Non-linear stability of α′-corrected Friedmann equations

Bernardo, Heliudson; Chojnacki, Jan; Comeau, Vincent

doi:10.1007/jhep03(2023)119

Cited by 3 publications

(1 citation statement)

References 41 publications

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“…In [158,163] solutions of the equations of motion of DFT cosmology from [153,154] coupled to matter obeying the T-duality symmetry were analyzed., and their stability was studied [163]. 6 In [159] (see also [167,168]) it was shown that the formalism of [153,154] (including matter) can be generalized to an anisotropic setting. In particular, we can consider a setup in which matter is initially dominated by winding modes about all spatial dimensions and then undergoes a phase transition in which the winding modes about three (external) dimensions decay into radiation while those about the other six (internal) dimensions persist, as argued to be the case in String Gas Cosmology.…”

Section: Jcap11(2023)019mentioning

confidence: 99%

Superstring cosmology — a complementary review

Brandenberger

2023

J. Cosmol. Astropart. Phys.

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In this review, a number of approaches to superstring cosmology which make use of key features which distinguish string theory from point particle theories are discussed, with particular emphasis on emergent scenarios. One motivation for the discussion is the realization that, in order to describe the evolution of the very early universe, it is necessary to go beyond a conventional effective field theory (EFT) analysis. Some of the conceptual problems of an EFT analysis will be discussed. The review begins with a summary of the criteria for a successful early universe scenario, emphasizing that cosmic inflation is not the only scenario of early universe cosmology which is consistent with current cosmological observations. Bouncing and emergent scenarios as interesting alternatives are introduced. Some realizations of these scenarios from superstring theory are reviewed, e.g. String Gas Cosmology, the Pre-Big-Bang scenario, the Ekpyrotic model, Double Field Theory cosmology and matrix model cosmology. In light of the difficulties in obtaining cosmic inflation from string theory (at the level of EFT), and realizing that there are promising examples of alternative early universe scenarios which are derived from basic principles of superstring theory, one must entertain the possibility that the cosmology emerging from string theory will not involve an extended period of accelerated expansion.

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Section: Jcap11(2023)019mentioning

confidence: 99%

Superstring cosmology — a complementary review

Brandenberger

2023

J. Cosmol. Astropart. Phys.

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O(D,D) -covariant formulation of perfect and imperfect fluids in the double geometry

Lescano,

Mirón-Granese,

Sakatani

2024

Phys. Rev. D

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Stability analysis of the cosmological dynamics of O(D, D)-complete stringy gravity

Arapoğlu,

Çağan,

Çatal-Özer

2024

Eur. Phys. J. C

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The massless fields in the universal NS-NS sector of string theory form O(D, D) multiplets of Double Field Theory, which is a theory that provides a T-duality covariant formulation of supergravity, leading to a stringy modification of General Relativity. In this framework, it is possible to write down the extensions of the Einstein field equations and the Friedmann equations in such a way that the coupling of gravitational and matter sectors is dictated by the O(D, D) symmetry universally. In this paper, we obtain the autonomous form of the O(D, D)-complete Friedmann equations, find the critical points and perform their stability analysis. We also include the phase portraits of the system. Cosmologically interesting cases of scalar field, radiation, and matter are separately considered and compared with the Chameleon models in a similar setting. Accelerating phases and the conditions for their existence are also given for such cases.

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Non-linear stability of α′-corrected Friedmann equations

Cited by 3 publications

References 41 publications

Superstring cosmology — a complementary review

Superstring cosmology — a complementary review

O(D,D) -covariant formulation of perfect and imperfect fluids in the double geometry

Stability analysis of the cosmological dynamics of O(D, D)-complete stringy gravity

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