New-born strings are tensionless
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arXiv
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| Auteurs principaux: | , |
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| Format: | Preprint |
| Publié: |
2026
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| _version_ | 1866910107313373184 |
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| author | Karan, Sudip Majhi, Bibhas Ranjan |
| author_facet | Karan, Sudip Majhi, Bibhas Ranjan |
| contents | We report a physical origin of tensionless strings, obtained by formulating string dynamics in finite-lifetime settings for the first time. Departing from the conventional paradigm of eternal strings, we construct an inertial worldsheet confined to a finite region of two-dimensional Minkowski spacetime, known as a causal diamond. This reveals a striking result: tensionless strings arise only at the moment of their birth. The ultra-shrinking limit of the diamond worldsheet realizes this birth configuration, thereby uncovering a new tensionless string phase characterized by a global, ultra-local Carrollian structure. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_05173 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | New-born strings are tensionless Karan, Sudip Majhi, Bibhas Ranjan High Energy Physics - Theory We report a physical origin of tensionless strings, obtained by formulating string dynamics in finite-lifetime settings for the first time. Departing from the conventional paradigm of eternal strings, we construct an inertial worldsheet confined to a finite region of two-dimensional Minkowski spacetime, known as a causal diamond. This reveals a striking result: tensionless strings arise only at the moment of their birth. The ultra-shrinking limit of the diamond worldsheet realizes this birth configuration, thereby uncovering a new tensionless string phase characterized by a global, ultra-local Carrollian structure. |
| title | New-born strings are tensionless |
| topic | High Energy Physics - Theory |
| url | https://arxiv.org/abs/2604.05173 |