Google has power to fix elections: Reports

"So could highly-ranked search results that make Arvind Kejriwal look better than Narendra Modi drive votes to Kejriwal?" researchers set out to determine.

In research conducted last year in the US, researchers found that search rankings biased in favour of a candidate could push the preferences of undecided voters towards that candidate by 15 per cent or more.

Now, in a new study conducted in recent weeks with more than 2,000 undecided voters throughout India, the researchers have shown that votes in India can easily be pushed towards one candidate or another by about 12 per cent - double that amount in some demographic groups - enough to determine the outcomes of many close races.

"This is a very serious matter - a real threat to democracy," said Dr Robert Epstein, lead researcher in the study and Senior Research Psychologist at the American Institute for Behavioural Research and Technology in California.

"If two candidates were both trying to push their rankings higher, they would be competing, and that's fine. But if Google, which has a monopoly on search in India, were to favour one candidate, it could easily put that candidate in office by manipulating search rankings, and no one could counter what they were doing.

"Even if without human intervention the company's search algorithm favoured one candidate, thousands of votes would still be driven to that candidate," said Epstein.