Starobinsky-like inflation in dilaton-brane cosmology

John Ellis; Nick E. Mavromatos; Dimitri V. Nanopoulos

doi:10.1016/j.physletb.2014.04.014

Starobinsky-like inflation in dilaton-brane cosmology

John Ellis, Nick E. Mavromatos^*, Dimitri V. Nanopoulos

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

31 Citations (Scopus)

Abstract

We discuss how Starobinsky-like inflation may emerge from dilaton dynamics in brane cosmology scenarios based on string theory, in which our universe is represented as a three-brane. The effective potential may acquire a constant term from a density of effectively point-like non-pertubative defects on the brane. Higher-genus corrections generate corrections to the effective potential that are exponentially damped at large field values, as in the Starobinsky model, but at a faster rate, leading to a smaller prediction for the tensor-to-scalar perturbation ratio r. This may be compensated partially by logarithmic deformations on the world-sheet due to recoil of the defects due to scattering by string matter on the brane, which tend to enhance the tensor-to-scalar ratio. Quantum fluctuations of the ensemble of D-brane defects during the inflationary period may also enhance the tensor-to-scalar ratio.

Original language	English
Pages (from-to)	380-384
Number of pages	5
Journal	Physics Letters B
Volume	732
DOIs	https://doi.org/10.1016/j.physletb.2014.04.014
Publication status	Published - 1 May 2014

Keywords

STRING THEORY
LOGARITHMIC OPERATORS
GRAVITY
RECOIL
LIGHT

Access to Document

10.1016/j.physletb.2014.04.014

Cite this

@article{e8b58193edb747768e92d7e7fb444426,

title = "Starobinsky-like inflation in dilaton-brane cosmology",

abstract = "We discuss how Starobinsky-like inflation may emerge from dilaton dynamics in brane cosmology scenarios based on string theory, in which our universe is represented as a three-brane. The effective potential may acquire a constant term from a density of effectively point-like non-pertubative defects on the brane. Higher-genus corrections generate corrections to the effective potential that are exponentially damped at large field values, as in the Starobinsky model, but at a faster rate, leading to a smaller prediction for the tensor-to-scalar perturbation ratio r. This may be compensated partially by logarithmic deformations on the world-sheet due to recoil of the defects due to scattering by string matter on the brane, which tend to enhance the tensor-to-scalar ratio. Quantum fluctuations of the ensemble of D-brane defects during the inflationary period may also enhance the tensor-to-scalar ratio.",

keywords = "STRING THEORY, LOGARITHMIC OPERATORS, GRAVITY, RECOIL, LIGHT",

author = "John Ellis and Mavromatos, {Nick E.} and Nanopoulos, {Dimitri V.}",

year = "2014",

month = may,

day = "1",

doi = "10.1016/j.physletb.2014.04.014",

language = "English",

volume = "732",

pages = "380--384",

journal = "Physics Letters B",

issn = "0370-2693",

publisher = "Elsevier",

}

TY - JOUR

T1 - Starobinsky-like inflation in dilaton-brane cosmology

AU - Ellis, John

AU - Mavromatos, Nick E.

AU - Nanopoulos, Dimitri V.

PY - 2014/5/1

Y1 - 2014/5/1

N2 - We discuss how Starobinsky-like inflation may emerge from dilaton dynamics in brane cosmology scenarios based on string theory, in which our universe is represented as a three-brane. The effective potential may acquire a constant term from a density of effectively point-like non-pertubative defects on the brane. Higher-genus corrections generate corrections to the effective potential that are exponentially damped at large field values, as in the Starobinsky model, but at a faster rate, leading to a smaller prediction for the tensor-to-scalar perturbation ratio r. This may be compensated partially by logarithmic deformations on the world-sheet due to recoil of the defects due to scattering by string matter on the brane, which tend to enhance the tensor-to-scalar ratio. Quantum fluctuations of the ensemble of D-brane defects during the inflationary period may also enhance the tensor-to-scalar ratio.

AB - We discuss how Starobinsky-like inflation may emerge from dilaton dynamics in brane cosmology scenarios based on string theory, in which our universe is represented as a three-brane. The effective potential may acquire a constant term from a density of effectively point-like non-pertubative defects on the brane. Higher-genus corrections generate corrections to the effective potential that are exponentially damped at large field values, as in the Starobinsky model, but at a faster rate, leading to a smaller prediction for the tensor-to-scalar perturbation ratio r. This may be compensated partially by logarithmic deformations on the world-sheet due to recoil of the defects due to scattering by string matter on the brane, which tend to enhance the tensor-to-scalar ratio. Quantum fluctuations of the ensemble of D-brane defects during the inflationary period may also enhance the tensor-to-scalar ratio.

KW - STRING THEORY

KW - LOGARITHMIC OPERATORS

KW - GRAVITY

KW - RECOIL

KW - LIGHT

U2 - 10.1016/j.physletb.2014.04.014

DO - 10.1016/j.physletb.2014.04.014

M3 - Article

SN - 0370-2693

VL - 732

SP - 380

EP - 384

JO - Physics Letters B

JF - Physics Letters B

ER -

Starobinsky-like inflation in dilaton-brane cosmology

Abstract

Keywords

Access to Document

Fingerprint

Cite this