Indigenous Aryanism,

 Indigenous Aryanism, also known as the Indigenous Aryans theory (IAT) and the Out of India theory (OIT), is the conviction^[1] that the Aryans are indigenous to the Indian subcontinent,^[2] and that the Indo-European languages radiated out from a homeland in India into their present locations.^[2] It is a "religio-nationalistic" view of Indian history,^[3][4] and propagated as an alternative to the established migration model,^[5] which considers the Pontic–Caspian steppe to be the area of origin of the Indo-European languages.^{[6][7][8][note 1]I}

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Parpola:

It seems, then, that the earliest Aryan-speaking immigrants to South Asia, the Copper Hoard people, came with bull-drawn carts (Sanauli and Daimabad) via the BMAC and had Proto-Indo-Iranian as their language. They were, however, soon followed (and probably at least partially absorbed) by early Indo-Aryans [...] The dramatic new discovery of cart burials dated to c. 1900 at Sanauli [...] support my proposal of a pre-Ṛgvedic wave (now set of waves) of Aryan speakers arriving in South Asia and their making contact with the Late Harappans.^[11]