{{Short description|German physicist (born 1977)}} '''Niklas Beisert''' (born 1977 in Hamburg) is a German theoretical physicist, known for his research on quantum field theory and string theory.
==Biography== Niklas Beisert is the son of the architect and art historian Anna Katharina Beisert-Zülch (of the University of Hildesheim) and the architect Thomas Beisert (of the company ''APB Planungsgesellschaft mbH Architekten''). Anna Katharina Beisert-Zülch's father was the neuroscientist {{ill|Klaus-Joachim Zülch|de}} (1910–1988).<ref>Annegret Lucie Henning: [https://www.zhb.uni-luebeck.de/epubs/ediss79.pdf ''Klaus Joachim Zülch: sein Leben; sein Werk; Werkverzeichnis''] (his life; his work; ''catalogue raisonné'') University of Lübeck, 2004 (dissertation)</ref> Niklas Beisert studied physics, as a scholarship holder of the ''Studienstiftung des Deutschen Volkes'' (German Academic Scholarship Foundation), at the Technical University of Munich from 1996 to 2001, when he received his ''Diplom''. For the academic year 1999–2000 he attended an M.Sc. course at Imperial College London. After receiving his ''Diplom'' he was a researcher the Max Planck Institute for Gravitational Physics in Golm-Potsdam. In 2004 he received his doctorate from the Humboldt University of Berlin. His doctoral dissertation ''The Dilation Operator of N=4 Super-Yang-Mills Theory and Integrability'' was supervised by Matthias Staudacher.<ref>{{MathGenealogy|id=115124|name=Niklas Bessert}}</ref> As a post-doctoral fellow, Beisert was at Princeton University (as a Dicke Fellow), where he became an assistant professor in 2005. From 2006 to 2011 he was group leader of the theory group ''Dualität und Integrable Strukturen'' (Duality and Integrable Structures) at the Max Planck Institute for Gravitational Physics in Golm-Potsdam. Since 2011 is a full professor at ETH Zurich. He is married and the father of three children.<ref name=homepage>{{cite web|title=Prof. Dr. Niklas Beisert (homepage) |website=ETH Zürich|url=https://itp.phys.ethz.ch/people/professors/beisert.html}} (with link to Beisert's articles at arxiv.org)</ref>
==Research== Beisert does research on integrable structures (''i.e.'', structures that allow exact solvability) and symmetries in (four-dimensional) gauge field theory and string theory related to the AdS/CFT correspondence. The AdS/CFT correspondence expresses an equivalence in the description of gauge theories (as used in the Standard Model of elementary particle physics) and string theories, but has not yet been proven or disproven. By applying techniques that have been used for exactly integrable systems in solid-state physics (such as one-dimensional spin chains<ref>{{cite journal|doi=10.1016/j.nuclphysb.2003.08.015 |title=The N=4 SYM integrable super spin chain |date=2003 |last1=Beisert |first1=Niklas |last2=Staudacher |first2=Matthias |journal=Nuclear Physics B |volume=670 |issue=3 |pages=439–463 |arxiv=hep-th/0307042 |bibcode=2003NuPhB.670..439B }}</ref><ref>{{cite journal|doi=10.1016/j.nuclphysb.2003.12.032 |title=The 𝖘𝖚(2{{!}}3) dynamic spin chain |date=2004 |last1=Beisert |first1=Niklas |journal=Nuclear Physics B |volume=682 |issue=3 |pages=487–520 |arxiv=hep-th/0310252 }}</ref> and the Bethe ansatz<ref>{{cite journal|arxiv=hep-th/0504190 |doi=10.1016/j.nuclphysb.2005.06.038 |title=Long-range 𝖕𝖘𝖚(2,2{{!}}4) Bethe ansätze for gauge theory and strings |date=2005 |last1=Beisert |first1=Niklas |last2=Staudacher |first2=Matthias |journal=Nuclear Physics B |volume=727 |issue=1–2 |pages=1–62 }}</ref><ref>{{cite journal|arxiv=hep-th/0505187 |doi=10.1088/1126-6708/2005/08/039 |title=Beauty and the twist: The Bethe ansatz for twisted N = 4 SYM |date=2005 |last1=Beisert |first1=Niklas |last2=Roiban |first2=Radu |journal=Journal of High Energy Physics |issue=8 |page=039 |bibcode=2005JHEP...08..039B }}</ref><ref>{{cite journal|arxiv=nlin/0610017 |doi=10.1088/1742-5468/2007/01/P01017 |title=The analytic Bethe ansatz for a chain with centrally extended 𝖘𝖚(2{{!}}2) symmetry |date=2007 |last1=Beisert |first1=Niklas |journal=Journal of Statistical Mechanics: Theory and Experiment |page=01017 }}</ref>), Beisert, Staudacher, and colleagues made progress in gauge/string duality for the case of supersymmetric gauge field theories with maximal symmetry (planar N=4 supersymmetric Yang-Mills theory, with symmetry group 𝖕𝖘𝖚(2,2|4)). This research effort was pioneered by the University of Uppsala's Joseph Minahan and Konstantin Zarembo, who previously found evidence of integrable structures.<ref>{{cite journal|arxiv=hep-th/0504190 |doi=10.1016/j.nuclphysb.2005.06.038 |title=Long-range Bethe ansätze 𝖕𝖘𝖚(2,2{{!}}4) for gauge theory and strings |date=2005 |last1=Beisert |first1=Niklas |last2=Staudacher |first2=Matthias |journal=Nuclear Physics B |volume=727 |issue=1–2 |pages=1–62 }}</ref> The resulting research developments in the solution of supersymmetric gauge field theories for large ''N'' was described by David Gross, at the Strings-07 conference in Madrid, as the most interesting development in string theory in the preceding year.<ref>{{cite web|url=https://www.youtube.com/watch?v=h4i57PKp6SE&t=328s | title=David Gross - Perspectives (Strings 2007) | website=YouTube | date=30 March 2014 }} (See 5:28 in video.)</ref>
==Awards and honors== He received in 2005 the Otto Hahn Medal of the Max Planck Society<ref name=homepage/> and in 2007 the Gribov Medal of the European Physical Society.<ref>{{Cite web |last=High Energy Particle Physics Division of EPS |title=Gribov Medal |url=https://eps-hepp.web.cern.ch/other-prize-awards.php |access-date=2026-02-07 |website=eps-hepp.web.cern.ch}}</ref> In 2006 he was awarded a two-year Sloan Research Fellowship. In 2013 he received the New Horizons in Physics Prize.<ref name=homepage/>
==Selected publications== * {{cite journal|arxiv=hep-th/0303060 |doi=10.1016/S0550-3213(03)00406-1 |title=The dilatation operator of conformal super-Yang–Mills theory |date=2003 |last1=Beisert |first1=N. |last2=Kristjansen |first2=C. |last3=Staudacher |first3=M. |journal=Nuclear Physics B |volume=664 |issue=1–2 |pages=131–184 }} * {{cite journal|arxiv=hep-th/0407277 |doi=10.1016/j.physrep.2004.09.007 |title=The dilatation operator of N=4 super Yang–Mills theory and integrability |date=2004 |last1=Beisert |first1=Niklas |journal=Physics Reports |volume=405 |issue=1–3 |pages=1–202 |bibcode=2004PhR...405....1B }} * {{cite journal|arxiv=hep-th/0502226 |doi=10.1007/s00220-006-1529-4 |title=The Algebraic Curve of Classical Superstrings on AdS<sub>5</sub> × S<sup>5</sup>{{space|1}}|date=2006 |last1=Beisert |first1=N. |last2=Kazakov |first2=V.A. |last3=Sakai |first3=K. |last4=Zarembo |first4=K. |journal=Communications in Mathematical Physics |volume=263 |issue=3 |pages=659–710 |bibcode=2006CMaPh.263..659B }} * {{cite journal|arxiv=0807.3228 |doi=10.1103/PhysRevD.78.126004 |title=Dual superconformal symmetry from AdS<sub>5</sub> × S<sup>5</sup> superstring integrability |date=2008 |last1=Beisert |first1=Niklas |last2=Ricci |first2=Riccardo |last3=Tseytlin |first3=Arkady A. |author-link3=Arkady Tseytlin |last4=Wolf |first4=Martin |journal=Physical Review D |volume=78 |issue=12 |article-number=126004 |bibcode=2008PhRvD..78l6004B }} * {{cite journal|arxiv=1012.3982 |doi=10.1007/s11005-011-0529-2 |title=Review of AdS/CFT Integrability: An Overview |date=2012 |last1=Beisert |first1=Niklas |last2=Ahn |first2=Changrim |last3=Alday |first3=Luis F. |last4=Bajnok |first4=Zoltán |last5=Drummond |first5=James M. |last6=Freyhult |first6=Lisa |last7=Gromov |first7=Nikolay |last8=Janik |first8=Romuald A. |last9=Kazakov |first9=Vladimir |last10=Klose |first10=Thomas |last11=Korchemsky |first11=Gregory P. |last12=Kristjansen |first12=Charlotte |last13=Magro |first13=Marc |last14=McLoughlin |first14=Tristan |last15=Minahan |first15=Joseph A. |last16=Nepomechie |first16=Rafael I. |last17=Rej |first17=Adam |last18=Roiban |first18=Radu |last19=Schäfer-Nameki |first19=Sakura |last20=Sieg |first20=Christoph |last21=Staudacher |first21=Matthias |last22=Torrielli |first22=Alessandro |last23=Tseytlin |first23=Arkady A. |last24=Vieira |first24=Pedro |last25=Volin |first25=Dmytro |last26=Zoubos |first26=Konstantinos |journal=Letters in Mathematical Physics |volume=99 |issue=1–3 |pages=3–32 |bibcode=2012LMaPh..99....3B }}
==References== <references/>
==External links== * {{cite web|url=https://www.youtube.com/watch?v=dyrWCq2pHDo | title=Niklas Beisert - Counterterms and E7 Symmetry in N=8 Supergravity | website=YouTube | date=26 March 2014 }} * {{cite web|url=https://www.youtube.com/watch?v=SWbXCLhYR4w | title=Niklas Beisert - Integrability in Planar Ads/CFT and Yangian Symmetry | website=YouTube | date=March 2019 }} * {{cite web|url=https://www.youtube.com/watch?v=iFRCm_tfxP8 | title=Niklas Beisert: "Contractions of Integrability Algebras and R-matrices" | website=YouTube | date=3 May 2022 }} * {{cite web|url=https://www.youtube.com/watch?v=jIMPJCzBqXk | title=Niklas Beisert: Planar Integrability and Yangian Symmetry in N=4 Supersymmetric Yang–Mills | website=YouTube | date=30 November 2021 }} * {{cite web|url=https://www.youtube.com/watch?v=QenQkna4oGU | title=Classical Lie Bialgebras for AdS/CFT Integrability by Contraction and Reduction by Niklas Beisert | website=YouTube | date=11 July 2023 }} * Niklas Beisert: [https://video.ethz.ch/speakers/lecture/9372bd38-7296-4636-a110-1d3de3eb23ba.html ''Teilchenphysik, Stringtheorie und Magnetismus. Einführungsvorlesung.''] Videoportal der ETH Zürich, 20. April 2012.
{{authority control}} {{DEFAULTSORT:Beisert, Niklas}} Category:1977 births Category:Living people Category:21st-century German physicists Category:German theoretical physicists Category:String theorists Category:Technical University of Munich alumni Category:Humboldt University of Berlin alumni Category:Academic staff of ETH Zurich Category:Sloan Research Fellows