Kalb-Ramond backgrounds in α′-complete cosmology

Bernardo, Heliudson; Chouha, Paul-Robert; Franzmann, Guilherme

doi:10.1007/jhep09(2021)109

Cited by 8 publications

(7 citation statements)

References 33 publications

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“…For the case of an isotropic FLRW Universe the HZ action depends on just a single even function F (H) of the Hubble parameter H(t). Further developments of the HZ approach have been given in several subsequent papers [12][13][14][15][16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

From the string vacuum to FLRW or de Sitter via α' corrections

Conzinu,

Fanizza,

Gasperini

et al. 2023

J. Cosmol. Astropart. Phys.

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We first make more precise a recent “Hamiltonian” reformulation of the Hohm-Zwiebach approach to the tree-level, O(d,d)-invariant string cosmology equations at all orders in the α' expansion, and recall how it allows to give a simple characterization of a large class of cosmological scenarios connecting, through a non-singular bounce, two duality-related perturbative solutions at early and late times. We then discuss the effects of adding to the action a non-perturbative, O(d,d)-breaking, dilaton potential V(ϕ). The resulting cosmological solutions, assumed to approach at early times the perturbative string vacuum (with vanishing curvature and string coupling), can stabilize the dilaton at late times and simultaneously approach either a matter-dominated FLRW cosmology or a de-Sitter-like inflationary phase, depending on initial conditions and on the properties of V(ϕ) at moderate-coupling. We also identify a general mechanism for generating isotropic late-time attractors from a large basin of anisotropic initial conditions.

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Section: Introductionmentioning

confidence: 99%

From the string vacuum to FLRW or de Sitter via α' corrections

Conzinu,

Fanizza,

Gasperini

et al. 2023

J. Cosmol. Astropart. Phys.

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“…• Exploring the incorporation of the Kalb-Ramond field [23] is also an interested direction. For instance, the BTZ black hole solution in string theory requires a non-vanishing Kalb-Ramond field.…”

Section: Discussionmentioning

confidence: 99%

“…The previous discussion about Kalb-Ramond field in Hohm-Zwiebach action can be found in a ref. [19]. To demonstrate the difficulty including Kalb-Ramond field, let us recall the Hohm-Zwiebach action for the black hole background:…”

Section: Introductionmentioning

confidence: 99%

Three dimensional regular black string via loop corrections

Ying

2023

J. High Energ. Phys.

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It is well known that some spacetime singularities of low energy effective action can be resolved by the effective loop corrections. However, the known potentials for the loop corrections fail to regulate the singularity of three dimensional black string. An alternative method is to introduce an extra flat spatial direction and boost away the singularity by using the O(d, d) rotation with the special Kalb-Ramond field. In this paper, we investigate a new set of non-local dilaton potentials for the effective loop corrections. The result shows that the singularity of three dimensional black string can be consistently resolved by the loop corrections.

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“…Aside from cases where the leading contribution vanishes, one can expect that couplings of this type be required to all orders, at least in α , in order to circumvent a Dine-Seiberg-like argument [121]. Some progress along these lines has been achieved via all-order string-amplitude computations (see, e.g., [122,123]) and via T-duality in the context of cosmology [124][125][126][127][128][129][130][131][132][133]. Furthermore, from the perspective of holography, it would be interesting to understand whether the IR fixed-point structure exhibited by the JHEP10(2021)080 near-horizon AdS throats discussed in section 3 can be reproduced via strong-coupling effects in the putative dual gauge theory.…”

Section: Discussionmentioning

confidence: 99%

Supersymmetry breaking, brane dynamics and Swampland conjectures

Basile

2021

J. High Energ. Phys.

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We investigate interactions between branes of various dimensions, both charged and uncharged, in three non-supersymmetric string models. These include the USp(32) and U(32) orientifold projections of the type IIB and type 0B strings, as well as the SO(16)×SO(16) projection of the exceptional heterotic string. The resulting ten-dimensional spectra are free of tachyons, and the combinations of branes that they contain give rise to rich and varied dynamics. We compute static potentials for parallel stacks of branes in three complementary regimes: the probe regime, in which one of the two stacks is parametrically heavier than the other, the string-amplitude regime, in which both stacks are light, and the holographic regime. Whenever comparisons are possible, we find qualitative agreement despite the absence of supersymmetry. For charged branes, our analysis reveals that the Weak Gravity Conjecture is satisfied in a novel way via a renormalization of the effective charge-to-tension ratio.

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Kalb-Ramond backgrounds in α′-complete cosmology

Cited by 8 publications

References 33 publications

From the string vacuum to FLRW or de Sitter via α' corrections

From the string vacuum to FLRW or de Sitter via α' corrections

Three dimensional regular black string via loop corrections

Supersymmetry breaking, brane dynamics and Swampland conjectures

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