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SU(2)$_R$ and its Axion in Cosmology: A common Origin for Inflation, Cold Sterile Neutrinos, and Baryogenesis
High Energy Physics - Phenomenology · Submitted 21 Dec 2020
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim This model merges three milestones of modern cosmology, i.e., inflation, cold dark matter, and baryon asymmetry.
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The abstract, sentence by sentence
We introduce an axion-inflation model embedded in the Left-Right symmetric extension of the SM in which $W_R$ is coupled to the axion. This model merges three milestones of modern cosmology, i.e., inflation, cold dark matter, and baryon asymmetry. Thus, it can naturally explain the observed coincidences among cosmological parameters, i.e., $\eta_{B}\approx P_{\zeta}$ and $\Omega_{DM} \simeq 5~\Omega_{B}$. The source of asymmetry is spontaneous CP violation in the physics of inflation, and the lightest right-handed neutrino is the cold dark matter candidate with mass $m_{N_1}\sim 1~GeV$. The introduced mechanism does not rely on the largeness of the unconstrained CP-violating phases in the neutrino sector nor fine-tuned masses for the heaviest right-handed neutrinos. It has two unknown fundamental scales, i.e. scale of inflation $\Lambda_{\rm inf}=\sqrt{HM_{Pl}}$ and left-right symmetry breaking $\Lambda_{F}$. Sufficient matter asymmetry demands $\Lambda_{\rm inf}\approx\Lambda_{F}$. The baryon asymmetry and dark matter today are remnants of a pure quantum effect (chiral anomaly) in inflation, which, thanks to flavor effects, are memorized by cosmic evolution.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | We introduce an axion-inflation model embedded in the Left-Right symmetric extension of the SM in which $W_R$ is coupled to the axion. | contribution 0.98 | 0.92 | 0.07 | asserted 0.99 |
| s1 | This model merges three milestones of modern cosmology, i.e., inflation, cold dark matter, and baryon asymmetry. | contribution 0.90 | 0.81 | 0.43 | asserted 1.00 |
| s2 | Thus, it can naturally explain the observed coincidences among cosmological parameters, i.e., $\eta_{B}\approx P_{\zeta}$ and $\Omega_{DM} \simeq 5~\Omega_{B}$. | interpretation 0.56 | 0.61 | 0.26 | hedged possibility 0.51 |
| s3 | The source of asymmetry is spontaneous CP violation in the physics of inflation, and the lightest right-handed neutrino is the cold dark matter candidate with mass $m_{N_1}\sim 1~GeV$. | result 0.56 | 0.71 | 0.23 | asserted 1.00 |
| s4 | The introduced mechanism does not rely on the largeness of the unconstrained CP-violating phases in the neutrino sector nor fine-tuned masses for the heaviest right-handed neutrinos. | result 0.36 | 0.73 | 0.06 | asserted 1.00 |
| s5 | It has two unknown fundamental scales, i.e. scale of inflation $\Lambda_{\rm inf}=\sqrt{HM_{Pl}}$ and left-right symmetry breaking $\Lambda_{F}$. | method 0.51 | 0.68 | 0.04 | asserted 1.00 |
| s6 | Sufficient matter asymmetry demands $\Lambda_{\rm inf}\approx\Lambda_{F}$. | result 0.83 | 0.73 | 0.13 | asserted 1.00 |
| s7 | The baryon asymmetry and dark matter today are remnants of a pure quantum effect (chiral anomaly) in inflation, which, thanks to flavor effects, are memorized by cosmic evolution. | interpretation 0.91 | 0.66 | 0.39 | asserted 1.00 |
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The paper
Original abstract
We introduce an axion-inflation model embedded in the Left-Right symmetric extension of the SM in which $W_R$ is coupled to the axion. This model merges three milestones of modern cosmology, i.e., inflation, cold dark matter, and baryon asymmetry. Thus, it can naturally explain the observed coincidences among cosmological parameters, i.e., $\eta_{B}\approx P_{\zeta}$ and $\Omega_{DM} \simeq 5~\Omega_{B}$. The source of asymmetry is spontaneous CP violation in the physics of inflation, and the lightest right-handed neutrino is the cold dark matter candidate with mass $m_{N_1}\sim 1~GeV$. The introduced mechanism does not rely on the largeness of the unconstrained CP-violating phases in the neutrino sector nor fine-tuned masses for the heaviest right-handed neutrinos. It has two unknown fundamental scales, i.e. scale of inflation $\Lambda_{\rm inf}=\sqrt{HM_{Pl}}$ and left-right symmetry breaking $\Lambda_{F}$. Sufficient matter asymmetry demands $\Lambda_{\rm inf}\approx\Lambda_{F}$. The baryon asymmetry and dark matter today are remnants of a pure quantum effect (chiral anomaly) in inflation, which, thanks to flavor effects, are memorized by cosmic evolution.
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References
How the literature uses it
20 arXiv papers cite this in 42 sentences
Papers citing it · 32 sentences without a confident label
Uses its method or tool 1 paper
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To estimate the Chern-Simons number, one may first reform the term $F^'F^'$ into a total derivative, $2∂_μK^μ$, and take $K^0$ as the Chern-Simons number [ref] , n_CS ≡1/(2π)^2 𝒦 (ξ) a^3 H^3 =1/(2π)^2 ∑_λ=± λe^iκ_λπ ∫τ̃^3 dlnτ̃ W^*_κ_λ,μ(-2iτ̃)W_λ_σ,μ(-2iτ̃) a^3 H^3 in which one has defined the function $𝒦 (ξ)$.
Axion-Inflation Baryogenesis via New U(1) gauge symmetries · Baryogenesis · 0.91
Cites it as background 8 papers
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We consider a model where inflation is driven by a pseudoscalar “axionlike" $ϕ$, which is coupled to gauge fields through Chern-Simons interaction $ϕFF̃$ [ref] .
Lattice Simulations of Axion-U(1) Inflation · Introduction · 0.85
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In this paper, we work in the framework of the axion-inflation Baryogenesis, in which the pseudo-scalar inflaton [ref] couples to the Chern-Simons gravity [ref] or gauge fields [ref] .
Axion-Inflation Baryogenesis via New U(1) gauge symmetries · Introduction · 0.96
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Previous studies in this area have focussed on the massless limit [ref] , as well as on the production and backreaction of massive fermions [ref] .
Production and backreaction of massive fermions during axion inflation with non-Abelian gauge fields · Introduction · 0.97
What it cites · 9 sentences without a confident label
Cites as background 1 paper
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One of the most well-studied leptogenesis scenarios with new gauge interactions is the LRSMs [ref] .
Sterile Neutrino Dark Matter and Leptogenesis in Left-Right Higgs Parity · Introduction · 0.92
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