative cosmological constant we prove the existence of a nonsingular static solution using a dynamical systems argument. A nonsingular solution also exists in the absence of a cosmological constant with a time-dependent metric. We ...
متن کاملNonsingular static global string
A new solution for the spacetime outside the core of a U (1) static global string has been presented which is nonsingular. This is the first example of a nonsingular spacetime around a static global string. It is believed that early universe has undergone a number of phase transitions as it cooled down from the hot initial phase. One of the immediate consequences of these phase transitions is t...
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We calculate emission rates of a massless state from a highly excited rotating string in perturbative bosonic open string theory. By averaging huge degeneracies of initial string states with specifying the mass and a single component of the angular momentum, we find thermal spectrum in a wide range of the angular momentum. We derive the temperature that characterizes the thermal spectrum from t...
متن کاملScaling Property of the global string in the radiation dominated universe
We investigate the evolution of the global string network in the radiation dominated universe by use of numerical simulations in 3+1 dimensions. We find that the global string network settles down to the scaling regime where the energy density of global strings, ρs, is given by ρs = ξμ/t 2 with μ the string tension per unit length and the scaling parameter, ξ ∼ (0.9− 1.3), irrespective of the c...
متن کاملDEVELOPMENT IN STRING THEORY
The string theory is a fast moving subject, both physics wise and in the respect of mathematics. In order to keep up with the discipline it is important to move with new ideas which are being stressed. Here I wish to give extracts from new papers of ideas which I have recently found interesting. There are six papers which are involved: I ."Strings formulated directly in 4 dimensions " A. N...
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ژورنال
عنوان ژورنال: Nuclear Physics B
سال: 1994
ISSN: 0550-3213
DOI: 10.1016/0550-3213(94)90573-8