scholarly journals F-theory on singular spaces and semi-realistic model building

2020 ◽  
Author(s):  
◽  
Jiahua Tian
Keyword(s):  
Model Building ◽  
Realistic Model ◽  
Singular Spaces

scholarly journals Marlim R3D: a realistic model for CSEM simulations - phase I: model building

2017 ◽  
Vol 47 (4) ◽  
pp. 633-644 ◽  
Author(s):  
Bruno Rodrigues Carvalho ◽  
Paulo Tarso Luiz Menezes
Keyword(s):  
Model Building ◽  
Reference Model ◽  
Sedimentary Basins ◽  
Realistic Model ◽  
Complex Model ◽  
Well Log ◽  
Recent Past ◽  
Complementary Information ◽  
Geoelectric Model ◽  
Calibration Time

ABSTRACT: The marine controlled-source electromagnetic (CSEM) method provides complementary information to seismic imaging in the exploration of sedimentary basins. The CSEM is mainly used for reservoir scanning and appraisal. The CSEM interpretation workflow is heavily based on inversion and forward - modeling for hypothesis testing. Until the recent past, the effectiveness of a given workflow was achieved after the drilling results, as there wasn’t any geological complex model available to serve as a benchmark. In the present paper, we describe the workflow to build up Marlim R3D, a realistic and complex geoelectric model. Marlim R3D aims to be a reference model of turbidite reservoirs of the Brazilian continental margin. Our model is based on seismic interpretation and constrained by the input of available well-log information. The workflow used is composed of seven steps: seismic and well-log dataset loading, well-tie, Vp cube construction, Vp resistivity calibration, time-depth conversion, resistivity cube construction, and quality-control check. As a result, we obtained an interpreted dataset composed by main stratigraphic horizons, pseudo-well logs, and the resistivity cubes. These elements were made freely available for research or commercial use, under the Creative Common License, at the Zenodo platform.

scholarly journals MEDIATION OF SUPERSYMMETRY BREAKING IN EXTRA DIMENSIONS

2005 ◽  
Vol 20 (05) ◽  
pp. 297-312 ◽  
Author(s):  
CLAUDIO A. SCRUCCA
Keyword(s):  
Supersymmetry Breaking ◽  
Effective Field Theory ◽  
Extra Dimensions ◽  
Model Building ◽  
Realistic Model ◽  
Effective Field ◽  
Theory Approach ◽  
Classical Level ◽  
Gravitational Effects ◽  
Gravitational Fields

We review the mechanisms of supersymmetry breaking mediation that occur in sequestered models, where the visible and the hidden sectors are separated by an extra dimension and communicate only via gravitational interactions. By locality, soft breaking terms are forbidden at the classical level and reliably computable within an effective field theory approach at the quantum level. We present a self-contained discussion of these radiative gravitational effects and the resulting pattern of soft masses, and give an overview of realistic model building based on this setup. We consider both flat and warped extra dimensions, as well as the possibility that there be localized kinetic terms for the gravitational fields.

scholarly journals Conceptual model building inspired by field-mapped runoff generation mechanisms

2018 ◽  
Vol 66 (3) ◽  
pp. 303-315 ◽  
Author(s):  
Alberto Viglione ◽  
Magdalena Rogger ◽  
Herbert Pirkl ◽  
Juraj Parajka ◽  
Günter Blöschl
Keyword(s):  
Model Building ◽  
A Priori ◽  
Realistic Model ◽  
Model Parameters ◽  
Runoff Generation ◽  
Discharge Data ◽  
Lumped Model ◽  
Generation Mechanisms ◽  
The Right ◽  
Model Structures

Abstract Since the beginning of hydrological research hydrologists have developed models that reflect their perception about how the catchments work and make use of the available information in the most efficient way. In this paper we develop hydrologic models based on field-mapped runoff generation mechanisms as identified by a geologist. For four different catchments in Austria, we identify four different lumped model structures and constrain their parameters based on the field-mapped information. In order to understand the usefulness of geologic information, we test their capability to predict river discharge in different cases: (i) without calibration and (ii) using the standard split-sample calibration/ validation procedure. All models are compared against each other. Results show that, when no calibration is involved, using the right model structure for the catchment of interest is valuable. A-priori information on model parameters does not always improve the results but allows for more realistic model parameters. When all parameters are calibrated to the discharge data, the different model structures do not matter, i.e., the differences can largely be compensated by the choice of parameters. When parameters are constrained based on field-mapped runoff generation mechanisms, the results are not better but more consistent between different calibration periods. Models selected by runoff generation mechanisms are expected to be more robust and more suitable for extrapolation to conditions outside the calibration range than models that are purely based on parameter calibration to runoff data.

scholarly journals CHAOTIC INFLATION BASED ON AN ABELIAN D-FLAT DIRECTION

1995 ◽  
Vol 10 (38) ◽  
pp. 2923-2930 ◽  
Author(s):  
DAIJIRO SUEMATSU ◽  
YOSHIO YAMAGISHI
Keyword(s):  
Neutrino Mass ◽  
Solar Neutrino ◽  
Model Building ◽  
Realistic Model ◽  
Lepton Number ◽  
Coherent Oscillation ◽  
Solar Neutrino Problem ◽  
The Right ◽  
Chaotic Inflation

We study the inflation due to the D-flat direction of an extra U(1). This scenario is a hybrid of a right-handed sneutrino inflaton scenario and a gauge nonsinglet inflaton scenario. The inflaton is a gauge nonsinglet field which induces a right-handed neutrino mass spontaneously through an extra U(1) D-flat direction. This right-handed neutrino mass can be used to explain the solar neutrino problem. The reheating temperature resulting from the decay of the coherent oscillation of the right-handed sneutrino is sufficiently high so that the baryogenesis based on the lepton number asymmetry can be applicable. We also discuss the realistic model building.

FLIPPED SU(6) FROM TEN DIMENSIONS

1990 ◽  
Vol 05 (12) ◽  
pp. 2359-2390 ◽  
Author(s):  
C. PANAGIOTAKOPOULOS
Keyword(s):  
Discrete Symmetries ◽  
Model Building ◽  
Realistic Model ◽  
Low Energy ◽  
Internal Space ◽  
Fast Proton ◽  
Hierarchy Problem ◽  
Four Dimensions ◽  
Gauge Hierarchy ◽  
Breaking Scale

We study the compactification of the heterotic superstring on the only known three generation Calabi-Yau space with flux breakings leading to SU (6) × U (1) as the gauge group in four dimensions. We compute the 'massless' spectrum and identify the discrete symmetries of the internal space that survive flux breaking. The possible four-dimensional models are classified according to their honest discrete symmetries. The allowed breaking chains of SU (6) × U (1) are listed. Model building with SU (6) × U (1) is discussed in general and a concrete realistic model is constructed which does not suffer from the gauge hierarchy problem, fast proton decay or any other obvious phenomenological disaster. A distinct experimental signature of this class of models is the presence in the low energy spectrum of vector-like quarks and antiquarks, outside the three known families, with masses of the order of the supersymmetry breaking scale.

scholarly journals MODELS OF PARTICLE PHYSICS FROM TYPE IIB STRING THEORY AND F-THEORY: A REVIEW

2013 ◽  
Vol 28 (05n06) ◽  
pp. 1330005 ◽  
Author(s):  
ANSHUMAN MAHARANA ◽  
ERAN PALTI
Keyword(s):  
String Theory ◽  
Particle Physics ◽  
Model Building ◽  
Realistic Model ◽  
Theory Model ◽  
Strongly Coupled ◽  
Moduli Stabilization ◽  
Physics Model ◽  
Type Iib String Theory ◽  
Review Model

We review particle physics model building in type IIB string theory and F-theory. This is a region in the landscape where in principle many of the key ingredients required for a realistic model of particle physics can be combined successfully. We begin by reviewing moduli stabilization within this framework and its implications for supersymmetry breaking. We then review model building tools and developments in the weakly coupled type IIB limit, for both local D3-branes at singularities and global models of intersecting D7-branes. Much of recent model building work has been in the strongly coupled regime of F-theory due to the presence of exceptional symmetries which allow for the construction of phenomenologically appealing Grand Unified Theories. We review both local and global F-theory model building starting from the fundamental concepts and tools regarding how the gauge group, matter sector and operators arise, and ranging to detailed phenomenological properties explored in the literature.

Realistic model building with the Akulov-Volkov superfield and supergravity

1983 ◽  
Vol 226 (2) ◽  
pp. 289-298 ◽  
Author(s):  
Stuart Samuel ◽  
Julius Wess
Keyword(s):  
Model Building ◽  
Realistic Model

On the influence of specimen thickness in TEM images of super-conducting vortices

1996 ◽  
Vol 54 ◽  
pp. 724-725
Author(s):  
J. Bonevich ◽  
D. Capacci ◽  
G. Pozzi ◽  
K. Harada ◽  
H. Kasai ◽  
...  
Keyword(s):  
Flux Line ◽  
Analytical Form ◽  
Realistic Model ◽  
Electron Holography ◽  
Specimen Thickness ◽  
Flux Tubes ◽  
Analytical Expression ◽  
Flux Lines ◽  
Normal Core ◽  
Two Parameters

The successful observation of superconducting flux lines (fluxons) in thin specimens both in conventional and high Tc superconductors by means of Lorentz and electron holography methods has presented several problems concerning the interpretation of the experimental results. The first approach has been to model the fluxon as a bundle of flux tubes perpendicular to the specimen surface (for which the electron optical phase shift has been found in analytical form) with a magnetic flux distribution given by the London model, which corresponds to a flux line having an infinitely small normal core. In addition to being described by an analytical expression, this model has the advantage that a single parameter, the London penetration depth, completely characterizes the superconducting fluxon. The obtained results have shown that the most relevant features of the experimental data are well interpreted by this model. However, Clem has proposed another more realistic model for the fluxon core that removes the unphysical limitation of the infinitely small normal core and has the advantage of being described by an analytical expression depending on two parameters (the coherence length and the London depth).

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