Effects of Magnetic Fields on String Pair Creation
نویسنده
چکیده
The rate of pair production of open strings in general uniform electromagnetic fields is calculated in various space-time dimensions. The corrections with respect to the case of pure electric backgrounds are displayed. In particular, a contribution in the form of a Born-Infeld action is derived and its role in the present context emphasized
منابع مشابه
Design and Fabrication of Helmholtz Coils to Study the Effects of Pulsed Electromagnetic Fields on the Healing Process in Periodontitis: Preliminary Animal Results
Background: Effects of electromagnetic fields on healing have been investigated for centuries. Substantial data indicates that exposure to electromagnetic field can lead to enhanced healing in both soft and hard tissues. Helmholtz coil is a device that generates pulsed electromagnetic fields. Objective: In this study, a pair of Helmholtz coils for enhancing thehealing process in periodontitis w...
متن کاملNucleation of p-branes and fundamental strings.
We construct a solution to the low-energy string equations of motion in five dimensions that describes a circular loop of fundamental string exponentially expanding in a background electric H-field. Euclideanising this gives an instanton for the creation of a loop of fundamental string in a background H-field, and we calculate the rate of nucleation. Solutions describing magnetically charged st...
متن کاملPair creation of black holes joined by cosmic strings.
We argue that production of charged black hole pairs joined by a cosmic string in the presence of a magnetic field can be analyzed using the Ernst metric. The effect of the cosmic string is to pull the black holes towards each other, opposing to the background field. An estimation of the production rate using the Euclidean action shows that the process is suppressed as compared to the formation...
متن کاملStability of Z strings in strong magnetic fields.
We show that the Z strings of the standard electroweak theory can be stabilized by strong external magnetic fields, provided that P'1 = MH/Mz ~ 1, where Mtt and Mz are the Higgs and Z masses. The magnetic fields needed are larger than P'1 B, and smaller than B„where B, —= M ~/e is the critical magnetic field which causes W condensation in the usual broken phase vacuum. If such magnetic fields w...
متن کاملPair creation rate for U(1)2 black holes.
I consider a truncation of low-energy string theory which contains two U(1) gauge fields. After making some general comments on the theory, I describe a previously-obtained instanton for the pair creation of black holes when both gauge fields are non-zero, and obtain the pair creation rate by calculating its action. This calculation agrees qualitatively with the earlier calculation of the pair ...
متن کامل