Jayant Narlikar

Jayant Narlikar
Name	Jayant Narlikar
Birth date	1938-01-19
Birth place	Kolhapur, Bombay Presidency, British India
Nationality	Indian
Fields	Astrophysics, Cosmology
Alma mater	Pune, Cambridge, University of Cambridge
Doctoral advisor	Fred Hoyle
Known for	Work on steady state theory, Mach's principle, cosmology
Awards	Padma Bhushan, Maharashtra Bhushan Award

Jayant Narlikar is an Indian theoretical astrophysicist and cosmologist noted for his work on alternative cosmological models and for promoting science in India. He developed and extended versions of the steady state theory and explored implications of Mach's principle and variable-mass hypotheses, while mentoring generations of researchers at institutions such as the Inter-University Centre for Astronomy and Astrophysics, Tata Institute of Fundamental Research, and the University of Cambridge. He has been active in scientific administration, public science communication, and international scientific collaboration.

Early life and education

Born in Kolhapur in the Bombay Presidency, he was raised in a family connected to literature and public affairs in Maharashtra, where early schooling exposed him to regional intellectual circles and institutions like Savitribai Phule Pune University and local libraries. He proceeded to St Xavier's College, Mumbai for undergraduate studies before earning a Cambridge scholarship to read mathematics and physics at the University of Cambridge, where he worked under the supervision of Fred Hoyle and associated with contemporaries from Royal Society-linked groups and visiting scholars from Princeton University, University of Chicago, and California Institute of Technology.

Academic career and research

Narlikar's early academic appointments included positions at the Tata Institute of Fundamental Research and later leadership roles at the Inter-University Centre for Astronomy and Astrophysics and the Pune University physics department. He collaborated with researchers from King's College London, University of Cambridge, Harvard University, and the Institute of Astronomy in Cambridge, contributing to theoretical work on cosmological solutions, scalar-tensor theories, and the influence of Mach's principle on inertia. His network included interactions with figures such as Fred Hoyle, Thomas Gold, Hermann Bondi, Roger Penrose, Subrahmanyan Chandrasekhar, and visiting scholars from Max Planck Institute for Astrophysics, CERN, and NASA centers.

Contributions to cosmology and the steady state theory

Narlikar extended and mathematically formalized alternative steady state theory frameworks, incorporating ideas from conformal gravity approaches and variable mass theories inspired by Mach's principle and scalar field dynamics reminiscent of concepts explored at Princeton and Cambridge. He developed cosmological models addressing the cosmic microwave background debates, worked on predictions relating to quasars, galaxy formation, and nucleosynthesis alternatives, and proposed observational tests linking his models to surveys conducted by teams at Royal Observatory, Edinburgh, Palomar Observatory, Kitt Peak National Observatory, Mount Wilson Observatory, and projects like the Sloan Digital Sky Survey. His research interfaced with topics studied by the Royal Astronomical Society, American Astronomical Society, International Astronomical Union, European Southern Observatory, and influenced discussions alongside contributions from Stephen Hawking, George F. R. Ellis, Jim Peebles, Allan Sandage, and Vera Rubin.

Awards and honors

He has been recognized with Indian and international honors including the Padma Bhushan, the Maharashtra Bhushan Award, and fellowships in bodies such as the Indian National Science Academy, the Royal Astronomical Society, and the Third World Academy of Sciences (TWAS). His awards and invited lectures have connected him to institutional programs at the Indian Space Research Organisation, Council of Scientific and Industrial Research, Department of Science and Technology (India), National Academy of Sciences, India, and international forums including events at Royal Institution, Smithsonian Institution, Princeton University, and the International Centre for Theoretical Physics.

Science communication and public outreach

Beyond research, he engaged in science popularization through books, lectures, and media appearances, collaborating with organizations such as the National Council for Science and Technology Communication, All India Radio, Doordarshan, and science museums like the Nehru Planetarium and science centers in Bengaluru, Delhi, and Kolkata. He authored accessible works and articles that addressed audiences at institutions including Indian Institute of Science, Indian Institutes of Technology, Jawaharlal Nehru University, and international venues at Cambridge University Press events and Oxford symposia, intersecting with communicators who worked with Carl Sagan, Richard Dawkins, E. C. George Sudarshan, and A. P. J. Abdul Kalam in public engagement.

Personal life and legacy

His family ties and mentorship shaped academic lineages in Indian astrophysics, with protégés and collaborators placed across Tata Institute of Fundamental Research, Inter-University Centre for Astronomy and Astrophysics, Pune University, IISc Bangalore, and international centers in Cambridge, Princeton, and Caltech. His legacy is reflected in institutional development, curricular contributions at universities like Mumbai University and Savitribai Phule Pune University, and ongoing debates in cosmology alongside work by Jim Peebles, Stephen Hawking, Roger Penrose, and Fred Hoyle. He remains cited in discussions held at forums including the Royal Society, International Astronomical Union, American Physical Society, European Physical Society, and in historiography involving figures such as S. Chandrasekhar and Hermann Bondi.

Category:Indian astrophysicists Category:1938 births Category:Living people