What are two possible explanations for the origins of the indo-aryans?

Two possible explanations for the origins of the Indo-Aryans are the Aryan Migration Theory, which posits that Indo-Aryans migrated from Central Asia into the Indian subcontinent around 1500 BCE, bringing their language and culture with them. Another explanation is the Indigenous Origin Theory, which suggests that Indo-Aryans developed locally within the Indian subcontinent, integrating with existing cultures and populations rather than migrating from outside. Both theories are supported by linguistic, archaeological, and genetic evidence, but the debate continues among scholars.