Abstract
Recently, we have explored vices and virtues of \(R^{\frac{3}{2}}\) term in the action which has in-built Noether symmetry and anticipated that a linear term might improve the situation (Sarkar et al., arXiv:1201.2987 [astro-ph.CO], 2012). In the absence of a conserved current it is extremely difficult to obtain an analytical solution of the said fourth order theory of gravity in the presence of a linear term. Here, we therefore enlarge the configuration space by including a scalar field in addition and also taking some of the anisotropic models (in the absence of a scalar field) into account. We observe that Noether symmetry remains obscure and it does not even reproduce the one that already exists in the literature (Sanyal, Gen. Relativ. Gravit., 37:407, 2005). However, there exists in general, a conserved current for F(R) theory of gravity in the presence of a non-minimally coupled scalar field (Sanyal, Phys. Lett. B, 624:81, 2005; Mod. Phys. Lett. A, 25:2667, 2010), which simplifies the field equations considerably. Here, we briefly expatiate the non-Noether conserved current and show that indeed the situation is modified.
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Sarkar, K., Sk, N., Debnath, S. et al. Viability of Noether Symmetry of F(R) Theory of Gravity. Int J Theor Phys 52, 1194–1213 (2013). https://doi.org/10.1007/s10773-012-1436-8
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DOI: https://doi.org/10.1007/s10773-012-1436-8