physics

Subir Sarkar

Subir Sarkar is a physics topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Subir Sarkar rather than just read about it. In short: Subir Sarkar (12 September 1953, Ichapore, India) is an Indian astroparticle physicist and cosmologist, known for his research on the dark sector and astroparticle physics. He has been at the Rudolf Peierls Centre for Theoretical Physics, Oxford University, since 1990, and was Head of the Oxford Particle Theory Group (2011-2019).

Key takeaways

Subir Sarkar belongs to physics; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Subir Sarkar to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Subir Sarkar from memory before moving on to harder problems.

Reference excerpt

Subir Sarkar (12 September 1953, Ichapore, India) is an Indian astroparticle physicist and cosmologist, known for his research on the dark sector and astroparticle physics. He has been at the Rudolf Peierls Centre for Theoretical Physics, Oxford University, since 1990, and was Head of the Oxford Particle Theory Group (2011-2019). He was also Niels Bohr Professor at the Niels Bohr Institute, University of Copenhagen (2013-2018). Since 2021, he has been Emeritus Professor and Emeritus Fellow of Linacre College, Oxford. He was on the Advisory Board of the Gruber Cosmology Prize from 2014 to 2020 and has served since 2021 on Commission C4 (Astroparticle Physics) of the International Union of Pure and Applied Physics.

Education and career After completing secondary school in 1969, Sarkar studied at IIT Kharagpur, where he graduated with a B.Sc. in 1972 and an M.Sc. in 1974. He then joined the Tata Institute of Fundamental Research (TIFR), where he was appointed as a research associate in the Cosmic Rays Group in 1979 and was awarded a PhD in Physics in 1982. In 1983, he was a visiting fellow at the International School for Advanced Studies (Scuola Internazionale Superiore di Studi Avanzati; SISSA) in Trieste and during 1984–1985 a research associate in CERN's Theory Division. For the academic year 1985–1986, he was a visiting fellow at the University of Oxford's Department of Astrophysics and during 1987–1988 a research associate in the HEP Theory Group of Rutherford Appleton Laboratory (RAL) in Chilton, Oxfordshire. From 1988 to 1989 he worked in Bhopal for an Indian NGO (Eklavya), specialising in science education and popularisation. In 1990 Sarkar became a staff member of the University of Oxford's Rudolf Peierls Centre for Theoretical Physics. He was a visiting scholar at Wolfson College, Oxford from 1991 to 1993 and a research fellow from 1993 to 1997. During 1997-1998, he was a departmental lecturer and a tutor in physics at Pembroke College, Oxford. He was appointed as a University lecturer in 1998, promoted to reader in 2000, and professor in 2006, retiring as professor emeritus in 2021. Sarkar headed the Oxford Particle Theory Group from 2011 to 2019. He has also been an adjunct faculty member at TIFR and at the Raman Research Institute, Bangalore. Sarkar's research deals with relations between fundamental physics and aspects of astrophysics and cosmology and has a wide range, including dark matter, primordial nucleosynthesis, cosmological phase transitions, cosmological inflation, large-scale structure of the universe, and problems with the ΛCDM model. He has also participated in experiments such as the Pierre Auger Observatory, the Big European Bubble Chamber (BEBC), the IceCube Neutrino Observatory, and the Cherenkov Telescope Array in investigations of very high energy cosmic rays and neutrinos. He is a member of the Dark Energy Science Collaboration of the Vera C. Rubin Observatory. He was a founder member of the India Oxford Initiative, which began funding projects in 2019.

Personal life Subir Sarkar is married to Amanda Cooper-Sarkar, a particle physicist in the Department of Physics, Oxford University.

Awards and honours In 2017, Sarkar was awarded the Homi Bhabha Medal and Prize. In 2021, he shared the Bruno Rossi Prize awarded to Francis Halzen and the IceCube collaboration. Sarkar's collaborators and former students held a celebration from 11 to 13 September 2023 in honour of his career achievements and his 70th birthday.

Selected publications Sarkar, Subir (2004). "New physics from ultrahigh energy cosmic rays". Acta Physica Polonica B. 35: 351–364. arXiv:hep-ph/0312223. Sarkar, Subir (2018). "Is dark matter self-interacting?". Nature Astronomy. 2: 856–857. arXiv:hep-ph/0202013. Abel, S.A.; Sarkar, S.; White, P.L. (1995). "On the cosmological domain wall problem for the minimally extended supersymmetric standard model". Nuclear Physics B. 454 (3): 663–681. arXiv:hep-ph/9506359. Bibcode:1995NuPhB.454..663A. doi:10.1016/0550-3213(95)00483-9. Sarkar, Subir (1996). "Big bang nucleosynthesis and physics beyond the standard model". Reports on Progress in Physics. 59 (12): 1493–1609. arXiv:hep-ph/9602260. Bibcode:1996RPPh...59.1493S. doi:10.1088/0034-4885/59/12/001. Birkel, Michael; Sarkar, Subir (1998). "Extremely high energy cosmic rays from relic particle decays". Astroparticle Physics. 9 (4): 297–309. arXiv:hep-ph/9804285. Bibcode:1998APh.....9..297B. doi:10.1016/S0927-6505(98)00028-0. Sarkar, Subir (2002). "Possible Astrophysical Probes of Quantum Gravity". Modern Physics Letters A. 17 (15n17): 1025–1035. arXiv:gr-qc/0204092. Bibcode:2002MPLA...17.1025S. doi:10.1142/S0217732302007521. Beyer, Konstantin A.; Sarkar, Subir (2023). "Ruling out light axions: The writing is on the wall". SciPost Physics. 15 (1): 003. arXiv:2211.14635. Bibcode:2023ScPP...15....3B. doi:10.21468/SciPostPhys.15.1.003.

References

External links The universe may be lopsided – new research, The Conversation, December 22, 2025

Illustrations

Worked examples

Example 1 — a first encounter with Subir Sarkar

Start with the simplest possible case. Write down what Subir Sarkar claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In physics, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Subir Sarkar before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Subir Sarkar ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Subir Sarkar

In research: Subir Sarkar appears in physics research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Subir Sarkar in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Subir Sarkar is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1953 births, 20th-century Indian physicists, 21st-century Indian physicists, so understanding it makes those chapters shorter.
In everyday life: Look for Subir Sarkar outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Subir Sarkar in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Subir Sarkar means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Subir Sarkar out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Subir Sarkar in simple terms?

Why does Subir Sarkar matter?

Because it connects several physics ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Subir Sarkar?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Subir Sarkar.