2402:3A80:CAB:72B0:BBDE:1FE4:C9E:4A2D at 05:17, 11 August 2021

2021-08-11T05:17:16Z

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{{short description|Indian theoretical physicist (born 1951)}}
{{Use dmy dates|date=October 2018}}
{{Use Indian English|date=October 2018}}
{{Infobox scientist
| name = Deepak Dhar
| image =
| alt =
| caption =
| birth_date = {{Birth date and age|1951|10|30|df=y}}
| birth_place = [[Pratapgarh, Uttar Pradesh]], India
| death_date =
| death_place =
| residence = [[Pune]], [[Maharashtra]], India
| nationality = [[Indian nationality|Indian]]
| fields = {{ublist | [[Theoretical physics]] }}
| workplaces = {{ublist | [[Indian Institute of Science Education and Research, Pune]] [[Tata Institute of Fundamental Research]] | [[University of Paris]] }}
| alma_mater = {{ublist | [[University of Allahabad]] | [[IIT Kanpur]] | [[California Institute of Technology]] }}
| doctoral_advisor = {{ublist | [[Jon Mathews]] }}
| doctoral_students = [[Abhishek Dhar]]
| known_for = Studies on [[statistical physics]] and [[stochastic processes]]
| awards = {{ublist| 1983 [[Indian National Science Academy|INSA]] Young Scientist Medal | 1991 [[Shanti Swarup Bhatnagar Prize]] | 1993 [[International Centre for Theoretical Physics|ICTP]] J. Robert Schrieffer Prize |
2001 [[Indian National Science Academy|INSA]] S. N. Bose Medal | 2002 [[TWAS Prize]] | [[Indian Institute of Technology Kanpur|IITK]] Distinguished Alumni Award }}
}}
'''Deepak Dhar''' (born 30 October 1951) is an Indian theoretical physicist and a distinguished professor at the department of physics of [[Indian Institute of Science Education and Research, Pune]]. Known for his research on [[statistical physics]] and [[stochastic processes]], Dhar is an elected fellow of all the three major Indian science academies – [[Indian Academy of Sciences]], [[Indian National Science Academy]] and [[National Academy of Sciences, India]] – as well as of [[The World Academy of Sciences]]. The [[Council of Scientific and Industrial Research]], the apex agency of the Government of India for scientific research, awarded Dhar the [[Shanti Swarup Bhatnagar Prize for Science and Technology]], one of the highest Indian science awards, for his contributions to physical sciences in 1991.<ref name="View Bhatnagar Awardees">{{cite web | url=http://ssbprize.gov.in/Content/AwardeeList.aspx | title=View Bhatnagar Awardees | publisher=Shanti Swarup Bhatnagar Prize | date=2016 | access-date=12 November 2016}}</ref>{{Refn|group=note|Long link – please select award year to see details}}

== Biography ==
[[File:Au science faculty.jpg|thumb|235px|right|University of Allahabad]]
Born on 30 October 1951 at [[Pratapgarh, Uttar Pradesh|Pratapgarh]], in the north Indian state of [[Uttar Pradesh]] to Murli Dhar-Rama Gupta couple, Deepak Dhar graduated in science from the [[University of Allahabad]] in 1970 before earning a master's degree in physics from the [[Indian Institute of Technology, Kanpur]] in 1972.<ref name="Curriculum vitae on TIFR">{{Cite web |url=http://theory.tifr.res.in/~ddhar/cv2016.pdf |title=Curriculum vitae on TIFR |date=2017 |publisher=Tata Institute of Fundamental Research |access-date=2017-10-22}}</ref> Moving to the US, he enrolled for his doctoral studies under the guidance of [[Jon Mathews]] at [[California Institute of Technology]], and after securing a PhD in 1978,<ref name="Dr. Deepak Dhar Professor">{{Cite web |url=https://vidwan.inflibnet.ac.in/profile/13695 |title=Dr. Deepak Dhar Professor |date=2017 |publisher=Expert Database and National Researcher Network}}</ref> returned to India to start his career as a research fellow at [[Tata Institute of Fundamental Research]] (TIFR) the same year.<ref name="Indian fellow">{{Cite web |url=http://insaindia.res.in/detail/N95-1172 |title=Indian fellow |date=2017 |publisher=Indian National Science Academy}}</ref> After two years of research, Dhar became a full-time fellow in 1980 and served in that position until 1986 when he was promoted as a reader. Before his superannuation from regular service, Dhar held various positions at TIFR such as that of an associate professor (1991) and professor grades from G to J (1995–2008). In between, he had a one-year sabbatical at the [[University of Paris]] as a visiting scientist during 1984–85) and a month-long stint at [[Isaac Newton Institute]] in May 2006 as a Rothschild Professor. Post-retirement, Dhar continues his association with TIFR as a distinguished professor of the institution.<ref name="Home Page of Deepak Dhar at TIFR">{{Cite web |url=http://theory.tifr.res.in/~ddhar/ |title=Home Page of Deepak Dhar at TIFR |date=2017 |publisher=Tata Institute of Fundamental Research}}</ref> He also serves as a distinguished visiting faculty at the [[Indian Institute of Science Education and Research, Pune]].<ref name="Faculty details">{{Cite web |url=http://www.iiserpune.ac.in/people/faculty-details/171 |title=Faculty details |date=2017 |publisher=Indian Institute of Science Education and Research, Pune}}</ref>

Dhar is married to Manju and the couple has two children. The family lives in TIFR Housing Colony along Homi Bhabha Road in Mumbai.<ref name="NASI fellows">{{Cite web |url=http://www.nasi.org.in/fellows.asp?RsFilter=D |title=NASI fellows |date=2017 |publisher=National Academy of Sciences, India |url-status=dead |archive-url=https://web.archive.org/web/20150717020647/http://www.nasi.org.in/fellows.asp?RsFilter=D |archive-date=2015-07-17 }}</ref>

== Legacy ==
[[File:BMonSphere.jpg|thumb|A computer-simulated realization of a [[Wiener process|Wiener or Brownian motion process]] (a [[continuous-time]] [[stochastic process]]) on the surface of a sphere]]
Focusing his studies on [[statistical physics]] and [[stochastic processes]], Dhar has worked on the [[statistical mechanics]] and kinetics of random [[Lattice model (physics)|lattices]] and his work is reported to have widened our understanding of the disciplines.<ref name="Brief Profile of the Awardee">{{Cite web |url=http://ssbprize.gov.in/content/Detail.aspx?AID=182 |title=Brief Profile of the Awardee |date=2017 |publisher=Shanti Swarup Bhatnagar Prize |access-date=12 November 2016}}</ref> He is credited with the introduction of ''spectral dimension'' concept in the studies of [[fractals]] and contributed to developing a methodology for determining their [[critical phenomena]] using real-space [[renormalization group]] techniques which was the first time the mathematical apparatus was used for calculations on ''nontrivial critical exponents'' on fractals.<ref name="Indian fellow" /> Dhar worked with [[Ramakrishna Ramaswamy]] to solve the [[Abelian sandpile model]] of [[self-organized criticality]]<ref name="ICTP Prize Winner 1993">{{Cite web |url=https://www.ictp.it/about-ictp/prizes-awards/the-ictp-prize/the-prize-winners/ictp-prize-winner-1993.aspx |title=ICTP Prize Winner 1993 |date=2017 |publisher=International Centre for Theoretical Physics}}</ref> and developed a new model<ref name="Exactly solved model of self-organized critical phenomena">{{Cite journal |last=Deepak Dhar, Ramakrishna Ramaswamy |title=Exactly solved model of self-organized critical phenomena |journal=Phys. Rev. Lett. |date=1989 |volume=63 |issue=1659 |pages=1659–1662 |doi=10.1103/PhysRevLett.63.1659|pmid=10040637 |bibcode=1989PhRvL..63.1659D }}</ref> which came to be known as ''Dhar-Ramaswamy model''.<ref name="A dynamical programming approach for controlling the directed abelian Dhar-Ramaswamy model">{{cite report |arxiv= 1305.6668 |title= A dynamical programming approach for controlling the directed abelian Dhar-Ramaswamy model |last=Daniel O. Cajueiro, Roberto F. S. Andrade |date=May 2013 |publisher= Physical Review E, Statistical, Nonlinear, and Soft Matter Physics |bibcode=2010PhRvE..82c1108C }}</ref> Working on ''directed-site animals-enumeration problem''<ref name="Handbook of Shanti Swarup Bhatnagar Prize Winners">{{cite web |url= http://www.csirhrdg.res.in/ssb.pdf |title= Handbook of Shanti Swarup Bhatnagar Prize Winners |publisher= Council of Scientific and Industrial Research |date= 1999 |access-date= 20 May 2017 |archive-url= https://web.archive.org/web/20160304043957/http://www.csirhrdg.res.in/ssb.pdf |archive-date= 4 March 2016 |url-status= dead }}</ref> using [[Bethe ansatz]] method, he proposed the evolution operator which has since been subjected to studies by other researchers as ''Dhar directed-site animals-enumeration problem''.<ref name="On the Dhar directed-site animals-enumeration problem for the simple cubic lattice">{{Cite journal |last=G. S. Joyce |title=On the Dhar directed-site animals-enumeration problem for the simple cubic lattice |journal=Journal of Physics A: Mathematical and General |date=1989 |volume=22 |issue=19 |pages=L919–L924 |doi=10.1088/0305-4470/22/19/001|bibcode=1989JPhA...22L.919J }}</ref><ref name="Enumeration of directed animals on an infinite family of lattices">{{Cite journal |last=Mireille Bousquet-Mélou, Andrew R Conway |title=Enumeration of directed animals on an infinite family of lattices |journal=Journal of Physics A: Mathematical and General |date=1996 |volume=29 |issue=13 |pages=L919–L924 |doi=10.1088/0305-4470/22/19/001|bibcode=1989JPhA...22L.919J }}</ref> Dhar also demonstrated the predominance of slow flipping of ''isolated unfrustrated clusters'' in auto-correlation functions and proposed models of metastable glassy states in stochastic evolution.<ref name="Indian fellow" /> His studies have been documented by way of a number of articles<ref name="On ResearchGate">{{Cite web |url=https://www.researchgate.net/profile/Deepak_Dhar/publications |title=On ResearchGate |date=2017 }}</ref><ref name="On Google Scholar">{{Cite web |url=https://scholar.google.co.in/citations?user=dl1wQfwAAAAJ&hl=en |title=On Google Scholar |date=2017 |publisher=Google Scholar}}</ref>{{Refn|group=note|Please see ''Selected bibliography'' section}} and the online article repository of Indian Academy of Sciences has listed 113 of them.<ref name="Browse by Fellow">{{Cite web |url=http://repository.ias.ac.in/view/fellows/Dhar=3ADeepak=3A=3A.html |title=Browse by Fellow |date=2017 |publisher=Indian Academy of Sciences}}</ref>

Dhar is an associate editor of [[Journal of Statistical Physics]], a [[Springer Science+Business Media|Springer]] publication since 2005 where he sat in the editorial board on two previous terms (1993–96 and 1999–2002).<ref name="Journal of Statistical Physics">{{Cite web |url=https://www.springer.com/physics/complexity/journal/10955?detailsPage=editorialBoard |title=Journal of Statistical Physics |date=2017 |publisher=Springer}}</ref> He is an editorial board member of the ''Indian Journal of Pure and Applied Physics'' (IJPAP) of the [[National Institute of Science Communication and Information Resources]] (NISCAIR),<ref name="Editorial Board IJPAP">{{Cite web |url=http://www.niscair.res.in/sciencecommunication/researchjournals/rejour/ijpap/ijpap0_march07.asp |title=Editorial Board IJPAP |date=2017 |publisher=National Institute of Science Communication and Information Resources}}</ref> a former editorial adviser to [[Physica A]], an [[Elsevier]] science journal, and has been associated with journals such as ''Journal of Statistical Mechanics: Theory and Experiment'', [[Physical Review E]] and [[Pramana (journal)|Pramana]] as an editorial board member. He was a member of the ''Commission on Statistical Physics'' of the [[International Union of Pure and Applied Physics]] from 1992 to 1995<ref name="Curriculum vitae on TIFR" /> and is a member of the program committee of the [[International Centre for Theoretical Sciences]].<ref name="ICTS Program committee">{{Cite web |url=https://www.icts.res.in/people/deepak-dhar |title=ICTS Program committee |date=2017 |publisher=International Centre for Theoretical Sciences}}</ref> Dhar has also delivered invited speeches and the special lecture on ''The Curious Relationship Between Physics and Mathematics'' at the University of Mumbai on 19 October 2016 was one among them.<ref name="Special lecture">{{Cite web |url=http://mu.ac.in/portal/wp-content/uploads/2014/04/noticephysics.pdf |title=Special lecture |date=2016 |publisher=University of Mumbai}}</ref>

== Awards and honors ==
During his doctoral days at [[California Institute of Technology|Caltech]], Dhar held two institutional fellowships; E. P. Anthony fellowship (1972–73) and R. P. Feynman fellowship (1974–76).<ref name="Curriculum vitae on TIFR" /> He received the Young Scientist Medal of the Indian National Science Academy in 1983.<ref name="Young Scientists Medal">{{Cite web |url=http://insaindia.res.in/youngmedal.php |title=Young Scientists Medal |date=2017 |publisher=Indian National Science Academy}}</ref> The Council of Scientific and Industrial Research awarded him the [[Shanti Swarup Bhatnagar Prize]], one of the highest Indian science awards in 1991.<ref name="CSIR list of Awardees">{{Cite web |url=http://www.csir.res.in/careeraward/prize-winner-indexdiscipline-wise |title=CSIR list of Awardees |date=2017 |publisher=Council of Scientific and Industrial Research}}</ref> Two year's later, [[International Centre for Theoretical Physics]] selected him for the 1993 J. Robert Schrieffer Prize.<ref name="ICTP Prize Winner 1993" /> INSA honored Dhar again in 2001 with the Satyendranath Bose Medal<ref name="Satyendranath Bose Medal">{{Cite web |url=http://insaindia.res.in/recipients.php |title=Satyendranath Bose Medal |date=2017 |publisher=Indian National Science Academy}}</ref> and he received the [[TWAS Prize]] of [[The World Academy of Sciences]] in 2002.<ref name="Recipients of TWAS Awards and Prizes">{{Cite web |url=https://twas.org/recipients-twas-awards-and-prizes |title=Recipients of TWAS Awards and Prizes |date=2017 |publisher=The World Academy of Sciences}}</ref>

Dhar was elected as a fellow by the Indian Academy of Sciences in 1990 where he is a sitting council member.<ref name="Fellow profile">{{Cite web |url=http://www.ias.ac.in/describe/fellow/Dhar,_Prof._Deepak |title=Fellow profile |date=2017 |publisher=Indian Academy of Sciences}}</ref> He became an elected fellow of the Indian National Science Academy on 1995<ref name="INSA Year Book 2016">{{Cite web |url=http://www.insaindia.res.in/pdf/YearBook_2016.pdf |title=INSA Year Book 2016 |date=2017 |publisher=Indian National Science Academy |access-date=20 May 2017 |archive-url=https://web.archive.org/web/20161104001952/http://www.insaindia.res.in/pdf/YearBook_2016.pdf |archive-date=4 November 2016 |url-status=dead }}</ref> and the National Academy of Sciences, India elected him as a fellow in 1999.<ref name="NASI Year Book 2015">{{Cite web |url=http://www.nasi.org.in/Year%20Book%202015.pdf |title=NASI Year Book 2015 |date=2017 |publisher=National Academy of Sciences, India |url-status=dead |archive-url=https://web.archive.org/web/20150806211716/http://www.nasi.org.in/Year%20Book%202015.pdf |archive-date=2015-08-06 }}</ref> Dhar received the elected fellowship of the World Academy of Sciences in 2006<ref name="TWAS fellow">{{Cite web |url=https://twas.org/member/dhar-deepak |title=TWAS fellow |date=2017 |publisher=The World Academy of Sciences}}</ref> and was selected for the J. C. Bose National fellowship of the [[Science and Engineering Research Board]] in 2007, with the tenure running until 2017.<ref name="Curriculum vitae on TIFR" />

== Selected bibliography ==
* {{Cite journal |last=Deepak Dhar |title=Exact Solution of a Directed-Site Animals-Enumeration Problem in Three Dimensions |journal=Phys. Rev. Lett. |date=1983 |volume=51 |issue=10 |pages=853–856 |doi=10.1103/PhysRevLett.51.853|bibcode=1983PhRvL..51..853D }}
* {{Cite journal |last=Deepak Dhar, Ramakrishna Ramaswamy |title=Exactly solved model of self-organized critical phenomena |journal=Phys. Rev. Lett. |date=1989 |volume=63 |issue=1659 |pages=1659–1662 |doi=10.1103/PhysRevLett.63.1659|pmid=10040637 |bibcode=1989PhRvL..63.1659D }}
* {{Cite journal |last=D Dhar, S N Majumdar |title=Abelian sandpile model on the Bethe lattice |journal=Journal of Physics A: Mathematical and General |date=1990 |volume=23 |issue=4333 |pages=4333–4350 |doi=10.1088/0305-4470/23/19/018|bibcode=1990JPhA...23.4333D |citeseerx=10.1.1.727.7377 }}
* {{Cite journal |last=Deepak Dhar |title=Self-organized critical state of sandpile automaton models |journal=Phys. Rev. Lett. |date=1990 |volume=64 |issue=14 |pages=1613–1616 |doi=10.1103/PhysRevLett.64.1613|pmid=10041442 |bibcode=1990PhRvL..64.1613D }}
* {{Cite journal |last=Deepak Dhar |title=The Abelian sandpile and related models |journal=Physica A: Statistical Mechanics and Its Applications |date=1999 |volume=263 |issue=1–4 |pages=4–25 |doi=10.1016/S0378-4371(98)00493-2|arxiv=cond-mat/9808047 |bibcode=1999PhyA..263....4D |s2cid=11091203 }}

== See also ==
{{Div col|colwidth=30em}}
* [[Lattice model (physics)]]
{{div col end}}
{{portal|India|Physics}}

== Notes ==
{{Reflist|group=note|2}}

== References ==
{{Reflist}}

== External links ==
* {{Cite web |url=https://www.youtube.com/watch?v=30WNNl5Fj7s |title=Directed percolation and Sandpile models |last=Deepak Dhar |date=8 July 2015 |publisher=International Centre for Theoretical Sciences |work=Presentation at Bangalore School on Statistical Physics}}

{{SSBPST recipients in Physical Science}}
{{Authority control}}

{{DEFAULTSORT:Dhar, Deepak}}
[[Category:1951 births]]
[[Category:People from Pratapgarh district, Uttar Pradesh]]
[[Category:Scientists from Uttar Pradesh]]
[[Category:Indian scientific authors]]
[[Category:Indian theoretical physicists]]
[[Category:University of Allahabad alumni]]
[[Category:Indian Institute of Technology Kanpur alumni]]
[[Category:California Institute of Technology alumni]]
[[Category:Tata Institute of Fundamental Research faculty]]
[[Category:University of Paris faculty]]
[[Category:TWAS fellows]]
[[Category:Fellows of The National Academy of Sciences, India]]
[[Category:Fellows of the Indian Academy of Sciences]]
[[Category:Fellows of the Indian National Science Academy]]
[[Category:TWAS laureates]]
[[Category:Recipients of the Shanti Swarup Bhatnagar Award in Physical Science]]
[[Category:Living people]]
[[Category:20th-century Indian physicists]]

Deepak Dhar - Revision history

2402:3A80:CAB:72B0:BBDE:1FE4:C9E:4A2D at 05:17, 11 August 2021