Cosmic string Y-junctions: a comparison between field theoretic and Nambu-Goto dynamics
We explore the formation of cosmic string Y-junctions when strings of two different types collide, which has recently become important since string theory can yield cosmic strings of distinct types. Using a model containing two types of local U(1) string and stable composites, we simulate the collis...
| Main Authors: | , |
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| Format: | Article |
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American Physical Society
2008
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| Online Access: | https://eprints.nottingham.ac.uk/42124/ |
| _version_ | 1848796424899133440 |
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| author | Bevis, Neil Saffin, Paul M. |
| author_facet | Bevis, Neil Saffin, Paul M. |
| author_sort | Bevis, Neil |
| building | Nottingham Research Data Repository |
| collection | Online Access |
| description | We explore the formation of cosmic string Y-junctions when strings of two different types collide, which has recently become important since string theory can yield cosmic strings of distinct types. Using a model containing two types of local U(1) string and stable composites, we simulate the collision of two straight strings and investigate whether the dynamics matches that previously obtained using the Nambu-Goto action, which is not strictly valid close to the junction. We find that the Nambu-Goto action performs only moderately well at predicting when the collision results in the formation of a pair of Y-junctions (with a composite string connecting them). However, we find that when they do form, the late time dynamics matches those of the Nambu-Goto approximation very closely. We also see little radiative emission from the Y-junction system, which suggests that radiative decay due to bridge formation does not appear to be a means via which a cosmological network of such string would rapidly lose energy. |
| first_indexed | 2025-11-14T19:47:46Z |
| format | Article |
| id | nottingham-42124 |
| institution | University of Nottingham Malaysia Campus |
| institution_category | Local University |
| last_indexed | 2025-11-14T19:47:46Z |
| publishDate | 2008 |
| publisher | American Physical Society |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | nottingham-421242020-05-04T16:27:47Z https://eprints.nottingham.ac.uk/42124/ Cosmic string Y-junctions: a comparison between field theoretic and Nambu-Goto dynamics Bevis, Neil Saffin, Paul M. We explore the formation of cosmic string Y-junctions when strings of two different types collide, which has recently become important since string theory can yield cosmic strings of distinct types. Using a model containing two types of local U(1) string and stable composites, we simulate the collision of two straight strings and investigate whether the dynamics matches that previously obtained using the Nambu-Goto action, which is not strictly valid close to the junction. We find that the Nambu-Goto action performs only moderately well at predicting when the collision results in the formation of a pair of Y-junctions (with a composite string connecting them). However, we find that when they do form, the late time dynamics matches those of the Nambu-Goto approximation very closely. We also see little radiative emission from the Y-junction system, which suggests that radiative decay due to bridge formation does not appear to be a means via which a cosmological network of such string would rapidly lose energy. American Physical Society 2008-07-02 Article PeerReviewed Bevis, Neil and Saffin, Paul M. (2008) Cosmic string Y-junctions: a comparison between field theoretic and Nambu-Goto dynamics. Physical Review D, 78 (2). 023503. ISSN 2470-0029 https://journals.aps.org/prd/abstract/10.1103/PhysRevD.78.023503 doi:10.1103/PhysRevD.78.023503 doi:10.1103/PhysRevD.78.023503 |
| spellingShingle | Bevis, Neil Saffin, Paul M. Cosmic string Y-junctions: a comparison between field theoretic and Nambu-Goto dynamics |
| title | Cosmic string Y-junctions: a comparison between field theoretic and Nambu-Goto dynamics |
| title_full | Cosmic string Y-junctions: a comparison between field theoretic and Nambu-Goto dynamics |
| title_fullStr | Cosmic string Y-junctions: a comparison between field theoretic and Nambu-Goto dynamics |
| title_full_unstemmed | Cosmic string Y-junctions: a comparison between field theoretic and Nambu-Goto dynamics |
| title_short | Cosmic string Y-junctions: a comparison between field theoretic and Nambu-Goto dynamics |
| title_sort | cosmic string y-junctions: a comparison between field theoretic and nambu-goto dynamics |
| url | https://eprints.nottingham.ac.uk/42124/ https://eprints.nottingham.ac.uk/42124/ https://eprints.nottingham.ac.uk/42124/ |