Twistor Theory 1St Edition Free Download

Total Page:16

File Type:pdf, Size:1020Kb

Twistor Theory 1St Edition Free Download FREE TWISTOR THEORY 1ST EDITION PDF Stephen Huggett | 9781351406550 | | | | | String Theory and Twistor Theory - dummies This book is an introduction to twistor theory and modern geometrical approaches to space-time structure at the graduate or advanced undergraduate level. The choice of material presented has evolved from graduate lectures given in London and Oxford and the authors have aimed to retain the informal tone of those lectures. The book will provide graduate students with an introduction to the literature of twistor theory, presupposing some knowledge of special relativity and differential geometry. It would also be of use for a short course on space-time structure independently of twistor theory. The physicist could be introduced gently to some of the mathematics Twistor Theory 1st edition has proved useful in these areas, and the mathematician could be shown where sheaf cohomology and complex manifold theory can be used in physics. Previous page. Roger Penrose. Robert J. Jakob Schwichtenberg. Physics from Finance: A gentle introduction to gauge theories, fundamental interactions and fiber bundles. Next page. Burstall, Contemporary Physics. I believe that spinors and twistors are very important and that they reveal clearly profound structure that is not easily noticed using other formalisms. There can be no doubt that Sir Roger Penrose has been the leading exponent of this line of thinking for a long, long time. His book, Spinors and Spacetime is indispensable and a great classic, but it isn't Twistor Theory 1st edition the easiest book to read. In particular, I've spent a lot of time sorting through Twistor Theory 1st edition first chapter, trying to see clearly just what a Twistor Theory 1st edition "really is. It is, undeniably, terse, but that is actually helpful. It takes the shortest path in showing just what a spinor really is and how to work with it. A new reader might take half an hour or an hour to figure out the notes that go with a page of the writing, but it is clear, it conveys proper understanding, and gets to the point as efficiently as possible. In contrast, the first chapter of Spinors and Spacetime is very illuminating, but reads something like Twistor Theory 1st edition calculational notes. I find more insight from it after reading Huggett than before. I am convinced that this formalism is of such importance that it will come, in the fullness of time, to be a dominant language of mathematical physics. To many, it seems a bit abstract and unattractive. To me, it is the "right" language, and I need to speak it well, whether I start out finding it convenient or not. Huggett and Tod Twistor Theory 1st edition done a great service. I don't know any other book that Twistor Theory 1st edition very helpful to get a start in these matters. This one is helpful. Brilliant little book written for Advanced Undergrads and Graduate Students. Tod is one of Roger Penrose's proteges in Twistor Theory. Of course the book assumes some knowledge of intro Differential Geometry and Special Relativity. Twistor Diagrams In theoretical physicstwistor theory was proposed by Roger Penrose in [1] as a possible path [2] to quantum gravity and has evolved into a branch of theoretical and mathematical physics. Penrose proposed that twistor space should be the basic arena for physics from which space-time itself should emerge. It leads to a powerful set of mathematical tools that have applications to differential and integral Twistor Theory 1st editionnonlinear differential equations and representation theory and in physics Twistor Theory 1st edition general relativity and quantum field theoryin particular to scattering amplitudes. It has the physical interpretation of the space of massless particles with spin. This definition can be extended to arbitrary dimensions except that beyond dimension four, one defines projective twistor space to be the space of projective pure spinors for the conformal group. In its original form, twistor theory encodes physical fields on Minkowski space into complex analytic objects on twistor space via the Penrose transform. This is especially natural for massless fields of arbitrary spin. In the first instance these are obtained via contour integral formulae in terms of free holomorphic functions on regions in twistor space. These constructions have had wide applications. The self-duality condition is a major limitation for incorporating the full nonlinearities of physical theories, although it does suffice for Yang—Mills—Higgs monopoles and instantons see Twistor Theory 1st edition construction. These apply to general fields but the field equations Twistor Theory 1st edition no longer so simply expressed. Twistorial formulae for interactions beyond the self-dual sector Twistor Theory 1st edition arose from Witten's twistor string theory. Despite its shortcomings, twistor string theory led to rapid developments in the study of scattering amplitudes. One was the so-called MHV formalism [16] loosely based on disconnected strings, but was given a more basic foundation in terms of a twistor action for full Yang—Mills theory in twistor space. Twistor string theory was extended first by generalising the RSV Yang—Mills amplitude formula, and then by finding the underlying string theory. They extend to give formulae for loop amplitudes [33] [34] and can be defined on curved backgrounds. Points in Twistor Theory 1st edition space are related to subspaces of twistor space through the incidence relation. Supertwistors are a supersymmetric extension of twistors introduced by Alan Ferber in The nonlinear graviton construction encodes only anti-self-dual, i. The task of using such twistor functions in a fully nonlinear way so as to obtain a right-handed Twistor Theory 1st edition graviton has been referred to as the gravitational googly problem the word " googly " is a term used Twistor Theory 1st edition the game of cricket for a ball bowled with right-handed helicity using the apparent action that would normally give rise to left-handed helicity. From Wikipedia, the free encyclopedia. Redirected from Penrose Twistor Theory. Journal of Mathematical Physics. Bibcode : JMP Physics Reports. Bibcode : PhR Spinors and Space-Time. Cambridge University Press. Classical and Quantum Gravity. Bibcode : CQGra Physics Letters A. Bibcode : PhLA Richard Samuel Twistor geometry and field theory. Wells, R. Raymond O'Neil Cambridge [England]: Cambridge University Press. Integrability, self-duality, and twistor theory. Oxford: Clarendon Press. Solitons, instantons, and twistors. Oxford: Oxford University Press. Physics Letters B. Bibcode : PhLB Communications in Mathematical Physics. Bibcode : CMaPh. Physical Review D. Bibcode : PhRvD. Journal of High Energy Physics. Bibcode : JHEP Journal of Physics A: Mathematical and Theoretical. Bibcode : JPhA Physical Review Letters. Bibcode : PhRvL. Bibcode : PhRvL. A : Theories of gravitation. Newton's law of universal gravitation Gauss's law for gravity Poisson's equation for gravity History of gravitational theory. Classical theories of gravitation Quantum gravity Theory of everything. Kaluza—Klein theory Dilaton Supergravity. Quantum gravity. Bunch—Davies vacuum Hawking radiation Semiclassical gravity Unruh effect. Bosonic string theory M-theory Supergravity Superstring theory. Loop quantum gravity Wheeler—DeWitt equation. Hartle—Hawking state. Causal dynamical triangulation Causal sets Noncommutative geometry Spin foam Group field theory Superfluid vacuum theory Twistor theory Dual graviton. See also: Template:Quantum mechanics topics. Roger Penrose. Aldiss Topics of twistor theory. Background independence. Quantum gravity Theory of everything. Penrose transform Twistor space. Twistor string theory Twistor correspondence Twistor Twistor Theory 1st edition. Standard Model. String theory Loop quantum gravity Causal dynamical triangulation Canonical quantum gravity Superfluid vacuum theory Twistor theory. Categories : Clifford algebras Quantum field theory Theories of gravitation. Hidden categories: CS1 maint: numeric Twistor Theory 1st edition authors list. Namespaces Article Talk. Views Read Edit View history. Help Learn to edit Community portal Recent changes Upload file. Download as PDF Printable version. Newtonian gravity NG Newton's law Twistor Theory 1st edition universal gravitation Gauss's law for gravity Poisson's equation for gravity History of gravitational theory. Paradigms Classical theories of gravitation Quantum gravity Theory of everything. String theory Bosonic string theory M-theory Supergravity Superstring theory. Principles Background independence. Twistors Penrose transform Twistor space. "Twistor" Theory Reignites the Latest Superstring Revolution - Scientific American In the late s the renowned University of Oxford physicist and mathematician Roger Penrose came up with a radically new way to develop a unified theory of physics. Instead of seeking to explain how particles move and interact within space and time, he proposed that space and time themselves are secondary constructs that emerge out of a deeper level of reality. But his so-called twistor theory never caught on, and conceptual problems stymied its few proponents. Like so many other attempts to unify physics, twistors were left for dead. Expecting Witten to chastise him for having criticized string theory as a fad, Penrose was surprised to find that Witten wanted to talk about his forgotten brainchild. A few months later Witten posted a dense page paper that tied Twistor Theory 1st edition twistors
Recommended publications
  • Atiyah, M.F. 1. Geometry of Yang-Mills Fields, Lezioni Fermiani, Pisa 1979 2
    BIBLIOGRAPHY Atiyah, M.F. 1. Geometry of Yang-Mills fields, Lezioni Fermiani, Pisa 1979 2. Green's functions for seH-dual four manifolds, Adv. in Math. 7 A (1981) 130-158 Atiyah, M. F., Drin'feld, V.G., Hitchin, N. J. 3. Construction of instantons, Phys. Lett. 65A (1978) 185-187 Atiyah, MF., Hitchin, N.J., Singer, I.M. 4. SeH-duality in four-dimensional Riemannian geometry, Proc. Roy. Soc. Lon­ don 362 (1978), 425-461 Atiyah, M. F., Jones, J. S. 5. Topological aspects of Yang-Mills theory, Comm. Math. Phys. 61 (1978), 97-118 Atiyah, M.F., Ward, R.S. 6. Instantons and algebraic geometry, Comm. Math. Phys. 55 (1977), 117-124 Barth, W. 7. Moduli of vector bundles on the projective plane, Invent. Math 42 (1977), 63-91 Barth, W., Hulek, K. 8. Monads 8.lJ.d moduli of vector bundles, manuscripta math. 25 (1978),323- 347 Beilinson, A. A. 9. Coherent sheaves on pn and problems in linear algebra, Funct. Anal. Appl. 12 (1978), 214-216 Beilinson, A. A., Gel'fand, S. I, Manin, Yu. I. 10. An instanton is determined by its complex singularlties, Funct. Anal. Appl. 14 (1980), 118-119 Belavin, A. A., Polyakov, A. M., Schwartz, A. S., Tyupkin, Yu. 11. Pseudo-particle solutions of the Yang-Mills equations, Phys. Lett. 59B (1975), 85-87 288 Bibliography Belavin, A. A., Zakharov, V. E. 12. Multidimensional method of the inverse scattering problem and duality equations for the Yang-Mills field, JETP Letters 25 (1977), 567-570 Berezin, F. A. 13. The mathematical basis of supersymmetrie field theories, Sov.
    [Show full text]
  • Twistor Theory and Differential Equations
    IOP PUBLISHING JOURNAL OF PHYSICS A: MATHEMATICAL AND THEORETICAL J. Phys. A: Math. Theor. 42 (2009) 404004 (19pp) doi:10.1088/1751-8113/42/40/404004 Twistor theory and differential equations Maciej Dunajski Department of Applied Mathematics and Theoretical Physics, University of Cambridge, Wilberforce Road, Cambridge CB3 0WA, UK E-mail: [email protected] Received 31 January 2009, in final form 17 March 2009 Published 16 September 2009 Online at stacks.iop.org/JPhysA/42/404004 Abstract This is an elementary and self-contained review of twistor theory as a geometric tool for solving nonlinear differential equations. Solutions to soliton equations such as KdV,Tzitzeica, integrable chiral model, BPS monopole or Sine–Gordon arise from holomorphic vector bundles over T CP1. A different framework is provided for the dispersionless analogues of soliton equations, such as dispersionless KP or SU(∞) Toda system in 2+1 dimensions. Their solutions correspond to deformations of (parts of) T CP1, and ultimately to Einstein– Weyl curved geometries generalizing the flat Minkowski space. A number of exercises are included and the necessary facts about vector bundles over the Riemann sphere are summarized in the appendix. PACS number: 02.30.Ik (Some figures in this article are in colour only in the electronic version) 1. Introduction Twistor theory was created by Penrose [19] in 1967. The original motivation was to unify general relativity and quantum mechanics in a non-local theory based on complex numbers. The application of twistor theory to differential equations and integrability has been an unexpected spin off from the twistor programme.
    [Show full text]
  • JHEP10(2020)127 Springer July 4, 2020 : October 20, 2020 : September 22, 2020 : Boundary Action
    Published for SISSA by Springer Received: July 4, 2020 Accepted: September 22, 2020 Published: October 20, 2020 Higher-spin symmetry vs. boundary locality, and a JHEP10(2020)127 rehabilitation of dS/CFT Adrian David and Yasha Neiman Okinawa Institute of Science and Technology, 1919-1 Tancha, Onna-son, Okinawa 904-0495, Japan E-mail: [email protected], [email protected] Abstract: We consider the holographic duality between 4d type-A higher-spin gravity and a 3d free vector model. It is known that the Feynman diagrams for boundary correlators can be encapsulated in an HS-algebraic twistorial expression. This expression can be evaluated not just on separate boundary insertions, but on entire finite source distributions. We do so for the first time, and find that the result ZHS disagrees with the usual CFT partition function. While such disagreement was expected due to contact corrections, it persists even in their absence. We ascribe it to a confusion between on-shell and off-shell boundary calculations. In Lorentzian boundary signature, this manifests via wrong relative signs for Feynman diagrams with different permutations of the source points. In Euclidean, the signs are instead ambiguous, spoiling would-be linear superpositions. Framing the situation as a conflict between boundary locality and HS symmetry, we sacrifice locality and choose to take ZHS seriously. We are rewarded by the dissolution of a long-standing pathology in higher-spin dS/CFT. Though we lose the connection to the local CFT, the precise form of ZHS can be recovered from first principles, by demanding a spin-local boundary action.
    [Show full text]
  • Spacetime Structuralism
    Philosophy and Foundations of Physics 37 The Ontology of Spacetime D. Dieks (Editor) r 2006 Elsevier B.V. All rights reserved DOI 10.1016/S1871-1774(06)01003-5 Chapter 3 Spacetime Structuralism Jonathan Bain Humanities and Social Sciences, Polytechnic University, Brooklyn, NY 11201, USA Abstract In this essay, I consider the ontological status of spacetime from the points of view of the standard tensor formalism and three alternatives: twistor theory, Einstein algebras, and geometric algebra. I briefly review how classical field theories can be formulated in each of these formalisms, and indicate how this suggests a structural realist interpre- tation of spacetime. 1. Introduction This essay is concerned with the following question: If it is possible to do classical field theory without a 4-dimensional differentiable manifold, what does this suggest about the ontological status of spacetime from the point of view of a semantic realist? In Section 2, I indicate why a semantic realist would want to do classical field theory without a manifold. In Sections 3–5, I indicate the extent to which such a feat is possible. Finally, in Section 6, I indicate the type of spacetime realism this feat suggests. 2. Manifolds and manifold substantivalism In classical field theories presented in the standard tensor formalism, spacetime is represented by a differentiable manifold M and physical fields are represented by tensor fields that quantify over the points of M. To some authors, this has 38 J. Bain suggested an ontological commitment to spacetime points (e.g., Field, 1989; Earman, 1989). This inclination might be seen as being motivated by a general semantic realist desire to take successful theories at their face value, a desire for a literal interpretation of the claims such theories make (Earman, 1993; Horwich, 1982).
    [Show full text]
  • The Penrose Transform for Einstein-Weyl and Related Spaces
    The Penrose Transform for Einstein-Weyl and Related Spaces Cheng-chih Tsai PhD Edinburgh University 1996 r Abstract A holomorphic Penrose transform is described for Hitchin's correspondence between complex Einstein-Weyl spaces and "minitwistor" spaces, leading to isomorphisms between the sheaf cohomologies of holomorphic line bundles on a minitwistor space and the solution spaces of some conformally invariant field equations on the corresponding Einstein-Weyl space. The Penrose transforms for complex Euclidean 3-space and complex hyperbolic 3-space, two examples which have preferred Riemannian metrics, are explicitly discussed before the treatment of the general case. The non-holomorphic Penrose transform of Bailey, Eastwood and Singer, which translates holomorphic data on a complex manifold to data on a smooth mani- fold, using the notion of involutive cohomology, is reviewed and applied to the non-holomorphic twistor correspondences of four homogeneous spaces: Euclidean 3-space, hyperbolic 3-space, Euclidean 5-space (considered as the space of trace- free symmetric 3 x 3 matrices) and the space of non-degenerate real conics in complex projective plane. The complexified holomorphic twistor correspondences of the last two cases turn out to be examples of a more general correspondence between complex surfaces with rational curves of self-intersection number 4 and their moduli spaces. Declaration I hereby declare that the thesis is composed by me and is my own work. 111 Acknowledgments I would like to thank my supervisor Dr. T. N. Bailey for his guidance, encourage- ment and comments throughout the period of my study at Edinburgh University. Thanks are also due to the Department of Mathematics and Statistics for provid- ing such a nice environment in which to work, and to the ORS Awards Scheme for partial financial support.
    [Show full text]
  • From Spinor Geometry to Complex General Relativity 3
    February 1, 2008 20:37 WSPC/INSTRUCTION FILE esposito International Journal of Geometric Methods in Modern Physics c World Scientific Publishing Company FROM SPINOR GEOMETRY TO COMPLEX GENERAL RELATIVITY∗ GIAMPIERO ESPOSITO INFN, Sezione di Napoli, and Dipartimento di Scienze Fisiche, Universit`aFederico II, Complesso Universitario di Monte S. Angelo, Via Cintia, Edificio N’ 80126 Napoli, Italy [email protected] Received (1 April 2005) An attempt is made of giving a self-contained introduction to holomorphic ideas in gen- eral relativity, following work over the last thirty years by several authors. The main top- ics are complex manifolds, two-component spinor calculus, conformal gravity, α-planes in Minkowski space-time, α-surfaces and twistor geometry, anti-self-dual space-times and Penrose transform, spin-3/2 potentials, heaven spaces and heavenly equations. Keywords: Two-component spinors; twistors; Penrose transform. 1. Introduction to Complex Space-Time The physical and mathematical motivations for studying complex space-times or arXiv:hep-th/0504089v2 23 May 2005 real Riemannian four-manifolds in gravitational physics are first described. They originate from algebraic geometry, Euclidean quantum field theory, the path- integral approach to quantum gravity, and the theory of conformal gravity. The theory of complex manifolds is then briefly outlined. Here, one deals with para- compact Hausdorff spaces where local coordinates transform by complex-analytic transformations. Examples are given such as complex projective space Pm, non- singular sub-manifolds of Pm, and orientable surfaces. The plan of the whole paper is eventually presented, with emphasis on two-component spinor calculus, Penrose 3 transform and Penrose formalism for spin- 2 potentials.
    [Show full text]
  • Algebraic Geometry in Cosmology?
    Symmetry, Integrability and Geometry: Methods and Applications SIGMA 10 (2014), 073, 20 pages Big Bang, Blowup, and Modular Curves: Algebraic Geometry in Cosmology? Yuri I. MANIN y and Matilde MARCOLLI z y Max-Planck-Institut f¨urMathematik, Bonn, Germany E-mail: [email protected] z California Institute of Technology, Pasadena, USA E-mail: [email protected] Received March 01, 2014, in final form June 27, 2014; Published online July 09, 2014 http://dx.doi.org/10.3842/SIGMA.2014.073 Abstract. We introduce some algebraic geometric models in cosmology related to the \boundaries" of space-time: Big Bang, Mixmaster Universe, Penrose's crossovers between aeons. We suggest to model the kinematics of Big Bang using the algebraic geometric (or analytic) blow up of a point x. This creates a boundary which consists of the projective space of tangent directions to x and possibly of the light cone of x. We argue that time on the boundary undergoes the Wick rotation and becomes purely imaginary. The Mixmaster (Bianchi IX) model of the early history of the universe is neatly explained in this picture by postulating that the reverse Wick rotation follows a hyperbolic geodesic connecting imag- inary time axis to the real one. Penrose's idea to see the Big Bang as a sign of crossover from \the end of previous aeon" of the expanding and cooling Universe to the \beginning of the next aeon" is interpreted as an identification of a natural boundary of Minkowski space at infinity with the Big Bang boundary. Key words: Big Bang cosmology; algebro-geometric blow-ups; cyclic cosmology; Mixmaster cosmologies; modular curves 2010 Mathematics Subject Classification: 85A40; 14N05; 14G35 1 Introduction 1.1 Future and past boundaries of space-times The current observable domain of our expanding Universe is almost flat.
    [Show full text]
  • Twistor Theory at Fifty: from Contour Integrals to Twistor Strings
    Twistor theory at fifty: from contour integrals to twistor strings Michael Atiyah∗ School of Mathematics, University of Edinburgh, Kings Buildings, Edinburgh EH9 3JZ, UK. and Trinity College, Cambridge, CB2 1TQ, UK. Maciej Dunajski† Department of Applied Mathematics and Theoretical Physics, University of Cambridge, Wilberforce Road, Cambridge CB3 0WA, UK. Lionel J Mason‡ The Mathematical Institute, Andrew Wiles Building, University of Oxford, ROQ Woodstock Rd, OX2 6GG September 6, 2017 Dedicated to Roger Penrose and Nick Woodhouse at 85 and 67 years. Abstract We review aspects of twistor theory, its aims and achievements spanning the last five decades. In the twistor approach, space–time is secondary with events being derived objects that correspond to com- arXiv:1704.07464v2 [hep-th] 8 Sep 2017 pact holomorphic curves in a complex three–fold – the twistor space. After giving an elementary construction of this space we demonstrate how solutions to linear and nonlinear equations of mathematical physics: anti-self-duality (ASD) equations on Yang–Mills, or conformal curva- ture can be encoded into twistor cohomology. These twistor corre- spondences yield explicit examples of Yang–Mills, and gravitational instantons which we review. They also underlie the twistor approach to integrability: the solitonic systems arise as symmetry reductions of ∗[email protected][email protected][email protected] 1 ASD Yang–Mills equations, and Einstein–Weyl dispersionless systems are reductions of ASD conformal equations. We then review the holomorphic string theories in twistor and am- bitwistor spaces, and explain how these theories give rise to remarkable new formulae for the computation of quantum scattering amplitudes.
    [Show full text]
  • Big Bang, Blowup, and Modular Curves: Algebraic Geometry in Cosmology?
    Symmetry, Integrability and Geometry: Methods and Applications SIGMA 10 (2014), 073, 20 pages Big Bang, Blowup, and Modular Curves: Algebraic Geometry in Cosmology? Yuri I. MANIN y and Matilde MARCOLLI z y Max-Planck-Institut f¨urMathematik, Bonn, Germany E-mail: [email protected] z California Institute of Technology, Pasadena, USA E-mail: [email protected] Received March 01, 2014, in final form June 27, 2014; Published online July 09, 2014 http://dx.doi.org/10.3842/SIGMA.2014.073 Abstract. We introduce some algebraic geometric models in cosmology related to the \boundaries" of space-time: Big Bang, Mixmaster Universe, Penrose's crossovers between aeons. We suggest to model the kinematics of Big Bang using the algebraic geometric (or analytic) blow up of a point x. This creates a boundary which consists of the projective space of tangent directions to x and possibly of the light cone of x. We argue that time on the boundary undergoes the Wick rotation and becomes purely imaginary. The Mixmaster (Bianchi IX) model of the early history of the universe is neatly explained in this picture by postulating that the reverse Wick rotation follows a hyperbolic geodesic connecting imag- inary time axis to the real one. Penrose's idea to see the Big Bang as a sign of crossover from \the end of previous aeon" of the expanding and cooling Universe to the \beginning of the next aeon" is interpreted as an identification of a natural boundary of Minkowski space at infinity with the Big Bang boundary. Key words: Big Bang cosmology; algebro-geometric blow-ups; cyclic cosmology; Mixmaster cosmologies; modular curves 2010 Mathematics Subject Classification: 85A40; 14N05; 14G35 1 Introduction 1.1 Future and past boundaries of space-times The current observable domain of our expanding Universe is almost flat.
    [Show full text]
  • The Penrose Transform in Split Signature ✩
    View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by Elsevier - Publisher Connector Differential Geometry and its Applications 30 (2012) 334–346 Contents lists available at SciVerse ScienceDirect Differential Geometry and its Applications www.elsevier.com/locate/difgeo The Penrose transform in split signature ✩ Masood Aryapoor Institute for Research in Fundamental Sciences (IPM), P.O. Box 19395-5746, Tehran, Iran article info abstract Article history: A version of the Penrose transform is introduced in split signature. It relates cohomological Received 16 June 2010 data on CP3 \ RP3 and the kernel of differential operators on M, the (real) Grassmannian Received in revised form 7 December 2011 of 2-planes in R4. As an example we derive the following cohomological interpretation of Available online 10 May 2012 the so-called X-ray transform Communicated by M.G. Eastwood ∼ 1 CP3 \ RP3 O − →= : ω [− ] → ω [− ] MSC: Hc , ( 2) ker 2,2 Γ M, ε 1 Γ M, ε 3 53C65 where Γ ω(M, ε[−1]) and Γ ω(M, ε[−3]) are real analytic sections of certain (homoge- Keywords: neous) line bundles on M, c stands for cohomology with compact support and 2,2 is Penrose transform the ultrahyperbolic operator. Furthermore, this gives a cohomological realization of the so- Split signature called “minimal” representation of SL(4, R).WealsopresentthesplitPenrosetransformin split instanton backgrounds. © 2012 Elsevier B.V. All rights reserved. 1. Introduction The Penrose transform is a well-known transform which relates the cohomological data on P, the complex 3-projective space, and the spaces of solutions of certain differential operators on M, the Grassmannian of complex 2-planes in C4,i.e.
    [Show full text]
  • Real Forms of the Radon-Penrose Transform
    Real forms of the Radon-Penrose transform Andrea D’Agnolo∗ Corrado Marastoni∗∗ Abstract The complex Radon correspondence relates an n-dimensional projective space with the Grassmann manifold of its p-dimensional planes. This is the geometric background of the Radon-Penrose transform, which intertwines co- homology classes of homogeneous line bundles with holomorphic solutions to the generalized massless field equations. A good framework to deal with such problems is provided by the recently developed theory of integral transforms for sheaves and D-modules. In particular, an adjunction formula describes the range of transforms acting on general function spaces, associated with constructible sheaves. The linear group SL(n+1, C) naturally acts on the Radon correspondence. A distinguished family of function spaces is then the one associated with locally constant sheaves along the closed orbits of the real forms of SL(n + 1, C). In this paper, we systematically apply the above-mentioned adjunction formula to such function spaces. We thus obtain in a unified manner several results concerning the complex, conformal, or real Radon transforms. Contents Introduction 2 1 Classical statement of the results 5 1.1 The Radon-Penrose transform . 5 1.2 Action of SU(p + 1, n − p)........................ 7 1.3 Action of SL(n + 1, R).......................... 8 1.4 Action of SL(n + 1, C)R ......................... 10 1.5 Action of SL((n + 1)/2, H) ....................... 11 Communicated by M. Kashiwara, May 24, 1999. 2000 AMS Mathematics Subject Classification(s): 35C15, 32L25, 44A12 ∗ Institut de Math´ematiques; 175, rue du Chevaleret; 75013 Paris; France [email protected] ∗∗ Dip.
    [Show full text]
  • Twistor Formulation of Some Partial Differential Equations
    Sudan University of Science and Technology College of Graduate Studies Twistor Formulation of Some Partial Differential Equations صيغ اﻹلتوائيات لبعض المعادﻻت التفاضلية الجزئية A Thesis submitted in Fulfillment Requirements for the Degree of Ph.D in Mathematics By: Khalid Abdalla Mohammed Zein Babiker Supervisor: Prof. Mohamed Ali Bashir 2019 1 2 Dedication To the soul of my mother. To my father. To my wife, To my family. To my teachers To my colleagues To my friends And To my students I Acknowledgements I am so grateful to my supervisor Prof. Dr. Mohammed Ali Bashir for patient supervision and collaboration to achieve this thesis. I highly appreciate Prof. Dr. Bashir's sincerity and generosity and above all his friendly, humanitarian manner. I would like to express my deep gratitude to my family for the earnest support they avid me throughout my life. My gratitude extends to all my colleagues and friends for their efforts that have helped my tremendously to accomplish this thesis. II Abstract Twistor theory has been invented by R. Penrose in order to generalize gravity. He introduced a geometrical model for Minkowski space. This geometrical setup has been generalized in solving particle differential equations. In particular zero-rest-mass field equation have been treated this way as a Contour integral of complex twistor function. In our study we consider geometrical interpretations and solutions of conformal field equations. We also studied Twistors in curved space-time and related this study to the problem of quantum gravity. III 0 0 0 0 IV The Contents Subject Page Dedication Acknowledgements Abstract Abstract (Arabic) Introduction The Contents Chapter 1 1 Introduction to Twistor Theory 1.1.
    [Show full text]