Cargando…

String-Inspired Higher-Curvature Terms and the Randall-Sundrum Scenario

We consider the O(a') string effective action, with Gauss-Bonnet curvature-squared and forth-order dilaton-derivative terms, which is derived by a matching procedure with string amplitudes in five space-time dimensions. We show that a non-factorizable metric of the Randall-Sundrum (RS) type, wi...

Descripción completa

Detalles Bibliográficos
Autores principales: Mavromatos, Nikolaos E, Rizos, J
Lenguaje:eng
Publicado: 2000
Materias:
Acceso en línea:https://dx.doi.org/10.1103/PhysRevD.62.124004
http://cds.cern.ch/record/450654
_version_ 1780896137677373440
author Mavromatos, Nikolaos E
Rizos, J
author_facet Mavromatos, Nikolaos E
Rizos, J
author_sort Mavromatos, Nikolaos E
collection CERN
description We consider the O(a') string effective action, with Gauss-Bonnet curvature-squared and forth-order dilaton-derivative terms, which is derived by a matching procedure with string amplitudes in five space-time dimensions. We show that a non-factorizable metric of the Randall-Sundrum (RS) type, with four-dimensional conformal factor Exp(-2 k|z|), can be a solution of the pertinent equations of motion. The parameter k is found proportional to the string coupling g_s and thus the solution appears to be non-perturbative. It is crucial that the Gauss-Bonnet combination has the right (positive in our conventions) sign, relative to the Einstein term, which is the case necessitated by compatibility with string (tree) amplitude computations. We study the general solution for the dilaton and metric functions, and thus construct the appropriate phase-space diagram in the solution space. In the case of an anti-de-Sitter bulk, we demonstrate that there exists a continuous interpolation between (part of) the RS solution at z=infinity and an (integrable) naked singularity at z=0. This implies the dynamical formation of domain walls (separated by an infinite distance), thus restricting the physical bulk space time to the positive z axis. Some brief comments on the possibility of fine-tuning the four-dimensional cosmological constant to zero are also presented.
id cern-450654
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2000
record_format invenio
spelling cern-4506542019-09-30T06:29:59Zdoi:10.1103/PhysRevD.62.124004http://cds.cern.ch/record/450654engMavromatos, Nikolaos ERizos, JString-Inspired Higher-Curvature Terms and the Randall-Sundrum ScenarioParticle Physics - TheoryWe consider the O(a') string effective action, with Gauss-Bonnet curvature-squared and forth-order dilaton-derivative terms, which is derived by a matching procedure with string amplitudes in five space-time dimensions. We show that a non-factorizable metric of the Randall-Sundrum (RS) type, with four-dimensional conformal factor Exp(-2 k|z|), can be a solution of the pertinent equations of motion. The parameter k is found proportional to the string coupling g_s and thus the solution appears to be non-perturbative. It is crucial that the Gauss-Bonnet combination has the right (positive in our conventions) sign, relative to the Einstein term, which is the case necessitated by compatibility with string (tree) amplitude computations. We study the general solution for the dilaton and metric functions, and thus construct the appropriate phase-space diagram in the solution space. In the case of an anti-de-Sitter bulk, we demonstrate that there exists a continuous interpolation between (part of) the RS solution at z=infinity and an (integrable) naked singularity at z=0. This implies the dynamical formation of domain walls (separated by an infinite distance), thus restricting the physical bulk space time to the positive z axis. Some brief comments on the possibility of fine-tuning the four-dimensional cosmological constant to zero are also presented.hep-th/0008074CERN-TH-2000-234oai:cds.cern.ch:4506542000-08-08
spellingShingle Particle Physics - Theory
Mavromatos, Nikolaos E
Rizos, J
String-Inspired Higher-Curvature Terms and the Randall-Sundrum Scenario
title String-Inspired Higher-Curvature Terms and the Randall-Sundrum Scenario
title_full String-Inspired Higher-Curvature Terms and the Randall-Sundrum Scenario
title_fullStr String-Inspired Higher-Curvature Terms and the Randall-Sundrum Scenario
title_full_unstemmed String-Inspired Higher-Curvature Terms and the Randall-Sundrum Scenario
title_short String-Inspired Higher-Curvature Terms and the Randall-Sundrum Scenario
title_sort string-inspired higher-curvature terms and the randall-sundrum scenario
topic Particle Physics - Theory
url https://dx.doi.org/10.1103/PhysRevD.62.124004
http://cds.cern.ch/record/450654
work_keys_str_mv AT mavromatosnikolaose stringinspiredhighercurvaturetermsandtherandallsundrumscenario
AT rizosj stringinspiredhighercurvaturetermsandtherandallsundrumscenario