On small Dirac neutrino masses in string theory
Abstract We study how tiny Dirac neutrino masses consistent with experimental constraints can arise in string theory SM-like vacua. We use as a laboratory 4d N $$ \mathcal{N} $$ = 1 type IIA Calabi-Yau orientifold compactifications, and in particular recent results on Yukawa couplings at infinite fi...
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| Format: | Article |
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2025-01-01
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| Series: | Journal of High Energy Physics |
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| Online Access: | https://doi.org/10.1007/JHEP01(2025)083 |
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| author | Gonzalo F. Casas Luis E. Ibáñez Fernando Marchesano |
| author_facet | Gonzalo F. Casas Luis E. Ibáñez Fernando Marchesano |
| author_sort | Gonzalo F. Casas |
| collection | DOAJ |
| description | Abstract We study how tiny Dirac neutrino masses consistent with experimental constraints can arise in string theory SM-like vacua. We use as a laboratory 4d N $$ \mathcal{N} $$ = 1 type IIA Calabi-Yau orientifold compactifications, and in particular recent results on Yukawa couplings at infinite field-space distance. In this regime we find Dirac neutrino masses of the form m ν ≃ g ν ⟨H⟩, with g ν the gauge coupling of the massive U(1) under which the right-handed neutrinos ν R are charged, and which should be in the range g ν ≃ 10 −14 − 10 −12 to reproduce neutrino data. The neutrino mass suppression occurs because the right-handed neutrino kinetic term behaves as K νν ≃ 1/ g ν 2 $$ {g}_{\nu}^2 $$ . At the same time a tower of ν R -like states appears with characteristic scale m 0 ≃ g ν 2 M P $$ {g}_{\nu}^2{M}_{\textrm{P}} $$ ≃ 0.1 − 500 eV, in agreement with Swampland expectations. Two large hidden dimensions only felt by the ν R sector arise at the same scale, while the string scale is around M s ≃ g ν M P ≃ 10 − 700 TeV. Some phenomenological implications and model building challenges are described. We also describe the difficulties in obtaining appropriate tiny neutrino Yukawas in the cases of a single or more than two large dimensions. Thus the case with two large dimensions seems to be quite unique. |
| format | Article |
| id | doaj-art-95080539e0d9452db69152a9ff50d464 |
| institution | Kabale University |
| issn | 1029-8479 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj-art-95080539e0d9452db69152a9ff50d4642025-02-09T12:07:26ZengSpringerOpenJournal of High Energy Physics1029-84792025-01-012025113810.1007/JHEP01(2025)083On small Dirac neutrino masses in string theoryGonzalo F. Casas0Luis E. Ibáñez1Fernando Marchesano2Instituto de Física Teórica UAM-CSICDepartamento de Física Teórica, Universidad Autónoma de MadridDepartamento de Física Teórica, Universidad Autónoma de MadridAbstract We study how tiny Dirac neutrino masses consistent with experimental constraints can arise in string theory SM-like vacua. We use as a laboratory 4d N $$ \mathcal{N} $$ = 1 type IIA Calabi-Yau orientifold compactifications, and in particular recent results on Yukawa couplings at infinite field-space distance. In this regime we find Dirac neutrino masses of the form m ν ≃ g ν ⟨H⟩, with g ν the gauge coupling of the massive U(1) under which the right-handed neutrinos ν R are charged, and which should be in the range g ν ≃ 10 −14 − 10 −12 to reproduce neutrino data. The neutrino mass suppression occurs because the right-handed neutrino kinetic term behaves as K νν ≃ 1/ g ν 2 $$ {g}_{\nu}^2 $$ . At the same time a tower of ν R -like states appears with characteristic scale m 0 ≃ g ν 2 M P $$ {g}_{\nu}^2{M}_{\textrm{P}} $$ ≃ 0.1 − 500 eV, in agreement with Swampland expectations. Two large hidden dimensions only felt by the ν R sector arise at the same scale, while the string scale is around M s ≃ g ν M P ≃ 10 − 700 TeV. Some phenomenological implications and model building challenges are described. We also describe the difficulties in obtaining appropriate tiny neutrino Yukawas in the cases of a single or more than two large dimensions. Thus the case with two large dimensions seems to be quite unique.https://doi.org/10.1007/JHEP01(2025)083D-BranesString and Brane PhenomenologyLarge Extra DimensionsTheories of Flavour |
| spellingShingle | Gonzalo F. Casas Luis E. Ibáñez Fernando Marchesano On small Dirac neutrino masses in string theory Journal of High Energy Physics D-Branes String and Brane Phenomenology Large Extra Dimensions Theories of Flavour |
| title | On small Dirac neutrino masses in string theory |
| title_full | On small Dirac neutrino masses in string theory |
| title_fullStr | On small Dirac neutrino masses in string theory |
| title_full_unstemmed | On small Dirac neutrino masses in string theory |
| title_short | On small Dirac neutrino masses in string theory |
| title_sort | on small dirac neutrino masses in string theory |
| topic | D-Branes String and Brane Phenomenology Large Extra Dimensions Theories of Flavour |
| url | https://doi.org/10.1007/JHEP01(2025)083 |
| work_keys_str_mv | AT gonzalofcasas onsmalldiracneutrinomassesinstringtheory AT luiseibanez onsmalldiracneutrinomassesinstringtheory AT fernandomarchesano onsmalldiracneutrinomassesinstringtheory |