Massive Double Copy in the High-Energy Limit

Understand

The exploration of the massive double copy is still in its infancy, and only a few examples in limited contexts are known.

• In this paper, we analyze the newly discovered double copy for topologically massive theories beyond tree-level amplitudes in the high-energy (eikonal) limit.
• We find that contrary to the simple double copy relation that occurs in the massless $d\geq4$ case, the massive double copy requires information outside the eikonal limit to give correct results.
• However, a simple double copy relation arises for the phase shift.