Spring 2004 Prizes and Awards
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Non-Thermal Behavior in Conformal Boundary States
Prepared for submission to JHEP Non-Thermal Behavior in Conformal Boundary States Kevin Kuns and Donald Marolf Department of Physics, University of California, Santa Barbara, CA 93106, U.S.A. E-mail: [email protected], [email protected] Abstract: Cardy has recently observed that certain carefully tuned states of 1+1 CFTs on a timelike strip are periodic with period set by the light-crossing time. The states in question are defined by Euclidean time evolution of conformal boundary states associated with the particular boundary conditions imposed on the edges of the strip. We explain this behavior, and the associated lack of thermalization, by showing that such states are Lorentz-signature conformal transformations of the strip ground state. Taking the long- strip limit implies that states used to model thermalization on the Minkowski plane admit non-thermal conformal extensions beyond future infinity of the Minkowski plane, and thus retain some notion of non-thermal behavior at late times. We also comment on the holo- graphic description of these states. arXiv:1406.4926v2 [cond-mat.stat-mech] 6 Oct 2014 Contents 1 Introduction1 2 Periodicity and Tuned Rectangle States2 2.1 Tuned Rectangle States from Conformal Transformations2 2.2 One-Point Functions5 3 Conformal Transformations to the Thermal Minkowski Plane9 4 Discussion 12 A Holographic Description 13 1 Introduction The rapid change in a quantum system from a Hamiltonian H0 to a Hamiltonian H is known as a quantum quench. Quantum quenches are of experimental interest since they can be studied in laboratory systems involving ultracold atoms. They are also of theoretical interest as examples of out of equilibrium quantum systems whose thermalization, or lack thereof, can be used as a first step towards understanding thermalization in more general quantum systems. -
Photoluminescence and Resonance Raman Spectroscopy of MOCVD Grown
Photoluminescence and Resonance Raman Spectroscopy of MOCVD Grown GaAs/AlGaAs Core-Shell Nanowires A Thesis Submitted to the Faculty of Drexel University by Oren D. Leaer in partial fulllment of the requirements for the degree of Doctorate of Philosophy February 2013 © Copyright 2013 Oren D. Leaer. Figure 5.1 is reproduced from an article copyrighted by the American Physical Society and used with their permission. The original article may be found at: http://link.aps.org/doi/10.1103/PhysRevB.80.245324 Regarding only gure 5.1, the following notice is included as part of the terms of use: Readers may view, browse, and/or download material for temporary copying purposes only, provided these uses are for noncommercial personal purposes. Except as provided by law, this material may not be further reproduced, distributed, transmitted, modied, adapted, performed, displayed, published, or sold in whole or part, without prior written permission from the American Physical Society. The rest of this work is licensed under the terms of the Creative Commons Attribution-ShareAlike license Version 3.0. The license is available at: http://creativecommons.org/licenses/by-sa/3.0/. i Dedications To my family: my parents, my sister, and Bubby and Dan. Your support made this possible. Thank you. ii Acknowledgments It is with great pleasure that I am able to thank and acknowledge the individuals and organizations that helped me in the course of my graduate studies. I should begin by thanking my advisor, Dr. Spanier, and my committee, Drs. Livneh, May, Shih, Taheri, and Zavaliangos for supporting me through this rather long process. -
EPA Handbook: Optical and Remote Sensing for Measurement and Monitoring of Emissions Flux of Gases and Particulate Matter
EPA Handbook: Optical and Remote Sensing for Measurement and Monitoring of Emissions Flux of Gases and Particulate Matter EPA 454/B-18-008 August 2018 EPA Handbook: Optical and Remote Sensing for Measurement and Monitoring of Emissions Flux of Gases and Particulate Matter U.S. Environmental Protection Agency Office of Air Quality Planning and Standards Air Quality Assessment Division Research Triangle Park, NC EPA Handbook: Optical and Remote Sensing for Measurement and Monitoring of Emissions Flux of Gases and Particulate Matter 9/1/2018 Informational Document This informational document describes the emerging technologies that can measure and/or identify pollutants using state of the science techniques Forward Optical Remote Sensing (ORS) technologies have been available since the late 1980s. In the early days of this technology, there were many who saw the potential of these new instruments for environmental measurements and how this technology could be integrated into emissions and ambient air monitoring for the measurement of flux. However, the monitoring community did not embrace ORS as quickly as anticipated. Several factors contributing to delayed ORS use were: • Cost: The cost of these instruments made it prohibitive to purchase, operate and maintain. • Utility: Since these instruments were perceived as “black boxes.” Many instrument specialists were wary of how they worked and how the instruments generated the values. • Ease of use: Many of the early instruments required a well-trained spectroscopist who would have to spend a large amount of time to setup, operate, collect, validate and verify the data. • Data Utilization: Results from path integrated units were different from point source data which presented challenges for data use and interpretation. -
CERN Celebrates Discoveries
INTERNATIONAL JOURNAL OF HIGH-ENERGY PHYSICS CERN COURIER VOLUME 43 NUMBER 10 DECEMBER 2003 CERN celebrates discoveries NEW PARTICLES NETWORKS SPAIN Protons make pentaquarks p5 Measuring the digital divide pl7 Particle physics thrives p30 16 KPH impact 113 KPH impact series VISyN High Voltage Power Supplies When the objective is to measure the almost immeasurable, the VISyN-Series is the detector power supply of choice. These multi-output, card based high voltage power supplies are stable, predictable, and versatile. VISyN is now manufactured by Universal High Voltage, a world leader in high voltage power supplies, whose products are in use in every national laboratory. For worldwide sales and service, contact the VISyN product group at Universal High Voltage. Universal High Voltage Your High Voltage Power Partner 57 Commerce Drive, Brookfield CT 06804 USA « (203) 740-8555 • Fax (203) 740-9555 www.universalhv.com Covering current developments in high- energy physics and related fields worldwide CERN Courier (ISSN 0304-288X) is distributed to member state governments, institutes and laboratories affiliated with CERN, and to their personnel. It is published monthly, except for January and August, in English and French editions. The views expressed are CERN not necessarily those of the CERN management. Editor Christine Sutton CERN, 1211 Geneva 23, Switzerland E-mail: [email protected] Fax:+41 (22) 782 1906 Web: cerncourier.com COURIER Advisory Board R Landua (Chairman), P Sphicas, K Potter, E Lillest0l, C Detraz, H Hoffmann, R Bailey -
Federico Capasso “Physics by Design: Engineering Our Way out of the Thz Gap” Peter H
6 IEEE TRANSACTIONS ON TERAHERTZ SCIENCE AND TECHNOLOGY, VOL. 3, NO. 1, JANUARY 2013 Terahertz Pioneer: Federico Capasso “Physics by Design: Engineering Our Way Out of the THz Gap” Peter H. Siegel, Fellow, IEEE EDERICO CAPASSO1credits his father, an economist F and business man, for nourishing his early interest in science, and his mother for making sure he stuck it out, despite some tough moments. However, he confesses his real attraction to science came from a well read children’s book—Our Friend the Atom [1], which he received at the age of 7, and recalls fondly to this day. I read it myself, but it did not do me nearly as much good as it seems to have done for Federico! Capasso grew up in Rome, Italy, and appropriately studied Latin and Greek in his pre-university days. He recalls that his father wisely insisted that he and his sister become fluent in English at an early age, noting that this would be a more im- portant opportunity builder in later years. In the 1950s and early 1960s, Capasso remembers that for his family of friends at least, physics was the king of sciences in Italy. There was a strong push into nuclear energy, and Italy had a revered first son in En- rico Fermi. When Capasso enrolled at University of Rome in FREDERICO CAPASSO 1969, it was with the intent of becoming a nuclear physicist. The first two years were extremely difficult. University of exams, lack of grade inflation and rigorous course load, had Rome had very high standards—there were at least three faculty Capasso rethinking his career choice after two years. -
A First Law of Entanglement Rates from Holography
A First Law of Entanglement Rates from Holography Andy O'Bannon,1, ∗ Jonas Probst,2, y Ronnie Rodgers,1, z and Christoph F. Uhlemann3, 4, x 1STAG Research Centre, Physics and Astronomy, University of Southampton, Highfield, Southampton SO17 1BJ, U. K. 2Rudolf Peierls Centre for Theoretical Physics, University of Oxford, 1 Keble Road, Oxford OX1 3NP, U. K. 3Department of Physics, University of Washington, Seattle, WA 98195-1560, USA 4Mani L. Bhaumik Institute for Theoretical Physics, Department of Physics and Astronomy, University of California, Los Angeles, CA 90095, USA For a perturbation of the state of a Conformal Field Theory (CFT), the response of the entanglement entropy is governed by the so-called “first law" of entanglement entropy, in which the change in entanglement entropy is proportional to the change in energy. Whether such a first law holds for other types of perturbations, such as a change to the CFT La- grangian, remains an open question. We use holography to study the evolution in time t of entanglement entropy for a CFT driven by a t-linear source for a conserved U(1) current or marginal scalar operator. We find that although the usual first law of entanglement entropy may be violated, a first law for the rates of change of entanglement entropy and energy still holds. More generally, we prove that this first law for rates holds in holography for any asymptotically (d + 1)-dimensional Anti-de Sitter metric perturbation whose t dependence first appears at order zd in the Fefferman-Graham expansion about the boundary at z = 0. -
Research/Teaching Statement Gerard Awanou 1 Trivariate Splines
Research/Teaching statement Gerard Awanou I would like to describe in this statement the research I have done and comment on future directions. My work has been on trivariate splines for scattered data in- terpolation and numerical solution of partial differential equations, particularly, the Navier-Stokes equations. Another line of my research is mathematical finance. I have been interested in risk minimization in regime switching and two factor stochastic volatility models. I will describe my recent success in the construction of a family of mixed elements for three dimensional elasticity, a problem which was open for over 40 years. 1 Trivariate splines Let us assume that Ω is a three dimensional domain with a triangulation 4, i.e. the union of nonoverlapping tetrahedra with the property that the intersection of any two tetrahedra is either empty, a common vertex, a common edge or a common face. A spline function of degree d and smoothness r over Ω is a r times differentiable func- tion which is a polynomial of degree d when restricted to each tetrahedron. Finite elements are examples of spline functions. Scattered data interpolation A typical problem in surface design is the following: Given a set of scattered points in IR3, which are assumed to be at the vertices of a triangulation 4, find a spline with appropriate smoothness which interpolates the given data at the vertices. The resolution of this problem is by means of the construction of locally supported spline functions with high smoothness. I have implemented C1 spline functions in [6] on a special triangulation. -
Reading in Fall 2003'S Inside Physics
FFromrom thethe ChairChair available in the fall of 2001. Visits elcome to the first edition of our by prospective students nearly newsletter, created to keep us in doubled the number for the newsletter, created to keep us in previous year, and 33 new Wclose touch with our alumni and graduate students appeared in the friends. We’d like to hear your reaction: fall of 2001. We were especially friends. We’d like to hear your reaction: pleased that 30% of the entering what’s satisfying, what’s not, what’s class were women. I hope this is missing. Please let us know. no “fluke” and that we continue missing. Please let us know. to increase the participation of women in physics. The applica- tions for the fall of 2002 number Jim Allen over 500 and we look forward to Department Chair enrolling another strong class. OUR FUTURE Three new faculty joined our als. And Walter himself, the EXCITING TIMES ranks: Crystal Martin, an observa- founding director of the Institute “You can dismiss one Nobel Prize tional astrophysicist from Caltech; for Theoretical Physics, received as a statistical fluke,” Walter Kohn David Stuart, a high energy the 1998 prize in chemistry. remarked, “but a spate of three experimental physicist from Fermi signals something important and Lab; and Dik Bouwmeester from exciting happening at UCSB.” ENDOWED CHAIR Oxford, who works on quantum We are delighted that a chair in The three Nobels reflect UCSB’s optics and experimental quantum experimental physics has been longstanding commitment to information science. We continue endowed by Bruce and Susan excellence in science and engi- to search for new faculty in Worster. -
NMD, National Security Issues Featured at 2001 April Meeting In
April 2001 NEWS Volume 10, No. 4 A Publication of The American Physical Society http://www.aps.org/apsnews NMD, National Security Issues Featured Phase I CPU Report to be at 2001 April Meeting in Washington Discussed at Attendees of the 2001 APS April include a talk on how the news me- Meeting, which returns to Wash- dia cover science by David April Meeting ington, DC, this year, should arrive Kestenbaum, a self-described “es- The first phase of a new Na- just in time to catch the last of the caped physicist who is hiding out tional Research Council report of cherry blossom season in between at National Public Radio,” and a lec- the Committee on the Physics of scheduled sessions and special ture on entangled photons for the Universe (CPU) will be the events. The conference will run quantum information by the Uni- topic of discussion during a spe- April 28 through May 1, and will versity of Illinois’ Paul Kwiat. Other cial Sunday evening session at the feature the latest results in nuclear scheduled topics include imaging APS April Meeting in Washing- physics, astrophysics, chemical the cosmic background wave back- ton, DC. The session is intended physics, particles and fields, com- ground, searching for extra to begin the process of collect- putational physics, plasma physics, dimensions, CP violation in B me- ing input from the scientific the physics of beams, and physics sons, neutrino oscillations, and the community on some of the is- history, among other subdisci- amplification of atoms and light in The White House and (inset) some of its famous fictional sues outlined in the draft report, plines. -
Laser Focus World
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APS News, August-September 2019, Vol. 28, No. 8
STEP UP Preparing for Careers Leroy Apker Back Page: Openness and 02│ for Change 03│ with PIPELINE 05│ Award Finalists 08│ Security in Research Aug./Sept. 2019 • Vol. 28, No. 8 aps.org/apsnews A PUBLICATION OF THE AMERICAN PHYSICAL SOCIETY HONORS JOURNALS 2020 APS Medal for Exceptional Achievement in Physical Review Research Research Awarded to Myriam P. Sarachik Publishes its First Papers BY DAVID VOSS o launch its inaugural issue, Physical Review Research has hysicist Myriam P. Sarachik electron systems. I am very pleased has been selected to receive that she will receive the APS Medal T published its first content the 2020 APS Medal for for Exceptional Achievement in less than two months since opening P for submissions in June. Exceptional Achievement in Research. I’m especially pleased Research for her “fundamental that this honor goes to someone Demonstrating the journal’s contributions to the physics of who has also been so active in broad, multidisciplinary scope electronic transport in solids and promoting the core values of APS. covering all of physics and related molecular magnetism.” Not only is Myriam a past President fields of interest to the physics An APS Fellow, Sarachik is of the Society; she is also well- community, the first release of Distinguished Professor of Physics known for her efforts to defend peer-reviewed research articles at City College of New York. She human rights and the principles of includes advances in the areas of was President of APS in 2003 and diversity and inclusion in physics.” materials science, quantum infor- received the APS Oliver E. -
Physics Newsletter 2019
Harvard University Department of Physics Newsletter FALL 2019 A Microscopic Look At Quantum Materials it takes many physicists to solve quantum many-body problems CONTENTS Letter from the Chair ............................................................................................................1 Letter from the Chair ON THE COVER: An experiment-theory collaboration PHYSICS DEPARTMENT HIGHLIGHTS at Harvard investigates possible Letters from our Readers.. ..................................................................................................2 Dear friends of Harvard Physics, While Prof. Prentiss has been in our department since 1991 (she was theories for how quantum spins (red the second female physicist to be awarded tenure at Harvard), our and blue spheres) in a periodic The sixth issue of our annual Faculty Promotion ............................................................................................................... 3 next article features a faculty member who joined our department potential landscape interact with one Physics Newsletter is here! In Memoriam ........................................................................................................................ 4 only two years ago, Professor Roxanne Guenette (pp. 22-26). another to give rise to intriguing and Please peruse it to find out about potentially useful emergent Current Progress in Mathematical Physics: the comings and goings in our On page 27, Clare Ploucha offers a brief introduction to the Harvard phenomena. This is an artist’s