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Relevant bibliographies by topics / String tree amplitude theory

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Academic literature on the topic 'String tree amplitude theory'

Author: Grafiati

Published: 4 June 2021

Last updated: 16 February 2022

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Journal articles on the topic "String tree amplitude theory"

1

MARUI, MIHO, ICHIRO ODA, and AKIO SUGAMOTO. "A NOTE ON STRING AMPLITUDES AT HIGH ENERGY LIMIT." Modern Physics Letters A 04, no. 22 (1989): 2177–83. http://dx.doi.org/10.1142/s0217732389002446.

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LI, MIAO. "SOME REMARKS ON TACHYON ACTION IN 2D STRING THEORY." Modern Physics Letters A 08, no. 26 (1993): 2481–89. http://dx.doi.org/10.1142/s0217732393002804.

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We discuss the effective action of tachyon in the two-dimensional string theory at tree level. We show that even starting from the cubic terms the action is nonlocal and the usually assumed simplest cubic term does not give the correct amplitude. Four-point 1PI terms are also discussed.

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SATHIAPALAN, B. "LOOP VARIABLES AND GAUGE INVARIANCE IN CLOSED BOSONIC STRING THEORY." Modern Physics Letters A 19, no. 38 (2004): 2857–70. http://dx.doi.org/10.1142/s0217732304015713.

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We extend an earlier proposal for a gauge-invariant description of off-shell open strings (at tree level), using loop variables, to off-shell closed strings (at tree level). The basic idea is to describe the closed string amplitudes as a product of two open string amplitudes (using the technique of Kawai, Lewellen and Tye). The loop variable techniques that were used earlier for open strings can be applied here mutatis mutandis. It is a proposal for a theory whose on-shell amplitudes coincide with those of the closed bosonic string in 26 dimensions. It is also gauge-invariant off-shell. As was

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Dolan, Louise, and Peter Goddard. "Gluon tree amplitudes in open twistor string theory." Journal of High Energy Physics 2009, no. 12 (2009): 032. http://dx.doi.org/10.1088/1126-6708/2009/12/032.

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NATSUUME, MAKOTO. "ZERO MODE DIVERGENCE PROBLEM IN STRING THEORY." Modern Physics Letters A 09, no. 23 (1994): 2113–22. http://dx.doi.org/10.1142/s0217732394001970.

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For 2D string theory, the perturbative S-matrices are not well-defined due to a zero mode divergence. Although there exist formal procedures to make the integral convergent, their physical meanings are not clear. We describe a method to obtain finite S-matrices physically to justify the formal schemes. The scheme uses asymptotic states by wave packets which fall faster than exponentials. It is shown that the scheme gives well-defined S-matrices and justifies the formal shifted Virasoro-Shapiro amplitude for simple processes. The tree-level unitarity for these processes is also shown. We point

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Dolan, Louise, and Peter Goddard. "Tree and loop amplitudes in open twistor string theory." Journal of High Energy Physics 2007, no. 06 (2007): 005. http://dx.doi.org/10.1088/1126-6708/2007/06/005.

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Dolan, Louise, and Jay N. Ihry. "Conformal supergravity tree amplitudes from open twistor string theory." Nuclear Physics B 819, no. 3 (2009): 375–99. http://dx.doi.org/10.1016/j.nuclphysb.2009.04.003.

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HADASZ, LESZEK, and ZBIGNIEW JASKÓLSKI. "NONCRITICAL STRING LIOUVILLE THEORY AND GEOMETRIC BOOTSTRAP HYPOTHESIS." International Journal of Modern Physics A 19, no. 13 (2004): 2079–93. http://dx.doi.org/10.1142/s0217751x04018427.

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The applications of the existing Liouville theories for the description of the longitudinal dynamics of noncritical Nambu–Goto string are analyzed. We show that the recently developed DOZZ solution to the Liouville theory leads to the cut singularities in tree string amplitudes. We propose a new version of the Polyakov geometric approach to Liouville theory and formulate its basic consistency condition — the geometric bootstrap equation. Also in this approach the tree amplitudes develop cut singularities.

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SATHIAPALAN, B. "HOLOMORPHIC FACTORIZATION AND RENORMALIZATION GROUP IN CLOSED STRING THEORY." Modern Physics Letters A 20, no. 15 (2005): 1161–76. http://dx.doi.org/10.1142/s0217732305017226.

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The prescription of Kawai, Lewellen and Tye for writing closed string tree amplitudes as sums of products of open string tree amplitudes, is applied to the worldsheet renormalization group equation. The main point is that regularization of the Minkowski (rather than Euclidean) worldsheet theory allows factorization into left-moving and right-moving sectors to be maintained. Explicit calculations are done for the tachyon and the (gauge fixed) graviton.

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UKEGAWA, AKINOBU. "OFF-SHELL TREE AMPLITUDES IN HIKKO’S CLOSED STRING FIELD THEORY." International Journal of Modern Physics A 07, no. 20 (1992): 5019–26. http://dx.doi.org/10.1142/s0217751x92002283.

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Dissertations / Theses on the topic "String tree amplitude theory"

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Mavromatos, N. E. "Aspects of the low energy limit of string theories." Thesis, University of Oxford, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.379937.

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Paton, John. "Tree-Level N-Point Amplitudes in String Theory." Thesis, Uppsala universitet, Teoretisk fysik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-296369.

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This thesis reviews the method of Mafra, Schlotterer, and Stieberger (2011) for computing the full colour ordered N-point open superstring amplitude using the Pure Spinor formalism. We introduce relevant elements of super Yang-Mills theory and examine the basics of the Pure Spinor formalism, with a focus on tools for amplitude computation. We then define a series of objects with increasingly useful BRST transformation properties, which greatly simplify the calculations, and show how these properties can be determined using a diagrammatic method. Finally, we use the explicit four- and five-poin

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Tourkine, Piotr. "Results in perturbative quantum supergravity from string theory." Thesis, Paris 6, 2014. http://www.theses.fr/2014PA066295/document.

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Les théories de supergravité sont des extensions supersymmetriques de la relativité générale (RG) d'Einstein. Leur comportement ultraviolet (UV) est meilleur que celui de la RG car les contributions bosoniques et fermioniques se compensent dans les diagrammes en boucles. La supergravité maximale a le meilleur comportement UV, toutefois les prédictions les plus précises venant aussi bien de la théorie des champs que de la théorie des cordes indiquent que la théorie devrait elle aussi souffrir de divergences UV, à partir de 7 boucles. Cette question ouverte constitue un cadre dans lequel peut êt

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Mirza, Behrouz. "On the transition between crystalline and gravitational phases in two dimensional theories with matter fields." Thesis, University of Oxford, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.318930.

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Söderberg, Alexander. "Browsing the Web of Amplitudes." Thesis, Uppsala universitet, Teoretisk fysik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-309989.

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We begin by studying field-theory amplitude relations such as the Kleiss-Kuijf, Bern-Carrasco-Johansson, Kawai-Lewellen-Tye and the double copy construction, which are important ingredients in this thesis. Going beyond the field-theory limit we study how the gauge-sector of the heterotic string relates to type I amplitudes through the single valued projection of multiple zeta values. At low energy and for a U(1) gauge group (a single brane) the type I amplitudes are generated by the Born-Infeld action, whereas the corresponding heterotic amplitudes vanish in this limit. As a simple exercise we

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Hsu, Tai C. "Walking tree methods for biological string matching." Thesis, 2003. http://hdl.handle.net/1957/32486.

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Cavener, Jeffrey Douglas. "Visualization, implementation, and application of the Walking Tree heuristics for biological string matching." Thesis, 1997. http://hdl.handle.net/1957/33688.

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Biologists need tools to see the structural relationships encoded in biological sequences (strings). The Walking Tree heuristics calculate some of these relationships. I have designed and implemented graphic presentations which allow the biologist (user) to see these relations. This thesis contains background information on the biological sequences and some background on the Walking Tree heuristics. I demonstrate my methods by showing a visual matching of mitochondrial genomes. I also show matchings based on amino acids and on hydrophobicity. I also show how the parameters of the visualization

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Books on the topic "String tree amplitude theory"

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Cull, Paul. Walking tree heuristics for string matching and gene location. Oregon State University, Dept. of Computer Science, 1997.

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Hsu, Tai C. Fast walking tree method via recurrence reduction for biological string alignment. Oregon State University, Dept. of Computer Science, 2002.

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Cavener, Jeffrey Douglas. Visualization, implementation, and application of the Walking Tree heuristics for biological string matching. 1997.

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Book chapters on the topic "String tree amplitude theory"

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Erbin, Harold. "Amplitude Factorization and Feynman Diagrams." In String Field Theory. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-65321-7_14.

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Garrett, Steven L. "String Theory." In Understanding Acoustics. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-44787-8_3.

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Abstract The vibrating string has been employed by nearly every human culture to create musical instruments. Although the musical application has attracted the attention of mathematical and scientific analysts since the time of Pythagoras (570 BC–495 BC), we will study the string primarily because its vibrations are easy to visualize and string vibrations introduce concepts and techniques that will recur throughout our study of the vibration and the acoustics of continua. In this chapter, we will develop continuous mathematical functions of position and time that describe the shape of the entire string. The amplitude of such functions will describe the transverse displacement from equilibrium, y(x, t), at all positions along the string. The importance of boundary conditions at the ends of strings will be emphasized, and techniques to accommodate both ideal and “imperfect” boundary conditions will be introduced. Solutions that result in all parts of the string oscillating at the same frequency which satisfy the boundary conditions are called normal modes, and the calculation of those normal mode frequencies will be a focus of this chapter.

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Phong, Duong. "The one-loop graviton scattering amplitude in string theory." In CRM Proceedings and Lecture Notes. American Mathematical Society, 1997. http://dx.doi.org/10.1090/crmp/011/18.

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Engelfriet, Joost, and Sebastian Maneth. "Hierarchies of String Languages Generated by Deterministic Tree Transducers." In Developments in Language Theory. Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/3-540-46011-x_19.

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5

"Tree-level amplitudes." In String Theory. Cambridge University Press, 1998. http://dx.doi.org/10.1017/cbo9780511816079.009.

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"Treeing Property In Polypropylene Under Various Temperature and Electrical Field." In Electrical Insulation Breakdown and Its Theory, Process, and Prevention. IGI Global, 2020. http://dx.doi.org/10.4018/978-1-5225-8885-6.ch007.

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Polypropylene (PP) has no cross-linking process and environmentally friendly properties and is considered to be a replacement for cross-linked polyethylene (xlpe) for high voltage direct current (HVDC) cable insulation. High-voltage DC cable systems generate repetitive pulse voltages during operation and may encounter different temperature environmental challenges. This chapter discusses the effects of pulse amplitude and frequency on PP trees at different temperatures. A higher pulse frequency accelerates the propagation of the tree. Higher amplitudes accelerate tree growth and fractal dimensions. In addition, the effects of DC voltage, pulse voltage, and pulse frequency on the tree characteristics of PP at DC voltage and pulse combination voltage are also studied.

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Conference papers on the topic "String tree amplitude theory"

1

Nielsen, Holger Bech, and Masao Ninomiya. "An Object Model of String Field Theory and Derivation of Veneziano Amplitude." In Corfu Summer Institute 2016 "School and Workshops on Elementary Particle Physics and Gravity". Sissa Medialab, 2017. http://dx.doi.org/10.22323/1.292.0134.

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Gahan, Kevan W. F., and John P. Parmigiani. "Monotonic and Fatigue Testing of Polymer and Composite Materials Used in Heavy Duty Trucks." In ASME 2019 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/imece2019-11680.

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Abstract Improved material models for engineered polymer and composite materials including both monotonic and fatigue characteristics are necessary for creating more accurate digital simulations for heavy duty trucks. Unlike steel and other alloys that are commonly included in truck designs, these advanced polymer materials do not have pre-existing fatigue characteristic data. Additionally, there are no individual standard test procedures that can be commonly cited and followed during a research program. These materials are found in hoods, dashboards, body panels and splash shields of trucks,

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Lübbe, Bertold, Jens Aschenbruck, Oliver Pütz, and Mira Theidel. "Design and Validation of a Large Steam Turbine End-Stage Blade to Meet Current and Future Market Demands." In ASME Turbo Expo 2021: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/gt2021-59315.

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Abstract To meet today’s and future market needs, large end-stage blades are obliged to fulfill high flexibility regarding the operational range and high efficiency goals while being prepared for daily start-stop cycles. The end-stage total efficiency can be maximized by enlarging the steam turbine exhaust area and thereby reducing the exhaust losses. Therefore, a new Low Pressure (LP) backend featuring an increased freestanding 41″ steel blade has been developed and is presented here, which is optimized for maximum efficiency over a wide range of operation conditions. To allow for such a larg

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Chen, Li-Qun. "Principal Parametric Resonance of Axially Accelerating Viscoelastic Strings." In ASME 2005 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/detc2005-84435.

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The steady-state transverse responses and the stability of an axially accelerating viscoelastic string are investigated. The governing equation is derived from the Eulerian equation of motion of a continuum, which leads to the Mote model for transverse motion. The Kirchhoff model is derived from the Mote model by replacing the tension with the averaged tension over the string. The method of multiple scales is applied to the two models in the case of principal parametric resonance. Closed-form expressions of the amplitudes and the existence conditions of steady-state periodical responses are pr

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Vieira, Daniel P., Edgard B. Malta, Rafael A. Watai, et al. "MPSO Design: Part 1 — Wave Excitation Forces and Moments." In ASME 2012 31st International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/omae2012-83997.

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The MPSO is characterized by the use of hydrodynamics appendages, such as moonpool, beach and skirts, which improve the hydrodynamic behavior of the unit in waves. This type of platform may be designed for different offshore scenarios as, for example: the possibility of oil and gas storage, dry tree completion system and the use of steel catenary risers (SCR). An optimization procedure to choose the geometric dimensions of the MPSO becomes important in order to achieve the optimum hydrodynamic behavior to operate in harsh environmental conditions for each scenario. The optimization procedure m

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