Membrane limits in quantum gravity

Álvarez-García, Rafael; Klaewer, Daniel; Weigand, Timo

doi:10.1103/physrevd.105.066024

“…It would be interesting to see if this is also the case for the hypermultiplet moduli space. If so, the string solutions should also capture the obstructions to reach certain points in the classical moduli space that were observed and analysed in [63][64][65] and play an important role in the realisation of the emergent string conjecture [66] for this case.…”

Section: Discussionmentioning

confidence: 94%

4d strings at strong coupling

Marchesano

¹

,

Wiesner

²

2022

J. High Energ. Phys.

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Weakly coupled regions of 4d EFTs coupled to gravity are particularly suitable to describe the backreaction of BPS fundamental axionic strings, dubbed EFT strings, in a local patch of spacetime around their core. We study the extension of these local solutions to global ones, which implies probing regions of strong coupling and provides an estimate of the EFT string tension therein. We conjecture that for the EFT string charge generators such a global extension is always possible and yields a sub-Planckian tension. We substantiate this claim by analysing global solutions of 4d strings made up from NS5-branes wrapping Calabi-Yau threefold divisors in either type IIA or heterotic string theory. We argue that in this case the global, non-perturbative data of the backreaction can be simply encoded in terms of a GLSM describing the compactification, as we demonstrate in explicit examples.

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“…It would be interesting to see if this is also the case for the hypermultiplet moduli space. If so, the string solutions should also capture the obstructions to reach certain points in the classical moduli space that were observed and analysed in [61][62][63] and play an important role in the realisation of the emergent string conjecture [64] for this case.…”

Section: Discussionmentioning

confidence: 94%

4d strings at strong coupling

Marchesano,

Wiesner

2022

Preprint

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Weakly coupled regions of 4d EFTs coupled to gravity are particularly suitable to describe the backreaction of BPS fundamental axionic strings, dubbed EFT strings, in a local patch of spacetime around their core. We study the extension of these local solutions to global ones, which implies probing regions of strong coupling and provides an estimate of the EFT string tension therein. We conjecture that for the EFT string charge generators such a global extension is always possible and yields a sub-Planckian tension. We substantiate this claim by analysing global solutions of 4d strings made up from NS5-branes wrapping Calabi-Yau threefold divisors in either type IIA or heterotic string theory. We argue that in this case the global, non-perturbative data of the backreaction can be simply encoded in terms of a GLSM describing the compactification, as we demonstrate in explicit examples.

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“…• The generators of the convex hull have length | ζ| = (d − 1)/(d − 2), which is the appropriate length for a tower of Kaluza-Klein modes for a decompactification to D = d + 1 dimensions. This is to be expected from the Emergent String Conjecture [7,8,21], which holds that every infinite-distance limit in moduli space is either an emergent string limit or a decompactification limit and suggests that each of the generator towers should correspond to either a tower of string oscillator modes or a Kaluza-Klein tower in some duality frame. In the case at hand, the winding modes are T-dual to the Kaluza-Klein modes.…”

Section: A Toy Model Of Dimensional Reductionmentioning

confidence: 97%

Asymptotic Scalar Field Cosmology in String Theory

Rudelius¹

2022

Preprint

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Asymptotic (late-time) cosmology depends on the asymptotic (infinite-distance) limits of scalar field space in string theory. Such limits feature an exponentially decaying potential V ∼ exp(−cφ) with corresponding Hubble scale H ∼ φ2 + 2V ∼ exp(−λ H φ), and at least one tower of particles whose masses scale as m ∼ exp(−λφ), as required by the Distance Conjecture. In this paper, we provide evidence that these coefficients satisfy the inequalities, where λ lightest is the λ coefficient of the lightest tower. This means that at late times, as the scalar field rolls to φ → ∞, the low-energy theory remains a d-dimensional FRW cosmology with decelerated expansion, the light towers of particles predicted by the Distance Conjecture remain at or above the Hubble scale, and both the strong energy condition and the dominant energy condition are satisfied.

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Membrane limits in quantum gravity

Cited by 15 publications

References 49 publications

4d strings at strong coupling

4d strings at strong coupling

4d strings at strong coupling

Asymptotic Scalar Field Cosmology in String Theory

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