Axion inflation in type II string theory
By Thomas W. Grimm. 2007
156 citations recorded by the source corpus.
Inflationary models driven by a large number of axion fields are discussed in the context of type IIB compactifications with N = 1 supersymmetry. The inflatons arise as the scalar modes of the R-R two-forms evaluated on vanishing two-cycles in the compact geometry. The vanishing cycles are resolved by small two-volumes or NS-NS B fields which sit together with the inflatons in the same supermultiplets. String world sheets wrapping the vanishing cycles correct the metric of the R-R inflatons. They can help to generate kinetic terms close to the Planck scale and a mass hierarchy between the axions and their nonaxionic partners during inflation. At small string coupling, D-brane corrections are subleading in the metric of the R-R inflatons. However, an axion potential can be generated by D1 instantons or gaugino condensates on D5-branes. Models with a sufficiently large number of axions admit regions of chaotic inflation which can stretch over the whole axion field range for potentials from gaugino condensates. These models could allow for a possibly detectable amount of gravitational waves with tensor to scalar ratio as high as r < 0.14.
Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/59dad31e2eb528439201db6daf86cff87e7070a9
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Citations in the corpus
- The powers of monodromy (2014, unknown): “In this section we explain the origin of terms in the effective action that have a monodromyinduced potential growing as an integer power p0 ≥ 2 of an axion field, while also depending (2)Other interesting recent work on axion inflation in string theory without incorporating monodromy appears in [19”
- On the possibility of large axion moduli spaces (2014, background): “We then explain why positivity of the κijk must indeed hold, as was argued in [27].”
- Inflationary Constraints on Type IIA String Theory (2007, background): “driven by closed string moduli [16, 17, 18, 19, 20], axions [21, 22, 23, 24, 25 ], or brane positions [26, 27, 28, 29, 30, 31, 32, 33] in the extra dimensions.”
- Transplanckian axions!? (2015, background): “However, the Planck mass will also receive quantum corrections from diagrams involving the N axions running in the internal loops, so MP will grow as √ N , cancelling the Pythagorean enhancement from travelling along the diagonal [9,28].”
- Towards universal axion inflation and reheating in string theory (2014, background): “It turns out that realizing N-flation in a concrete stringtheory model is not an easy task [13, 14].”
- Inflation and String Theory (2014, background): “One advantage of the model of [735] is that it is comparatively straightforward to arrange that the Kähler moduli masses are larger than the inflaton mass.”
- Constraints on axion inflation from the weak gravity conjecture (2015, background): “The metric on field space is given by [32],”
- Phenomenology of a pseudo-scalar inflaton: naturally large nongaussianity (2011, unknown): “See also [55] for an alternative construction.”
- F-term axion monodromy inflation (2014, background): “The first class of ideas involves multiple axions in an intricate way [11–14], while the second can be implemented with a single axion if there is a non-trivial monodromy in field space [15,16].”
- The landscape of QCD axion models (2020, background): “9) are axion inflation [738–741] where the inflationary potential is given by the standard cosine potential, and axion monodromy [742–744], in which the potential includes extra terms like a linear term.”