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1.
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Baryogenesis from Decaying Magnetic Helicity in Axiogenesis
/ Co, Raymond T. (Minnesota U., Theor. Phys. Inst.) ; Domcke, Valerie (CERN) ; Harigaya, Keisuke (Chicago U. ; Chicago U., EFI ; Chicago U., Astron. Astrophys. Ctr. ; Chicago U., KICP ; U. Tokyo (main) ; Tokyo U., IPMU ; CERN)
Generating axion dark matter through the kinetic misalignment mechanism implies the generation of large asymmetries for Standard Model fermions in the early universe. Even if these asymmetries are washed out at later times, they can trigger a chiral plasma instability in the early universe. [...]
arXiv:2211.12517; UMN--TH--4206/22; FTPI--MINN--22/36; CERN-TH-2022-199.-
2023-07-24 - 37 p.
- Published in : JHEP 2307 (2023) 179
Fulltext: 2211.12517 - PDF; document - PDF;
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2.
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Lepto-axiogenesis and the scale of supersymmetry
/ Barnes, Patrick (Michigan U., LCTP) ; Co, Raymond T. (Minnesota U., Theor. Phys. Inst.) ; Harigaya, Keisuke (CERN) ; Pierce, Aaron (Michigan U., LCTP)
If the Peccei-Quinn field containing the QCD axion undergoes rotations in the early universe, the dimension-five operator responsible for neutrino masses can generate a lepton asymmetry that ultimately gives rise to the observed baryon asymmetry of the Universe. This lepto-axiogenesis scenario requires a flat potential for the radial direction of the Peccei-Quinn field, naturally realized in supersymmetric models. [...]
arXiv:2208.07878; LCTP-22-12; UMN-TH-4130/22; FTPI-MINN-22-21; CERN-TH-2022-136.-
2023-05-15 - 59 p.
- Published in : JHEP 2305 (2023) 114
Fulltext: document - PDF; 2208.07878 - PDF;
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3.
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Axiogenesis with a Heavy QCD Axion
/ Co, Raymond T. (Minnesota U., Theor. Phys. Inst. ; Minnesota U.) ; Gherghetta, Tony (Minnesota U.) ; Harigaya, Keisuke (CERN)
We demonstrate that the observed cosmological excess of matter over antimatter may originate from a heavy QCD axion that solves the strong CP problem but has a mass much larger than that given by the Standard Model QCD strong dynamics. We investigate a rotation of the heavy QCD axion in field space, which is transferred into a baryon asymmetry through weak and strong sphaleron processes. [...]
arXiv:2206.00678; UMN-TH-4124/22; FTPI-MINN-22/15; CERN-TH-2022-090.-
2022-10-19 - 37 p.
- Published in : JHEP 2210 (2022) 121
Fulltext: document - PDF; 2206.00678 - PDF;
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4.
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Inflationary Gravitational Leptogenesis
/ Co, Raymond T. (Minnesota U., Theor. Phys. Inst.) ; Mambrini, Yann (IJCLab, Orsay ; CERN) ; Olive, Keith A. (Minnesota U., Theor. Phys. Inst.)
We consider the generation of the baryon asymmetry in models with right-handed neutrinos produced through gravitational scattering of the inflaton during reheating. The right-handed neutrinos later decay and generate a lepton asymmetry, which is partially converted to a baryon asymmetry by Standard Model sphaleron processes. [...]
arXiv:2205.01689; CERN-TH-2022-071; UMN-TH-4121/22; FTPI-MINN-22/12.-
2022-10-01 - 6 p.
- Published in : Phys. Rev. D 106 (2022) 075006
Fulltext: 2205.01689 - PDF; Publication - PDF;
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5.
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Early-Universe Model Building
/ Asadi, Pouya (MIT, Cambridge, CTP) ; Bansal, Saurabh (Cincinnati U.) ; Berlin, Asher (Fermilab ; New York U.) ; Co, Raymond T. (Minnesota U., Theor. Phys. Inst.) ; Croon, Djuna (Durham U., IPPP) ; Cui, Yanou (UC, Riverside) ; Curtin, David (Toronto U.) ; Cyr-Racine, Francis-Yan (New Mexico U.) ; Davoudiasl, Hooman (BNL, NSLS) ; Rose, Luigi Delle (Barcelona, IFAE ; BIST, Barcelona) et al.
Theoretical investigations into the evolution of the early universe are an essential part of particle physics that allow us to identify viable extensions to the Standard Model as well as motivated parameter space that can be probed by various experiments and observations. [...]
arXiv:2203.06680 ; FERMILAB-CONF-22-158-T.
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206 p.
Fermilab Library Server - eConf - Fulltext - Fulltext
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6.
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New Ideas in Baryogenesis: A Snowmass White Paper
/ Elor, Gilly (U. Mainz, PRISMA ; Mainz U.) ; Harz, Julia (Munich, Tech. U.) ; Ipek, Seyda (Carleton U.) ; Shakya, Bibhushan (DESY) ; Blinov, Nikita (Victoria U.) ; Co, Raymond T. (Minnesota U., Theor. Phys. Inst.) ; Cui, Yanou (UC, Riverside) ; Dasgupta, Arnab (Brookhaven) ; Davoudiasl, Hooman (Pittsburgh U.) ; Elahi, Fatemeh (U. Mainz, PRISMA ; Mainz U.) et al.
The Standard Model of Particle Physics cannot explain the observed baryon asymmetry of the Universe. [...]
arXiv:2203.05010.
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eConf - Fulltext
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7.
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Cosmic Perturbations from a Rotating Field
/ Co, Raymond T. (Minnesota U.) ; Harigaya, Keisuke (CERN) ; Pierce, Aaron (Michigan U., MCTP)
Complex scalar fields charged under approximate $U(1)$ symmetries appear in well-motivated extensions of the Standard Model. One example is the field that contains the QCD axion field associated with the Peccei-Quinn symmetry; others include flat directions in supersymmetric theories with baryon, lepton, or flavor charges. [...]
arXiv:2202.01785; UMN-TH-4113/22; FTPI-MINN-22-04; CERN-TH-2022-007; LCTP-22-02.-
2022-10-11 - 47 p.
- Published in : JCAP 10 (2022) 037
Fulltext: PDF;
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8.
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9.
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R-Parity Violation Axiogenesis
/ Co, Raymond T. (Minnesota U., Theor. Phys. Inst.) ; Harigaya, Keisuke (CERN ; Princeton, Inst. Advanced Study) ; Johnson, Zachary (Michigan U., LCTP) ; Pierce, Aaron (Michigan U., LCTP)
We show that the rotation of the QCD axion field, aided by $B-L$ violation from supersymmetric $R$-parity violating couplings, can yield the observed baryon abundance. Strong sphaleron processes transfer the angular momentum of the axion field into a quark chiral asymmetry, which $R$-parity violating couplings convert to the baryon asymmetry of the Universe. [...]
arXiv:2110.05487; UMN-TH-4104/21; FTPI-MINN-21-21; CERN-TH-2021-147; LCTP-21-25.-
2021-11-26 - 51 p.
- Published in : JHEP 2111 (2021) 210
Fulltext: document - PDF; 2110.05487 - PDF;
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10.
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Gravitational Wave and CMB Probes of Axion Kination
/ Co, Raymond T. (Minnesota U., Theor. Phys. Inst.) ; Dunsky, David (UC, Berkeley ; LBL, Berkeley) ; Fernandez, Nicolas (Illinois U., Urbana) ; Ghalsasi, Akshay (Pittsburgh U.) ; Hall, Lawrence J. (UC, Berkeley ; LBL, Berkeley) ; Harigaya, Keisuke (CERN ; Princeton, Inst. Advanced Study) ; Shelton, Jessie (Illinois U., Urbana)
Rotations of an axion field in field space provide a natural origin for an era of kination domination, where the energy density is dominated by the kinetic term of the axion field, preceded by an early era of matter domination. Remarkably, no entropy is produced at the end of matter domination and hence these eras of matter and kination domination may occur even after Big Bang Nucleosynthesis. [...]
arXiv:2108.09299; UMN-TH-4023/21; FTPI-MINN-21-15; CERN-TH-2021-124.-
2022-09-15 - 63 p.
- Published in : JHEP 2209 (2022) 116
Fulltext: document - PDF; 2108.09299 - PDF;
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