Please use this identifier to cite or link to this item: https://hdl.handle.net/20.500.14279/14220
Title: Higher-order logarithmic conformal algebras from Robertson-Walker σ-model backgrounds
Authors: Mavromatos, Nick E. 
Gravanis, Elias 
Major Field of Science: Engineering and Technology
Field Category: Civil Engineering
Keywords: Conformal Field Models in String Theory;D-branes;Sigma Models
Issue Date: 1-Jun-2002
Source: Journal of High Energy Physics, 2002, vol. 6, no. 6, pp. 357-375
Volume: 6
Issue: 6
Start page: 357
End page: 375
Journal: Journal of High Energy Physics 
Abstract: We demonstrate that an impulse action ('recoil') on a D-particle embedded in a (four-dimensional) cosmological Robertson-Walker (RW) spacetime is described, in a σ-model framework, by a suitably extended higher-order logarithmic world-sheet algebra of relevant deformations. We study in some detail the algebra of the appropriate two-point correlators, and discuss how can one approach the world-sheet renormalization group infrared fixed point, in the neighborhood of which the logarithmic algebra is valid. Interestingly enough it is found that, if the initial RW spacetime does not have cosmological horizons, then one can define a standard logarithmic algebra to describe the fixed point. However, in the presence of horizons, there are world-sheet divergences, due to relevant operators, which result in the presence of higher-order logarithmic algebras. © SISSA/ISAS 2002.
ISSN: 10298479
Type: Article
Affiliation : King's College London 
Publication Type: Peer Reviewed
Appears in Collections:Άρθρα/Articles

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