Eduction

1995 ◽  
Author(s):  
E. A. Ashcroft ◽  
A. A. Faustini ◽  
R. Jaggannathan ◽  
W. W. Wadge
Keyword(s):  
Standard Model ◽  
Operational Semantics ◽  
Model Of Computation ◽  
The Standard Model ◽  
Extensional Model ◽  
The Many ◽  
Models Of Computations ◽  
Mathematical Semantics ◽  
Computing Models

We know what a Lucid program means mathematically (see Chapter 3), yet that in itself does not suggest a particular model of computation for deriving the same meaning operationally. The purpose of this chapter is to consider the various ways that Lucid programs can be evaluated and to describe in detail the most appropriate model of computation, namely, eduction. Previously, we have seen that Lucid programs can be viewed globally in geometrical terms or locally in elemental terms. Both these views are equally valid as mental devices to enable the programmer to conceive and understand Lucid programs. And each view suggests its own family of computing models—extensional models that embody the global geometrical view and intensional models that embody the local elemental view. Before we compare these two approaches to evaluating Lucid programs, it is worth relating the operational semantics given by a model of computation to the mathematical semantics. Since Lucid is purely declarative, the correct meaning of a Lucid program is that which is given mathematically. This is done without appealing to any operational notions [8]. Thus, the mathematical semantics of a Lucid program has primacy over the many operational semantics that can be given to the Lucid program using different models of computations. Consequently, the correctness of a model of computation is determined by its ability to operationally give semantics to Lucid programs that coincide with their mathematical semantics. Let us consider an extensional model of computation called reduction [37]. It is the standard model for evaluating declarative programs, and more specifically, functional programs. In reduction, programs are considered to be expressions, and a program is evaluated by repeatedly transforming, or reducing, the expression into a possibly simpler expression. The original expression must include any data that the program is to work on, so that at every stage we are manipulating both program and data, and the two become intimately entwined. The process stops when no further transformation can be applied. At each stage, several transformations may be possible, but it doesn’t matter which we apply. If we get an answer, we always get the same answer, but it is possible to make choices so that we do not arrive at the answer.

scholarly journals HISTORY OF SUPERSYMMETRIC EXTENSIONS OF THE STANDARD MODEL

2010 ◽  
Vol 25 (06) ◽  
pp. 1091-1121 ◽  
Author(s):  
M. C. RODRIGUEZ
Keyword(s):  
Standard Model ◽  
Fundamental Symmetry ◽  
The Standard Model ◽  
History Of ◽  
The Many

We recall the many obstacles which seemed, long ago, to prevent supersymmetry from possibly being a fundamental symmetry of Nature. We also present their solutions, leading to the construction of the supersymmetric extensions of the Standard Model. Finally we discuss briefly the early experimental searches for supersymmetry.

scholarly journals The many guises of a neutral fermion singlet

2017 ◽  
Vol 32 (08) ◽  
pp. 1730007 ◽  
Author(s):  
Ernest Ma
Keyword(s):  
Standard Model ◽  
Baryon Number ◽  
New Physics ◽  
Spontaneous Breaking ◽  
Particle Interactions ◽  
Neutral Fermion ◽  
The Standard Model ◽  
The Many

The addition of a neutral fermion singlet to the Standard Model (SM) of particle interactions leads to many diverse possibilities. It is not necessarily a right-handed neutrino. I discuss many of the simplest and most interesting scenarios of possible new physics with this approach. In particular, I propose the possible spontaneous breaking of baryon number, resulting in the massless “sakharon”.

scholarly journals CP violating effects in 210Fr and prospects for new physics beyond the Standard Model

2021 ◽  
Vol 2021 (2) ◽  
Author(s):  
Nanako Shitara ◽  
Nodoka Yamanaka ◽  
Bijaya Kumar Sahoo ◽  
Toshio Watanabe ◽  
Bhanu Pratap Das
Keyword(s):  
Standard Model ◽  
Higgs Sector ◽  
Higgs Doublet ◽  
New Physics ◽  
Beyond The Standard Model ◽  
Internal Electric Field ◽  
Many Body ◽  
The Standard Model ◽  
The Many ◽  
Two Higgs Doublet Model

Abstract We report theoretical results of the electric dipole moment (EDM) of 210Fr which arises from the interaction of the EDM of an electron with the internal electric field in an atom and the scalar-pseudoscalar electron-nucleus interaction; the two dominant sources of CP violation in this atom. Employing the relativistic coupled-cluster theory, we evaluate the enhancement factors for these two CP violating interactions to an accuracy of about 3% and analyze the contributions of the many-body effects. These two quantities in combination with the projected sensitivity of the 210Fr EDM experiment provide constraints on new physics beyond the Standard Model. Particularly, we demonstrate that their precise values are necessary to account for the effect of the bottom quark in models in which the Higgs sector is augmented by nonstandard Yukawa interactions such as the two-Higgs doublet model.

CP ASYMMETRIES IN B0DECAYS BEYOND THE STANDARD MODEL

1991 ◽  
Vol 06 (08) ◽  
pp. 1253-1266 ◽  
Author(s):  
CLAUDIO O. DIB ◽  
DAVID LONDON ◽  
YOSEF NIR
Keyword(s):  
Standard Model ◽  
New Physics ◽  
The Other ◽  
Beyond The Standard Model ◽  
Neutral Currents ◽  
Flavor Changing ◽  
The Standard Model ◽  
Model Predictions ◽  
The Many ◽  
Cp Asymmetries

Of the many ingredients of the Standard Model that are relevant to the analysis of CP asymmetries in B0 decays, some are likely to hold even beyond the Standard Model while others are sensitive to new physics. Consequently, certain predictions are maintained while others may show dramatic deviations from the Standard Model. Many classes of models may show clear signatures when the asymmetries are measured: four quark generations, Z-mediated flavor-changing neutral currents, supersymmetry and “real superweak” models. On the other hand, models of left-right symmetry and multi-Higgs sectors with natural flavor conservation are unlikely to modify the Standard Model predictions.

Towards a generative semantic account of aspect in Russian

1972 ◽  
Vol 8 (2) ◽  
pp. 217-236 ◽  
Author(s):  
J. Miller
Keyword(s):  
Standard Model ◽  
Noun Phrases ◽  
Generative Grammar ◽  
Surface Structures ◽  
Semantic Model ◽  
Base Component ◽  
Semantic Account ◽  
Verb Phrases ◽  
The Standard Model ◽  
The Many

Two models of generative grammar are now available, the interpretative semantic model and the generative semantic model. The latter model differs sharply from Chomsky's ‘standard model’ in that its base component generates semantic objects, namely predicates and their arguments, whereas the base component of the ‘standard model’ generates syntactic objects, e.g. noun phrases and verb phrases. The interpretative semantic model is essentially the ‘standard model’ to which have been added rules for interpreting surface structures. (For an interpretative account of pronouns and negation, see Jackendoff (1968, 1969). A criticism of Jackendoff's proposals is to be found in Lakoff (1970)). This paper offers an informal account of aspect in Russian which, it will be argued, indicates that the many problems raised by generative semantics must be tackled by any linguist interested in ‘explanatory adequacy’.

scholarly journals The Development of Superconducting Magnets for Use in Particle Accelerators: From the Tevatron to the LHC

2008 ◽  
Vol 01 (01) ◽  
pp. 185-210 ◽  
Author(s):  
Alvin Tollestrup ◽  
Ezio Todesco
Keyword(s):  
Standard Model ◽  
Superconducting Magnets ◽  
Cutting Edge ◽  
Particle Accelerators ◽  
Beyond The Standard Model ◽  
The Past ◽  
The Standard Model ◽  
The Many ◽  
Made In

Superconducting magnets have played a key role in advancing the energy reach of proton synchrotrons and enabling them to play a major role in defining the Standard Model. The problems encountered and solved at the Tevatron are described and used as an introduction to the many challenges posed by the use of this technology. The LHC is being prepared to answer the many questions beyond the Standard Model and in itself is at the cutting edge of technology. A description of its magnets and their properties is given to illustrate the advances that have been made in the use of superconducting magnets over the past 30 years.

Indirect measurements in micro-space with the EM

1995 ◽  
Vol 53 ◽  
pp. 598-599
Author(s):  
Sterling P. Newberry
Keyword(s):  
Electron Microscope ◽  
Standard Model ◽  
Particle Physics ◽  
Information Storage ◽  
Storage Space ◽  
Indirect Measurements ◽  
Storage And Retrieval ◽  
Adequate Information ◽  
Compelling Reason ◽  
The Standard Model

At the 1958 meeting of our society, then known as EMSA, the author introduced the concept of microspace and suggested its use to provide adequate information storage space and the use of electron microscope techniques to provide storage and retrieval access. At this current meeting of MSA, he wishes to suggest an additional use of the power of the electron microscope.The author has been contemplating this new use for some time and would have suggested it in the EMSA fiftieth year commemorative volume, but for page limitations. There is compelling reason to put forth this suggestion today because problems have arisen in the “Standard Model” of particle physics and funds are being greatly reduced just as we need higher energy machines to resolve these problems. Therefore, any techniques which complement or augment what we can accomplish during this austerity period with the machines at hand is worth exploring.

An Interview with the Physicist that Her Head in the Universe and Both Feet on the Earth

2019 ◽  
Author(s):  
Adib Rifqi Setiawan
Keyword(s):  
Standard Model ◽  
Particle Physics ◽  
Space Time ◽  
Additional Dimension ◽  
The Earth ◽  
The Standard Model ◽  
The Universe

Put simply, Lisa Randall’s job is to figure out how the universe works, and what it’s made of. Her contributions to theoretical particle physics include two models of space-time that bear her name. The first Randall–Sundrum model addressed a problem with the Standard Model of the universe, and the second concerned the possibility of a warped additional dimension of space. In this work, we caught up with Randall to talk about why she chose a career in physics, where she finds inspiration, and what advice she’d offer budding physicists. This article has been edited for clarity. My favourite quote in this interview is, “Figure out what you enjoy, what your talents are, and what you’re most curious to learn about.” If you insterest in her work, you can contact her on Twitter @lirarandall.

An Interview with the Physicist that Her Head in the Universe and Both Feet on the Earth

2019 ◽  
Author(s):  
Adib Rifqi Setiawan
Keyword(s):  
Standard Model ◽  
Particle Physics ◽  
Space Time ◽  
Additional Dimension ◽  
The Earth ◽  
The Standard Model ◽  
The Universe

Put simply, Lisa Randall’s job is to figure out how the universe works, and what it’s made of. Her contributions to theoretical particle physics include two models of space-time that bear her name. The first Randall–Sundrum model addressed a problem with the Standard Model of the universe, and the second concerned the possibility of a warped additional dimension of space. In this work, we caught up with Randall to talk about why she chose a career in physics, where she finds inspiration, and what advice she’d offer budding physicists. This article has been edited for clarity. My favourite quote in this interview is, “Figure out what you enjoy, what your talents are, and what you’re most curious to learn about.” If you insterest in her work, you can contact her on Twitter @lirarandall.

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