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Veneziano amplitude is a 4 tachyon amplitude in bosonic open string theory. Two tachyons are ingoing and two are outgoing. From the stringy point of view, tachyons are present in both closed and open bosonic theory and are the lowest particle in the spectrum, in particular they have negative mass squared: $m_\textrm{open}^2=\frac{-1}{\alpha'}$. In general a ...

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Actually, you can consider a transformation to a tachyonic frame where the relative velocity is greater than c. Then the solution becomes simple, and is no longer meaningless. In the Earth's frame, XYZ was launched before TY. In TY's frame, his spaceship was launched before XYZ. Hence, it is XYZ that needs to catch up to TY! Not the other way round. ...

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All theories are actually models we use trying to describe what we can see and measure. These models are not the Universe itself, we are just trying to find the model that fits best. As physics evolves, we create better models. These usually expand/modify the 'previous one'. In this meaning SR is the foundation of GR, but Newtonian physics is also foundation ...

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