Lorentz Chair since 19552018

Tom Lubensky

2017

Renata Kallosh [lectures]

2016

Charles L. Kane [lectures]

2015

John B. Pendry [lectures]

2014

2013

H. Eugene Stanley

2012

Subir Sachdev [lectures]

2011

Roger Penrose

2010

Thomas A. Witten [lectures]

2009

2008

2007

Thomas W.B. Kibble

2006

David R. Nelson

2005

Peter Zoller [lectures]

2004

Leonard Susskind

2003

Leo P. Kadanoff

2002

John P. Preskill

2001

Howard C. Berg

2000

Chandra M. Varma

1999

Michael V. Berry

1998

1997

Bertrand I. Halperin

1996

Yoseph Imry

1995

N. David Mermin

1994

Julius Wess

1993

Michael E. Fisher

1992

Alexander F. Andreev

1991

Pierre C. Hohenberg

1990

Bernie J. Alder

1989

1988

1987

Raymond L. Orbach

1986

Philippe Nozières

1985

Ben Widom

1984

1983

Irwin Oppenheim

1982

Léon van Hove

1981

Ryogo Kubo

1980

Anatole Abragam

1979

Ezechiel G.D. Cohen

1978

1977

Victor F. Weisskopf

1976

Rudolf E. Peierls

1975

1974

1973

1972

1971

David Pines

1970

1969

Isaak M. Khalatnikov

1968

Elliott W. Montroll

1967

Christian Møller

1966

Herbert Fröhlich

1965

Wladyslaw Opechowski

1964

Oskar Klein

1963

Mark Kac

1962

Léon Rosenfeld

1961

Elliott W. Montroll

1960

1959

John G. Kirkwood

1958

Walter H. Heitler

1957

1956

John A. Wheeler [reminiscence]

1955

George E. Uhlenbeck

» portrait gallery « of Nobel laureate Lorentz professors Each year an eminent theoretical physicist holds the Lorentz Chair. The 2018 Lorentz professor was

Tom Lubensky, from the University of Pennsylvania. His stay in Leiden overlapped with the Lorentz Center workshop on Topology in Complex Fluids (22-25 May, 2018).Professor Lubensky gave three lectures on "Elasticity",

Tuesday May 8, 15, 29 (14:00-16:00 hours).

Location: De Sitterzaal, Oortgebouw.In addition, he presented a Colloquium Ehrenfestii on Wednesday evening May 16.

Lectures on ElasticityElasticity is often viewed as a "classical" subject that was largely closed as an area of research by the end of the 19th century. It is rarely taught in the undergraduate physics curriculum. It, however, remains essential for the vast materials industry, and developments of new materials, measurement techniques, and theory have brought it back as a dynamic research topic. These lectures will first review the fundamental concepts of elasticity theory, with a greater emphasis on nonlinearities than can be found in most physics text books, and the bulk and surface excitation spectrum it predicts. It will then discuss the elasticity of at least a subset of the specific materials: nematic elastomers, graphene, and smectic-A liquid crystals, and filamentous networks. Finally, it will consider the exotic elasticity of topological or near-topological mechanical networks.

Lecture I: Fundamentals A. Two views of elasticity: Lagrangian and phase of mass-density waves of crystals B. Non-linear stress and Strain C. Linearized Bulk phonon spectrum D. Surface Rayleigh waves Lecture II: Sample materials A. Nematic Elastomers: Ward identities and spontaneous broken symmetry B. Smectic-A liquid crystal and graphene: fluctuation breakdown of elastic response C. Filamentous networks Lecture III: Elasticity of Topological Mechanical Networks A. Introduction to topological mechanics B. Guest-Hutchinson modes and their consequences. C. Surface excitations D. Real materials and the breaking of topological constraints

Signatures of the Lorentz professors on the wall of our old colloquium room.

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