The Source Book (1)

Anatolian IE is generally considered more likely than a passage through
the Caucasus, due, for example, to greater Anatolian IE presence and
language diversity in the west."[29]

Outlier theories

A number of other theories have been proposed, most of which have
little or no academic currency today (see discussion below):

 Modern nationalist doctrines:

o Indigenous Aryans, which suggests a homeland in the Indian

subcontinent in the 6th millennium BCE, and is favored

by Hindu nationalists

o Arctic theory, with a 6th millennium BCE or later origin

in Northern Europe, according to Indian nationalist B. G.

Tilak; and Lothar Kilian's and, especially, Marek Zvelebil's

models of a broader homeland,[34] which is favored by

European and white ethnonationalists

 Paleolithic continuity theory, with an origin in the Upper

Paleolithic

 Nikolai Trubetzkoy's theory of Sprachbund origin of Indo-

European traits

Theoretical considerations;

Traditionally, homelands of linguistic families are proposed based on
evidence from comparative linguistics coupled with evidence of
historical populations and migrations from archaeology. Today,
genetics via DNA samples is increasingly used in the study of ancient
population movements.