Sutanu Roy

Designation

Reader-F

Joining Date

12/09/2016

Expiry of Tenure

31/10/2050

Research Area

Functional Analysis

Education

B.Sc. : From Scottish Church College, University of Calcutta, India in 2006.
M.Sc. : From the Indian Institute of Technology Guwahati, India in 2009.
- Project title: Chain Conditions on Rings and Modules.
- Supervisor: Professor Anupam Saikia.
Dr. rer. nat. : From the Georg-August-Universität Göttingen, Germany in 2013.
- Thesis Title: C*-quantum groups with projection.
- Supervisor: Professor Ralf Meyer.

Postdoctoral positions:

Visiting Scientist in the Statistics and Mathematics Unit, Indian Statistical Institute Kolkata during July -- September, 2016 and September -- December 2014, with Debashish Goswami.
Fields-Ontario Postdoctoral fellow in the
- Fields Institute during January -- June, 2014.
- Department of Mathematics and Statistics, University of Ottawa during January -- June, 2015 with Benoît Collins.
- School of Mathematics and Statistics, Carleton University during July, 2015 -- June, 2016 with Matthias Neufang.
Postdoctoral fellow in the DFG Reserch Training Group 1493 at the Mathematisches Institut, Georg-August-Universität Göttingen during October -- December, 2013 with Ralf Meyer.

Employment:

Reader-F in the School of Mathematical Sciences (SMS), National Institute of Science Education and Research (NISER) Bhubaneswar, from July 2019.
Assistant Professor in the School of Mathematical Sciences (SMS), National Institute of Science Education and Research (NISER) Bhubaneswar, from September 2016 to June 2019.

Research Interest

Quantum Groups, Quantum Symmetry, Noncommutative Geometry, Operator Algebras.

Awards

CNRS visiting researcher at the Laboratoire de mathématiques de Besançon for two months during September and November, 2022.
Indian National Science Academy (INSA) Medal for Young Scientists in 2020.
Early Career Research Award (ECRA) by Science and Engineering Research Board (SERB), Department of Department of Science and Technology (DST), Govt. of India in 2017.
NBHM postdoctoral fellowship in 2016 (not availed).
Inspire faculty award by Department of Department of Science and Technology (DST), Govt. of India in 2016 (Session-I).
Fields–Ontario Postdoctoral fellowship from The Fields Institute during January 2014 to June 2016 (with an academic leave from July to December 2014).
Start-Up postdoctoral scholarship from he DFG research training group 1493 “Mathematical Structures in Modern Quantum Physics” at the Georg-August-Universität Göttingen during October 2013 to December 2013.
Doctoral stipend from the DFG research training group 1493 “Mathematical Structures in Modern Quantum Physics” at the Georg-August-Universität Göttingen during October 2010 to September 2013.
Qualification stipend from the DFG research training group 1493 “Mathematical Structures in Modern Quantum Physics” at the Georg-August-Universität Göttingen during October 2009 to September 2010.
UGC-CSIR (NET) fellowship in Mathematical Sciences with Rank-30 in 2009.
Institute Silver Medal on 11th convocation in 2009 for securing the 1st position in M.Sc. Mathematics and Computing.
Merit-cum-means scholarship for securing first position in the first year of M.Sc. during 2008-2009 (not availed).
Institute merit scholarship for securing first position in the first year of M.Sc. during 2008-2009.

Publications

Sutanu Roy, Braided quantum groups and their Bosonizations in the C*-algebraic framework, Int. Math. Res. Not. IMRN 14 (2023), 11791--11828 (and corrections)
Ralf Meyer, Sutanu Roy, Braided free orthogonal quantum groups, Int. Math. Res. Not. IMRN 12 (2022), 8890-8915
Atibur Rahaman, Sutanu Roy, Quantum E(2) groups for complex deformation parameters, Rev. Math. Phys. 33 (2021), no. 6, 2150021, 28 pp.
Deeptak Biswas, Kishan Deka, Amaresh Jaiswal, Sutanu Roy, Dynamics of QCD matter-current status, Internat. J. Modern Phys. E, 30 (2021), no. 02, 2130001
Sumana Bhattacharyya, Amaresh Jaiswal, Sutanu Roy, Chemical freeze-out systematics of thermal model analysis using hadron yield ratios, Phys. Rev. C 103 (2021), no. 2, 024905
Deeptak Biswas, Kishan Deka, Amaresh Jaiswal, Sutanu Roy, Viscosity, nonconformal equation of state, and sound velocity in Landau hydrodynamics, Phys. Rev. C 102 (2020), no. 1, 014912
Ralf Meyer, Sutanu Roy, Braided multiplicative unitaries as regular objects, Adv. Stud. Pure Math. 80 (2019), 151--178
Jyotishman Bhowmick, Arnab Mandal, Sutanu Roy, Adam Skalski, Quantum symmetries of the twisted tensor products of C*-algebras, Commun. Math. Phys. 368 (2019), no. 3, 1051-1085
Sutanu Roy, Stanisław Lech Woronowicz, Landstad-Vaes theory for locally compact quantum groups, Internat. J. of Math. 29 (2018), no. 4, 1850028, 36 pp.
Sutanu Roy, Thomas Timmermann, The maximal quantum group-twisted tensor product of C*-algebras, J. Noncommut. Geom. 12 (2018), no. 1, 279-330
Debashish Goswami, Sutanu Roy, Faithful actions of locally compact quantum groups on classical spaces, Lett. Math. Phys. 107 (2017), no. 7, 1375-1390
Ralf Meyer, Sutanu Roy, Stanisław Lech Woronowicz, Semidirect products of C*-quantum groups: multiplicative unitaries approach, Commun. Math. Phys. 351 (2017), no. 1, 249-282.
Frank Roumen, Sutanu Roy, Duality for convex monoids, Order 34 (2017), no. 2, 349–362.
Paweł Kasprzak, Ralf Meyer, Sutanu Roy, Stanisław Lech Woronowicz, Braided quantum SU(2) groups , J. Noncommut. Geom. 10 (2016), no. 4, 1611-1625.
Ralf Meyer, Sutanu Roy, Stanisław Lech Woronowicz, Quantum group-twisted tensor products of C*-algebras-II, J. Noncommut. Geom. 10 (2016), no. 3, 459-888.
Sutanu Roy, The Drinfeld double for C*-algebraic quantum groups, J. Operator Theory 74 (2015), no. 2, 485--515.
Sutanu Roy, Haagerup property for Drinfeld doubles, Math. Proc. R. Ir. Acad. 115A (2015), no. 1, 9.
Ralf Meyer, Sutanu Roy, Stanisław Lech Woronowicz, Quantum group-twisted tensor products of C*-algebras, Internat. J. of Math. 25 (2014), no.2 1450019, 37.
Ralf Meyer, Sutanu Roy, Stanisław Lech Woronowicz, Homomorphisms of quantum groups, Münster J. of Math. 5 (2012), 1-24.
Sutanu Roy, C*-quantum groups with projection (doctoral thesis), available at Dissertations at Georg-August-Universität Göttingen

Preprints

Anshu, Suvrajit Bhattacharjee, Atibur Rahaman, Sutanu Roy, Anyonic quantum symmetries of finite spaces [arXiv:2207.08153]
Suvrajit Bhattacharjee, Soumalya Joardar, Sutanu Roy, Braided quantum symmetries of graph C*-algebras [arXiv:2201.09885]
Sutanu Roy, Homogeneous quantum symmetries of finite spaces over the circle group [arXiv:2105.01556v2]
David Bücher, Sutanu Roy, Regularity for braided multiplicative unitaries [arXiv:1411.4611]

Teaching

MA 701 Linear algebra, Odd semester 2023-2024 at NISER
MA 707 Measure and Integration, Even semester 2022-2023 at NISER.
M 604 Analysis-II, Odd semester 2022-2023 at NISER.
M604 - Analysis-II, Odd Semester 2022-2023 at NISER
M557 - Operator algebras, Even Semester 2021-2022 at NISER.
M453 - Advance linear algebra, Odd Semester 2021-2022 at NISER.
M204 - Metric spaces, Even Semester 2020-2021 at NISER.
M401 - Functional analysis, Odd Semester 2020-2021 at NISER.
M204 - Metric spaces, Even Semester 2019-2020 at NISER.
M453 - Advance linear algebra, Odd Semester 2019-2020 at NISER.
M401 - Functional analysis, Odd Semester 2019-2020 at NISER.
M205 - Linear algebra, Even Semester 2018-2019 at NISER.
M101 - Mathematics I, Odd Semester 2018-2019 at NISER.
M311 - Numerical analysis, Even Semester 2018-2018 at NISER.
M101 - Mathematics I, Odd Semester 2017-2018 at NISER.
M311 - Numerical analysis, Even Semester 2016-2017 at NISER.
MAT1325 3X - Calculus II and an Introduction to Analysis, May–August, 2015 at the University of Ottawa.

Responsibility

Member, Purchase Committee, SMS.
Convener, Faculty Screening Committee, SMS.

Project/Thesis Guidance

Current group members:

Gargi Biswas [supervising M.Sc. thesis and supervised semester projects during the even and the odd semesters in 2022-2023].

Former members:

Sai Sriharsha Indukuri [Supervised M.Sc. thesis (even and odd semesters in 2022-2023) and semester projects during the even and the odd semesters in 2020-2021]. Afterwards, joined the Department of Mathematics at IIT Bombay as a PhD student.
Dr. Anshu [NISER Postdoctoral fellow from September 2021 to June, 2023]. Afterwards, joined the York University as a postdoctoral fellow.
Atibur Rahaman [Supervised PhD thesis (June 2017 to October, 2022). Afterwards, joined ISI Kolkata as a visiting scientist].
Swadeepta Mandal [Supervised M.Sc. thesis (even and odd semesters in 2021-2022) and semester projects during even and odd semesters in 2020-2022].
Anagha Nair [Supervised M.Sc. thesis (even and odd semesters in 2021-2022) and semester projects during even and odd semesters in 2020-2022].
K Prahlad Narasimhan (jointly with Aritra Banik) [Supervised M.Sc. thesis jointly with Aritra Banik (even and odd semesters in 2021-2022) and semester projects during even and odd semesters in 2020-2021. Afterwards, joined the Applied Mathematics and Statistics Department at SUNY, Stony Brook as a PhD student] .
Subhashree Patra [Project Assistant under SERB ECRA for one year from September, 2019].
Seetalsmita Samal [Project Assistant under SERB ECRA for one year from September, 2019].
Dr. Arnab Mandal [SERB-NPDF during September 2017-August 2018, NISER Postdoctoral Fellow during February-August, 2017]. Afterwards, joined Presidency University Kolkata as an Assistant Professor.
Dr. Gayatri Pany [Research Associate during October 2017-April 2018]. Afterwards, joined Engineering Systems and Design pillar at Singapore University of Technology and Design as a Postdoctoral Research Fellow.

Academic Presentations

Conference/Workshop talks:

Invited

Braided quantum symmetries of (classical and quantum) spaces, Conference on Functional Analysis and Related Topics, Indian Institute of Technology Bombay on 22 February, 2023.
Braided free unitary quantum groups
Rencontre 2022 de l'ANR ANCG, Cabourg on 8 November, 2022.
Braided quantum symmetries of classical and quantum spaces
A conference on ergodic theory and von Neumann algebra (online), National Institute of Science Education and Research Bhubaneswar, India on 6 August, 2022.
On braided compact quantum groups
Virtual Math Fest 2020, Institute of Mathematical Sciences Chennai, India on 20 July, 2020.
Quantum E(2) groups and beyond
IISER-NISER Mathematics Webmeet 2020 (Operator Algebra/Theory session), Indian Institute of Science Education and Research Mohali, India on 27 July, 2020.
Quantum E(2) groups for complex deformation parameter
Conference on Functional Analysis (CFA@IITB 2019), Indian Institute of Technology Bombay, India on 28 October, 2019.
Braided quantum E(2) groups
Recent Advances in Operator Theory and Operator Algebras 2018 (OTOA 2018), Indian Statistical Institute Bangalore, India on 24 December, 2018.
Braided compact quantum groups
2nd Inter IISER-NISER Math Meet 2018 (Analysis session), Indian Institute of Science Education and Research Bhopal, India on 7 July, 2018.
Braided quantum group structure on quantum plane
XXXVI Workshop on Geometric Methods in Physics, Białowież (in the S. Twareque Ali Memorial Session), Poland on 6 July, 2017.
Braided C*-quantum groups and quantum plane
Non-Commutative Analysis, Institute of Mathematical Sciences Chennai, India on 7 February, 2017.
Braided free orthogonal quantum groups
Recent Advances in Operator Theory and Operator Algebras 2016 (OTOA 2016), Indian Statistical Institute Bangalore, India on 19 December, 2016.
Intrinsic groups of double crossed products
Workshop on Dynamical Systems and Operator Algebras, University of Ottawa, Canada on 31 May, 2016.
Duality for convex monoids
Winter meeting of the Canadian Mathematical Society in the Operator algebra session, Montreal, Canada on 7 December, 2015.
Faithful actions of locally compact quantum groups on classical spaces
Banach Algebras and Applications and Retrospective Meeting for the 2014 Thematic Program on Abstract Harmonic Analysis, Banach and Operator Algebras, Fields Institute, Canada on 8 August, 2015.
Slices of braided multiplicative unitaries
Summer meeting of the Canadian Mathematical Society in the C*-algebra session, Charlottetown, Canada on 6 June, 2015.
Quasitriangular quantum group twisted tensor product of C*-algebras
Fields workshop on Recent Developments in Quantum Groups, Operator Algebras and Applications, University of Ottawa, Canada on 6 February, 2015.
The Haagerup property of the generalised Drinfeld double
Workshop on Operator Spaces, Locally Compact Quantum Groups and Amenability (Thematic Program on Abstract Harmonic Analysis, Banach and Operator Algebras), Fields Institute Toronto, Canada on 29 May, 2014.
Quantum group with projection
Quantum Geometry and matter, SISSA-Trieste, Italy on 10 April, 2013.
Quasitriangular quantum groups and coaction category
10th Geometry and Physics Conference "Quantum Geometry", Crete, Greece on 7 August, 2012.
Homomorphisms of Quantum Groups
Operator Algebras and Quantum Groups - conference in honour of Stanisław Lech Woronowicz's seventieth birthday, Warsaw, Poland on 20 September, 2011.

Contributed

Braided quantum symmetries of classical and quantum spaces
Noncommutative harmonic analysis and quantum groups, Będlewo, Poland on 13 September, 2022.
Homogeneous quantum symmetries of finite quantum spaces over the circle group,
Quantum Groups and Algebraic Quantum Field Theory, A special session of the conference International Workshop on Operator Theory and its Applications (IWOTA), Lancaster, UK, August 20, 2021.
Quantum symmetries of the twisted tensor products of C*-algebras,
"Noncommutative Geometry: Physical and Mathematical Aspects of Quantum Space- Time and Matter", SNBNCBS, Kolkata, India, November 29, 2018.
Quantum symmetries of the twisted tensor products of C*-algebras,
18th Workshop: Noncommutative Probability, Operator Algebras, Random Matrices and Related Topics, with Applications, Będlewo, Poland, July 18, 2018.
Braided commutative representations of C*-algebras, Canadian Operator Algebra Symposium (COSy), Fields Institute Toronto, Canada, June 23, 2014.
C*-Quantum group with projection (Poster), SFB-Workshop Groups, Dynamical Systems and C*-Algebras, Münster, Germany, August 21, 2013.
Quasitriangular C*-quantum groups and braiding (Poster), 6th European congress of Mathematics, Krakow, Poland, July 3–4, 2012.
Semidirect product of C*-Quantum Groups, Master class on Quantum Groups, Copenhagen, Denmark, March 8, 2012.
Homomorphisms of Quantum Groups, 7th International Conference Quantum Theory and Symmetries, Prague, Czech Republic, August 11, 2011.
Homomorphisms of Quantum Groups, XXX Workshop on Geometric Methods in Physics, Białowież, Poland, June 26, 2011.

Talks at the outreach events

An excursion to quantum permutations,
Seminar series organised for summer students, School of Physical Sciences, NISER Bhubaneswar on 6 July, 2022.
A tale of a rotating needle of length one, Outreach talk NISER Bhubaneswar on 8 April, 2022.

Seminars and colloquia

Anyonic quantum symmetries of finite spaces
Stat-Math Unit, Indian Statistical Institute Kolkata on 19 July, 2023.
Braided quantum symmetries of graph C*-algebras
North Atlantic Noncommutative Geometry Seminar (online), on 5 April, 2023.
Quantum symmetries of finite spaces
Mathematics Online Seminar Series (MOSS), Indian Institute of Science Education and Research Berhampur on 1 April, 2023.
Quantum symmetries of finite spaces
Department of Mathematics and Statistics seminar, Indian Institute of Science Education and Research Kolkata on 27 February, 2023.
Quantum symmetries of finite spaces
Mathematics and Statistics colloquium, Indian Institute of Technology Kanpur on 2 February, 2023.
Braided quantum symmetries of classical and quantum spaces
Stat-Math Unit (online seminar), Indian Statistical Institute Delhi on 26 October, 2022.
Braided quantum symmetries of finite sets
Functional Analysis Seminar, Laboratoire de mathématiques de Besançon on 13 September, 2022.
Braided quantum symmetries of graph C*-algebras
APRG Seminar, Indian Institute of Science Bangalore on 8 June, 2022.
Braided quantum symmetries of finite spaces
Mathematics Colloquium, TIFR Centre For Applicable Mathematics Bangalore on 7 June, 2022.
Braided quantum symmetries of graph C*-algebras
Virtual quantum symmetry seminar, Department of Mathematics, Ohio State University, USA on 8 March, 2022.
Homogeneous quantum symmetries of finite spaces over the circle group
APRG Seminar (online), Indian Institute of Science Bangalore on 17 November, 2021.
Contraction and bosonisation
Tokyo-Kyoto Joint Online Operator Algebra Seminar on 12 November, 2020.
Compact quantum groups and their semidirect products
Topological Groups (online), University of Hawai`i , USA on 29 September 29, 2020.
Quantum group contraction and bosonisation
Webinars on Operator Theory and Operator Algebras on 16 September, 2020.
Braided compact quantum groups: motivation and examples
Department of Mathematics and Statistics, Indian Institute of Science Education and Research Kolkata on 22 July, 2019.
Braided Quantum Groups in C*-algebraic framework
School of Mathematics, Tata Institute of Fundamental Research Mumbai on 24 May, 2019.
Quantum plane and duality
Department of Mathematics, Indian Institute of Technology Bombay on 22 February, 2019.
Symmetries and Quantum Groups
Center for Theoretical Studies, Indian Institute of Technology Kharagpur on 26 November, 2018.
From CCR to quantum groups
Center for Theoretical Studies, Indian Institute of Technology Kharagpur on 24 August, 2018.
Semidirect product of groups and beyond
Department of Mathematics, Indian Institute of Technology Guwahati on 23 May, 2018.
Semidirect product of groups and beyond
The Institute of Mathematical Sciences Chennai on 19 March, 2018.
Quantum Symmetries of twisted tensor product of C*- algebras
Stat-Math Unit, Indian Statistical Institute Kolkata on 2 February, 2018.
Semidirect product of compact quantum groups
Department of Mathematics, Indian Institute of Science Education and Research Mohali on 12 August, 2016.
Braided quantum SU(2) groups
Stat-Math Unit, Indian Statistical Institute Delhi on 8 August, 2016.
Multiplicative unitaries for locally compact groups
Stat-Math Unit, Indian Statistical Institute, Kolkata on 18 July, 2016.
Braided quantum SU(2) groups
Operator algebra seminar, Fields Institute Toronto, Canada on 7 June, 2016.
Semidirect product of compact quantum groups
Department of Mathematics, Indian Institute of Technology Madras on 10 May, 2016.
Braided quantum SU(2) groups
Oberseminar AG-Speicher, Faculty of Mathematics, Universität Saarlandes, Germany on 16 February, 2016.
Landstad-Vaes theory for locally compact quantum groups
Mathematics Institut Georg-August-Universität Göttingen, Germany on 10 February, 2016.
Quantum group-twisted tensor product of C*-algebras
Analysis Seminar, University of Ottawa, Canada on 13 January, 2016.
Faithful actions of locally compact quantum groups on spaces
Department of Mathematics and Statistics, University of New Brunswick, Canada on 3 December, 2015.
Braided C*-quantum groups
The Institute of Mathematical Sciences Chennai, November 9, 2015.
Landstad-Vaes theory for locally compact quantum groups
Department of Mathematics, Indian Institute of Science Bangalore on 6 November, 2015.
Faithful actions of locally compact quantum groups on classical spaces
Department of Mathematics, Indian Institute of Science Education and Research Bhopal on 15 October, 2015.
The Drinfeld double for C*-algebraic quantum groups
Stat-Math Unit, Indian Statistical Institute, Kolkata on 13 March, 2015.
From Hopf algebras to locally compact quantum groups
Logic seminar, Department of Mathematics and Statistics, University of Ottawa, Canada on 27 February, 2015.
Braided quantum SU(2) groups
Tata Institute of Fundamental Research, Mumbai on 28 November, 2014.
A brief introduction to braided multiplicative unitaries
Department of Mathematics, Indian Institute of Technology, Delhi on 17 October, 2014.
The Haagerup property of the Drinfeld doubles
School of Physical Sciences, Jawaharlal Nehru University, India on 16 October, 2014.
Quantum group-twisted tensor product of C*-algebras
Department of Mathematics and Statistics, University of Ottawa, Canada on 4 March, 2014.
Quantum group-twisted tensor product of C*-algebras
Department of Pure Mathematics, University of Waterloo, Canada, on 20 February, 2014.
Quantum group-twisted tensor product of C*-algebras, Operator algebra seminar, Fields Institute Toronto, Canada on 6 February, 2014.
Twisted tensor product of C*-algebras
Stat-Math Unit, Indian Statistical Institute Delhi, India on 25 October, 2013.
Associative twisted tensor product of C*-algebras
Department of Mathematics, Shiv Nadar University, India on 10 October, 2013.
From locally compact groups to C*-quantum groups: multiplicative unitary approach
Department of Mathematics, Indian Institute of Technology Ropar on 9 October, 2013.
On braided multiplicative unitaries
Department of Mathematical Methods in Physics, University of Warsaw, Poland on 23 May, 2013.
Quantum groups with a projection
Mathematical Institute of the Polish Academy of Sciences Warsaw, Poland on 20 May, 2013.
Twisted tensor product of C*-algebras
Department of Mathematics, Indian Institute of Science Education and Research Kolkata on 3 April, 2013.
On braided multiplicative unitaries
Stat-Math Unit, Indian Statistical Institute Kolkata on 20 March, 2013.
On canonical commutation relation
Department of Mathematics, Indian Institute of Technology Guwahati on 19 March, 2013.
Twisted tensor product of C*-algebras
Graduate School of Mathematical Sciences, The University of Tokyo, Japan on 15 March, 2013.
Universal Coefficient Theorems and assembly maps in KK-theory
Oberseminar AG-Meyer, Mathematics Institut, Georg-August-Universität Göttingen, Germany on 29 November, 2012.
Category of locally compact quantum groups
Chennai Mathematical Institute, India on 20 December, 2011.
An overview of Grothendieck group construction and its application
Indian Institute of Technology Guwahati on 13 October, 2011.
Homomorphisms of quantum groups
Colloquium of Gk 1493: "Mathematische Strukturen in der modernen Quantenphysik'', Mathematics Institute, Georg-August-Universität Göttingen, Germany on 26 May, 2011.
Homomorphisms of quantum groups
Department of Mathematical Methods in Physics, University of Warsaw, Poland on 17 March, 2011.
Morphisms of quantum groups via linking unitaries
Indian Institute of Technology Guwahati on 7 October, 2010.
Morphisms of quantum groups via linking unitaries,
Seminar talk at 7th Focused Semester: Quantum groups, Université de Caen, France on 16 September, 2010.

Academic Visits

Research Stays:
- Theoretical Statistics and Mathematics Unit, Indian Statistical Institute Kolkata, from 10 to 21 July, 2023 hosted by Debashish Goswami.
- Department of Mathematics and Statistics, Indian Institute of Science Education and Research Kolkata, from 27 February to 5 March, 2023 hosted by Soumalya Joardar.
- Department of Mathematics and Statistics, Indian Institute of Technology Kanpur, from 1 to 3 February, 2023 hosted by Sasmita Patnaik.
- Department of Mathematics and Statistics, Indian Institute of Science Education and Research Kolkata, from 30 to 31 January, 2023 hosted by Soumalya Joardar.
- Laboratoire de mathématiques de Besançon, during September and November, 2022 hosted by Uwe Franz.
- Indian Institute of Science, from 1 to 12 June, 2022 hosted by Tirthankar Bhattacharyya.
- Theoretical Statistics and Mathematics Unit, Indian Statistical Institute Kolkata, from 9 to 13 May, 2022 hosted by Debashish Goswami.
- Theoretical Statistics and Mathematics Unit, Indian Statistical Institute Kolkata, from December 23, 2019 to January 1, 2020 hosted by Debashish Goswami.
- Theoretical Statistics and Mathematics Unit, Indian Statistical Institute Kolkata, from September 30 to October 5, 2019 hosted by Jyotishman Bhowmick.
- Department of Mathematics and Statistics, Indian Institute of Science Education and Research Kolkata, from July 22 to 23, 2019 hosted by Md. Ali Zinna.
- Department of Mathematics, Presidency University Kolkata, from June 6 to 14, 2019 hosted by Arnab Mandal.
- School of Mathematics, Tata Institute of Fundamental Research Mumbai, from May 26 to 31, 2019 hosted by Anish Ghosh.
- Theoretical Statistics and Mathematics Unit, Indian Statistical Institute Kolkata, from May 13 to 17, 2019 hosted by Debashish Goswami.
- Theoretical Statistics and Mathematics Unit, Indian Statistical Institute Kolkata, from April 17 to 19, 2019 hosted by Debashish Goswami.
- Mathematisches Institut, Georg-August-Universität Göttingen from February 25 to March 1, 2019 hosted by Ralf Meyer.
- Department of Mathematics, Indian Institute of Technology Bombay, from February 21 to 23, 2019 hosted by Bata Krishna Das.
- Theoretical Statistics and Mathematics Unit, Indian Statistical Institute Delhi, from December 24 to 28, 2018 hosted by Arup Kumar Pal.
- Jawaharlal Nehru Centre for Advanced Scientific Research, from December 10 to 13, 2018 hosted by Soumalya Joardar.
- Center for Theoretical Studies, Indian Institute of Technology Kharagpur from November 23 to 26, 2018 hosted by Sayan Kar.
- Theoretical Statistics and Mathematics Unit, Indian Statistical Institute Kolkata, from November 7 to 9, 2018 hosted by Debashish Goswami.
- Center for Theoretical Studies, Indian Institute of Technology Kharagpur from August 22 to 25, 2018 hosted by Bibhas Adhikari.
- Theoretical Statistics and Mathematics Unit, Indian Statistical Institute Kolkata, from August 14 to 17, 2018 hosted by Debashish Goswami.
- Instytut Matematyczny Polskiej Akademii Nauk Warsaw from July 9 to 13, 2018 hosted by Stanisław Lech Woronowicz.
- Theoretical Statistics and Mathematics Unit, Indian Statistical Institute Kolkata, from June 25 to July 3, 2018 hosted by Jyotishman Bhowmick.
- Department of Mathematics, Indian Institute of Technology Guwahati, from May 21 to 25, 2018 hosted by Arup Chattopadhyay.
- Theoretical Statistics and Mathematics Unit, Indian Statistical Institute Kolkata, from May 16 to 18, 2018 hosted by Debashish Goswami.
- The Institute of Mathematical Sciences Chennai, India, from March 24 to April 1, 2018 hosted by Partha Sarathi Chakraborty.
- Theoretical Statistics and Mathematics Unit, Indian Statistical Institute Kolkata, from February 24 to March 4, 2018 hosted by Debashish Goswami.
- Theoretical Statistics and Mathematics Unit, Indian Statistical Institute Kolkata, from December 11 to 15, 2017 hosted by Debashish Goswami.
- Theoretical Statistics and Mathematics Unit, Indian Statistical Institute Kolkata, from October 3 to 6, 2017 hosted by Swagato Kumar Ray.
- Instytut Matematyczny Polskiej Akademii Nauk Warsaw from July 28 to 30, 2017 invited by Stanisław Lech Woronowicz.
- Theoretical Statistics and Mathematics Unit, Indian Statistical Institute Kolkata, from June 5 to 11, 2017 invited by Jyotishman Bhowmick.
- Theoretical Statistics and Mathematics Unit, Indian Statistical Institute Delhi, from May 15 to 19, 2017 invited by Arup Kumar Pal.
- Theoretical Statistics and Mathematics Unit, Indian Statistical Institute Kolkata, from April 24 to 27, 2017 invited by Debashish Goswami.
- Theoretical Statistics and Mathematics Unit, Indian Statistical Institute Delhi, from August 4 to 10, 2016 invited by Arup Kumar Pal.
- Theoretical Statistics and Mathematics Unit, Indian Statistical Institute Kolkata, from March 28 to May 20, 2016 invited by Debashish Goswami.
- Faculty of Mathematics, Saarland University from February 14 to 18, 2016 hosted by Moritz Weber.
- Mathematisches Institut, Georg-August-Universität Göttingenfrom February 1 to 14, 2016 hosted by Ralf Meyer.
- Department of Mathematics and Statistics, University of New Brunswick from November 29 to December 3, 2015 hosted by Dan Kucerovsky.
- Research in Pairs (jointly with Stanisław Lech Woronowicz) at the Mathematisches Forschungsinstitut Oberwolfach from August 3 to 30, 2014.
- Visiting Researcher at the Mathematisches Institut, Georg-August-Universität Göttingen from July 1 to 29, 2014 hosted by Ralf Meyer.
- Several one week or two weeks research stays at the Fachbereich Mathematik und Informatik,Westfälische Wilhelms-Universität Münster between August 2013 and January 2016 hosted by Thomas Timmermann.
- Graduate School of Mathematical Sciences, The University of Tokyo from February 17 to March 16, 2013 hosted by Yasuyuki Kawahigashi.
- Several one week research visits to the IMPAN and Katedra Metod Mathematycznych Fizyki, University of Warsaw between March, 2010 and May, 2013 hosted by Stanisław Lech Woronowicz.
- Several one week and one month research visit to the Theoretical Statistics and Mathematics Unit, Indian Statistical Institute Kolkata, between December, 2010 and March, 2015 hosted by Debashish Goswami.
Conference and Workshop participations (without presentations):
- Workshop on New Directions in Inverse Semigroups, Ottawa, Canada, 2016.
- Winter school on Isomorphism conjecture and Geometry of Groups, Münster, Germany,January 2016.
- Noncommutative Geometry and Spectral Invariants, Montreal, Canada, 2015.
- Noncommutative geometry and quantum groups, Oslo, Norway, 2012.
- EU-NCG 4th Annual Meeting, Bucharest, Romania, April, 2011.
- K-Theory, C*-Algebras and Index Theory, Göttingen, Germany, November 2010.
- Workshop on Quantum groups and physics, Caen, France, September 2010.
- Conference Quantum Groups, Clermont-Ferrand, France, August-September 2010.
- 8th Annual Spring Institute on Noncommutative Geometry and Operator Algebra -Von Neumann Algebras, Vanderbilt University, Nashville, USA, May 2010.
- Workshop on Multiplicity Conjectures, Resolution of Singularities and Toric Geometry, Indian Institute of Technology Madras, India, December 2008 – January 2009.
- Research Workshop in Optimization Theory and Applications, Indian Institute of Technology Kanpur, India September 2008.

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