English

General form of the function $f(\mathbb{Q})$ using cylindrically static spacetime

General Relativity and Quantum Cosmology 2025-03-06 v1 High Energy Physics - Theory

Abstract

We find an exact static solution in four dimensions to the field equations of the f(Q)f(\mathbb{Q}) gravity by using a cylindrically static spacetime with two different ansatz, ν(r)\nu(r) and μ(r)\mu(r). This solution is derived without imposing any conditions on f(Q)f(\mathbb{Q}). The black hole solution involves four constants: c1c_1, c2c_2, c3c_3, and c4c_4. Among these, c1c_1 is linked to the cosmological constant, c2c_2 to the black hole's mass, while c3c_3 and c4c_4 are responsible for the deviation of the solution from the linear form of f(Q)f(\mathbb{Q}). We demonstrate how the analytical function f(Q)f(\mathbb{Q}) relies on c3c_3. When c3c_3 is zero, f(Q)f(\mathbb{Q}) becomes a constant function, leading to the non-metricity case. We investigate the singularity of this solution and show that the Kretschmann invariant has a much milder singularity compared to the non-metricity case. We produce a black hole that rotates with non-vanishing values of Q\mathbb{Q} and f(Q)f(\mathbb{Q}) by using a coordinate transformation. Then, we analyze the laws of thermodynamics to determine the physical characteristics of this black hole solution and demonstrate that it is locally thermodynamically stable.

Keywords

Cite

@article{arxiv.2503.02902,
  title  = {General form of the function $f(\mathbb{Q})$ using cylindrically static spacetime},
  author = {G. G. L. Nashed},
  journal= {arXiv preprint arXiv:2503.02902},
  year   = {2025}
}

Comments

12 pages, 2 Figs

R2 v1 2026-06-28T22:06:54.987Z