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Geometric Optics 1 7.1 Overview
Contents III OPTICS ii 7 Geometric Optics 1 7.1 Overview...................................... 1 7.2 Waves in a Homogeneous Medium . 2 7.2.1 Monochromatic, Plane Waves; Dispersion Relation . ........ 2 7.2.2 WavePackets ............................... 4 7.3 Waves in an Inhomogeneous, Time-Varying Medium: The Eikonal Approxi- mationandGeometricOptics . .. .. .. 7 7.3.1 Geometric Optics for a Prototypical Wave Equation . ....... 8 7.3.2 Connection of Geometric Optics to Quantum Theory . ..... 11 7.3.3 GeometricOpticsforaGeneralWave . .. 15 7.3.4 Examples of Geometric-Optics Wave Propagation . ...... 17 7.3.5 Relation to Wave Packets; Breakdown of the Eikonal Approximation andGeometricOptics .......................... 19 7.3.6 Fermat’sPrinciple ............................ 19 7.4 ParaxialOptics .................................. 23 7.4.1 Axisymmetric, Paraxial Systems; Lenses, Mirrors, Telescope, Micro- scopeandOpticalCavity. 25 7.4.2 Converging Magnetic Lens for Charged Particle Beam . ....... 29 7.5 Catastrophe Optics — Multiple Images; Formation of Caustics and their Prop- erties........................................ 31 7.6 T2 Gravitational Lenses; Their Multiple Images and Caustics . ...... 39 7.6.1 T2 Refractive-Index Model of Gravitational Lensing . 39 7.6.2 T2 LensingbyaPointMass . .. .. 40 7.6.3 T2 LensingofaQuasarbyaGalaxy . 42 7.7 Polarization .................................... 46 7.7.1 Polarization Vector and its Geometric-Optics PropagationLaw. 47 7.7.2 T2 GeometricPhase .......................... 48 i Part III OPTICS ii Optics Version 1207.1.K.pdf, 28 October 2012 Prior to the twentieth century’s quantum mechanics and opening of the electromagnetic spectrum observationally, the study of optics was concerned solely with visible light. Reflection and refraction of light were first described by the Greeks and further studied by medieval scholastics such as Roger Bacon (thirteenth century), who explained the rain- bow and used refraction in the design of crude magnifying lenses and spectacles. -
The Eikonal Approximation and the Gravitational Dynamics of Binary Systems
Thesis submitted for the degree of Doctor of Philosophy The Eikonal Approximation and the Gravitational Dynamics of Binary Systems Arnau Robert Koemans Collado Supervisors Dr Rodolfo Russo & Prof Steven Thomas September 24, 2020 arXiv:2009.11053v1 [hep-th] 23 Sep 2020 Centre for Research in String Theory School of Physics and Astronomy Queen Mary University of London This thesis is dedicated to my family and friends, without their unconditional love and support this would not have been possible. It doesn't matter how beautiful your theory is, it doesn't matter how smart you are. If it doesn't agree with experiment, it's wrong. { Richard P. Feynman If you don't know, ask. You will be a fool for the moment, but a wise man for the rest of your life. { Seneca the Younger When you are courting a nice girl an hour seems like a second. When you sit on a red-hot cinder a second seems like an hour. That's rela- tivity. { Albert Einstein Abstract In this thesis we study the conservative gravitational dynamics of binary systems us- ing the eikonal approximation; allowing us to use scattering amplitude techniques to calculate dynamical quantities in classical gravity. This has implications for the study of binary black hole systems and their resulting gravitational waves. In the first three chapters we introduce some of the basic concepts and results that we will use in the rest of the thesis. In the first chapter an overview of the topic is discussed and the academic context is introduced. The second chapter includes a basic discussion of gravity as a quantum field theory, the post-Newtonian (PN) and post- Minkowskian (PM) expansions and the eikonal approximation. -
A Solution of the Cosmological Constant, Using Multiverse Version Of
Preprints (www.preprints.org) | NOT PEER-REVIEWED | Posted: 8 February 2021 doi:10.20944/preprints202102.0208.v1 Type of the Paper (Article.) A solution of the cosmological constant, using multiverse version of Penrose CCC cosmology, and Enhanced Quantization compared Andrew Beckwith 1 1 Physics Department, Chongqing University, College of Physics, Chongqing University Huxi Campus, No. 44 Dax- uechen Nanlu, Shapinba District, Chongqing 401331, People’s Republic of China, [email protected] Abstract: We reduplicate the Book “Dark Energy” by M. Li, X-D. Li, and Y. Wang, zero-point energy calculation with an unexpected “length’ added to the ‘width’ of a graviton wavefunction just prior to the entrance of ‘gravitons’ to a small region of space-time prior to a nonsingular start to the universe. We compare this to a solution worked out using Klauder Enhanced quantization, for the same given problem. The solution of the first Cosmological Constant problem relies upon the geometry of the multiverse generalization of CCC cosmology which is explained in this paper. The second solution, used involves Klauder enhanced quantization. We look at energy given by our methods and compare and contrast it with the negative energy of the Rosen model for a mini sub universe and estimate GW frequencies Keywords: Minimum scale factor, cosmological constant, space-time bubble, bouncing cosmolo- gies 1. Introduction We bring up this study due to the general failure of field theory methods to obtain a working solution to the Cosmological Constant problem. One of the reasons for this work is that Quintessence studies involving evolution of the Cosmological Constant over time have routinely failed in match ups with Early supernova data. -
Eikonal Approximation
Eikonal Approximation K. V. Shajesh∗ Department of Physics and Astronomy, University of Oklahoma, 440 W. Brooks St., Norman, OK - 73019, U. S. A. This is a study report on eikonal approximations which was undertaken under the guidance of Kimball Milton. This report was submitted to partially fulfill the requirements for the general examination. Contents I Introduction 1 II Scattering in quantum mechanics 3 A Formulation of the scattering problem . 3 B Identities satisfied by the scattering amplitude . 5 1 Dynamical reversibility theorem . 5 2 Optical theorem . 5 III Partial wave expansion 6 A Method of partial wave expansion . 7 B Scattering length of a potential . 8 C Inverted finite spherical well potential . 8 IV Eikonal approximation in quantum mechanics 9 A Formalism for the eikonal approximation . 9 B Validity of the eikonal approximation . 11 C Zeroth order eikonal approximation . 11 D Examples . 13 1 Inverted finite spherical well potential . 13 2 Yukawa potential . 14 V Quantum electrodynamics 15 A Schwinger's functional differential equations for quantum electrodynamics . 15 B A formal solution to Schwinger's functional differential equations . 16 C Electron-electron scattering . 18 VI Approximation to electron-electron scattering 19 A Quenched or ladder approximations . 19 µ B Eikonal approximation to G+[x; y; A ] . 19 I. INTRODUCTION The etymology of the word eikon traces it back to the word eikenai which is the transliteration of the word ικναι [1] in the Greek language meaning `to resemble' [2]. In the Greek language it evolved into the word eiko¯n which is the transliteration of the word ικoν [1] meaning `image' [2]. -
Geometric Optics for Light and Sound Waves
Contents II OPTICS ii 7GeometricOptics 1 7.1 Overview...................................... 1 7.2 Waves in a Homogeneous Medium . 2 7.2.1 Monochromatic, Plane Waves . 2 7.2.2 WavePackets ............................... 4 7.3 Waves in an Inhomogeneous, Time-Varying Medium: The Eikonal Approxi- mationandGeometricOptics .......................... 7 7.3.1 Geometric Optics for Light and Sound Waves . 7 7.3.2 Connection of Geometric Optics to Quantum Theory . 11 7.3.3 Geometric Optics for a General Wave . 13 7.3.4 Examples of Propagation Laws ..................... 14 7.3.5 Relation to Wave Packets; Breakdown of the Eikonal Approximation andGeometricOptics .......................... 16 7.3.6 Fermat’s Principle . 16 7.4 Paraxial Optics . 23 7.4.1 Axisymmetric, Paraxial Systems . 24 7.4.2 Converging Magnetic Lens . 26 7.5 T2 Caustics and Catastrophes—Gravitational Lenses . 30 7.5.1 T2 FormationofMultipleImages . 30 7.5.2 T2 Catastrophe Optics — Formation of Caustics . 34 7.6 Polarization . 39 7.6.1 Polarization Vector and its Geometric-Optics Propagation Law .... 39 7.6.2 T2 GeometricPhase .......................... 40 i Part II OPTICS ii Optics Version 1007.1.K.pdf, 15 Nov 2008 Prior to the opening up of the electromagnetic spectrum and the development of quantum mechanics, the study of optics was only concernedwithvisiblelight.Reflectionandrefraction were first described by the Greeks and further studied by the medieval scholastics like Roger Bacon, who explained the rainbow, and used refraction in the design of crude magnifying lenses and spectacles. However, it was not until the seventeenth century that there arose astrongcommercialinterestindevelopingthetelescopeandthecompoundmicroscope. Naturally, the discovery of Snell’s law in 1621 and the observation of diffractive phenomena stimulated serious speculation about the physical nature of light. -
Arxiv:1812.11589V1 [Gr-Qc] 30 Dec 2018
Relatively complicated? Using models to teach general relativity at different levels Markus P¨ossel Haus der Astronomie and Max Planck Institute for Astronomy Invited Talk at the session of the section Gravitation and Relativity at the Spring Meeting 2017 of the German Physical Society (DPG) Bremen, 16 March 2017 Abstract This review presents an overview of various kinds of models { physical, abstract, mathematical, visual { that can be used to present the concepts and applications of Einstein's general theory of relativity at the level of undergraduate and even high-school teaching. After a general introduction dealing with various kinds of models and their properties, specific areas of general relativity are addressed: the elastic sheet model and other models for the fundamental geometric properties of gravity, models for black holes including the river model, cosmological models for an expanding universe, and models for gravitational waves as well as for interferometric gravita- tional wave detectors. arXiv:1812.11589v1 [gr-qc] 30 Dec 2018 1 Contents 1 Introduction3 2 Models3 2.1 Models defined . .4 2.2 Narratives . .7 2.3 General and specialised models . .9 3 Models good and bad 10 4 The elastic sheet 13 4.1 What the elastic sheet model delivers . 14 4.2 Problems with the elastic sheet . 16 4.3 Non-elastic two-dimensional geometry . 19 5 Black holes 21 5.1 Newtonian calculations . 22 5.2 Astrophysics . 23 5.3 Geometry . 26 5.4 River model . 29 5.5 Visualising black holes . 31 5.6 Hawking Radiation . 33 6 Cosmology 36 6.1 Expanding substrate models .