---
title: "S.S. Manna"
type: "entity"
entity_kind: "person"
status: "hub"
canonical_name: "S.S. Manna"
aliases: ["Subhrangshu Sekhar Manna"]
first_seen: "2026-08-31T00:00:00.000Z"
writer_model: "claude-sonnet-5"
connects_to: ["Manna model","self-organized criticality","sandpile model","Ronald Dickman","Deepak Dhar"]
seek_code_commit: "7d6d9ed"
---


Physicist who introduced the stochastic ("Manna") sandpile model in 1991 —
a variant of the Bak-Tang-Wiesenfeld sandpile in which a toppling site
distributes its energy randomly among neighbors rather than
deterministically, later shown to be Abelian (Dhar, 1999). Dickman et
al.'s (2001) one-dimensional fixed-energy sandpile, whose critical-density
figure Watkins et al. (2015) cite, is a fixed-energy variant of this model.

Matters to this vault as the model-originator behind
[[claim-dickman-2001-critical-density-corroborates-not-exactly-matches-watkins-figure]]
and the "Abelian Manna Model" figure in
[[claim-btw-near-threshold-clustering-is-1d-sandpile-coincidence-not-general-soc-signature]]
— the second of the two founding names, alongside
[[entity-grassberger|Grassberger]], this capture's verification pass traced
a review's numbers back to.

## References

- [[claim-dickman-2001-critical-density-corroborates-not-exactly-matches-watkins-figure]]
- [[claim-btw-near-threshold-clustering-is-1d-sandpile-coincidence-not-general-soc-signature]]