Topological defects as effective dynamical dark energy
Fuente:
arXiv
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| Autores principales: | , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| _version_ | 1866918055576076288 |
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| author | An, Haipeng Han, Chengcheng Zhang, Borui |
| author_facet | An, Haipeng Han, Chengcheng Zhang, Borui |
| contents | In this work, we consider the possibility that the dynamical dark energy hinted at by recent DESI data may be mimicked by the effects of additional components in the universe, potentially arising from topological defects. We find that the data does not show a particular preference for the existence of cosmic strings. However, a domain wall contribution at the percent level can improve the fit, yielding a $Δχ^2= -1.72$ compared to the $Λ\rm{CDM}$ model. The improvement indicates that topological defects remain a viable and interesting extension to $Λ\rm{CDM}$, meriting further investigation with future cosmological data. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_10075 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Topological defects as effective dynamical dark energy An, Haipeng Han, Chengcheng Zhang, Borui High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics In this work, we consider the possibility that the dynamical dark energy hinted at by recent DESI data may be mimicked by the effects of additional components in the universe, potentially arising from topological defects. We find that the data does not show a particular preference for the existence of cosmic strings. However, a domain wall contribution at the percent level can improve the fit, yielding a $Δχ^2= -1.72$ compared to the $Λ\rm{CDM}$ model. The improvement indicates that topological defects remain a viable and interesting extension to $Λ\rm{CDM}$, meriting further investigation with future cosmological data. |
| title | Topological defects as effective dynamical dark energy |
| topic | High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2506.10075 |