# Cosmological solutions in string theories

@article{Lu1997CosmologicalSI, title={Cosmological solutions in string theories}, author={H. Q. Lu and Sudipta Mukherji and C N Pope and K.-W. Xu}, journal={Physical Review D}, year={1997}, volume={55}, pages={7926-7935} }

We obtain a large class of cosmological solutions in the toroidally compactified low-energy limits of string theories in D dimensions. We consider solutions where a p-dimensional subset of the spatial coordinates, parametrizing a flat space, a sphere, or a hyperboloid, describes the spatial sections of the physically observed Universe. The equations of motion reduce to Liouville or SL(N+1,R) Toda equations, which are exactly solvable. We study some of the cases in detail, and find that under…

## 115 Citations

Resolution of cosmological singularities in string theory

- Physics
- 1997

We show that a class of (3+1)-dimensional Friedmann-Robertson-Walker cosmologies can be embedded within a variety of solutions of string theory. In some realizations, the apparent singularities…

M-theory resolution of four-dimensional cosmological singularities via U-duality

- Mathematics, Physics
- 1999

Dynamics of intersecting brane systems ? Classification and their applications

- Physics
- 2009

We present dynamical intersecting brane solutions in higher-dimensional gravitational theory coupled to dilaton and several forms. Assuming the forms of metric, form fields, and dilaton field, we…

Remarks on Tachyon Driven Cosmology

- Physics
- 2005

We begin by reviewing the results on the decay of unstable D-branes in type II string theory, and the open–closed string duality proposal that arises from these studies. We then apply this proposal…

Cosmological solutions, p -branes, and the Wheeler-DeWitt equation

- Physics
- 1998

The low energy effective actions which arise from string theory or M-theory are considered in the cosmological context, where the graviton, dilaton and antisymmetric tensor field strengths depend…

Accelerating universes in string theory via field redefinition

- Physics
- 2012

We study cosmological solutions in the effective heterotic string theory with α′-correction terms in the string frame. It is pointed out that the effective theory has an ambiguity via field…

Qualitative analysis of anisotropic and curved string cosmologies

- Physics
- 1999

A complete qualitative study of the dynamics of string cosmologies is presented for the class of isotopic curvature universes. These models are of Bianchi types I, V and IX and reduce to the general…

## References

SHOWING 1-10 OF 39 REFERENCES

Low energy effective string cosmology.

- PhysicsPhysical review. D, Particles and fields
- 1994

We give the general analytic solutions derived from the low energy string effective action for four-dimensional Friedmann-Robertson-Walker models with a dilaton and antisymmetric tensor field,…

Stringy Toda cosmologies

- Physics
- 1997

We discuss a particular stringy modular cosmology with two axion fields in seven space-time dimensions, decomposable as a time and two flat three-spaces. The effective equations of motion for the…

On the Cosmology and Symmetry of Dilaton-Axion Gravity

- Physics
- 1996

A global O$(2,2)$ symmetry is found in the Brans-Dicke theory of gravity when the dilaton is coupled to axion and moduli fields. The symmetry is broken if a cosmological constant is introduced.…

LIOUVILLE AND TODA SOLITONS IN M-THEORY

- Mathematics
- 1996

We study the general form of the equations for isotropic single-scalar, multi-scalar and dyonic p-branes in superstring theory and M-theory, and show that they can be cast into the form of Liouville,…