Holger Bech Nielsen (born 25 August 1941) is a Danish

theoretical physicist Theoretical physics is a branch of physics that employs mathematical models and abstractions of physical objects and systems to rationalize, explain and predict natural phenomena. This is in contrast to experimental physics, which uses experime ...

and

professor emeritus ''Emeritus'' (; female: ''emerita'') is an adjective used to designate a retired chair, professor, pastor, bishop, pope, director, president, prime minister, rabbi, emperor, or other person who has been "permitted to retain as an honorary title ...

at the

Niels Bohr Institute The Niels Bohr Institute (Danish: ''Niels Bohr Institutet'') is a research institute of the University of Copenhagen. The research of the institute spans astronomy, geophysics, nanotechnology, particle physics, quantum mechanics and biophys ...

, at the

University of Copenhagen The University of Copenhagen ( da, Københavns Universitet, KU) is a prestigious public university, public research university in Copenhagen, Copenhagen, Denmark. Founded in 1479, the University of Copenhagen is the second-oldest university in ...

, where he started studying physics in 1961.

Work

Nielsen has made original contributions to theoretical

particle physics Particle physics or high energy physics is the study of fundamental particles and forces that constitute matter and radiation. The fundamental particles in the universe are classified in the Standard Model as fermions (matter particles) an ...

, specifically in the field of

string theory In physics, string theory is a theoretical framework in which the point-like particles of particle physics are replaced by one-dimensional objects called strings. String theory describes how these strings propagate through space and intera ...

. Independently of Nambu and

Susskind Susskind (German ''Süßkind'' "sweet child", variants ''Suskind'', ''Suskin'', '' Siskind'', '' Ziskind'', '' Ziskin'', etc.) is a Jewish surname of German origin. History Süsskind in the German medieval period was a given name, not a surname, ...

, he was the first to propose that the Veneziano model was actually a theory of strings, leading him to be considered among the fathers of string theory. He was awarded the Humboldt Prize in 2001 for his research. Several physics concepts are named after him, e.g.

Nielsen–Olesen vortex In theoretical physics, a Nielsen–Olesen vortex is a point-like object localized in two spatial dimensions or, equivalently, a classical solution of field theory with the same property. This particular solution occurs if the configuration space ...

and the Nielsen-Ninomiya no-go theorem for representing chiral fermions on the lattice. In the original Dual-Models, which later would be recognized as the origins of string theory, the Koba-Nielsen variables are also named after him and his collaborator Ziro Koba. Nielsen is known in Denmark for his enthusiastic public lectures on physics and string theory, and he is often interviewed in daily news, especially on matters regarding particle physics. In a series of papers uploaded to arXiv.org in 2009, Nielsen and fellow physicist Masao Ninomiya proposed a radical theory to explain the seemingly improbable series of failures preventing the

Large Hadron Collider The Large Hadron Collider (LHC) is the world's largest and highest-energy particle collider. It was built by the European Organization for Nuclear Research (CERN) between 1998 and 2008 in collaboration with over 10,000 scientists and hundr ...

(LHC) from becoming operational. The collider was intended to be used to find evidence of the hypothetical

Higgs boson The Higgs boson, sometimes called the Higgs particle, is an elementary particle in the Standard Model of particle physics produced by the quantum excitation of the Higgs field, one of the fields in particle physics theory. In the Stan ...

particle. They suggested that the particle might be so abhorrent to nature that its creation would ripple backward through time and stop the collider before it could create one, in a fashion similar to the

time travel Time travel is the concept of movement between certain points in time, analogous to movement between different points in space by an object or a person, typically with the use of a hypothetical device known as a time machine. Time travel is a ...

Grandfather paradox. Subsequently the LHC claimed the discovery of Higgs boson on 4 July 2012. Nielsen is a member of the

Norwegian Academy of Science and Letters The Norwegian Academy of Science and Letters ( no, Det Norske Videnskaps-Akademi, DNVA) is a learned society based in Oslo, Norway. Its purpose is to support the advancement of science and scholarship in Norway. History The Royal Frederick Unive ...

References

External links

Holger Bech Nielsen
personal page.
Teorien om alting/The Theory of Everything
Internet Movie Database.

webpage about the book in Danish. {{DEFAULTSORT:Nielsen, Holger Bech 1941 births Living people Danish physicists String theorists Particle physicists University of Copenhagen alumni University of Copenhagen faculty Members of the Norwegian Academy of Science and Letters Theoretical physicists

Work

See also

References

Further reading

External links