1995/06/30 by Jnanadeva Maharana, J. Maharana, H. Singh +1
Physics and Astronomy · #Action (physics) #Black Holes and Theoretical Physics #Constant (computer programming) #Cosmological constant #Cosmology and Gravitation Theories #Effective action #Euclidean geometry #Gravitation #Homogeneous space #Instanton #Noncommutative and Quantum Gravity Theories #String (physics) #hep-th
paper · pdf · doi:10.1016/0370-2693(95)01663-5
published as Phys.Lett.B368:64-70,1996 · 13 pages, RevTex file, text is improved, no changes in the final results, also some references are added. (version to appear in Phys. Lett. B)
arxiv created 1995/09/16 · openalex publication_date 1996/01/01 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Classical solutions for a four-dimensional Minkowskian string effective action and an Euclidean one with cosmological constant term are derived. The former corresponds to electrovac solutions whereas the later solutions are identified as gravitational instanton solutions for Fubini-Study metric. The symmetries of the effective actions are identified and new classical solutions are generated by implementing appropriate noncompact transformations. The S-duality transformations on the equations of motion are discussed and it is found that they are S-duality noninvariant due to the presence of cosmological constant term.