Mukul Jain, enrolled in IGNOU's Life Sciences course, has been missing since January 8, they said.
He was not a registered student of the Jawaharlal Nehru University and had gone to meet his research adviser in the JNU campus, and later went missing, police said.
Earlier in the day, police had said, Jain was a student of the JNU.
Director of Research Unit of IGNOU, Kaustuva Barik confirmed that, "Jain was a PhD scholar of the open university whose first supervisor was from the IGNOU, and a co-supervisor from the JNU."
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A missing report was registered in the evening of January 8. It is suspected that he was having some problems in his relationship, said a senior police officer from the South-west District.
Till now, no foul play has been suspected, police said.
Incidentally, the prestigious JNU has been in the news for last one year or so for the disappearance of Najeeb Ahmed.
Over a month after the incident, his mother moved the Delhi High Court, seeking directions to the police to trace her son.
The high court on May 16 last year handed over to the CBI the investigation into the disappearance of Najeeb, a student of M.Sc in Biotechnology.