Can we measure the Rφ2 coupling parameter at tree-level scattering?

• Autor(a) principal: Accioly, A. J. [UNESP]
• Data de Publicação: 1995
• Outros Autores: Spehler, D. [UNESP], Novaes, S. F. [UNESP], Kwok, S. F. [UNESP], Mukai, H. [UNESP]
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://dx.doi.org/10.1103/PhysRevD.51.931; http://hdl.handle.net/11449/223873

The lowest order invariant amplitudes for the 2→2 processes concerning the action S[g,φ]=Fd4x -g [2R/κ2+1/2(gμν,μφ,νφ+λRφ2)] are computed. It is found that these results do not depend on the value of λ; therefore, it is impossible to measure the Rφ2 coupling parameter at tree-level scattering in this case. It is also shown that the theorydescribed by the above action is equivalent at the classical level to Einstein's theory with a massless minimally coupled scalar field provided that 1+λκ2φ2/4>0. Some consequences for cosmology and black holes are discussed. © 1995 The American Physical Society.