Report for the Academic Year 2016–2017
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Lectures and Seminars, Trinity Term 2015
WEDNESDay 22 april 2015 • SUpplEMENT (2) TO NO 5092 • VOl 145 Gazette Supplement Lectures and Seminars, Trinity term 2015 Romanes Lecture 462 Experimental psychology Buddhist Studies Orthopaedics, rheumatology and COMPAS Musculoskeletal Sciences Hebrew and Jewish Studies University Administration pathology Hindu Studies and Services 462 pharmacology Museum of the History of Science Disability Lecture physiology, anatomy and Genetics islamic Studies population Health reuters institute for the Study of Humanities 462 psychiatry Journalism Foundation for law, Justice and Society TOrCH | The Oxford research Centre in Social Sciences 470 the Humanities learning institute Maison Française rothermere american institute interdisciplinary research Methods Oxford Martin School Classics Sanjaya lall Memorial Trust population ageing English language and literature anthropology and Museum Ethnography ian ramsey Centre History Saïd Business School linguistics, philology and phonetics Economics Colleges, Halls and Societies 482 Medieval and Modern languages Education Music interdisciplinary area Studies all Souls Oriental Studies international Development (Queen Balliol philosophy Elizabeth House) Green Templeton Theology and religion Oxford internet institute Keble Law lady Margaret Hall Mathematical, Physical and politics and international relations linacre Life Sciences 466 Social policy and intervention lincoln Socio-legal Studies Chemistry Magdalen Sociology Computer Science Mansfield Nuffield Earth Sciences Department for Continuing Queen’s Engineering -
1 Introduction
View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by CERN Document Server 1 TWENTY FIVE YEARS OF ASYMPTOTIC FREEDOM David J. Gross Institute For Theoretical Physics, UCSB Santa Barbara, California, USA e-mail: [email protected] Abstract th On the o ccasion of the 25 anniversary of Asymptotic Freedom, celebrated at the QCD Euorconference 98 on Quantum Chro dynamics, Montp ellier, July 1998, I describ ed the discovery of Asymptotic Freedom and the emergence of QCD. 1 INTRODUCTION Science progresses in a much more muddled fashion than is often pictured in history b o oks. This is esp ecially true of theoretical physics, partly b ecause history is written by the victorious. Con- sequently, historians of science often ignore the many alternate paths that p eople wandered down, the many false clues they followed, the many misconceptions they had. These alternate p oints of view are less clearly develop ed than the nal theories, harder to understand and easier to forget, esp ecially as these are viewed years later, when it all really do es make sense. Thus reading history one rarely gets the feeling of the true nature of scienti c development, in which the element of farce is as great as the element of triumph. The emergence of QCD is a wonderful example of the evolution from farce to triumph. During a very short p erio d, a transition o ccurred from exp erimental discovery and theoretical confusion to theoretical triumph and exp erimental con rmation. In trying to relate this story, one must be wary of the danger of the p ersonal bias that o ccurs as one lo oks back in time. -
Extracting Cosmology from High Resolution CMB Data *Focused on ACT and SO
Extracting cosmology from high resolution CMB data *focused on ACT and SO Jo Dunkley, Princeton University May 23, 2018 Jo Dunkley Cosmic Microwave Background T=2.7K ∆T/T ~0.00001 Also polarization: Rep.Two-point statistics: Prog. Phys. 81 (2018) 044901 Report on Progress TxT TxE BxB ExE Staggs, JD, Page 2018 review Figure 3. Example of recent CMB power spectra from [50–54]. Left. TT (top) and EE (bottom) data and power spectra plotted with logarithmic y axes. The TT and EE oscillations are out of phase by ∼π/2 as expected for acoustic oscillations (see section 1.4) since TT and EE trace density and velocity, respectively. The TT spectrum at low ℓ, corresponding to superhorizon scales at decoupling (see section 2.1), has post-decoupling contributions from gravitational redshifting of the photons as they pass through evolving potential wells, known as the integrated Sachs-Wolfe (ISW) effect [55, 56]. The EE spectrum peaks at higher ℓ than TT both because it lacks the ISW effect, and because the acoustic oscillation velocity gradients sourcing the polarization grow with k and thus with ℓ. The spectra are suppressed at large ℓ due to photon diffusion from smaller regions of space, also called Silk damping [57], and to geometric effects from compressing the 3d structure to 2d spectra. Right. TE with linear y axis. Since the ISW effect does not change the polarization, the negative peak at ℓ = 150 in TE confrmed that some of the largest scale features in the CMB are primordial, and not just late-time effects [58–60]. -
Color Screening in Quantum Chromodynamics Arxiv
Color Screening in Quantum Chromodynamics Alexei Bazavov, Johannes H. Weber Department of Computational Mathematics, Science and Engineering and Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824, USA October 6, 2020 Abstract We review lattice studies of the color screening in the quark-gluon plasma. We put the phenomena related to the color screening into the context of similar aspects of other physical systems (electromag- netic plasma or cold nuclear matter). We discuss the onset of the color screening and its signature and significance in the QCD transi- tion region, and elucidate at which temperature and to which extent the weak-coupling picture based on hard thermal loop expansion, po- tential nonrelativistic QCD, or dimensionally-reduced QCD quantita- tively captures the key properties of the color screening. We discuss the different regimes pertaining to the color screening and thermal arXiv:2010.01873v1 [hep-lat] 5 Oct 2020 dissociation of the static quarks in depth for various spatial correla- tion functions that are studied on the lattice, and clarify the status of their asymptotic screening masses. We finally discuss the screening correlation functions of dynamical mesons with a wide range of flavor and spin content, and how they conform with expectations for low- and high-temperature behavior. 1 Contents 1 Introduction3 2 Field theoretical foundations7 2.1 Partition function and Lagrangian . .7 2.2 Finite temperature field theory . 11 2.3 Lattice regularization . 14 2.4 Renormalization and weak coupling . 17 2.5 Light quarks . 19 2.6 Heavy quarks . 21 2.7 Implementation of QCD on the lattice . -
Iasinstitute for Advanced Study
IAInsti tSute for Advanced Study Faculty and Members 2012–2013 Contents Mission and History . 2 School of Historical Studies . 4 School of Mathematics . 21 School of Natural Sciences . 45 School of Social Science . 62 Program in Interdisciplinary Studies . 72 Director’s Visitors . 74 Artist-in-Residence Program . 75 Trustees and Officers of the Board and of the Corporation . 76 Administration . 78 Past Directors and Faculty . 80 Inde x . 81 Information contained herein is current as of September 24, 2012. Mission and History The Institute for Advanced Study is one of the world’s leading centers for theoretical research and intellectual inquiry. The Institute exists to encourage and support fundamental research in the sciences and human - ities—the original, often speculative thinking that produces advances in knowledge that change the way we understand the world. It provides for the mentoring of scholars by Faculty, and it offers all who work there the freedom to undertake research that will make significant contributions in any of the broad range of fields in the sciences and humanities studied at the Institute. Y R Founded in 1930 by Louis Bamberger and his sister Caroline Bamberger O Fuld, the Institute was established through the vision of founding T S Director Abraham Flexner. Past Faculty have included Albert Einstein, I H who arrived in 1933 and remained at the Institute until his death in 1955, and other distinguished scientists and scholars such as Kurt Gödel, George F. D N Kennan, Erwin Panofsky, Homer A. Thompson, John von Neumann, and A Hermann Weyl. N O Abraham Flexner was succeeded as Director in 1939 by Frank Aydelotte, I S followed by J. -
Neutrino Cosmology and Large Scale Structure
Neutrino cosmology and large scale structure Christiane Stefanie Lorenz Pembroke College and Sub-Department of Astrophysics University of Oxford A thesis submitted for the degree of Doctor of Philosophy Trinity 2019 Neutrino cosmology and large scale structure Christiane Stefanie Lorenz Pembroke College and Sub-Department of Astrophysics University of Oxford A thesis submitted for the degree of Doctor of Philosophy Trinity 2019 The topic of this thesis is neutrino cosmology and large scale structure. First, we introduce the concepts needed for the presentation in the following chapters. We describe the role that neutrinos play in particle physics and cosmology, and the current status of the field. We also explain the cosmological observations that are commonly used to measure properties of neutrino particles. Next, we present studies of the model-dependence of cosmological neutrino mass constraints. In particular, we focus on two phenomenological parameterisations of time-varying dark energy (early dark energy and barotropic dark energy) that can exhibit degeneracies with the cosmic neutrino background over extended periods of cosmic time. We show how the combination of multiple probes across cosmic time can help to distinguish between the two components. Moreover, we discuss how neutrino mass constraints can change when neutrino masses are generated late in the Universe, and how current tensions between low- and high-redshift cosmological data might be affected from this. Then we discuss whether lensing magnification and other relativistic effects that affect the galaxy distribution contain additional information about dark energy and neutrino parameters, and how much parameter constraints can be biased when these effects are neglected. -
Asymptotic Freedom and QCD–A Historical Perspective
Nuclear Physics B (Proc. Suppl.) 135 (2004) 193–211 www.elsevierphysics.com Asymptotic Freedom and QCD–a Historical Perspective David J. Grossa aKavli Institute for Theoretical Physics, University of California, Santa Barbara CA 93106-4030, USA I describe the theoretical scene in the 1960’s and the developments that led to the discovery of asymptotic freedom and to QCD. 1. INTRODUCTION there was a rather successful phenomenological theory, but not much new data. The strong in- It was a pleasure to attend Loops and Legs in teractions were where the experimental and theo- Quantum Field Theory, 2004, and to deliver a his- retical action was, particularly at Berkeley. They torical account of the origins of QCD. The talks were regarded as especially unfathomable. The delivered at this exciting meeting are a dramatic prevalent feeling was that it would take a very illustration of how far QCD has developed since long time to understand the strong interactions its inception thirty years ago. Current and forth- and that it would require revolutionary concepts. coming experiments are performing tests of QCD For a young graduate student this was clearly the with amazing precision, and theoretical calcula- major challenge. The feeling at the time was well tions of perturbative QCD are truly heroic. In expressed by Lev Landau in his last paper, called particular it was especially satisfying for me to “Fundamental Problems,” which appeared in a meet at this conference some of the people, who memorial volume to Wolfgang Pauli in 1959 [1] . over the last 30 years have calculated the two, In this paper he argued that quantum field the- − three and four loop corrections to the β function ory had been nullified by the discovery of the zero that we calculated to one loop order 31 years ago. -
Arxiv:2009.07772V2 [Astro-Ph.CO] 2 Nov 2020
Draft version November 3, 2020 Typeset using LATEX preprint2 style in AASTeX63 The Atacama Cosmology Telescope: Weighing distant clusters with the most ancient light Mathew S. Madhavacheril,1 Cristobal´ Sifon,´ 2 Nicholas Battaglia,3 Simone Aiola,4 Stefania Amodeo,3 Jason E. Austermann,5 James A. Beall,5 Daniel T. Becker,5 J. Richard Bond,6 Erminia Calabrese,7 Steve K. Choi,8, 3 Edward V. Denison,5 Mark J. Devlin,9 Simon R. Dicker,9 Shannon M. Duff,5 Adriaan J. Duivenvoorden,10 Jo Dunkley,11, 10 Rolando Dunner,¨ 12 Simone Ferraro,13 Patricio A. Gallardo,8 Yilun Guan,14 Dongwon Han,15 J. Colin Hill,16, 4 Gene C. Hilton,5 Matt Hilton,17, 18 Johannes Hubmayr,5 Kevin M. Huffenberger,19 John P. Hughes,20 Brian J. Koopman,21 Arthur Kosowsky,14 Jeff Van Lanen,5 Eunseong Lee,22 Thibaut Louis,23 Amanda MacInnis,15 Jeffrey McMahon,24, 25, 26, 27 Kavilan Moodley,17, 18 Sigurd Naess,4 Toshiya Namikawa,28 Federico Nati,29 Laura Newburgh,21 Michael D. Niemack,8, 3 Lyman A. Page,10 Bruce Partridge,30 Frank J. Qu,28 Naomi C. Robertson,31, 32 Maria Salatino,33, 34 Emmanuel Schaan,13 Alessandro Schillaci,35 Benjamin L. Schmitt,36 Neelima Sehgal,15 Blake D. Sherwin,28, 32 Sara M. Simon,37 David N. Spergel,4, 11 Suzanne Staggs,10 Emilie R. Storer,10 Joel N. Ullom,5 Leila R. Vale,5 Alexander van Engelen,38 Eve M. Vavagiakis,8 Edward J. Wollack,39 and Zhilei Xu9 1Centre for the Universe, Perimeter Institute, Waterloo, ON N2L 2Y5, Canada 2Instituto de F´ısica, Pontificia Universidad Cat´olica de Valpara´ıso,Casilla 4059, Valpara´ıso,Chile 3Department of Astronomy, Cornell University, Ithaca, NY 14853 USA 4Center for Computational Astrophysics, Flatiron Institute, 162 5th Avenue, New York, NY, USA 10010 5NIST Quantum Devices Group, 325 Broadway Mailcode 817.03, Boulder, CO, USA 80305 6Canadian Institute for Theoretical Astrophysics, University of Toronto, 60 St. -
Twenty Five Years of Asymptotic Freedom
TWENTY FIVE YEARS OF ASYMPTOTIC FREEDOM1 David J. Gross Institute For Theoretical Physics, UCSB Santa Barbara, California, USA e-mail: [email protected] Abstract On the occasion of the 25th anniversary of Asymptotic Freedom, celebrated at the QCD Euorconference 98 on Quantum Chrodynamics, Montpellier, July 1998, I described the discovery of Asymptotic Freedom and the emergence of QCD. 1 INTRODUCTION Science progresses in a much more muddled fashion than is often pictured in history books. This is especially true of theoretical physics, partly because history is written by the victorious. Con- sequently, historians of science often ignore the many alternate paths that people wandered down, the many false clues they followed, the many misconceptions they had. These alternate points of view are less clearly developed than the final theories, harder to understand and easier to forget, especially as these are viewed years later, when it all really does make sense. Thus reading history one rarely gets the feeling of the true nature of scientific development, in which the element of farce is as great as the element of triumph. arXiv:hep-th/9809060v1 10 Sep 1998 The emergence of QCD is a wonderful example of the evolution from farce to triumph. During a very short period, a transition occurred from experimental discovery and theoretical confusion to theoretical triumph and experimental confirmation. In trying to relate this story, one must be wary of the danger of the personal bias that occurs as one looks back in time. It is not totally possible to avoid this. Inevitably, one is fairer to oneself than to others, but one can try. -
Oxford Physics Newsletter
Spring 2011, Number 1 Department of Physics Newsletter elcome to the first edition of Oxford Physics creates new solar-cell the Department technology Wof Physics Newsletter. In this takes place to generate free electrons, which edition, we describe some of Henry Snaith contribute to a current in an external circuit. The the wide range of research original dye-sensitised solar cell used a liquid currently being carried out in The ability to cheaply and efficiently harness the power of electrolyte as the “p-type” material. the Oxford Physics Department, the Sun is crucial to trying to slow The work at Oxford has focused on effectively and also describe some of down climate change. Solar cells replacing the liquid electrolyte with p-type the other activities where we aim to produce electricity directly from sunlight, organic semiconductors. This solid-state system seek to engage the public in but are currently too expensive to have significant offers great advantages in ease of processing and impact. A new “spin-out” company, Oxford science and communicate with scalability. Photovoltaics Ltd, has recently been created to potential future physicists. I commercialise solid-state dye-sensitised solar Over the next two to three years, Oxford hope you enjoy reading it. If you cell technology developed at the Clarendon Photovoltaics will scale the technology from laboratory to production line, with the projected have passed through Oxford Laboratory. market being photovoltaic cells integrated into Physics as an undergraduate In conventional photovoltaics, light is absorbed windows and cladding for buildings. or postgraduate student, or in in the bulk of a slab of semiconducting material any other capacity, we would and the photogenerated charge is collected at metallic electrodes. -
Year in Review
Year in review For the year ended 31 March 2017 Trustees2 Executive Director YEAR IN REVIEW The Trustees of the Society are the members Dr Julie Maxton of its Council, who are elected by and from Registered address the Fellowship. Council is chaired by the 6 – 9 Carlton House Terrace President of the Society. During 2016/17, London SW1Y 5AG the members of Council were as follows: royalsociety.org President Sir Venki Ramakrishnan Registered Charity Number 207043 Treasurer Professor Anthony Cheetham The Royal Society’s Trustees’ report and Physical Secretary financial statements for the year ended Professor Alexander Halliday 31 March 2017 can be found at: Foreign Secretary royalsociety.org/about-us/funding- Professor Richard Catlow** finances/financial-statements Sir Martyn Poliakoff* Biological Secretary Sir John Skehel Members of Council Professor Gillian Bates** Professor Jean Beggs** Professor Andrea Brand* Sir Keith Burnett Professor Eleanor Campbell** Professor Michael Cates* Professor George Efstathiou Professor Brian Foster Professor Russell Foster** Professor Uta Frith Professor Joanna Haigh Dame Wendy Hall* Dr Hermann Hauser Professor Angela McLean* Dame Georgina Mace* Dame Bridget Ogilvie** Dame Carol Robinson** Dame Nancy Rothwell* Professor Stephen Sparks Professor Ian Stewart Dame Janet Thornton Professor Cheryll Tickle Sir Richard Treisman Professor Simon White * Retired 30 November 2016 ** Appointed 30 November 2016 Cover image Dancing with stars by Imre Potyó, Hungary, capturing the courtship dance of the Danube mayfly (Ephoron virgo). YEAR IN REVIEW 3 Contents President’s foreword .................................. 4 Executive Director’s report .............................. 5 Year in review ...................................... 6 Promoting science and its benefits ...................... 7 Recognising excellence in science ......................21 Supporting outstanding science ..................... -
J&N (UK) Ltd Rights Guide – London 2019
J&N (UK) Ltd Rights Guide – London 2019 Zoë Nelson Rights Director [email protected] For Portugal, Brazil, Eastern Europe, Far East, Greece, Turkey & Israel Ellis Hazelgrove Rights Executive [email protected] Janklow & Nesbit (UK) Ltd 13a Hillgate Street London W8 7SP www.janklowandnesbit.co.uk FICTION Carr, Jonathan / MAKE ME A CITY Chivers, Greg / THE CRYING MACHINE Cummings, Harriet / THE LAST OF US de Rosa, Domenica / THE SECRET OF VILLA SERENA Griffiths, Elly / THE STONE CIRCLE Hoffman, Jilliane / NEMESIS Johnstone, C.L. / MIRRORLAND Kimberling, Brian / GOULASH Legge, Laura / CALA Millwood Hargrave, Kiran / THE MERCIES Monks Takhar, Helen / PRECIOUS YOU Porter, Henry / WHITE HOT SILENCE Thomas, Joe / PLAYBOY Way, Camilla / WHO KILLED RUBY Weinberg, Kate /THE TRUANTS NON-FICTION Benjamin, A K / LET ME NOT BE MAD: A Story of Unravelling Minds Berger, Lynn / SECOND THOUGHTS: Reflections on Having and Being a Second Child Blauw, Sanne / THE BIGGEST BESTSELLER OF ALL TIME (WITH THIS TITLE): How Numbers Lead and Mislead Us Bregman, Rutger / THE BANALITY OF GOOD Chatterjee, Dr Rangan / THE STRESS SOLUTION: The 4 Steps to Reset Your Body, Mind, Relationships and Purpose Chivers, Tom / THE AI DOES NOT HATE YOU: Superintelligence, Rationality and the Race to Save the World Couchman, Danie / AFLOAT: A Memoir Dartnell, Lewis / ORIGINS: How the Earth Made Us Dunkley, Jo / OUR UNIVERSE: An Astronomer’s Guide Etchells, Pete / LOST IN A GOOD GAME: Why We Play Video Games and What They Do to Us Ewens, Hannah Rose / FANGIRL: The Untapped