Gauge-field production during axion inflation in the gradient expansion formalism

Gorbar, É. V.; Schmitz, Kai; Sobol, O. O.; Vilchinskiĭ, S. I.

doi:10.1103/physrevd.104.123504

Cited by 51 publications

(94 citation statements)

References 103 publications

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“…However, numerical solutions taking into account the backreaction from fermion currents have been recently considered in Refs. [39,51] which show that, for values of the ξ parameter for which the Schwinger effect becomes relevant, the numerical solution for the different quantities, in particular for the helicity, lies between the maximal and equilibrium estimates. This feature remains if the Bunch-Davies vacuum is damped by the conducting medium, even for extreme cases of very large damping, leading to very suppressed vacua.…”

Section: Final Commentsmentioning

confidence: 90%

Baryogenesis from combined Higgs - scalar field inflation

Yann¹,

Quirós²

2022

Preprint

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We study a modification of the Higgs inflation scenario where we introduce an extra scalar φ, with mass m, coupled to the Ricci scalar as gφ 2 R, and mixed with the Higgs field h by means of the Lagrangian term µφh 2 . Both fields participate in the inflation process in a unitary theory that predicts values of the cosmological observables in agreement with the results from the Planck/BICEP/Keck collaborations. In addition, by means of a CP odd effective operator that couples φ to the Chern-Simons term of the hypercharge gauge group as f −1 φ φ Y µν Ỹ µν , maximally helical magnetic fields are produced during the last e-folds of inflation.We found a window in the coupling f φ where these fields survive all constraints until the electroweak phase transition, and source the baryon asymmetry of the Universe through the Standard Model chiral anomaly. From a phenomenological perspective, the model can solve the Standard Model instability problem at the scale Q I 10 11 GeV, provided that µ m Q I , and for m O(few) TeV, the φ-h mixing becomes sizable while the theory turns natural. The latter thus predicts modifications of the trilinear and quartic couplings that could be explored at the HE-LHC, as well as at future colliders, and allows for direct φ production at the LHC followed by decay into hh. Present results from ATLAS and CMS already put (mild) bounds on the mass of the heavy scalar as m 0.55 TeV at 95% CL.

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Section: Final Commentsmentioning

confidence: 90%

Baryogenesis from combined Higgs - scalar field inflation

Yann¹,

Quirós²

2022

Preprint

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“…RHN decays and inverse decays at T ∼ M i then impose the conditions µ α + µ φ ≈ µ N i ≈ 0, which allows one to solve Eq. (2.9) for the three flavored B − L charges, α µ ∆α = −3/10 µ e , where µ e is related to the efficiency of gauge-field production during axion inflation [63,64]. While this is only a minimal example for one specific chargegenesis mechanism and one specific RHN mass range, it already illustrates three important properties of wash-in leptogenesis: It is (i) independent of CP violation in the RHN sector, (ii) can operate at RHN masses as low as 100 TeV, and (iii) is especially efficient in what is otherwise known as the strong-washout regime.…”

Section: Contributor: Kai Schmitzmentioning

confidence: 99%

“…Thus, any large-ex can be used to search for this class of sig we considered the specific signals arising which the DM is absorbed by nuclear ta nals can probe DM masses down to an Me in existing data and significantly below wi lower-threshold experiments. If an atom absorbs enough energy from incoming DM the ionized electron may be searched for i signatures, known as S2, in TPCs [61][62][63] a schematic of the signal. Current xenontection experiments such as XENON1T [ as well as future ones such as XENONnT 4T [66], and DARWIN [67], are sensiti absorption of DM with masses in the sub electrons.…”

Section: Introductionmentioning

confidence: 99%

New Ideas in Baryogenesis: A Snowmass White Paper

Elor¹,

Harz²,

Ipek³

et al. 2022

Preprint

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The Standard Model of Particle Physics cannot explain the observed baryon asymmetry of the Universe. This observation is a clear sign of new physics beyond the Standard Model. There have been many recent theoretical developments to address this question. Critically, many new physics models that generate the baryon asymmetry have a wide range of repercussions for many areas of theoretical and experimental particle physics. This white paper provides an overview of such recent theoretical developments with an emphasis on experimental testability. Model Key Ingredients Observable scale Observables Axiogenesis Axion misalignment, sphalerons axion scale ~ O( 10 8-11 GeV) axion mass ~ 𝜇eV Gravitational waves WR baryogenesis axion inflation, WR interactions with the inflaton LR symmetry breaking ~ O( 10 10 GeV) Gravitational waves QCD Baryogenesis Singlet scalar coupled to the gluon field strength,

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“…( 4) is evolved self-consistently with the second Friedmann equation. As commonly done in the literature [15][16][17][18][57][58][59][60], we neglect the role of metric perturbations.…”

Section: Lattice Simulationmentioning

confidence: 99%

Lattice simulations of inflation

Caravano

Komatsu

Lozanov

et al. 2021

J. Cosmol. Astropart. Phys.

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The scalar field theory of cosmological inflation constitutes nowadays one of the preferred scenarios for the physics of the early universe. In this paper we aim at studying the inflationary universe making use of a numerical lattice simulation. Various lattice codes have been written in the last decades and have been extensively used for understating the reheating phase of the universe, but they have never been used to study the inflationary phase itself far from the end of inflation (i.e. about 50 e-folds before the end of inflation). In this paper we use a lattice simulation to reproduce the well-known results of some simple models of single-field inflation, particularly for the scalar field perturbation. The main model that we consider is the standard slow-roll inflation with an harmonic potential for the inflaton field. We explore the technical aspects that need to be accounted for in order to reproduce with precision the nearly scale invariant power spectrum of inflaton perturbations. We also consider the case of a step potential, and show that the simulation is able to correctly reproduce the oscillatory features in the power spectrum of this model. Even if a lattice simulation is not needed in these cases, that are well within the regime of validity of linear perturbation theory, this sets the basis to future work on using lattice simulations to study more complicated models of inflation.

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Gauge-field production during axion inflation in the gradient expansion formalism

Cited by 51 publications

References 103 publications

Baryogenesis from combined Higgs - scalar field inflation

Baryogenesis from combined Higgs - scalar field inflation

New Ideas in Baryogenesis: A Snowmass White Paper

Lattice simulations of inflation

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