Harmonic hybrid inflation

Carta, Federico; Righi, Nicole; Welling, Yvette; Westphal, Alexander

doi:10.1007/jhep12(2020)161

Cited by 15 publications

(11 citation statements)

References 69 publications

(88 reference statements)

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“…So far we have considered a single-field inflation model, but the ALP inflation can be extended to multi-field inflation where the two axions respectively play the role of the inflaton and waterfall field as in the hybrid inflation [41] (see also refs. [82][83][84]). Even in this case, the consistency relation between the mass and decay constant is known to hold, while the reheating process can be quite different [41].…”

Section: Discussionmentioning

confidence: 99%

What if ALP dark matter for the XENON1T excess is the inflaton

Takahashi

Yamada

Yin

2021

J. High Energ. Phys.

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The recent XENON1T excess in the electron recoil data can be explained by anomaly-free axion-like particle (ALP) dark matter with mass mϕ = 2.3 ± 0.2 keV and the decay constant $$ {f}_{\phi }/{q}_e\simeq 2\times {10}^{10}\sqrt{\Omega_{\phi }/{\Omega}_{\mathrm{DM}}} $$ f ϕ / q e ≃ 2 × 10 10 Ω ϕ / Ω DM GeV. Intriguingly, the suggested mass and decay constant are consistent with the relation, $$ {f}_{\phi}\sim {10}^3\sqrt{m_{\phi }{M}_p} $$ f ϕ ∼ 10 3 m ϕ M p , predicted in a scenario where the ALP plays the role of the inflaton. This raises a possibility that the ALP dark matter responsible for the XENON1T excess also drove inflation in the very early universe. We study implications of the XENON1T excess for the ALP inflation and thermal history of the universe after inflation. We find that the successful reheating requires the ALP couplings to heavy fermions in the standard model, which results in an instantaneous reheating and subsequent thermalization of the ALPs. Then, an entropy dilution of $$ \mathcal{O} $$ O (10) is necessary to explain the XENON1T excess, which can be achieved by decays of the right-handed neutrinos.

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Section: Discussionmentioning

confidence: 99%

What if ALP dark matter for the XENON1T excess is the inflaton

Takahashi

Yamada

Yin

2021

J. High Energ. Phys.

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“…refs. [18][19][20][21][22][23][24][25][26][27][28]). An interesting possibility not requiring the inclusion additional degrees of freedom is to introduce a non-minimal coupling between the Einstein tensor and the inflaton kinetic term.…”

Section: Introduction and Discussionmentioning

confidence: 99%

Chiral gravitational waves and primordial black holes in UV-protected Natural Inflation

Almeida

Bernal

Bettoni

et al. 2020

J. Cosmol. Astropart. Phys.

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We consider an UV-protected Natural Inflation scenario involving Chern-Simonslike interactions between the inflaton and some beyond the Standard Model gauge fields. The accelerated expansion of the Universe is supported by a combination of a gravitationallyenhanced friction sensitive to the scale of inflation and quantum friction effects associated with the explosive production of gauge fluctuations. The synergy of these two velocity-restraining mechanisms allows for: i) Natural Inflation potentials involving only sub-Planckian coupling constants, ii) the generation of a dark matter component in the form of primordial black holes, and iii) a potentially observable background of chiral gravitational waves at small scales.

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“…Despite initial efforts in describing moduli stabilisation in these set-ups [5], a systematic understanding still remains a key challenge where our results provide the golden opportunity to make significant progress in future endeavours [93]. More generally, a variety of inflationary models could benefit from our novel insights such as those based on alignment and hierarchical mixing of odd axions [13,14,77,92] or more recent set-ups like harmonic hybrid inflation [16]. On top of that, the plethora of potentially ultra-light axion-like particles in our set-ups may have direct applications to stringy realisations of Dark Matter [106], Dark Radiation [107][108][109][110], Dark Energy [111][112][113][114][115][116], as well as astrophysics [117,118].…”

Section: Phenomenological Implicationsmentioning

confidence: 99%

“…Notwithstanding, these moduli are ubiquitous in the string landscape and play a prominent role in the context of axion monodromy [4,5]. Over the years, aspects of moduli stabilisation and inflationary model building have for instance been discussed in [5][6][7][8][9][10][11][12][13][14][15][16]. Similarly, explicit constructions including orientifold-odd 2-cycles in concrete Calabi-Yau (CY) threefolds are available in the literature [17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Systematics of type IIB moduli stabilisation with odd axions

Cicoli,

Schachner,

Shukla

2021

Preprint

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Moduli stabilisation in superstring compactifications on Calabi-Yau orientifolds remains a key challenge in the search for realistic string vacua. In particular, odd moduli arising from the reduction of 2-forms (B 2 , C 2 ) in type IIB are largely unexplored despite their relevance for inflationary model building. This article provides novel insights into the general structure of 4D N = 1 F -term scalar potentials at higher orders in the α and g s expansion for arbitrary Hodge numbers. We systematically examine superpotential contributions with distinct moduli dependences which are induced by fluxes or non-perturbative effects. Initially, we prove the existence of a no-scale structure for odd moduli in the presence of (α ) 3 corrections to the Kähler potential. By studying a partially SL(2, Z)-completed form of the Kähler potential, we derive the exact no-scale breaking effects at the closed string 1-loop and non-perturbative D-instanton level. These observations allow us to present rigorous expressions for the F -term scalar potential applicable to arbitrary numbers of moduli in type IIB Calabi-Yau orientifold compactifications. Finally, we compute the Hessian for odd moduli and discuss potential phenomenological implications.

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Harmonic hybrid inflation

Cited by 15 publications

References 69 publications

What if ALP dark matter for the XENON1T excess is the inflaton

What if ALP dark matter for the XENON1T excess is the inflaton

Chiral gravitational waves and primordial black holes in UV-protected Natural Inflation

Systematics of type IIB moduli stabilisation with odd axions

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