Qaisar Shafi

Qaisar Shafi
Dr. Shafi in 2020
Nationality	Pakistani, American, British
Alma mater	Imperial College
Awards	Fellow of the American Physical Society; Alexander von Humboldt Prize (1997)
Scientific career
Fields	Theoretical Physics, Cosmology
Doctoral advisor	Abdus Salam
Doctoral students	Cem Salih Ün, Amit Tiwari

Qaisar Shafi is a Pakistani-American theoretical physicist and the Inaugural Bartol Research Institute Professor of Physics at the University of Delaware. ^[1]

Biography

Shafi grew up in Karachi, Pakistan and lived there until his early teens when his family moved to London, United Kingdom. ^[2] After graduating as valedictorian from Holland Park School, London, UK, he studied physics at Imperial College, London, where he received both his B.Sc. Honors and PhD. His PhD advisor was the late Nobel Laureate Professor Abdus Salam, whom he subsequently joined at the International Centre for Theoretical Physics (ICTP) in Trieste, Italy. ^[3] Shafi was awarded an Alexander von Humboldt Prize and spent some years in Germany (Munich, Aachen, and Freiburg). ^[4] In 1978, he received his Habilitation with Venia Legendi from the University of Freiburg. He then spent two years at CERN (Geneva, Switzerland) after which he moved to the United States. ^[5] Since 1983, Shafi has been a faculty member at the Bartol Research Institute, University of Delaware, which in 2005 merged with the Department of Physics and Astronomy.

Shafi has done pioneering research in areas ranging from Grand Unification to Kaluza-Klein theories, to inflationary cosmology and supersymmetric theories, and he is widely regarded as a leader in these fields. He has published more than 300 papers in refereed journals, among them many of the most prestigious in the field, lectured at close to 250 conferences, workshops, and universities. ^[6]

Research Work

Contemporary high energy physics could be subdivided into the energy frontier, the cosmic frontier and the intensity frontier. Shafi, whose work is highly interdisciplinary, has made pioneering contributions in all three areas. Shafi’s work has focused on Grand Unified Theories (GUTs), Yukawa coupling unification, dark matter and collider physics, inflationary cosmology, topological defects, thermal inflation, superstring phenomenology and related topics. ^[7] His pioneering works include:

• Discovery of stable cosmic strings with Sir Tom Kibble and George Lazarides in Grand Unified Theories
• Discovery of discrete Z_2 symmetry in SO (10) with Sir Tom Kibble and George Lazarides. This gauge Z_2 symmetry plays a critical role in explaining why the dark matter in the universe is stable. ^{[8] [9]}
• Discovery of topological defects called “walls bounded by strings” with Sir Tom Kibble and George Lazarides. ^[10] These topological structures were discovered recently in superfluid ³He and are called Kibble-Lazarides-Shafi (KLS) walls. ^{[11] [12]}
• Discovery of type II seesaw mechanism with George Lazarides and Christof Wetterich in Grand Unified Theories ^[13]
• Discovery that axionic strings are superconducting with George Lazarides ^[14]
• Pioneering paper with George Lazarides on non-thermal leptogenesis in inflationary cosmology
• Discovery of Yukawa unification in supersymmetric GUTs with Balasubramanian Ananthanarayan and George Lazarides ^[15]
• Novel mechanism (Lazarides-Shafi mechanism) for solving the axion domain wall problem ^[16]
• D-brane inflation with Giorgi Dvali and Sviatoslav Solganik ^[17]
• Shafi-Vilenkin Inflationary Model ^{[18] [19]}
• Fermion mass hierarchies in five dimensional models with Stephan Huber ^[20]
• Supersymmetric Hybrid Inflation with Giorgi Dvali and Robert Schaefer ^[21]

Outreach Work

Shafi has done also extensive outreach work for the scientific community. From the early 1980s until 1997, he organized/co-organized several weeks long summer schools at the International Centre for Theoretical Physics in Trieste. For more than fifteen years, Shafi was one of the key organizers for each summer school. ^[22]

In addition, he was also one of the principal organizers of the BCVSPIN (acronym denoting the countries Bangladesh-China-Vietnam-Sri Lanka-Pakistan-India-Nepal) schools, which he co-founded in 1989 with Professors Abdus Salam, Jogesh Pati and Yu-Lu. ^{[23] [24]} The concept underlying BCVSPIN was to allow young scientists living in underserved regions to engage in research. Professor Shafi organized, lectured at, and led numerous BCVSPIN schools as well as associated preparatory schools, and thus helped lay the groundwork for the successful careers of many graduate students and postdoctoral fellows while also keeping track of their progress. He directed or co-directed the BCVSPIN summer schools from 1989 to 1997 and after a hiatus of several years, caused by the shifting political climate in Nepal, single-handedly resurrected the school in 2007, organizing highly successful schools in China, Vietnam and also branching out to Mexico. ^[25]

In 2025, Qaisar Shafi received the Spirit of Salam Award for his longstanding contributions to Abdus Salam’s vision, including his role in the BCVSPIN initiative to promote high-energy physics in South and Southeast Asia and his support for the Qaiser and Monika Shafi Prize for Diploma students. ^[26]

Personal life

Qaisar Shafi is married to Monika Shafi, the Elias Ahuja Professor Emerita of German Literature at the University of Delaware. They have a daughter and a son. ^[27]

References

1. "Bartol Research Institute". University of Delaware. Retrieved 12 November 2020.
2. Interview with Qaisar Shafi at University of Delaware, conducted on November 11th, 2020
3. Abdus Salam and Physics Beyond the Standard Model. Harvard Astrophysics Data System. 2017. Bibcode:2017mvas.book..109S . Retrieved 12 November 2020.
4. "Inaugural Bartol Research Institute Professorship in Physics awarded to Prof. Shafi". University of Delaware.
5. "Qaisar Shafi" (PDF). University of Delaware. Retrieved 12 November 2020.
6. "Qaisar Shafi". INSPIRE-HEP. Retrieved 12 November 2020.
7. "Google Scholar for Qaisar Shafi" . Retrieved 14 November 2020.
8. "What is Z2 symmetry in Particle Physics and how is it useful beyond SM?" . Retrieved 14 November 2020.
9. G. Lazarides and Q. Shafi (2020). "Axion Model with Intermediate Scale Fermionic Dark Matter". Physics Letters B. 807: 135603. arXiv: 2004.11560 . Bibcode:2020PhLB..80735603L. doi:10.1016/j.physletb.2020.135603. S2CID   216144739.
10. T.W.B. Kibble, G. Lazarides and Q. Shafi. "Walls Bounded by Strings" . Retrieved 14 November 2020.
11. J.T. Mäkinen, V.V. Dmitriev, J. Nissinen, J. Rysti, G.E. Volovik, A.N. Yudin, K. Zhang, V.B. Eltsov. "Half-quantum vortices and walls bounded by strings in the polar-distorted phases of topological superfluid ³He". Nature Commun. Retrieved 13 February 2022.
12. K. Zhang (2020). "One dimensional nexus objects, network of Kibble-Lazarides-Shafi string walls, and their spin dynamic response in polar distorted B-phase of ³He". Physical Review Research. 2 (4): 043356. arXiv: 2008.09286 . Bibcode:2020PhRvR...2d3356Z. doi:10.1103/PhysRevResearch.2.043356. S2CID   221246192.
13. Penrow, Marcus. "Phenomenology of SO(10) Grand Unified Theories" . Retrieved 14 November 2020.
14. G. Lazarides and Q. Shafi (1985). "Superconducting strings in axion models" . Physics Letters B. 151 (2): 123–126. Bibcode:1985PhLB..151..123L. doi:10.1016/0370-2693(85)91398-X . Retrieved 14 November 2020.
15. B. Ananthanarayan and P. Minkowski (1997). "Status of Supersymmetric Grand Unified Theories". arXiv: hep-ph/9702279 .
16. C. Chatterjee, T. Higaki and M. Nitta (2020). "Note on a solution to domain wall problem with the Lazarides-Shafi mechanism in axion dark matter models". Physical Review D. 101 (7): 075026. arXiv: 1903.11753 . Bibcode:2020PhRvD.101g5026C. doi: 10.1103/PhysRevD.101.075026 . S2CID   85543613.
17. G. Dvali, Q. Shafi and S. Solganik (2001). "D-brane Inflation". arXiv: hep-th/0105203 .
18. K. Sravan Kumar and Paulo Vargas Moniz (2019). "Conformal GUT inflation, proton lifetime and non-thermal leptogenesis". The European Physical Journal C. 79 (11): 945. arXiv: 1806.09032 . Bibcode:2019EPJC...79..945K. doi: 10.1140/epjc/s10052-019-7449-1 . hdl: 10400.6/7713 . S2CID   119473350.
19. Linde, Andrei (1990). "PARTICLE PHYSICS AND INFLATIONARY COSMOLOGY". CiteSeerX   10.1.1.740.4494 .
20. Q. Shafi and S. Huber (2001). "Fermion masses, mixings and proton decay in a Randall–Sundrum model". Physics Letters B. 498 (3–4): 256–262. arXiv: hep-ph/0010195 . Bibcode:2001PhLB..498..256H. doi:10.1016/S0370-2693(00)01399-X. S2CID   17428982 . Retrieved 18 November 2020.
21. Q. Shafi, G. Dvali and R. Schaefer. "Large scale structure and supersymmetric inflation without fine tuning" . Retrieved 19 November 2020.
22. "The Abdus Salam International Centre for Theoretical Physics" . Retrieved 16 November 2020.
23. "BCVSPIN" . Retrieved 16 November 2020.
24. American Institute of Physics. "Yu-Lu" . Retrieved 16 November 2020.
25. "BCVSPIN" . Retrieved 16 November 2020.
26. "Spirit of Salam 2025 Awardees Announced" . Retrieved 4 February 2025.
27. "Monika Shafi". University of Delaware. Retrieved 17 November 2020.

External links

• Qaisar Shafi publications indexed by Google Scholar