Cosmological solutions in $f(Q)$ gravity via Noether symmetry approach
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arXiv
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| Format: | Preprint |
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2025
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| author | Baghbani, M. Mahmoudzadeh Atazadeh, K. Mousavi, M. |
| author_facet | Baghbani, M. Mahmoudzadeh Atazadeh, K. Mousavi, M. |
| contents | Symmetry plays a crucial role in theoretical physics, especially Noether symmetry, which is a powerful approach for identifying the models at the fundamental level. The exact solution is provided within the point-like Lagrangian framework. In this work, we study one of the alternative theories of gravity based on the non-metricity scalar $Q$, namely $f(Q)$ gravity, via Noether symmetry. We utilize Noether symmetry within the framework of $f(Q)$ gravity to derive the functional expression for $f(Q)$, which is given by $f(Q)=c(Q-nQ)^{\frac{3}{2-2n}}$. To confirm the exact solution of the model through Noether symmetry, we continue to consider the Friedmann-Robertson-Walker (FRW) cosmology with the dynamical solution of the system using dimensionless variables and show that the accelerated expansion of the universe follows a power law scale factor. In the following, we show that the quantities corresponding to the exact solution for $n<1$ lead to an accelerated expansion universe. Finally, in the framework of $f(Q)$ scalar-tensor cosmology, we apply the Noether symmetry approach to find the cosmological models consistent with the Noether symmetry. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_16971 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Cosmological solutions in $f(Q)$ gravity via Noether symmetry approach Baghbani, M. Mahmoudzadeh Atazadeh, K. Mousavi, M. General Relativity and Quantum Cosmology Symmetry plays a crucial role in theoretical physics, especially Noether symmetry, which is a powerful approach for identifying the models at the fundamental level. The exact solution is provided within the point-like Lagrangian framework. In this work, we study one of the alternative theories of gravity based on the non-metricity scalar $Q$, namely $f(Q)$ gravity, via Noether symmetry. We utilize Noether symmetry within the framework of $f(Q)$ gravity to derive the functional expression for $f(Q)$, which is given by $f(Q)=c(Q-nQ)^{\frac{3}{2-2n}}$. To confirm the exact solution of the model through Noether symmetry, we continue to consider the Friedmann-Robertson-Walker (FRW) cosmology with the dynamical solution of the system using dimensionless variables and show that the accelerated expansion of the universe follows a power law scale factor. In the following, we show that the quantities corresponding to the exact solution for $n<1$ lead to an accelerated expansion universe. Finally, in the framework of $f(Q)$ scalar-tensor cosmology, we apply the Noether symmetry approach to find the cosmological models consistent with the Noether symmetry. |
| title | Cosmological solutions in $f(Q)$ gravity via Noether symmetry approach |
| topic | General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2510.16971 |