Hi student!

A part time Ph.D. in India is equally valid as full-time PhD programs provided it conforms to the rules and regulations of the degree-awarding university and the University Grant Commission

Some of the best Institutions for part time PhD physics are:

• Indian Institute of Technology, Bhilai.
• Indian Institute of Technology, Kanpur.
• Indian Institute of Technology, Ropar.
• Institute for Social and Economic Change, Bangalore.
• VIT University, Chennai
• Jamia Millia Islamia University, Delhi.

Hope this helps!

Thank you!