The generation of baryon asymmetry and hypermagnetic field by the chiral vortical effect in the presence of sphalerons
We show how the temperature-dependent chiral vortical effect can generate hypermagnetic fields and matter-antimatter asymmetries, in the symmetric phase of the early Universe, in the temperature range 100GeV≤T≤10TeV, even in the presence of the weak sphaleron processes. We take into account all pert...
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| Format: | Article |
| Language: | English |
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Elsevier
2025-06-01
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| Series: | Nuclear Physics B |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S055032132500104X |
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| author | S. Abbaslu A. Rezaei S. Rostam Zadeh S.S. Gousheh |
| author_facet | S. Abbaslu A. Rezaei S. Rostam Zadeh S.S. Gousheh |
| author_sort | S. Abbaslu |
| collection | DOAJ |
| description | We show how the temperature-dependent chiral vortical effect can generate hypermagnetic fields and matter-antimatter asymmetries, in the symmetric phase of the early Universe, in the temperature range 100GeV≤T≤10TeV, even in the presence of the weak sphaleron processes. We take into account all perturbative chirality-flip processes, as well as the nonperturbative Abelian and non-Abelian anomalous effects for all three generations. Using the constraints and conservation laws in the plasma, we reduce the number of required evolution equations. We also simplify the anomalous transport coefficients, accordingly. We consider both monochromatic and continuous spectra for the hypermagnetic and velocity fields to solve the anomalous magnetohydrodynamics equations. We then show that overlapping small transient fluctuations in the temperature of some matter degrees of freedom and vorticity of the plasma can generate a chiral vortical current, resulting in the generation of strong hypermagnetic fields and matter-antimatter asymmetries, all starting from zero initial values. We obtain the baryon asymmetry ηB≃5×10−10 and a positive helicity hypermagnetic field with amplitude BY(x)≃1019G, at the onset of the electroweak phase transition. Although the sphaleron processes tend to washout the generated (B+L) asymmetry, the anomalous processes prevail and the baryogenesis and leptogenesis occur without (B−L) violation. |
| format | Article |
| id | doaj-art-caedb38b445c43468f8f4ccfdc96d3a0 |
| institution | DOAJ |
| issn | 0550-3213 |
| language | English |
| publishDate | 2025-06-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Nuclear Physics B |
| spelling | doaj-art-caedb38b445c43468f8f4ccfdc96d3a02025-08-20T03:14:06ZengElsevierNuclear Physics B0550-32132025-06-01101511689510.1016/j.nuclphysb.2025.116895The generation of baryon asymmetry and hypermagnetic field by the chiral vortical effect in the presence of sphaleronsS. Abbaslu0A. Rezaei1S. Rostam Zadeh2S.S. Gousheh3Department of Physics, Shahid Beheshti University, Tehran, Iran; School of Physics, Institute for Research in Fundamental Sciences (IPM), P.O. Box 19395-5531, Tehran, IranDepartment of Physics, Shahid Beheshti University, Tehran, IranSchool of Particles and Accelerators, Institute for Research in Fundamental Sciences (IPM), P.O. Box 19395-5531, Tehran, IranDepartment of Physics, Shahid Beheshti University, Tehran, Iran; Corresponding author.We show how the temperature-dependent chiral vortical effect can generate hypermagnetic fields and matter-antimatter asymmetries, in the symmetric phase of the early Universe, in the temperature range 100GeV≤T≤10TeV, even in the presence of the weak sphaleron processes. We take into account all perturbative chirality-flip processes, as well as the nonperturbative Abelian and non-Abelian anomalous effects for all three generations. Using the constraints and conservation laws in the plasma, we reduce the number of required evolution equations. We also simplify the anomalous transport coefficients, accordingly. We consider both monochromatic and continuous spectra for the hypermagnetic and velocity fields to solve the anomalous magnetohydrodynamics equations. We then show that overlapping small transient fluctuations in the temperature of some matter degrees of freedom and vorticity of the plasma can generate a chiral vortical current, resulting in the generation of strong hypermagnetic fields and matter-antimatter asymmetries, all starting from zero initial values. We obtain the baryon asymmetry ηB≃5×10−10 and a positive helicity hypermagnetic field with amplitude BY(x)≃1019G, at the onset of the electroweak phase transition. Although the sphaleron processes tend to washout the generated (B+L) asymmetry, the anomalous processes prevail and the baryogenesis and leptogenesis occur without (B−L) violation.http://www.sciencedirect.com/science/article/pii/S055032132500104X |
| spellingShingle | S. Abbaslu A. Rezaei S. Rostam Zadeh S.S. Gousheh The generation of baryon asymmetry and hypermagnetic field by the chiral vortical effect in the presence of sphalerons Nuclear Physics B |
| title | The generation of baryon asymmetry and hypermagnetic field by the chiral vortical effect in the presence of sphalerons |
| title_full | The generation of baryon asymmetry and hypermagnetic field by the chiral vortical effect in the presence of sphalerons |
| title_fullStr | The generation of baryon asymmetry and hypermagnetic field by the chiral vortical effect in the presence of sphalerons |
| title_full_unstemmed | The generation of baryon asymmetry and hypermagnetic field by the chiral vortical effect in the presence of sphalerons |
| title_short | The generation of baryon asymmetry and hypermagnetic field by the chiral vortical effect in the presence of sphalerons |
| title_sort | generation of baryon asymmetry and hypermagnetic field by the chiral vortical effect in the presence of sphalerons |
| url | http://www.sciencedirect.com/science/article/pii/S055032132500104X |
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