A Non-local "Boundary'' Term for Two-Point Amplitudes in String Field Theory
Fuente:
arXiv
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| Autori principali: | , , |
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| Natura: | Preprint |
| Pubblicazione: |
2026
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| _version_ | 1866914527220596736 |
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| author | Gen, Yasu Matsunaga, Hiroaki Totsuka, Jojiro |
| author_facet | Gen, Yasu Matsunaga, Hiroaki Totsuka, Jojiro |
| contents | We propose a new ``boundary'' term in free bosonic string field theory. Here, the term ``boundary'' refers to a contribution introduced to restore the cyclicity broken by the insertion of a stringy step-function operator, although it is not strictly localized as it involves an operator that selects positive-energy modes. We construct this term as a bilinear form involving the commutator of the BRST operator with the step-function operator. The resulting action has a well-defined variational principle. When evaluated on on-shell string fields, the proposed term reproduces the correct tree-level two-point amplitude for both open and closed strings. We verify this explicitly in the tachyon and massless sectors. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_01784 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | A Non-local "Boundary'' Term for Two-Point Amplitudes in String Field Theory Gen, Yasu Matsunaga, Hiroaki Totsuka, Jojiro High Energy Physics - Theory We propose a new ``boundary'' term in free bosonic string field theory. Here, the term ``boundary'' refers to a contribution introduced to restore the cyclicity broken by the insertion of a stringy step-function operator, although it is not strictly localized as it involves an operator that selects positive-energy modes. We construct this term as a bilinear form involving the commutator of the BRST operator with the step-function operator. The resulting action has a well-defined variational principle. When evaluated on on-shell string fields, the proposed term reproduces the correct tree-level two-point amplitude for both open and closed strings. We verify this explicitly in the tachyon and massless sectors. |
| title | A Non-local "Boundary'' Term for Two-Point Amplitudes in String Field Theory |
| topic | High Energy Physics - Theory |
| url | https://arxiv.org/abs/2605.01784 |