Author

I. Sakallı

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Preprint Sep 2026

Constraints on Scalar--Tensor--Vector Gravity Theory Parameters Inferred from Quasiperiodic Oscillations

We study circular geodesics of neutral test particles in the static charged solution of Scalar--Tensor--Vector Gravity (STVG), and we use the twin kilohertz quasiperiodic oscillations (QPOs) of twelve accreting compact objects to bound its parameters. Starting from the effective potential we obtain closed forms for the...

M. Muccino, K. Boshkayev, B. Akhouri et al. · 0 citations

Aug 2026

Is Li Time-Machine Metric Valid in f(R,ℒm,Φ,gμν∇μΦ∇νΦ) Gravity?

A modified gravitational model whose action is given by an arbitrary function of the Ricci scalar, the matter Lagrangian density, a scalar field, and its kinetic term is investigated as an extension of the gravitational sector with one additional dynamical degree of freedom. Within this framework, the causal structure...

F. Ahmed, A. Al-Badawi, I. Sakallı · Modern Physics Letters A · 0 citations