# Formal degrees and local theta correspondence: quaternion case

@article{Kakuhama2020FormalDA, title={Formal degrees and local theta correspondence: quaternion case}, author={Hirotala Kakuhama}, journal={arXiv: Number Theory}, year={2020} }

In this paper, we determine a constant occurring in a local analogue of the Siegel-Weil formula, and describe the behavior of the formal degree under the local theta correspondence for quaternion dual pairs of almost equal rank over a non-Archimedean local field of characteristic $0$. As an application, we prove the formal degree conjecture of Hiraga-Ichino-Ikeda for the non-split inner forms of ${\rm Sp}_4$ and ${\rm GSp}_4$.

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