ALP inflation and Big Bang on Earth

Takahashi, Fuminobu; Yin, Wen

doi:10.1007/jhep07(2019)095

Cited by 67 publications

(90 citation statements)

References 98 publications

(174 reference statements)

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“…In particular, independent tests of the inflationary dynamics are provided in models with (a part of the) inflaton sector playing some role in late-time cosmology or lowenergy particle phenomenology, see e.g. [4][5][6][7][8]. Among these models, Higgs-driven inflation [9] is in a unique position since the main component in this inflationary model has been discovered [10,11] and its properties were extensively studied at LHC [12].…”

Section: Introductionmentioning

confidence: 99%

Some like it hot: R2 heals Higgs inflation, but does not cool it

et al. 2019

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Strong coupling in Higgs inflation at high energies hinders a joint description of inflation, reheating and low-energy dynamics. The situation may be improved with a proper UV completion of the model. A well-defined self-consistent way is to introduce an R 2 -term into the action. In this modified model the strong coupling scale returns back to the Planck scale, which justifies the use of the perturbative methods in studies of the model dynamics after inflation. We investigate the reheating of the post-inflationary Universe, which involves two highly anharmonic oscillators strongly interacting with each other: homogeneous Higgs field and scalaron. We observe that in interesting regions of model parameter space these oscillations make longitudinal components of the weak gauge bosons tachyonic, triggering instant preheating at timescales much shorter than the Hubble time. The weak gauge bosons are heavy and decay promptly into light Standard Model particles, ensuring the onset of the radiation domination era right after inflation.Email addresses: Fedor.Bezrukov@manchester.ac.uk (Fedor Bezrukov), gorby@ms2.inr.ac.ru (Dmitry Gorbunov), christopher.shepherd-3@postgrad.manchester.ac.uk (Chris Shepherd), tokareva@ms2.inr.ac.ru (Anna Tokareva)

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Section: Introductionmentioning

confidence: 99%

Some like it hot: R2 heals Higgs inflation, but does not cool it

et al. 2019

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“…|y N | ∼ 10 −8 − 10 −7 is predicted from Eqs. (16), (18) and (46). The right-handed neutrino mass is…”

Section: Numerical Estimationmentioning

confidence: 99%

Throwing away antimatter via neutrino oscillations during the reheating era

Eijima

Kitano

Yin

2020

J. Cosmol. Astropart. Phys.

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The simplest possibility to explain the baryon asymmetry of the Universe is to assume that radiation is created asymmetrically between baryons and anti-baryons after the inflation. We propose a new mechanism of this kind where CP-violating flavor oscillations of left-handed leptons in the reheating era distribute the lepton asymmetries partially into the right-handed neutrinos while net asymmetry is not created. The asymmetry stored in the righthanded neutrinos is later washed out by the lepton number violating decays, and it ends up with the net lepton asymmetry in the Standard Model particles, which is converted into the baryon asymmetry by the sphaleron process. This scenario works for a range of masses of the right-handed neutrinos while no fine-tuning among the masses is required. The reheating temperature of the Universe can be as low as O(10) TeV if we assume that the decays of inflatons in the perturbative regime are responsible for the reheating. For the case of the reheating via the dissipation effects, the reheating temperature can be as low as O(100) GeV.

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“…The reheating proceeds through both perturbative decay and dissipation effects. The reheating is indeed instantaneous in a wide parameter range, especially if the inflaton is coupled to the top quarks [2,40].…”

Section: Inflaton Dynamicsmentioning

confidence: 99%

“…In the case of even n inf , this relates the mass of the inflaton at the potential minimum to the decay constant f φ , and it is given by [2,36]…”

Section: Inflaton Dynamicsmentioning

confidence: 99%

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QCD axion on hilltop by a phase shift of π.

Takahashi

Yin

2019

J. High Energ. Phys.

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We show that the initial misalignment angle of the QCD axion (or axion-like particles) can be set very close to π, if the QCD axion has a mixing with another heavy axion which induces the phase shift ≈ π after inflation. In the simplest case, the heavy axion plays the role of the inflaton, and we call such inflation as "πnflation." The basic idea was first proposed by Daido and the present authors in Ref.[1] in 2017 and more recently discussed in Ref. [2]. We show that the QCD axion with a decay constant f a 3 × 10 9 GeV can explain dark matter by the πnflation mechanism. A large fraction of the parameter region has an overlap with the projected sensitivity of ORGAN, MADMAX, TOORAD and IAXO. We also study implications for the effective neutrino species and isocurvature perturbations. The πnflation can provide an initial condition for the hilltop inflation in the axion landscape, and in a certain set-up, a chain of the hilltop inflation may take place. 1 arXiv:1908.06071v2 [hep-ph] 3 Oct 2019 5 The mass and kinetic mixings between the QCD axion and another axion were discussed in e.g. Refs. [41][42][43][44][45], where the level crossing between the two axions can reduce the axion abundance. The mixing can also induce the DM decay [1,46,47]. Also the mixing between axions plays an important role in inflation model building [48][49][50][51][52][53] 6 The axion isocurvature perturbations can be suppressed in this case [58]. See e.g. Refs. [14,26,[59][60][61][62][63][64][65][66][67][68][69][70][71][72][73] for other scenarios to suppress the axion isocurvature.

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ALP inflation and Big Bang on Earth

Cited by 67 publications

References 98 publications

Some like it hot: R2 heals Higgs inflation, but does not cool it

Some like it hot: R2 heals Higgs inflation, but does not cool it

Throwing away antimatter via neutrino oscillations during the reheating era

QCD axion on hilltop by a phase shift of π.

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