Which of the following best describes the 'Abelian' property in the context of the Abelian sandpile model?

The final shape of the pile is independent of the sequence in which grains topple.

The model is only applicable to systems with a finite number of particles.

The pile grows indefinitely without ever reaching a critical state.

The system requires external energy to maintain its critical state.

The ICTP Dirac Medal is awarded to physicists who have made outstanding contributions to theoretical physics, with the specific exclusion of which of the following?

Recipients of the Shanti Swarup Bhatnagar Prize.

Recipients of the Boltzmann Medal.

Recipients of the Padma Bhushan.

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13 August 2026

Deepak Dhar and the Dirac Medal

The achievement of an Indian scientist in a prestigious international award serves as a relevant example of India's progress in science and technology for essay or answer enrichment.

Notes

Deepak Dhar awarded the 2024 Dirac Medal for contributions to statistical physics, sharing the honour with Bernard Derrida, Marc Mézard, and Haim Sompolinsky.
The Dirac Medal is awarded annually by the International Centre for Theoretical Physics (ICTP) in Trieste, Italy, on Paul A.M. Dirac's birthday.
The medal recognizes outstanding contributions to theoretical physics; recipients must not have previously received a Nobel Prize, Fields Medal, or Wolf Prize.
Dhar is the second Indian to win the Dirac Medal, following Ashoke Sen (2012).
Dhar is best known for his work on the 'Abelian sandpile model', a mathematical framework for 'self-organised criticality'.
Self-organised criticality describes systems that build up instability and release it in unpredictable ways, applicable to earthquakes, forest fires, neural networks, and financial markets.
The 'Abelian' property ensures that regardless of the sequence of grain toppling, the pile reaches the same final state, allowing for exact mathematical predictions.
Dhar's career includes research at the Tata Institute of Fundamental Research (TIFR), IISER Pune, and the International Centre for Theoretical Sciences (ICTS), Bengaluru.
Dhar's other major awards include the Shanti Swarup Bhatnagar Prize (1991), the Boltzmann Medal (2022), and the Padma Bhushan (2023).
The ICTP was founded in 1964 by Abdus Salam to facilitate collaboration between scientists from the Global South and the international community.

Questions

What is the concept of 'self-organised criticality' in statistical physics? Discuss its significance in modelling complex natural and social phenomena. 150 words

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The contributions of Indian scientists to theoretical physics have been globally recognised through prestigious international awards. Discuss the role of institutions like the ICTP in fostering scientific collaboration and the importance of statistical mechanics in understanding complex systems. 250 words

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Prelims

Which of the following best describes the 'Abelian' property in the context of the Abelian sandpile model?

The ICTP Dirac Medal is awarded to physicists who have made outstanding contributions to theoretical physics, with the specific exclusion of which of the following?

Syllabus

Achievements in science & technology: indigenization, new technology GS3

Topics

Sources

The work that won Deepak Dhar the Dirac Medal

250words.in · https://250words.in/daily/2026-08-13/deepak-dhar-and-the-dirac-medal