Yukawa couplings at infinite distance and swampland towers in chiral theories
Abstract We study limits of vanishing Yukawa couplings of 4d chiral matter fields in Quantum Gravity, using as a laboratory type IIA orientifolds with D6-branes. In these theories chiral fermions arise at brane intersections, where an infinite tower of charged particles dubbed gonions are localised....
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| Format: | Article |
| Language: | English |
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SpringerOpen
2024-09-01
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| Series: | Journal of High Energy Physics |
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| Online Access: | https://doi.org/10.1007/JHEP09(2024)170 |
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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 limits of vanishing Yukawa couplings of 4d chiral matter fields in Quantum Gravity, using as a laboratory type IIA orientifolds with D6-branes. In these theories chiral fermions arise at brane intersections, where an infinite tower of charged particles dubbed gonions are localised. We show that in the limit Y → 0 some of these towers become asymptotically massless, while at the same time the kinetic term of some chiral fields becomes singular and at least two extra dimensions decompactify. For limits parametrised by a large complex structure saxion u, Yukawa couplings have a behaviour of the form Y ~ 1/u r , with r some positive rational number. Moreover, in this limit some of the gauge couplings associated to the Yukawa vanish. The lightest gonion scales are of order m gon ~ g s M P with s > 1, verifying the magnetic WGC with room to spare and with no need of its tower/sublattice versions. We also show how this behaviour can be understood in the context of the emergence of kinetic terms in Quantum Gravity. All these results may be very relevant for phenomenology, given the fact that some of the Yukawa couplings in the Standard Model are very small. |
| format | Article |
| id | doaj-art-f05ab1e7ec7441cfb0841208f5821aef |
| institution | OA Journals |
| issn | 1029-8479 |
| language | English |
| publishDate | 2024-09-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj-art-f05ab1e7ec7441cfb0841208f5821aef2025-08-20T02:20:45ZengSpringerOpenJournal of High Energy Physics1029-84792024-09-012024915810.1007/JHEP09(2024)170Yukawa couplings at infinite distance and swampland towers in chiral theoriesGonzalo F. Casas0Luis E. Ibáñez1Fernando Marchesano2Instituto de Física Teórica UAM-CSICDepartamento de Física Teórica, Universidad Autónoma de MadridInstituto de Física Teórica UAM-CSICAbstract We study limits of vanishing Yukawa couplings of 4d chiral matter fields in Quantum Gravity, using as a laboratory type IIA orientifolds with D6-branes. In these theories chiral fermions arise at brane intersections, where an infinite tower of charged particles dubbed gonions are localised. We show that in the limit Y → 0 some of these towers become asymptotically massless, while at the same time the kinetic term of some chiral fields becomes singular and at least two extra dimensions decompactify. For limits parametrised by a large complex structure saxion u, Yukawa couplings have a behaviour of the form Y ~ 1/u r , with r some positive rational number. Moreover, in this limit some of the gauge couplings associated to the Yukawa vanish. The lightest gonion scales are of order m gon ~ g s M P with s > 1, verifying the magnetic WGC with room to spare and with no need of its tower/sublattice versions. We also show how this behaviour can be understood in the context of the emergence of kinetic terms in Quantum Gravity. All these results may be very relevant for phenomenology, given the fact that some of the Yukawa couplings in the Standard Model are very small.https://doi.org/10.1007/JHEP09(2024)170D-BranesString and Brane PhenomenologyTheories of FlavourSuperstring Vacua |
| spellingShingle | Gonzalo F. Casas Luis E. Ibáñez Fernando Marchesano Yukawa couplings at infinite distance and swampland towers in chiral theories Journal of High Energy Physics D-Branes String and Brane Phenomenology Theories of Flavour Superstring Vacua |
| title | Yukawa couplings at infinite distance and swampland towers in chiral theories |
| title_full | Yukawa couplings at infinite distance and swampland towers in chiral theories |
| title_fullStr | Yukawa couplings at infinite distance and swampland towers in chiral theories |
| title_full_unstemmed | Yukawa couplings at infinite distance and swampland towers in chiral theories |
| title_short | Yukawa couplings at infinite distance and swampland towers in chiral theories |
| title_sort | yukawa couplings at infinite distance and swampland towers in chiral theories |
| topic | D-Branes String and Brane Phenomenology Theories of Flavour Superstring Vacua |
| url | https://doi.org/10.1007/JHEP09(2024)170 |
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