The Trundholm sun chariot was found in a peat bog on the island of Zealand, Denmark, in 1902. It's thought to be an Indo-European religious artifact dating back to the Nordic Bronze Age; a representation of a horse pulling the Divine Twins, the sun and the moon, in a spoked wheel chariot.
The Divine Twins are a key part of Indo-European mythology, and they appear in the Rigveda, the most archaic of the Indo-Aryan Vedic texts.
However, because the concept includes the spoked wheel chariot, it probably can't be much older than 2,000 BC. That's because the invention of the spoked wheel chariot is more often than not credited to the Sintashta Culture of the Trans-Urals, dated to 2100-1800 BC.
Considering these cultural and technological ties between Bronze Age Scandinavia and South Asia, it's an interesting question whether there were also strong genetic links between these two outposts of the early Indo-European world.
Unfortunately, we don't yet have any ancient genomes from South Asia to compare to the Late Neolithic/Bronze Age (LN/BA) Nordic genomes published recently with Allentoft et al. 2015. However, we do have the Kalash.
The Kalash people of the Hindu Kush are Indo-Aryans, but they're also an extreme cultural and genetic isolate. It's likely that they haven't mixed very much with any of their neighbors since the Bronze Age. About half of them also practice a unique Vedic religion with a mythos featuring the sun and moon (see section 1.5.4. "Creation myths" in Witzel 2002).
In the TreeMix analysis below I used three random Kalash individuals from the Human Origins dataset (HGDP00311, HGDP00313 and HGDP00315). I didn't run the whole set of 18 because they seem to create a genetic monolith that is impossible to break down and analyze correctly with TreeMix.
Note that after their Central Asian admixture is accounted for with a migration edge of 33%, the Kalash sit on what appears to be an early Indo-European branch that also includes the LN/BA Scandinavians. The full output from this analysis is available for download here.
I also employed the qpAdm program to model all of the Kalash from the Human Origins as a mixture of LN/BA Scandinavians, various ancient and present-day West Asians and Dai from south China. The ancestry proportions are listed at the bottom of the sheets. To check the success of the models consult the chisq, tail prob and standard (std.) errors.
Nordic LN-BA/Armenia BA/DaiNow, qpAdm is easy to run but very difficult to use correctly. However, even when fumbling around like a drunk with this software, it's easy to pick up some useful hints. Clearly, even if the ancestry proportions are way off, the Kalash show stronger affinity to the ancient Scandinavians than to West Asians. Also, the models more or less reflect the TreeMix analysis above.
Nordic LN-BA/Iranian Jew/Dai
Thus, the answer to my question is a resounding yes; there were indeed strong genetic ties between Scandinavia and South Asia during the Bronze Age. Moreover, these ties were in all likelihood not mediated via West Asia, but via the Sintashta Culture of the Eurasian steppe and its close relatives.
The real thing