Relativity solution for "Twin paradox": a comprehensive solution

We have provided a complete and realistic solution to the problem of Twin Paradox, for the first time, in the frame work of general relativity. Some of the inspiration for this paper has come from the well known papers by Linet and Teyssandier (Phys Rev D 66:024045, 2002) discussing objects moving on geodesics for more general metrics than Schwarzschild. The subject of the "Twin paradox" is encountered frequently in relativity classes but a complete solution in the general relativity framework is not being taught. Our approaches have covered all the cases, starting with inertial motion in flat space time, going through hyperbolic motion in flat space time and ending with the treatment for curved space time.