English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/38838
Title: Dark energy from modified gravity with Lagrange multipliers
Authors: Capozziello, Salvatore; Matsumoto, Jiro; Nojiri, Shin'ichi; Odintsov, Sergei D.
Keywords: Dark energy
Modified gravity
Lagrange multiplier field
Issue Date: 27-Sep-2010
Publisher: Elsevier
Citation: Physics Letters - Section B 693 (2) : 198-208 (2010)
Abstract: We study scalar–tensor theory, k-essence and modified gravity with Lagrange multiplier constraint which role is to reduce the number of degrees of freedom. Dark Energy cosmology of different types (ΛCDM, unified inflation with DE, smooth non-phantom/phantom transition epoch) is reconstructed in such models. It is demonstrated that presence of Lagrange multiplier simplifies the reconstruction scenario. It is shown that mathematical equivalence between scalar theory and F(R) gravity is broken due to presence of constraint. The cosmological evolution is defined by the second F2(R) function dictated by the constraint. The convenient F(R) gravity sector is relevant for local tests. This opens the possibility to make originally non-realistic theory to be viable by adding the corresponding constraint. A general discussion on the role of Lagrange multipliers to make higher-derivative gravity canonical is developed.
Publisher version (URL): http://dx.doi.org/10.1016/j.physletb.2010.08.030
URI: http://hdl.handle.net/10261/38838
ISSN: 0370-2693
DOI: 10.1016/j.physletb.2010.08.030
E-ISSN: 1873-2445
Appears in Collections:(ICE) Artículos
Files in This Item:
File Description SizeFormat 
1004.3691v2.pdf229,49 kBAdobe PDFThumbnail
Show full item record

WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.