Roulette inflation with kähler moduli and their axions
By J. Richard Bond, Lev Kofman, Sergey F. Prokushkin, P. Vaudrevange. 2006
133 citations recorded by the source corpus.
We study 2-field inflation models based on the 'large-volume' flux compactification of type IIB string theory. The role of the inflaton is played by a Kaehler modulus {tau} corresponding to a 4-cycle volume and its axionic partner {theta}. The freedom associated with the choice of Calabi-Yau manifold and the nonperturbative effects defining the potential V({tau},{theta}) and kinetic parameters of the moduli brings an unavoidable statistical element to theory prior probabilities within the low-energy landscape. The further randomness of ({tau},{theta}) initial conditions allows for a large ensemble of trajectories. Features in the ensemble of histories include 'roulette trajectories', with long-lasting inflations in the direction of the rolling axion, enhanced in the number of e-foldings over those restricted to lie in the {tau}-trough. Asymptotic flatness of the potential makes possible an eternal stochastic self-reproducing inflation. A wide variety of potentials and inflaton trajectories agree with the cosmic microwave background and large scale structure data. In particular, the observed scalar tilt with weak or no running can be achieved in spite of a nearly critical de Sitter deceleration parameter and consequently a low gravity wave power relative to the scalar curvature power.
Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/f8ffe9e590fa11803c5e573cbe15c599fe9e91fa
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Citations in the corpus
- Axion inflation in type II string theory (2007, background): “Specific scenarios include realizations of Kähler moduli inflation [7, 8], racetrack models [9] and the most intensively studied possibility of D-brane inflation [10, 5].”
- Jumping Through Loops: On Soft Terms from Large Volume Compactifications (2007, background): “In LVS, work has been done on soft supersymmetry breaking [4, 6, 7], the QCD axion [8, 9], neutrino masses [10], inflation [11, 12, 13, 14], and even first attempts at LHC phenomenology [15].”
- Inflation and String Theory (2014, background): “73 The axionic partner θφ of the inflaton τφ is not necessarily stabilized, and allowing θφ to have a nonvanishing initial velocity leads to the rich dynamics known as roulette inflation [784].”
- Towards an explicit model of D-brane inflation (2007, background): “the second reference in [7]), a particular term in the Kähler potential that could give ∆η ∼ 1 has not yet been computed (though it has been conjectured that this term might vanish.”
- Simple exercises to flatten your potential (2010, background): “would like to thank the KITP at UC Santa Barbara for their warm hospitality during the “Strings at the LHC and in It would also be interesting to study backreaction further in models where a cycle size modulus plays the role of the inflaton such as [41] or [42].”
- Explicit de Sitter flux vacua for global string models with chiral matter (2013, background): “These are the right features to realise different promising models where the inflaton is a Kähler modulus [86–89].”
- Review of local non-Gaussianity from multi-field inflation (2010, background): “A potential with a similar form may be motivated in string theory, in the context of Kähler moduli inflation [118–125].”
- Monodromy in the CMB: Gravity Waves and String Inflation (2008, background): “Given that, the (fractional) power law potential yields predictions for the tilt ns − 1 of the spectrum of density perturbations, and Axions can play an important role in small-field string theoretic inflation as well; see [13] for an interesting recent example based partly on [14].”
- Inflationary Constraints on Type IIA String Theory (2007, background): “For this reason, the past few years have seen intense investigation into the possibility of inflation driven by closed string moduli [16, 17, 18, 19, 20], axions [21, 22, 23, 24, 25], or D-brane positions [26, 27, 28, 29, 30, 31] in the extra dimensions.”
- Phenomenology of a pseudo-scalar inflaton: naturally large nongaussianity (2011, background): “For example, roulette inflation [69] – which generalizes [70] to incorporate the dynamics of the axionic partner of the Kahler modulus – is characterized by significant motion in the axion direction during the early stages of inflation.”