Key points are not available for this paper at this time.
The existence of a phoneme /h/ in Proto–Indo–European is still the subject of debate in academic circles. While the supporters of the laryngeal theory take its existence foregranted along with other phonemes of an abstractly laryngeal nature, the detractors of this theory are basically divided between those who deny its existence and those others, supporters of the so–called monolaryngealist theory, who do accept its existence.
Ballester et al. (2024) studied this question.