The α′-complete cosmology developed by Hohm and Zwiebach classifies the O(d, d; ℝ) invariant theories involving metric, b-field and dilaton that only depend on time, to all orders in α′. Some of these theories feature non-perturbative isotropic de Sitter vacua in the string frame, generated by the infinite number of higher-derivatives of O(d, d; ℝ) multiplets. Extending the isotropic ansatz, we construct stable and unstable non-perturbative de Sitter solutions in the string and Einstein frames. The generalized equations of motion admit new solutions, including anisotropic d + 1-dimensional metrics and non-vanishing b-field. In particular, we find dSn+1× Td−n geometries with constant dilaton, and also metrics with bounded scale factors in th...
AbstractWe present a simple procedure to obtain a large class of different versions of the de Sitter...
A global O$(2,2)$ symmetry is found in the Brans-Dicke theory of gravity when the dilaton is coupled...
We compute the cosmological reduction of general string theories, including bosonic, heterotic, and ...
The cosmology of the fully $\alpha'$-corrected duality-invariant action for the Neveu-Schwarz sector...
© 2019 World Scientific Publishing Company. The higher-derivative α′ corrections consistent with O(d...
In this paper, we present two non-perturbative string cosmological solutions without curvature singu...
We revisit the classical theory of ten-dimensional two-derivative gravity coupled to fluxes, scalar ...
We revisit the classical theory of ten-dimensional two-derivative gravity coupled to fluxes, scalar ...
In this paper we provide the criteria for any generally covariant, parity preserving, and torsion-fr...
© 2019 authors. Published by the American Physical Society. Published by the American Physical Socie...
We review various aspects of de Sitter spacetime in string theory: its status as an effective field ...
This paper is devoted to a simple nonlocal de Sitter gravity model and its exact vacuum cosmological...
We examine to what extent perturbative α′-corrections can generate a small cosmological constant in ...
© 2015. We present a simple procedure to obtain a large class of different versions of the de Sitter...
We explore aspects of the physics of de Sitter (dS) space that are relevant to holography with a pos...
AbstractWe present a simple procedure to obtain a large class of different versions of the de Sitter...
A global O$(2,2)$ symmetry is found in the Brans-Dicke theory of gravity when the dilaton is coupled...
We compute the cosmological reduction of general string theories, including bosonic, heterotic, and ...
The cosmology of the fully $\alpha'$-corrected duality-invariant action for the Neveu-Schwarz sector...
© 2019 World Scientific Publishing Company. The higher-derivative α′ corrections consistent with O(d...
In this paper, we present two non-perturbative string cosmological solutions without curvature singu...
We revisit the classical theory of ten-dimensional two-derivative gravity coupled to fluxes, scalar ...
We revisit the classical theory of ten-dimensional two-derivative gravity coupled to fluxes, scalar ...
In this paper we provide the criteria for any generally covariant, parity preserving, and torsion-fr...
© 2019 authors. Published by the American Physical Society. Published by the American Physical Socie...
We review various aspects of de Sitter spacetime in string theory: its status as an effective field ...
This paper is devoted to a simple nonlocal de Sitter gravity model and its exact vacuum cosmological...
We examine to what extent perturbative α′-corrections can generate a small cosmological constant in ...
© 2015. We present a simple procedure to obtain a large class of different versions of the de Sitter...
We explore aspects of the physics of de Sitter (dS) space that are relevant to holography with a pos...
AbstractWe present a simple procedure to obtain a large class of different versions of the de Sitter...
A global O$(2,2)$ symmetry is found in the Brans-Dicke theory of gravity when the dilaton is coupled...
We compute the cosmological reduction of general string theories, including bosonic, heterotic, and ...