The swampland conjecture and F-term axion monodromy inflation

Blumenhagen, Ralph; Valenzuela, Irene; Wolf, Florian

doi:10.1007/jhep07(2017)145

Cited by 119 publications

(153 citation statements)

References 72 publications

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“…Of course this is just a single example but a similar behavior has been found in all of the models studied in [45,47]. There, e.g.…”

Section: An Example With a D-brane Modulussupporting

confidence: 73%

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Quantum Gravity Constraints on Large Field Inflation

Blumenhagen¹

2018

Proceedings of Corfu Summer Institute 2017 "Schools and Workshops on Elementary Particle Physics and Gravity" — PoS(CORFU2017)

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Attempts to construct string derived effective field theory models realizing large field inflation are plagued by control issues. Targeted at a broader audience, in this article we review recent progress in isolating the underlying conceptual reasons for this failure. Special emphasis is given to models of axion monodromy inflation and their relation to the Swampland Distance Conjecture. This discriminates effective actions that admit a UV completion, the landscape, from those that do not, the swampland. Since they are conceptually very similar, we also comment on implied challenges for axionic quintessence models.

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“…Of course this is just a single example but a similar behavior has been found in all of the models studied in [45,47]. There, e.g.…”

Section: An Example With a D-brane Modulussupporting

confidence: 73%

“…In order to see whether this is possible in (quasi-) realistic set-ups, we consider a simple example from [45], that realizes many of the ingredients that we need.…”

Section: Inflationmentioning

confidence: 99%

Quantum Gravity Constraints on Large Field Inflation

Blumenhagen¹

2018

Proceedings of Corfu Summer Institute 2017 "Schools and Workshops on Elementary Particle Physics and Gravity" — PoS(CORFU2017)

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“…Here m φ is controlled by µ at leading order while m s by the fluxes entering in W 0 (see [20,21] for concrete examples). Therefore the critical proper field distance before the logarithmic scaling dominates…”

Section: D7-brane Position Modulimentioning

confidence: 99%

“…This in turn implies µ W 0 which is not possible for µ being a flux integer. Embedding the model in the Large Volume Scenario does not help, because the condition required to suppress backreaction becomes µ 1/V , which is not possible for large volume V either [21]. These difficulties can be traced back to the fact that we are trying to get the inflaton, which is stabilised at tree level by fluxes, lighter than the Kähler modulus, which is stabilised by non-perturbative effects.…”

Section: D7-brane Position Modulimentioning

confidence: 99%

“…The criterium is simple: everytime the inflaton potential can be set to zero without destabilising the rest of the scalars, the model enjoys the requirements to be able to delay the backreaction effects by generating a mass hierarchy between the inflaton and the other scalars [19,20]. However, a closer analysis reveals that, at least in flux toroidal compactifications, this mass hierarchy cannot be achieved without getting into trouble with the Kaluza-Klein scale and leaving the regime of validity of the effective theory [21], supporting this way the Refined Swampland Conjecure.…”

Section: Introductionmentioning

confidence: 99%

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Backreaction in Axion Monodromy, 4-forms and the Swampland

Valenzuela¹

2017

Proceedings of Corfu Summer Institute 2016 "School and Workshops on Elementary Particle Physics and Gravity" — PoS(CORFU2016)

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Axion monodromy models can always be described in terms of an axion coupled to 3-form gauge fields with non-canonical kinetic terms. The presence of the saxions parametrising the kinetic metrics of the 3-form fields leads to backreaction effects in the inflationary dynamics. We review the case in which saxions backreact on the Kähler metric of the inflaton leading to a logarithmic scaling of the proper field distance at large field. This behaviour is universal in Type II string flux compactifications and consistent with a refinement of the Swampland Conjecture. The critical point at which this behaviour appears depends on the mass hierarchy between the inflaton and the saxions. However, in tractable compactifications, such a hierarchy cannot be realised without leaving the regime of validity of the effective theory, disfavouring transplanckian excursions in string theory.

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A Tower Weak Gravity Conjecture from Infrared Consistency

Andriolo

Junghans

Noumi

et al. 2018

Fortschritte der Physik

147

166

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We analyze infrared consistency conditions of 3D and 4D effective field theories with massive scalars or fermions charged under multiple U (1) gauge fields. At low energies, one can integrate out the massive particles and thus obtain a one-loop effective action for the gauge fields. In the regime where charge-independent contributions to higher-derivative terms in the action are sufficiently small, it is then possible to derive constraints on the charge-to-mass ratios of the massive particles from requiring that photons propagate causally and have an analytic S-matrix. We thus find that the theories need to contain bifundamentals and satisfy a version of the weak gravity conjecture known as the convex-hull condition. Demanding self-consistency of the constraints under Kaluza-Klein compactification, we furthermore show that, for scalars, they imply a stronger version of the weak gravity conjecture in which the charge-to-mass ratios of an infinite tower of particles are bounded from below. We find that the tower must again include bifundamentals but does not necessarily have to occupy a charge (sub-)lattice.

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The swampland conjecture and F-term axion monodromy inflation

Cited by 119 publications

References 72 publications

Quantum Gravity Constraints on Large Field Inflation

Quantum Gravity Constraints on Large Field Inflation

Backreaction in Axion Monodromy, 4-forms and the Swampland

A Tower Weak Gravity Conjecture from Infrared Consistency

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