Raj Pathria

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Raj Kumar Pathria
Born (1933-03-30) March 30, 1933 (age 82)
Ramdas near Amritsar, India
Residence San Diego, US
Nationality US, Canadian
Fields Mathematical Physics, Statistical Mechanics, Theory of Relativity
Institutions University of Delhi
McMaster University
University of Alberta
Panjab University
University of Waterloo
University of Windsor
University of California at San Diego
Alma mater Panjab University
University of Delhi
Doctoral advisors F. C. Auluck
D. S. Kothari

Professor Raj Kumar Pathria (born March 30, 1933) is a theoretical physicist and an Urdu poet.

Pathria is known for his work on Superfluidity in liquid helium, Lorentz transformation of thermodynamic quantities, a rigorous evaluation of lattice sums and finite-size effects in phase transitions.

Pathria is also the author of a well-known graduate text book on Statistical Mechanics,[1] which has recently appeared in its third edition. He also wrote a book on Relativity that has been published in a Dover edition.[2]

Early life[edit]

Raj Kumar Pathria was born in a middle class Punjabi family to parents Ramji Das Pathria and Mela Devi Pathria. He is married to a former student of his named Raj Kumari.

Raj Pathria received his early education in a local high school in Ramdas – named "Baba Buddha Khalsa High School" --- where he passed his matriculation examination in 1948, breaking all previous records held at that school.

He then joined the Hindu College, Amritsar, where he had the privilege of being not only a classmate but also a good friend of Manmohan Singh (who is former Prime Minister of India). For record's sake, while Raj was a constant topper in the Science faculty of that college, Manmohan was so in the Arts faculty.


Raj Pathria obtained his BSc Honours and MSc Honours degrees from Panjab University, Hoshiarpur in July 1953 and July 1954, respectively, and soon thereafter, at the invitation of Professor F.C. Auluck, joined the graduate school of Physics at the University of Delhi for his doctoral studies – which he completed in March 1957. In February 1958, he joined the University of Delhi as a Lecturer in Physics and in April 1961 got promoted to Readership. In August 1964, he left Delhi to take up a 'Visiting Professorship' at McMaster University in Canada.

Even though his field of research at the University of Delhi was primarily Statistical Mechanics, Pathria, during that time, got fascinated with the subject of relativity and in 1963, with the friendly cooperation of the Hindustan Book Agency, produced a book entitled Theory of Relativity. This maiden attempt at book-writing resulted in fabulous reviews from far and wide, especially from Professor William McCrea – who himself was a celebrated author on this subject. In 1974, the Pergamon Press, Oxford produced a second edition of that book and in 2003 Dover Publications of New York took that book under their wings .

In Canada, Pathria continued his research in the diverse field of 'Statistical Mechanics'; at the same time, he gave graduate courses on that subject at McMaster University, Hamilton and the University of Alberta, Edmonton. In 1967, he returned to India to take up Professorship of Theoretical Physics at the Panjab University, Chandigarh where (apart from conducting research in a variety of subjects in Mathematical Physics) he continued his mission teaching the fundamentals of Statistical Mechanics.

In 1969, Pathria returned to Canada and, in addition to his other academic pursuits, continued to teach a variety of courses at the University of Waterloo and the University of Windsor. In 1972 the Pergammon Press, Oxford published his classic text on Statistical Mechanics which became an instant success on the international scene.

In the early nineties, when his new publishers (Butterworth-Heinemann) persuaded Pathria to produce a second edition of this text, he sought the help of Surjit Singh, a former student of his from the Chandigarh days (who had also been a post-doctoral fellow with him at Waterloo during the years 1983–1987). The result of this joint effort was a brand new edition of this book that came out in July 1996 and, like its predecessor, continued to be a 'best-seller'.

The history repeated itself in the year 2009 when Pathria's newest publishers (Elsevier/Academic) prevailed upon him to produce a third edition of this book. He now sought the help of Paul Beale, of the University of Colorado at Boulder, whose co-authorship produced another brand new edition of this book in March 2011.

In between the last two events, Pathria retired from the University of Waterloo in August 1998 and, soon thereafter, moved to the west coast of the USA and became an 'Adjunct Professor of Physics' at the University of California at San Diego – a position he continues to hold till today.


  1. Fellowship of the American Physical Society, 1976
  2. Recipient of the "Distinguished Teacher award", University of Waterloo, 1977 – the citation for this award was presented at the UW convocation held on May 27, 1977
  3. Distinguished Professor Emeritus, University of Waterloo, 1999 – this honor was bestowed upon Professor Pathria at the UW convocation held on June 18, 1999

Research interests[edit]

Raj Pathria has published about 120 research papers in a variety of international journals of repute. These papers are mainly spread over the following topics.

  1. Superfluidity in liquid helium II – one of the topics of Pathria's PhD thesis, pursued in collaboration with S.M. Bhagat.
  2. Lorentz transformation of thermodynamic quantities – a major topic of Pathria's PhD thesis, pursued on his own.
  3. Polymers and the Theory of Numbers – a subject pursued in collaboration with V.S. Nanda.
  4. A statistical study of 'Random Numbers' – pursued independently.
  5. Finite-size effects in systems undergoing phase transitions – pursued in collaboration with A.D. Singh Nagi, Stanley Greenspoon, Chris Zasada, Scott Allen and, most importantly, Surjit Singh. It was Surjit Singh whose collaboration enabled Pathria to establish a unified view of the first-order and second-order phase transitions; it was the same collaboration that produced 22 joint research papers!
  6. A rigorous evaluation of 'lattice sums' using Poisson's summation formula – pursued in collaboration with A.N. Chaba and Surjit Singh.
  7. A study of 'stochastic phenomena in sociology' – pursued in collaboration with Karmeshu and C.L. Sharma.

Other interests[edit]

Apart from Mathematical Physics, the only hobbies Pathria has are contemporary affairs and Urdu poetry.

Right from his childhood, Pathria was nurtured in an atmosphere replete with Urdu language, Urdu idiom and Urdu poetry.

Having read, and imbibed, dozens of classics emanating from stalwarts like Mir, Ghalib, Zauq, Momin, Hali, Dagh and Iqbal, down to modernists like AsGhar, Fani, Hasrat, Jigar, Firaq and Faiz, Pathria finally turned to writing Urdu poetry himself – but only around the year 1993 when he was close to retirement from Physics.

Pathria – now pen-named 'Qais' (after the legendary lover of the Persian woman Laila) – somehow 'steals' almost any poetic symposium he happens to attend! Among literary circles, he is now known for his latest compilation of Urdu Ghazals entitled "Saihraa Saihraa",[3] which was published by M.R. Publications of Daryaganj, New Delhi, towards the end of the year 2005.

Personal life[edit]

As mentioned above, Raj Pathria is married to a former student of his – named Raj Kumari! Raj and Raj Pathria have two daughters – Mini (a bone radiologist in San Diego) and Dimpy (a computer scientist in Chicago) – and a son Anu (a software engineer in San Diego).

Pathrias are also blessed with five grandchildren – Max, Cam, Rita, Sonali and Sachin.