Cristian Dumitru Popescu
{{short description|Romanian-American mathematician}}
{{Infobox scientist
|name = Cristian D. Popescu
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|birth_date = 1964
|birth_place = Novaci, Gorj County, România
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|nationality = Romanian-American
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|workplaces = Johns Hopkins University
University of California, San Diego
|alma_mater = University of Bucharest
Ohio State University
|thesis_title = On a refined Stark conjecture for function fields
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|thesis_year = 1996
|doctoral_advisor = Karl Rubin
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Cristian Dumitru Popescu (born 1964) is a Romanian-American mathematician at the University of California, San Diego. His research interests are in algebraic number theory, and in particular, in special values of L-functions.
Education and career
The son of historian Dumitru Micu Popescu and biologist Rodica Jerișteanu,
Popescu was born in 1964 in Novaci, Gorj County.{{cite web|url=https://www.verticalonline.ro/dumitru-micu-popescu-si-dumitru-popica-in-slujba-scolii|title=Dumitru Micu Popescu și Dumitru Popica în slujba școlii|lang=ro| work=Vertical|first=Cornel|last=Șomâcu| date=July 25, 2013|access-date=July 5, 2023}} After completing his undergraduate studies at the Faculty of Mathematics of the University of Bucharest, he obtained his Ph.D. from the Ohio State University in 1996, with thesis "On a refined Stark conjecture for function fields" written under the direction of Karl Rubin.{{MathGenealogy|10545}} He became a professor at Johns Hopkins University, after which he moved to his current position as a professor at UC San Diego.
Research contributions
Popescu formulated and proved function field versions of the Gras conjectures and Rubin's integral refinement of the abelian Stark conjectures. He has also made important contributions to the Stark conjectures over number fields, formulating an alternative to Rubin's refinement, known as Popescu's conjecture. Although slightly weaker than Rubin's conjecture, it has the advantage that it can presently be shown to remain true under raising the base field or lowering the top field of the extension. Popescu and Cornelius Greither formulated equivariant versions of Iwasawa's main conjecture over function fields and number fields,{{cite journal |last1=Greither |first1=Cornelius |last2=Popescu|first2=Cristian|title=An equivariant main conjecture in Iwasawa theory and applications |journal=Journal of Algebraic Geometry |date=2015 |volume=24 |issue=4 |pages=629–692 |doi=10.1090/jag/635|arxiv=1103.3069 |s2cid=119266799 }} proving unconditionally the function field version and conditionally the number field version. These conjectures have important implications for the Brumer–Stark conjecture, the Coates-Sinnott conjecture and Gross' conjecture on special values of L-functions.
Recognition
Popescu was awarded the Simion Stoilow Prize by the Romanian Academy in 2002.{{cite web|url=https://acad.ro/premiileAR/liste/2002.pdf|title=Premiile Academiei Române pentru anul 2002}} In 2015-2016, he was a Simons Fellow at Harvard University.{{cite journal |title=The 2015 Notices Index|date=December 2015 |journal=Notices of the American Mathematical Society |volume=62 |issue=11 |pages=1440 |url=https://www.ams.org/notices/201511/201511FullIssue.pdf|access-date=2023-08-08 }} He was elected to the 2021 class of fellows{{citation|url=https://www.ams.org/cgi-bin/fellows/fellows_by_year.cgi?year=2021|title=2021 Class of Fellows of the AMS|publisher=American Mathematical Society|access-date=2020-11-02}} of the American Mathematical Society "for contributions to number theory and arithmetic geometry". He is an honorary member of the Institute of Mathematics of the Romanian Academy.{{cite web|url=http://www.imar.ro/organization/people/honoraryMembers.php|title=Honorary members of the Simion Stoilow Institute of Mathematics of the Romanian Academy|access-date=2023-08-08}}
References
{{reflist}}
External links
- {{MathGenealogy |id=10545}}
- [http://www.math.ucsd.edu/~cpopescu/ Home page]
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Category:People from Gorj County
Category:20th-century Romanian mathematicians
Category:20th-century American mathematicians
Category:21st-century Romanian mathematicians
Category:21st-century American mathematicians
Category:Romanian emigrants to the United States
Category:University of Bucharest alumni
Category:Ohio State University alumni
Category:Johns Hopkins University faculty