The University of Southampton
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Physics and Astronomy

Telephone:
+442380592076
Email:
a.obannon@soton.ac.uk

 

2019-20 Head of the Equality, Diversity, and Inclusion Committee for Physics and Astronomy

Work history

2015-present: Royal Society University Research Fellow and Senior Researcher, STAG Research Centre, University of Southampton

2013-15: Royal Society University Research Fellow, University of Oxford

2010-13: Research Associate (postdoc), DAMTP, University of Cambridge

2008-10: Research Fellow (postdoc), Max Planck Institute for Physics, Munich

2002-08: M.S. and Ph.D. in Physics, University of Washington, Seattle. Advisor: Prof. Andreas Karch.

2002-07: Jack Kent Cooke Graduate Scholar (full funding for graduate studies)

1998-2002: B.A. in Physics and the Writing Seminars, the Johns Hopkins University

Qualifications

BA Physics and the Writing Seminars, Johns Hopkins University (1998-2002)

PhD, University of Washington, Seattle (2002-2008, Advisor: Prof. Andreas Karch)

Research Fellow, Max Planck Institute for Physics, Munich, Germany (2008-10)

Research Associate, DAMTP, University of Cambridge (2010-13)

Royal Society University Research Fellow, University of Oxford (2013-15) and University of Southampton (2015-present)

Research

Research interests

My research is focused on strongly-interacting systems with unusual transport properties. An example from particle physics is the quark-gluon plasma, the hot soup of quarks an gluons that existed micro-seconds after the Big Bang, and is reproduced. The quark-gluon plasma has a shear viscosity lower than any other known fluid. An example from condensed matter physics are the ``strange metal’’ states of heavy fermion compounds and high-temperature superconductors. These materials have an electrical resistivity scaling as the square of temperature, unlike the linear scaling of most metals. Few reliable techniques exist to study such systems. As a result, the origins of their unusual properties remain mysterious.

To study such systems, I use a novel technique, discovered in string theory, called holography. Holography is the statement that certain strongly-interacting systems are equivalent, in a precise mathematical sense, to Einstein’s theory of gravity in one higher dimension. In other words, by calculating things in Einstein’s theory of gravity, we can learn about the quark-gluon plasma, strange metals, and more!

To be clear, the systems involved in holography are purely theoretical, and do not describe any particular real system. However, they have the potential to reveal general principles applicable to real systems. In other words, holography provides “toy models” that may reveal patterns characteristic of strongly-interacting systems. Indeed, holography already has a success story: all fluids described by holography have the same ratio of shear viscosity to entropy density, of roughly 0.1. That value is shockingly close to the value estimated for the quark-gluon plasma, which is also roughly 0.1. Holography thus revealed a general principle: a ratio of shear viscosity to entropy density of roughly 0.1 is characteristic of strongly-interacting fluids.

The goal of my research is to find similar ``universal’’ properties. Indeed, with various collaborators I have discovered substantial evidence for generic, if not completely universal, properties of the electrical resistivity, impurity physics, entanglement, and more in many holographic systems. Above all, I have learned that holography and string theory have much to teach us about strongly-interacting systems!

Teaching

2016-20 Module Coordinator for Final Year Synoptic Physics PHYS3017 and PHYS6015

2021 Module Coordinator for Linear Algebra for Physics PHYS1203

Publications

Jensen, Kristan and O'Bannon, Andy (2016) Constraint on defect and boundary renormalization group flows. Physical Review Letters, 116 (9), 1-5, [091601]. (doi:10.1103/PhysRevLett.116.091601).

Estes, John, Jensen, Kristan, O'Bannon, Andy, Tsatis, Efstratios and Wrase, Timm (2014) On holographic defect entropy. Journal of High Energy Physics, 2014 (84), 1-47. (doi:10.1007/JHEP05(2014)084).

Erdmenger, Johanna, Hoyos, Carlos, O'Bannon, Andrew, Papadimitriou, Ioannis, Probst, Jonas and Wu, Jackson (2017) Two-Point Functions in a Holographic Kondo Model. Journal of High Energy Physics, 2017 (3), [39]. (doi:10.1007/JHEP03(2017)039).

O'bannon, Andrew, Probst, Jonas and Papadimitriou, Ioannis (2016) A holographic two-impurity kondo model. Journal of High Energy Physics, 2016 (103), [103]. (doi:10.1007/JHEP01(2016)103).

Erdmenger, Johanna, Flory, Mario, Hoyos, Carlos, Newrzella, Max-Niklas, O'Bannon, Andrew and Wu, Jackson M.S. (2016) Holographic impurities and Kondo effect. Fortschritte der Physik, 64 (4-5), 322-329. (doi:10.1002/prop.201500079).

Erdmenger, Johanna, Hoyos, Carlos, O'Bannon, Andrew, Papadimitriou, Ioannis, Probst, Jonas and Wu, Jackson M.S. (2017) Holographic Kondo and Fano resonances. Physical Review D, 96 (2), [021901]. (doi:10.1103/PhysRevD.96.021901).

O'Bannon, Andrew, Probst, Jonas, Rodgers, Ronald, James and Uhlemann, Christoph F. (2017) A first law of entanglement rates from holography. Physical Review D, 96, [066028]. (doi:10.1103/PhysRevD.96.066028).

Gushterov, Nikola I., O'Bannon, Andrew and Rodgers, Ronald (2017) On holographic entanglement density. Journal of High Energy Physics, 2017 (10), [137]. (doi:10.1007/JHEP10(2017)137).

Gushterov, Nikola I., O’Bannon, Andy and Rodgers, Ronnie (2018) Holographic zero sound from spacetime-filling branes. Journal of High Energy Physics, 2018 (10), [76]. (doi:10.1007/JHEP10(2018)076).

Jensen, Kristan, O'Bannon, Andrew, Robinson, Brandon and Rodgers, Ronald, James (2019) From the Weyl anomaly to entropy of two-dimensional boundaries and defects. Physical Review Letters, 122, [241602]. (doi:10.1103/PhysRevLett.122.241602).

Estes, John, Krym, Darya, O'Bannon, Andrew, Robinson, Brandon and Rodgers, Ronnie (2019) Wilson surface central charge from holographic entanglement entropy. The Journal of High Energy Physics, 2019 (32), 1-52. (doi:10.1007/JHEP05(2019)032).

Evans, Nicholas, O'bannon, Andrew and Rodgers, Ronald, James (2020) Holographic Wilson lines as screened impurities. Journal of High Energy Physics, 2020 (3), [188]. (doi:10.1007/JHEP03(2020)188).

O'bannon, Andrew, Robinson, Brandon J, Chalabi, Adam and Sisti, Jacopo (2020) Central charges of 2d superconformal defects. Journal of High Energy Physics, 2020 (5), [95]. (doi:10.1007/JHEP05(2020)095).

Kumar, Prem, O'bannon, Andrew, Pribytok, Anton and Rodgers, Ronald (2021) Holographic coulomb branch solitons, quasinormal modes, and black holes. Journal of High Energy Physics, 2021 (05), [109]. (doi:10.1007/JHEP05(2021)109).

Fadafan, Kazem Bitaghsir, O'bannon, Andrew, Rodgers, Ronald and Russell, Matthew, James (2021) A Weyl semimetal from AdS/CFT with flavour. Journal of High Energy Physics, 2021 (4), [162]. (doi:10.1007/JHEP04(2021)162).

O'bannon, Andrew, Kumar, Prem, Rodgers, Ronald, Pribytok, Anton, Chalabi, Adam and Sisti, Jacopo (2021) Holographic entanglement entropy of the Coulomb branch. Journal of High Energy Physics, 2021 (4), [153]. (doi:10.1007/JHEP04(2021)153).

Andrei, N., Bissi, A., Buican, Matthew, O'bannon, Andrew and Robinson, Brandon J (2020) Boundary and defect CFT: open problems and applications. Journal of Physics A: Mathematical and Theoretical, 53 (45), [453002]. (doi:10.1088/1751-8121/abb0fe).

Hanada, Masanori, Holden, Jack, Knaggs, Matthew and O'bannon, Andrew (2022) Global symmetries and partial confinement. Journal of High Energy Physics, 2022 (3), [118]. (doi:10.1007/JHEP03(2022)118).

Chalabi, Adam, Herzog, Christopher P., Robinson, Brandon, Sisti, Jacopo and O'bannon, Andrew (2022) Weyl anomalies of four dimensional conformal boundaries and defects. Journal of High Energy Physics, 2022 (2), [166]. (doi:10.1007/JHEP02(2022)166).

Contact

Telephone: +44 (0) 23 8059 2076

Email: a.obannon@soton.ac.uk

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Telephone:
+442380593922
Email:
sadie.jones@soton.ac.uk

 

Sadie started work at the University of Southampton as the Outreach Leader in Astronomy in June 2011. Ths role involves co-ordination and management of all the astronomy outreach and public engagement activities from the Physics and Astronomy department. A large part of this role involves managing a team of undergraduate and PhD students who work with the astrodome aka #OurGreatestTeam. Sadie also organises Stargazing live events on campus, the SETI Cipher Challenge in July, Astrodome events in the local community and acts as a media correspondent on all things space related.

Sadie graduated with a PhD in Radio Astronomy from the University of Southampton in July 2012. Her research was an investigation of the radio emission from an active supermassive black hole at the centre of the galaxy NGC 4051. She used this data to determine if galaxy had a jet. 

Before coming to Southampton to do her PhD Sadie completed an MPhys in Astrophysics at Cardiff University. During her undergraduate studies she first discovered her love for all things outreach. This love was inspired primarily by working with the Faulkes Telescope team for her BSc and Masters projects and then from working at camps in America during the summers and doing weekend work in the planetarium at the local science discovery centre, Techniquest.

Publications

Carey, Max, Elcock, D., Saywell, J., Jones, S., Belal, M. and Freegarde, T. (2017) Velocimetry, cooling and rotation sensing by cold-atom matterwave interferometry. In Proceedings Quantum Information and Measurement (QIM) 2017: 5–7 April 2017, Paris, France. OSA. 3 pp . (In Press) (doi:10.1364/QIM.2017.QT5C.2).

Jones, S., Mchardy, I. and Maccarone, T.J. (2017) A comprehensive long term study of the radio and X-ray Variability of NGC 4051 Paper II. Monthly Notices of the Royal Astronomical Society, 465 (2), 1336-1347. (doi:10.1093/mnras/stw2810).

Contact

Telephone: +44 (0) 23 8059 3922

Email: sadie.jones@soton.ac.uk

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