CURRICULUM VITAE March 2019
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The Flexibility of Optical Metrics
Home Search Collections Journals About Contact us My IOPscience The flexibility of optical metrics This content has been downloaded from IOPscience. Please scroll down to see the full text. 2016 Class. Quantum Grav. 33 165008 (http://iopscience.iop.org/0264-9381/33/16/165008) View the table of contents for this issue, or go to the journal homepage for more Download details: IP Address: 128.220.159.5 This content was downloaded on 08/05/2017 at 21:52 Please note that terms and conditions apply. You may also be interested in: Induced optical metric in the non-impedance-matched media S A Mousavi, R Roknizadeh and S Sahebdivan Lux in obscuro: photon orbits of extremal black holes revisited Fech Scen Khoo and Yen Chin Ong Hidden geometries in nonlinear theories: a novel aspect of analogue gravity E Goulart, M Novello, F T Falciano et al. Black holes and stars in Horndeski theory Eugeny Babichev, Christos Charmousis and Antoine Lehébel Singularities in GR coupled to nonlinearelectrodynamics M Novello, S E Perez Bergliaffa and J M Salim Parity horizons in shape dynamics Gabriel Herczeg Numerical methods for finding stationary gravitational solutions Óscar J C Dias, Jorge E Santos and Benson Way Static spherically symmetric solutions in mimetic gravity: rotation curves and wormholes Ratbay Myrzakulov, Lorenzo Sebastiani, Sunny Vagnozzi et al. Supersymmetric solutions of N = (2, 0) topologically massive supergravity Nihat Sadik Deger and George Moutsopoulos Classical and Quantum Gravity Class. Quantum Grav. 33 (2016) 165008 (14pp) doi:10.1088/0264-9381/33/16/165008 -
Newsletter 110 ª June 2002 NEWSLETTER
Newsletter 110 ª June 2002 NEWSLETTER The American Astronomical Societys2000 Florida Avenue, NW, Suite 400sWashington, DC [email protected] AAS NEWS PRESIDENT’S COLUMN Wallerstein is Anneila I. Sargent, Caltech, [email protected] My term as President of the American Astronomical Society Russell Lecturer will end with our meeting in Albuquerque in June 2002. Usually This year, the AAS this letter would be the appropriate place to consider my bestows its highest honor, expectations and goals when I took up the gavel and compare the Henry Norris Russell these with what actually happened. Lectureship on George The events of 11 September 2001 caused me to write that kind Wallerstein, Professor of reflective letter in the December issue of this Newsletter.I Emeritus of Astronomy at won’t repeat myself here except to note that at that time there the University of seemed to be less enthusiasm to fund research in the physical Washington. Wallerstein is sciences than we had grown to expect when I took office. recognized in the award citation for “...his As I write this column, the prospects look much less bleak. In contributions to our another part of this Newsletter, Kevin Marvel discusses how understanding of the astronomy fared in the President’s FY ’03 budget request. George Wallerstein of the University of NASA’s Office of Space Science is doing very well indeed. In Washington will deliver his Russell Lecture abundances of the at the Seattle Meeting in January 2003. elements in stars and fact, the OSS budget has been increasing steadily since 1996 and clusters. -
Contopoulos G. Adventures in Order and Chaos.. a Scientific
ADVENTURES IN ORDER AND CHAOS ASTROPHYSICS AND SPACE SCIENCE LIBRARY VOLUME 313 EDITORIAL BOARD Chairman W.B. BURTON, National Radio Astronomy Observatory, Charlottesville, Virginia, U.S.A. ([email protected]); University of Leiden, The Netherlands ([email protected]) Executive Committee J. M. E. KUIJPERS, Faculty of Science, Nijmegen, The Netherlands E. P. J. VAN DEN HEUVEL, Astronomical Institute, University of Amsterdam, The Netherlands H. VAN DER LAAN, Astronomical Institute, University of Utrecht, The Netherlands MEMBERS I. APPENZELLER, Landessternwarte Heidelberg-Königstuhl, Germany J. N. BAHCALL, The Institute for Advanced Study, Princeton, U.S.A. F. BERTOLA, Universitá di Padova, Italy J. P. CASSINELLI, University of Wisconsin, Madison, U.S.A. C. J. CESARSKY, Centre d'Etudes de Saclay, Gif-sur-Yvette Cedex, France O. ENGVOLD, Institute of Theoretical Astrophysics, University of Oslo, Norway R. McCRAY, University of Colorado, JILA, Boulder, U.S.A. P. G. MURDIN, Institute of Astronomy, Cambridge, U.K. F. PACINI, Istituto Astronomia Arcetri, Firenze, Italy V. RADHAKRISHNAN, Raman Research Institute, Bangalore, India K. SATO, School of Science, The University of Tokyo, Japan F. H. SHU, University of California, Berkeley, U.S.A. B. V. SOMOV, Astronomical Institute, Moscow State University, Russia R. A. SUNYAEV, Space Research Institute, Moscow, Russia Y. TANAKA, Institute of Space & Astronautical Science, Kanagawa, Japan S. TREMAINE, CITA, Princeton University, U.S.A. N. O. WEISS, University of Cambridge, U.K. ADVENTURES IN ORDER AND CHAOS A Scientific Autobiography By GEORGE CONTOPOULOS Member of the Academy of Athens, Research Centre of Astronomy, Athens, Greece KLUWER ACADEMIC PUBLISHERS DORDRECHT / BOSTON / LONDON A C.I.P. -
Analogue Stochastic Gravity Phenomena in Two-Component Bose-Einstein Condensates: Sound Cone fluctuations
Analogue stochastic gravity phenomena in two-component Bose-Einstein condensates: Sound cone fluctuations Wei-Can Syu,∗ Da-Shin Lee,y and Chi-Yong Linz Department of Physics, National Dong-Hwa University, Hualien, Taiwan, Republic of China (Dated: July 2, 2019) We investigate the properties of the condensates of cold atoms at zero temperature in the tunable binary Bose-Einstein condensate system with a Rabi transition between atomic hyperfine states. We use this system to examine the effect of quantum fluctuations in a tunable quantum gas on phonon propagation. We show that the system can be represented by a coupled two-field model of a gapless phonon and a gapped mode, which are analogous to the Goldstone and Higgs particles in particle physics. We then further trace out the gapped modes to give an effective purely phononic theory using closed-time-path formalism. In particular, we are interested in the sound cone fluctuations due to the variation of the speed-of-sound acoustic metric, induced by quantum fluctuations of the gapped modes. These fluctuations can be interpreted as inducing a stochastic space-time, and thus are regarded as analogue phenomena of light cone fluctuations presumably arising from quantum gravity effects. The effects of fluctuations can be displayed in the variation in the travel time of sound waves. We suggest the relevant experiments to discuss the possibility of experimental observations. PACS numbers: 04.62.+v, 03.75.Kk,03.65.Yz I. INTRODUCTION less, these stochastic spacetimes can arise also from the quantum nature of the gravitational field, namely gravi- tons. One particularly striking effect of spacetime geom- Analog models of gravity are the attempts to use lab- etry fluctuations is that a fixed light cone does not exist, oratory systems for modeling various phenomena of gen- giving rise to light cone fluctuations with their tiny effects eral relativity (e.g., black holes or cosmological geome- on the blurring of the images of astronomical objects, or tries), which require a deeper understanding of (stochas- luminosity fluctuations [4{7]. -
Report of MARIO NOVELLO (2012)
Report of MARIO NOVELLO (2012) List of papers and some comments on the lines of research I have been developing and the ones I shall be developing in the coming years. 1. Gordon Metric Revisited, M. Novello and E. Bittencourt, to be published in Phys.Rev. D. We show that Gordon metric belongs to a larger class of geometries, which are responsible to describe the paths of accelerated bodies in moving dielectrics as geodesics in a metric $\hat q_{\mu\nu}$ different from the background one. This map depends only on the background metric and on the motion of the bodies under consideration. As a consequence, this method describes a more general property that concerns the elimination of any kind of force acting on bodies by a suitable change of the substratum metric. 2. What is the origin of the mass of the Higgs boson? M. Novello and E. Bittencourt, Phys.Rev. D86 (2012) 063510. The purpose of this paper is to present a unified description of mass generation mechanisms that have been investigated so far and that are called the Mach and Higgs proposals. In our mechanism, gravity acts merely as a catalyst and the final expression of the mass depends neither on the intensity nor on the particular properties of the gravitational field. We shall see that these two strategies to provide mass for all bodies that operate independently and competitively can be combined into a single unified theoretical framework. As a consequence of this new formulation we are able to present an answer to the question: what is the origin of the mass of the Higgs boson? This paper is a continuation of the program of the analysis of the mechanisms of mass generation that was started in 2011 with the work presented in CQG entitled: 3. -
CURRICULUM VITAE June, 2016 Hu, Bei-Lok Bernard Professor Of
CURRICULUM VITAE June, 2016 Hu, Bei-Lok Bernard Professor of Physics, University of Maryland, College Park 胡悲樂 Founding Fellow, Joint Quantum Institute, Univ. Maryland and NIST Founding Member, Maryland Center for Fundamental Physics, UMD. I. PERSONAL DATA Date and Place of Birth: October 4, 1947, Chungking, China. Citizenship: U.S.A. Permanent Address: 3153 Physical Sciences Complex Department of Physics, University of Maryland, College Park, Maryland 20742-4111 Telephone: (301) 405-6029 E-mail: [email protected] Fax: MCFP: (301) 314-5649 Physics Dept: (301) 314-9525 UMd Physics webpage: http://umdphysics.umd.edu/people/faculty/153-hu.html Research Groups: - Gravitation Theory (GRT) Group: http://umdphysics.umd.edu/research/theoretical/87gravitationaltheory.html - Quantum Coherence and Information (QCI) Theory Group: http://www.physics.umd.edu/qcoh/index.html II. EDUCATION Date School Location Major Degree 1958-64 Pui Ching Middle School Hong Kong Science High School 1964-67 University of California Berkeley Physics A.B. 1967-69 Princeton University Princeton Physics M.A. 1969-72 Princeton University Princeton Physics Ph.D. III. ACADEMIC EXPERIENCE Date Institution Position June 1972- Princeton University Research Associate Jan. 1973 Princeton, N.J. 08540 Physics Department Jan. 1973- Institute for Advanced Study Member Aug. 1973 Princeton, N.J. 08540 School of Natural Science Sept.1973- Stanford University Research Associate Aug. 1974 Stanford, Calif. 94305 Physics Department Sept.1974- University of Maryland Postdoctoral Fellow Jan. 1975 College Park, Md. 20742 Physics & Astronomy Jan. 1975- University of California Research Mathematician Sept.1976 Berkeley, Calif. 94720 Mathematics Department Oct. 1976- Institute for Space Studies Research Associate May 1977 NASA, New York, N.Y. -
Reflection Coefficient for Superresonant Scattering
Reflection coefficient for superresonant scattering Soumen Basak∗ and Parthasarathi Majumdar† The Institute Of Mathematical sciences Chennai-6000113, INDIA We investigate superresonant scattering of acoustic disturbances from a rotating acoustic black hole in the low frequency range. We derive an expression for the reflection coefficient, exhibiting its frequency dependence in this regime. I. INTRODUCTION Progress in understanding black hole radiance, both in the semiclassical and quantum gravitational regimes, have suffered greatly in the past, due to the lack of experimental feedback. Black hole radiance consists of spontaneous radiation (Hawking radiation) [1]as well as stimulated emission (superradiance) [2], [3], [4], [5]. For astrophysical black holes, the Hawking temperature is invariably smaller than the Cosmic Microwave Background temperature. So the black hole mostly accretes rather than radiates spontaneously. Similarly, superradiant emission is also hard to observe from within a background of x-rays being emitted from accretion processes. Due to these reasons physicists have been looking for alternative physical models of gravity so that experiments can be devised for indirect verification of phenomena that are predicted by the semiclassical theory of gravity. These alternative physical models are called analog models of gravity. Among the first of such analog gravity models, Unruh’s [6] was the pioneering idea of analog models based on fluid mechanics. The idea of such models arose from a remarkable observation regarding sound wave propagation in a fluid in motion. Unruh showed that if the fluid is barotropic and inviscid, and the flow is irrotational, the equation of motion of the acoustic fluctuations of the velocity potential is identical to that of a minimally coupled massless scalar field in an effective (3+1) dimensional curved spacetime, and is given by, 1 µν ✷Ψ= ∂µ √ g g ∂ν Ψ=0 (1) √ g − − where gµν is the ‘acoustic’ metric and Ψ is the fluctuation of the velocity potential. -
CURRICULUM VITAE February 28, 2014
CURRICULUM VITAE February 28, 2014 Hu, Bei-Lok Bernard Professor of Physics, University of Maryland, College Park 胡悲樂 Founding Fellow, Joint Quantum Institute, Univ. Maryland and NIST Founding Member, Maryland Center for Fundamental Physics, UMd. I. PERSONAL DATA Date and Place of Birth: October 4, 1947, Chungking, China. Citizenship: U.S.A. Permanent Address: 4209 John S. Toll Building / 3153 Physical Sciences Complex Department of Physics, University of Maryland, College Park, Maryland 20742-4111 Telephone: (301) 405-6029 E-mail: [email protected] FAX: MCFP: (301) 314-5649 Physics Dept: (301) 314-9525 UMd Physics webpage: http://umdphysics.umd.edu/people/faculty/153-hu.html Research Groups: - Gravitation Theory (GRT) Group: http://umdphysics.umd.edu/research/theoretical/87gravitationaltheory.html - Quantum Coherence and Information (QCI) Theory Group: http://www.physics.umd.edu/qcoh/index.html II. EDUCATION Date School Location Major Degree 1958-64 Pui Ching Middle School Hong Kong Science High School 1964-67 University of California Berkeley Physics A.B. 1967-69 Princeton University Princeton Physics M.A. 1969-72 Princeton University Princeton Physics Ph.D. III. ACADEMIC EXPERIENCE Date Institution Position June 1972- Princeton University Research Associate Jan. 1973 Princeton, N.J. 08540 Physics Department Jan. 1973- Institute for Advanced Study Member Aug. 1973 Princeton, N.J. 08540 School of Natural Science Sept.1973- Stanford University Research Associate Aug. 1974 Stanford, Calif. 94305 Physics Department Sept.1974- University of Maryland Postdoctoral Fellow Jan. 1975 College Park, Md. 20742 Physics & Astronomy Jan. 1975- University of California Research Mathematician Sept.1976 Berkeley, Calif. 94720 Mathematics Department Oct. 1976- Institute for Space Studies Research Associate May 1977 NASA, New York, N.Y. -
Gordon Metric Revisited
Gordon Metric Revisited M. Novello∗† and E. Bittencourt‡ Instituto de Cosmologia Relatividade Astrofisica ICRA - CBPF Rua Dr. Xavier Sigaud, 150, CEP 22290-180, Rio de Janeiro, Brazil (Dated: November 4, 2018) We show that Gordon metric belongs to a larger class of geometries, which are responsible to describe the paths of accelerated bodies in moving dielectrics as geodesics in a metricq ˆµν different from the background one. This map depends only on the background metric and on the motion of the bodies under consideration. As a consequence, this method describes a more general property that concerns the elimination of any kind of force acting on bodies by a suitable change of the substratum metric. PACS numbers: 04.20.-q I. INTRODUCTION which led to the geometrization of the gravitational field as it was done by general relativity (GR). This means In 1923 Gordon [1] made a seminal suggestion to treat to describe the effects of acceleration of a particle on a the propagation of electromagnetic waves in a moving gravitational field by a change of the space-time met- dielectric, modifying the metric structure of the back- ric, according to Einstein’s approach. We compare this ground. He showed that the electromagnetic waves prop- effective geometry to the metric in the post-Newtonian agate as geodesics not in the background geometry ηµν approximation in order to see if it is possible to repro- but instead in the effective metric duce some results of GR. Such procedure is exactly what happens in the analog models of gravitation that deals gˆµν = ηµν + (ǫµ 1) vµ vν , (1) with systems kinematically equivalence, but dynamically − distinct. -
Obituaries Prepared by the Historical Astronomy Division
1665 Obituaries Prepared by the Historical Astronomy Division DAVID FULMER BENDER, 1913-2004 their orbital elements into computer cards and initiated a David Fulmer Bender died in San Diego, California, on long career of searching for opportunities for spacecraft to 13 September 2004, at the age of 91. His heart stopped sud- flyby or rendezvous with one of these minor planets. He denly while he was dancing. His pioneering work in estab- learned enough Russian to read books important at the time lishing comprehensive, computer-accessible ephemerides of on the subject of asteroid orbits. In 1966 he had enough data to publish a paper on some possible asteroid encounters by asteroids and comets found many applications, including the human missions to Mars. Through conferences of the Ameri- first- ever visit to an asteroid, Gaspra, by an interplanetary can Astronautical Society, Dave became acquainted with spacecraft. Roger Bourke, the group supervisor of the Advanced Dave was born in Reno, Nevada, on 10 February 1913, to Projects Group at the Jet Propulsion Laboratory ͑JPL͒, which Homer Charles Bender and Susan Bowers Bender. The fam- is managed by Caltech for NASA. In 1970, Dave retired ily moved to Spokane, Washington, while Dave was very from Whittier College and began working full time for Roger young. His father was a civil engineer and a graduate of at JPL. MIT, who helped design bridges and dams throughout the JPL was still working on missions to the inner planets and Northwest, including the Grand Coolie Dam. Dave had a was starting to develop missions to the outer planets. -
Gravity, Bose-Einstein Condensates and Analogue Models from Theory to Experiment, (Also from Kinematics to Thermo-Dynamics ?)
Gravity, Bose-Einstein Condensates and Analogue Models from Theory to Experiment, (also from Kinematics to Thermo-Dynamics ?) Serena Fagnocchi Anne McLaren Fellow School of Physics and Astronomy , Nottingham UK Gravity as Thermodynamics: towards the microscopic origin of geometry SISSA - Trieste, Sept 7 2011 Collaborators: R. Balbinot , Bologna University , Italy A. Fabbri , Valencia University , Spain S, Liberati , S.Finazzi , A. Prain , A. Trombettoni , M. Kormos , SISSA , Trieste , Italy E. Copeland’s Group , Nottingham , UK I. Carusotto , A. Recati , BEC Group , Trento , Italy I. Cirac , B. Horstamnn , Max Planck Institut fur Quantenoptik , Munich B. Reznik , Tel Aviv University, Israel E. Altman , Weizmann Institute , Israel E. Demler , Harvard University , US P. Krüger , Cold Atoms Group , Nottingham, UK Outline 1 Analog Models Introduction - Motivations Acoustic Black Holes Cold Atoms 2 Correlations Hawking Radiation Dynamical Casimir Effect 3 From Kinematics to Thermo-Dynamics Dynamics Thermodynamics (speculative) Yet no experimental observation! QFT in curved spaces Quantum Field Theory in Curved Spacetime: Semiclassical Gravity studies the quantum effects due to the propagation of quantum field in the presence of strong gravitational fields Gravity treated classically (Einstein Theory) Matter fields are quantized Important and amazing results: Hawking Radiation Cosmological particle production Super-radiance Moving Mirror particle production .... QFT in curved spaces Quantum Field Theory in Curved Spacetime: Semiclassical Gravity studies the quantum effects due to the propagation of quantum field in the presence of strong gravitational fields Gravity treated classically (Einstein Theory) Matter fields are quantized Important and amazing results: Hawking Radiation Cosmological particle production Super-radiance Moving Mirror particle production .... Yet no experimental observation! Analog Models of Gravity in Hydrodynamics . -
![Superradiance Arxiv:1501.06570V3 [Gr-Qc] 4 Sep 2015](https://docslib.b-cdn.net/cover/0431/superradiance-arxiv-1501-06570v3-gr-qc-4-sep-2015-5250431.webp)
Superradiance Arxiv:1501.06570V3 [Gr-Qc] 4 Sep 2015
September 7, 2015 Superradiance Richard Brito,1 Vitor Cardoso,1;2;3 Paolo Pani,4;1 1 CENTRA, Departamento de F´ısica, Instituto Superior T´ecnico, Universidade de Lisboa, Av. Rovisco Pais 1, 1049 Lisboa, Portugal. 2 Perimeter Institute for Theoretical Physics, Waterloo, Ontario N2J 2W9, Canada. 3 Department of Physics and Astronomy, The University of Mississippi, University, MS 38677, USA. 4 Dipartimento di Fisica, \Sapienza" Universit`adi Roma & Sezione INFN Roma1, P.A. Moro 5, 00185, Roma, Italy [email protected], [email protected], [email protected] Abstract Superradiance is a radiation enhancement process that involves dissipative systems. With a 60 year-old history, superradiance has played a prominent role in optics, quantum mechanics and especially in relativity and astrophysics. In General Relativity, black-hole superradiance is permitted by dissipation at the event horizon, that allows for energy, charge and angular momentum extraction from the vacuum, even at the classical level. Black-hole superradiance is intimately connected to the black-hole area theorem, Penrose process, tidal forces and even Hawking radiation, which can be interpreted as a quantum version of black-hole super- radiance. Various mechanisms (as diverse as massive fields, magnetic fields, anti-de Sitter boundaries, nonlinear interactions, etc...) can confine the amplified radiation and give rise to strong instabilities. These \black-hole bombs" have applications in searches of dark matter arXiv:1501.06570v3 [gr-qc] 4 Sep 2015 and of physics beyond the Standard Model, are associated to the threshold of formation of new black hole solutions that evade the no-hair theorems, can be studied in the laboratory by devising analog models of gravity, and might even provide a holographic description of spontaneous symmetry breaking and superfluidity through the gauge-gravity duality.