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| Natura: | Preprint |
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2025
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| Accesso online: | https://arxiv.org/abs/2511.22666 |
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| _version_ | 1866918357029093376 |
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| author | Bonanno, Alfio M. Haridev, S. R. Narain, Gaurav |
| author_facet | Bonanno, Alfio M. Haridev, S. R. Narain, Gaurav |
| contents | In this work we studies the long-range interactions in non-gravitational field theories and their behaviour in the deep infrared. To model such effects, we consider a nonlocal scalar theory obtained by adding a $ϕ\Box^{-1}ϕ$ term to the local action. Using the functional renormalisation group, we analyse its infrared fixed-point structure. Within the LPA, we show that nonlocality modifies phase-transition patterns and can induce symmetry breaking. Extending the LPA beyond polynomial truncations, we examine the convexity property of the effective potential as $k\rightarrow 0$ and find that the flow becomes singular for $λ^{2}>0$ before reaching the deep infrared. In the LPA$'$ framework, we find that the infrared-stable fixed point is the nonlocal Gaussian fixed point. We then generalise the model to $ϕ\Box^{σ/2}ϕ$ and analyse how the infrared properties depend on $σ$. With appropriate scaling choices, we show that the infrared behaviour remains unchanged up to $σ=d/2$ and follows Sak's prediction up to $σ=2$. Finally, we study higher-derivative cases within the LPA, focusing on $σ=4$, which corresponds to isotropic Lifshitz criticality, and obtain results consistent with earlier work. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_22666 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | RG studies of scalar-field models of long-range interactions Bonanno, Alfio M. Haridev, S. R. Narain, Gaurav High Energy Physics - Theory In this work we studies the long-range interactions in non-gravitational field theories and their behaviour in the deep infrared. To model such effects, we consider a nonlocal scalar theory obtained by adding a $ϕ\Box^{-1}ϕ$ term to the local action. Using the functional renormalisation group, we analyse its infrared fixed-point structure. Within the LPA, we show that nonlocality modifies phase-transition patterns and can induce symmetry breaking. Extending the LPA beyond polynomial truncations, we examine the convexity property of the effective potential as $k\rightarrow 0$ and find that the flow becomes singular for $λ^{2}>0$ before reaching the deep infrared. In the LPA$'$ framework, we find that the infrared-stable fixed point is the nonlocal Gaussian fixed point. We then generalise the model to $ϕ\Box^{σ/2}ϕ$ and analyse how the infrared properties depend on $σ$. With appropriate scaling choices, we show that the infrared behaviour remains unchanged up to $σ=d/2$ and follows Sak's prediction up to $σ=2$. Finally, we study higher-derivative cases within the LPA, focusing on $σ=4$, which corresponds to isotropic Lifshitz criticality, and obtain results consistent with earlier work. |
| title | RG studies of scalar-field models of long-range interactions |
| topic | High Energy Physics - Theory |
| url | https://arxiv.org/abs/2511.22666 |