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New model of axion monodromy inflation and its cosmological implications
High Energy Physics - Theory · Submitted 14 Dec 2014
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim Thus our model provides an interpretation for the low-$\ell$ suppression of temperature anisotropies in the CMB power spectrum.
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We propose a new realization of axion monodromy inflation in which axion monodromy arises from torsional cycles in a type IIB compactification. A class of monomial potentials is obtained with specific values for the power index. Moreover, the inflaton mass changes profile due to the couplings between various fields after compactification. Consequently, the potential obtains a step-like profile at some critical scale. We study the cosmological implications of one concrete realization of this model. At the background level, it realizes a sufficiently long inflationary stage, which allows for the violation of the slow-roll conditions for a short period of time when the inflaton is close to the critical scale. Accordingly, the Hubble horizon is perturbed and affects the dynamics of primordial cosmological perturbations. In particular, we analyze the angular power spectrum of B-mode polarization and find a boost on very large scales. We also find that the amplitude of scalar perturbations is suppressed near the critical scale. Thus our model provides an interpretation for the low-$\ell$ suppression of temperature anisotropies in the CMB power spectrum. We examine these effects and confront the model to observations.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | We propose a new realization of axion monodromy inflation in which axion monodromy arises from torsional cycles in a type IIB compactification. | contribution 0.99 | 0.92 | 0.09 | asserted 0.94 |
| s1 | A class of monomial potentials is obtained with specific values for the power index. | result 0.64 | 0.88 | 0.05 | asserted 1.00 |
| s2 | Moreover, the inflaton mass changes profile due to the couplings between various fields after compactification. | result 0.57 | 0.62 | 0.04 | asserted 1.00 |
| s3 | Consequently, the potential obtains a step-like profile at some critical scale. | result 0.77 | 0.78 | 0.08 | asserted 1.00 |
| s4 | We study the cosmological implications of one concrete realization of this model. | contribution 0.98 | 0.92 | 0.05 | asserted 0.89 |
| s5 | At the background level, it realizes a sufficiently long inflationary stage, which allows for the violation of the slow-roll conditions for a short period of time when the inflaton is close to the critical scale. | result 0.94 | 0.76 | 0.12 | asserted 1.00 |
| s6 | Accordingly, the Hubble horizon is perturbed and affects the dynamics of primordial cosmological perturbations. | result 0.51 | 0.54 | 0.05 | asserted 1.00 |
| s7 | In particular, we analyze the angular power spectrum of B-mode polarization and find a boost on very large scales. | result 0.95 | 0.96 | 0.17 | asserted 1.00 |
| s8 | We also find that the amplitude of scalar perturbations is suppressed near the critical scale. | result 1.00 | 0.97 | 0.11 | asserted 1.00 |
| s9 | Thus our model provides an interpretation for the low-$\ell$ suppression of temperature anisotropies in the CMB power spectrum. | interpretation 1.00 | 0.83 | 0.52 | asserted 0.94 |
| s10 | We examine these effects and confront the model to observations. | contribution 0.85 | 0.90 | 0.06 | asserted 0.62 |
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The paper
Original abstract
We propose a new realization of axion monodromy inflation in which axion monodromy arises from torsional cycles in a type IIB compactification. A class of monomial potentials is obtained with specific values for the power index. Moreover, the inflaton mass changes profile due to the couplings between various fields after compactification. Consequently, the potential obtains a step-like profile at some critical scale. We study the cosmological implications of one concrete realization of this model. At the background level, it realizes a sufficiently long inflationary stage, which allows for the violation of the slow-roll conditions for a short period of time when the inflaton is close to the critical scale. Accordingly, the Hubble horizon is perturbed and affects the dynamics of primordial cosmological perturbations. In particular, we analyze the angular power spectrum of B-mode polarization and find a boost on very large scales. We also find that the amplitude of scalar perturbations is suppressed near the critical scale. Thus our model provides an interpretation for the low-$\ell$ suppression of temperature anisotropies in the CMB power spectrum. We examine these effects and confront the model to observations.
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References
How the literature uses it
17 arXiv papers cite this in 27 sentences
Papers citing it · 19 sentences without a confident label
Cites it as support 1 paper
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As shown in [ref] a Kähler manifold admitting torsion is a suitable example in which $F_5$ contributes to $$.
Metastable vacua from torsion and machine learning · Conclusions and Final comments · 0.99
Cites it as background 7 papers
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This model and its extensions have drawn a lot of attention in the literature (e.g., see [ref] and references therein).
Searching for features of a string-inspired inflationary model with cosmological observations · Introduction · 0.95
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In particular it was suggested in [ref] that the addition of a transient fast-roll phase preceding the slow-roll would lead to power suppression and the idea was further developed in [ref] , e.g., by modifying the inflaton potential, or by simply postulating an appropriate fast-roll phase.
Quantum Gravity in the Sky: Interplay between fundamental theory and observations · Summary and outlook · 0.86
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Some four-dimensional examples with a possible ten-dimensional origin can be found in [ref] , while some more ten-dimensional mechanisms with possible compactifications are given in [ref] .
A no-go theorem for monodromy inflation · Introduction · 0.85
What it cites · 23 sentences without a confident label
Uses the method or tool of 5 papers
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We now propose a procedure à la KKLT [ref] in order to stabilize the complex structure, dilaton, and Kähler moduli in a two-step procedure.
Inflation and String Theory · General details of the construction · 0.94
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More specifically, we use the recently developed [ web page: .] [ref] .
Bayesian Analysis of Inflation: Parameter Estimation for Single Field Models · Perturbation analysis · 0.99
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More specifically, we use the recently developed [ web page: .] [ref] .
Bayesian Analysis of Inflation II: Model Selection and Constraints on Reheating · Perturbation analysis · 0.99
Uses data or values from 1 paper
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Furthermore, we use the best fit to the cosmological parameters found by Planck [ref] in the code.
Planck 2013 results. XVI. Cosmological parameters · Perturbation analysis · 0.97
Cites as background 53 papers
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The idea of axion monodromy inflation originally proposed in [ref] has provided an interesting interpretation that a sufficiently long period of inflation can persist through many cycles of the axion period while the inflaton's potential is well controlled by the axion shift symmetry.
Monodromy in the CMB: Gravity Waves and String Inflation · A brief review of existing axion monodromy models · 0.97
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Thus, it is convenient to parameterize these theories in terms of an exponent $p$: [equation] For example, a model with $p=2/3$ was obtained in [ref] based on a construction of Nil manifolds; the case of $p=2$ was found after taking into account an appropriate coupling of the axion to a four-form field [ref] ; more examples with $p=2/3$, $4/3$, $2$ and $3$ were obtained in [ref] by considering effective couplings of the NS-NS $B_2$ field to the RR $F_1$ field through $|F̃_5|^2$ and $|F̃_3|^2$, respectively, after reducing type IIB on a circle with specific background fluxes and moduli stabilization.
The Powers of Monodromy · A brief review of existing axion monodromy models · 1.00
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Thus, it is convenient to parameterize these theories in terms of an exponent $p$: [equation] For example, a model with $p=2/3$ was obtained in [ref] based on a construction of Nil manifolds; the case of $p=2$ was found after taking into account an appropriate coupling of the axion to a four-form field [ref] ; more examples with $p=2/3$, $4/3$, $2$ and $3$ were obtained in [ref] by considering effective couplings of the NS-NS $B_2$ field to the RR $F_1$ field through $|F̃_5|^2$ and $|F̃_3|^2$, respectively, after reducing type IIB on a circle with specific background fluxes and moduli stabilization.
A Natural Framework for Chaotic Inflation · A brief review of existing axion monodromy models · 1.00
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