Aspects of strings without spacetime supersymmetry
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arXiv
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866917472694697984 |
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| author | Leone, Giorgio Raucci, Salvatore |
| author_facet | Leone, Giorgio Raucci, Salvatore |
| contents | String theory relies on spacetime supersymmetry to guarantee the existence of stable vacua. In this review, we survey two features of non-supersymmetric strings that challenge both aspects: the appearance of tachyons and worldsheet tadpoles. We describe how tachyons arise, how to characterise their presence in closed strings and in their orientifold projections, and how off-shell approaches can be used to tackle them. We then turn to tachyon-free, non-supersymmetric strings. After introducing the simplest ten-dimensional models, we address the additional issues raised by tadpoles and the spacetime consequences of their cancellation. Finally, we discuss recent attempts to explore the non-supersymmetric string landscape. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_24703 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Aspects of strings without spacetime supersymmetry Leone, Giorgio Raucci, Salvatore High Energy Physics - Theory String theory relies on spacetime supersymmetry to guarantee the existence of stable vacua. In this review, we survey two features of non-supersymmetric strings that challenge both aspects: the appearance of tachyons and worldsheet tadpoles. We describe how tachyons arise, how to characterise their presence in closed strings and in their orientifold projections, and how off-shell approaches can be used to tackle them. We then turn to tachyon-free, non-supersymmetric strings. After introducing the simplest ten-dimensional models, we address the additional issues raised by tadpoles and the spacetime consequences of their cancellation. Finally, we discuss recent attempts to explore the non-supersymmetric string landscape. |
| title | Aspects of strings without spacetime supersymmetry |
| topic | High Energy Physics - Theory |
| url | https://arxiv.org/abs/2509.24703 |