Axions in the landscape and string theory

Dine, Michael; Festuccia, Guido; Kehayias, John; Wu, Weitao

doi:10.1007/jhep01(2011)012

Cited by 29 publications

(31 citation statements)

References 29 publications

(62 reference statements)

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“…One explanation is that the QCD axion arises from the string theory axions, and is subject to the other moduli stabilization mechanism [33]. There appears a small number in the moduli stabilization, namely the ratio of the gravitino mass to the Planck scale, which could be extremely small if the SUSY persists to low-energy scales.…”

Section: Dark Mattermentioning

confidence: 99%

Low-scale supersymmetry from inflation

Nakayama

Takahashi

2011

J. Cosmol. Astropart. Phys.

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We investigate an inflation model with the inflaton being identified with a Higgs boson responsible for the breaking of U(1) B−L symmetry. We show that supersymmetry must remain a good symmetry at scales one order of magnitude below the inflation scale, in order for the inflation model to solve the horizon and flatness problems, as well as to account for the observed density perturbation. The upper bound on the soft supersymmetry breaking mass lies between 1 TeV and 10 3 TeV. Interestingly, our finding opens up a possibility that universes with the low-scale supersymmetry are realized by the inflationary selection. Our inflation model has rich implications; non-thermal leptogenesis naturally works, and the gravitino and moduli problems as well as the moduli destabilization problem can be solved or ameliorated; the standard-model higgs boson receives a sizable radiative correction if the supersymmertry breaking takes a value on the high side ∼ 10 3 TeV.

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Section: Dark Mattermentioning

confidence: 99%

Low-scale supersymmetry from inflation

Nakayama

Takahashi

2011

J. Cosmol. Astropart. Phys.

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“…, this periodicity implies that, for large s, in the superpotential the axion appears as e −A . Solving the strong CP problem then requires suppressing only a small number of possible terms [28,29]. As always, in string theory, one has to understand stabilization of moduli.…”

Section: Large Field Solutions Of the Strong Cp Problemmentioning

confidence: 99%

Light scalars and the cosmos: Nambu–Goldstone and otherwise

Dine

2016

Prog. Theor. Exp. Phys.

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This talk focuses on the role of light scalars in cosmology, both Nambu Goldstone bosons and pseudo moduli. The former include QCD axions, which might constitute the dark matter, and more general axions, which, under certain conditions, might play the role of inflatons, implementing natural inflation. The latter are the actors in (generalized) hybrid inflation. They rather naturally yield large field inflation, even mimicking chaotic inflation for suitable ranges of parameters.

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“…The size of terms in the effective action associated with these fields is controlled by the 2π periodicity of the axions. If we denote the full chiral axion superfield by A = s + ia, this periodicity implies that, for large s, in the superpotential the axion appears as e −nA for integer n. In constructing models which include supersymmetry breaking, solving the strong CP problem requires suppressing only a small number of possible terms [38,39].…”

Section: Small Field and Large Field Solutions To The Strong Cp Problemmentioning

confidence: 99%

Hybrid inflation with Planck scale fields

Dine

Stephenson-Haskins

2015

J. High Energ. Phys.

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Observable B-mode polarization in the CMBR would point to a high scale of inflation and large field excursions during the inflationary era. Non-compact string moduli spaces are a suggestive setting for these phenomena. Although they are unlikely to be described by weak coupling models, effective field theories compatible with known features of cosmology do exist. These models can be viewed as generalizations to a large field regime of hybrid inflation. We note close parallels to small and large field axion models. This paper outlines the requirements for successful modular inflation, and gives examples of effective field theories which satisfy them. The required tunings are readily characterized. These models can also be thought of as models of chaotic inflation, in a way we describe. In the modular framework, one would expect that any would-be Peccei-Quinn symmetry would likely be badly broken during inflation, and the axion would have Hubble scale mass; in this situation, isocurvature fluctuations would be suppressed and the initial misalignment angle would be fixed, rather than being a random variable.

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Axions in the landscape and string theory

Cited by 29 publications

References 29 publications

Low-scale supersymmetry from inflation

Low-scale supersymmetry from inflation

Light scalars and the cosmos: Nambu–Goldstone and otherwise

Hybrid inflation with Planck scale fields

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