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Symmetry
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Selected Papers: Symmetry 2019—The Second Edition of the International Conference...
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Selected Papers: Symmetry 2019—The Second Edition of the International Conference on Symmetry

A special issue of Symmetry (ISSN 2073-8994). This special issue belongs to the section "Physics".

Deadline for manuscript submissions: closed (31 March 2020) | Viewed by 8905

Special Issue Editors

Prof. Dr. Emilio Elizalde

E-Mail Website
Guest Editor
Consejo Superior de Investigaciones Científicas, Instituto de Ciencias del Espacio (CSIC), Institut d'Estudis Espacials de Catalunya (IEEC/CSIC), Campus UAB, Carrer de Can Magrans s/n, 08193 Bellaterra (Barcelona), Spain
Interests: zeta functions; regularization of infinite sums; spexial functions of mathemtatical physics; vacuum fluctuations; theoretical cosmology
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Manuel Asorey

E-Mail Website
Guest Editor
Departamento de Física Teórica, Facultad de Ciencias, Universidad de Zaragoza, 50009 Zaragoza, Spain
Interests: quantum gauge theories; quantum information cosmology; quantum topological effects
Prof. Dr. Sergei D. Odintsov

grade E-Mail Website
Guest Editor
ICREA, P. Lluis Companyas 23, 08010 Barcelona and Institute of Space Sciences (IEEC-CSIC), C. Can Magrans s/n, 08193 Barcelona, Spain
Interests: cosmology; dark energy and inflation; quantum gravity; modified gravity and beyond general relativity; quantum fields at external fields
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The Second Edition of the International Conference on Symmetry, supported by the University of Zaragoza and the MDPI journal Symmetry, will be held in Benasque, Spain, 1–7 September, 2019. We welcome scholars, engineers, students, and enterprises to join this large event, and submit abstracts to our conference website.

To promote the results of abstract submissions, all accepted extended abstracts will be published in the journal Proceedings. Full papers are invited to publish in this Special Issue of the journal Symmetry and the conference participants will be granted a 20% discount on the publishing fees.

Manuscripts submitted to Symmetry will receive a thorough peer review and fast publication.

Prof. Dr. Sergei D. Odintsov
Prof. Dr. Emilio Elizalde
Prof. Dr. Manuel Asorey
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Symmetry is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Published Papers (3 papers)

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Research

9 pages, 1210 KiB  
Article
The Symmetry of the Interior and Exterior of Schwarzschild and Reissner–Nordstrom Black Holes—Sphere vs. Cylinder
by Andy T. Augousti, Andrzej Radosz, Pawel Gusin and Aleksander Kaczmarek
Symmetry 2020, 12(5), 859; https://doi.org/10.3390/sym12050859 - 23 May 2020
Cited by 1 | Viewed by 2443
Abstract
One can question the relationship between the symmetries of the exterior and interior of black holes with an isotropic and static exterior. This question is justified by the variety of recent findings indicating substantial or even dramatic differences in the properties of the [...] Read more.
One can question the relationship between the symmetries of the exterior and interior of black holes with an isotropic and static exterior. This question is justified by the variety of recent findings indicating substantial or even dramatic differences in the properties of the exterior and interior of isotropic, static black holes. By invoking some of these findings related to a variety of the thought experiments with freely falling or uniformly accelerated test particles, one can establish the dynamic properties of the interior, which turn out to be equivalent to anisotropic cosmology, simultaneously expanding and contracting, albeit in different directions. In order to illustrate the comparison between the symmetry of the exterior vs. the interior, we apply conventional t, r, θ, φ coordinates to both of these ranges, although on the horizon(s) they display singular behavior. Using a simple approach based on co-moving and freely falling observers, the dynamics of the cylindrically shaped interior are explored. That enables us to present schematic snapshots of the interior of a Schwarzschild black hole, expanding along its cylindrical axis and contracting along its spherical base, as well as the interior of a Reissner–Nordström black hole, expanding first and then contracting along the cylindrical axis up to the terminal instant r =r−. Full article
(This article belongs to the Special Issue Selected Papers: Symmetry 2019—The Second Edition of the International Conference on Symmetry)
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37 pages, 12175 KiB  
Article
Symmetric Free Form Building Structures Arranged Regularly on Smooth Surfaces with Polyhedral Nets
by Jacek Abramczyk
Symmetry 2020, 12(5), 763; https://doi.org/10.3390/sym12050763 - 06 May 2020
Cited by 5 | Viewed by 2647
Abstract
The article is an original insight into interdisciplinary challenges of shaping innovative unconventional complex free form buildings roofed with multi-segment shell structures arranged with using novel parametric regular networks. The roof structures are made up of nominally plane thin-walled folded steel sheets transformed [...] Read more.
The article is an original insight into interdisciplinary challenges of shaping innovative unconventional complex free form buildings roofed with multi-segment shell structures arranged with using novel parametric regular networks. The roof structures are made up of nominally plane thin-walled folded steel sheets transformed elastically and rationally into spatial shapes. A method is presented for creating such symmetric structures based on the regular spatial polyhedral networks created as a result of a composition of many complete reference tetrahedrons by their common flat sides and straight side edges arranged regularly and symmetrically in the three-dimensional Euclidean space. The use of the regularity and symmetry in the process of shaping different forms of (a) single tetrahedral meshes and whole consistent polyhedral structures, (b) individual plane walls and complex elevations, (c) single transformed folds, entire corrugated shell roofs, and their structures allow a creative search for attractive rational parametric solutions using a few author’s parametric algorithms and their implementation as built-in commands of the AutoCAD visual editor or applications of the Rhino/Grasshopper program. Full article
(This article belongs to the Special Issue Selected Papers: Symmetry 2019—The Second Edition of the International Conference on Symmetry)
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Graphical abstract

22 pages, 8648 KiB  
Article
Symmetric Shape Transformations of Folded Shell Roofs Determining Creative and Rational Shaping of Building Free Forms
by Jacek Abramczyk and Aleksandra Prokopska
Symmetry 2019, 11(12), 1438; https://doi.org/10.3390/sym11121438 - 22 Nov 2019
Cited by 4 | Viewed by 2693
Abstract
The paper presents an innovative approach to solving interdisciplinary problems emerging in the design process of building free forms roofed with elastically transformed corrugated shells. The effectiveness and rationality of shaping such free forms and the creativeness in searching for the parametric forms [...] Read more.
The paper presents an innovative approach to solving interdisciplinary problems emerging in the design process of building free forms roofed with elastically transformed corrugated shells. The effectiveness and rationality of shaping such free forms and the creativeness in searching for the parametric forms require the application of their regular and symmetric models which have to be derived from the geometric and mechanical properties of the rationally transformed subsequent folds of these shells. Simplified smooth models used for engineering developments and accurate folded models implemented for scientific research have to be created by means of unconventional methods different from those presented in classical courses. Owing to the variety of the forms of the proposed innovative reference tetrahedrons and their parametric description, the algorithms developed by the authors have to be implemented in computer programs. The rationality of the transformed roof shells, revealed in the limitation of the level of the fold’s initial stresses resulting from the shape transformation, and the attractiveness of these forms are achieved by the axial symmetry and contraction of each shell fold at its half-length. The symmetries adopted in the process of modeling such roof shells are also exploited by the discussed new method to obtain coherent unconventional general forms of entire buildings. Full article
(This article belongs to the Special Issue Selected Papers: Symmetry 2019—The Second Edition of the International Conference on Symmetry)
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