منابع مشابه
Magnetic Strings in Dilaton Gravity
First, I present two new classes of magnetic rotating solutions in four-dimensional Einstein-Maxwell-dilaton gravity with Liouville-type potential. The first class of solutions yields a 4-dimensional spacetime with a longitudinal magnetic field generated by a static or spinning magnetic string. I find that these solutions have no curvature singularity and no horizons, but have a conic geometry....
متن کاملCosmic Strings and the String Dilaton
The existence of a dilaton (or moduli) with gravitational-strength coupling to matter imposes stringent constraints on the allowed energy scale of cosmic strings, η. In particular, superheavy gauge strings with η ∼ 1016 GeV are ruled out unless the dilaton mass mφ ∼ 100TeV, while the currently popular value mφ ∼ 1TeV imposes the bound η ∼ 3×10 11 GeV. Similar constraints are obtained for global...
متن کاملSupermassive screwed cosmic string in dilaton gravity
The early Universe might have undergone phase transitions at energy scales much higher than the one corresponding to the Grand Unified Theories (GUT) scales. Then, at these higher energy scales, the transition at which gravity separated from all other interactions, the Planck era, more massive strings called supermassive cosmic strings, could be produced, with energy of about 10GeV . The dynami...
متن کاملCosmic censorship in 2-dimensional dilaton gravity
Abstract. The global structure of 2-dimensional dilaton gravity is studied, attending in particular to black holes and singularities. A gravitational energy is defined and shown to be positive at spatial singularities and negative at temporal singularities. Trapped points are defined, and it is shown that spatial singularities are trapped and temporal singularities are not. Thus a local form of...
متن کاملCosmic strings in axionic-dilatonic gravity
We first consider local cosmic strings in dilaton-axion gravity and show that they are singular solutions. Then we take a supermassive Higgs limit and present expressions for the fields at far distances from the core by applying a Pecci-Quinn and a duality transformation to the dilatonic Melvin’s magnetic universe. PACS numbers: 04.70.-b, 11.27.+d
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ژورنال
عنوان ژورنال: Physical Review D
سال: 1997
ISSN: 0556-2821,1089-4918
DOI: 10.1103/physrevd.56.1194