Expert Opinion on Astronomy and Astrophysics

Editor-in-ChiefSomaya Saad

ISSN: 2529-7813 (Online)

Journal Abbreviation: Expert Opin Astron Astrophys

Publication Frequency: irregular

Article Processing Charges (APC): Click here for more details

Publishing Model: Open Access

Journal no: 18P

About the Journal

The Astronomy and Astrophysics Expert Advice is an international open access journal that publishes original research papers and commentary on various fields of astronomy and astrophysics.

Recently Published Articles

Original Research Articles

Yu. A. Baurov, I. F. Malov
121 Views, 52 PDF Downloads
Two models of gamma-ray bursts using the theory of byuons (TB) are considered. This theory describes a “life” of special unobservable discrete objects from which the surrounding space and the world of   ultimate particles are formed. Basic axioms and some conclusions of this theory are discussed. It is shown that basic problems with nature of gamma-rays bursts can be solved in the framework of this theory not only for bursts connected with supernova explosions but also for those without explosions.

Original Research Articles

Mark D. Roberts
89 Views, 46 PDF Downloads

If one assumes higher dimensions and that dimensional reduction from higher dimensions produces scalar-tensor theory and also that Palatini variation is the correct method of varying scalar-tensor theory then spacetime is nonmetric. Palatini variation of Jordan frame lagrangians gives an equation relating the dilaton to the object of non-metricity and hence the existence of the dilaton implies that the spacetime connection is more general than that given soley by the Christoffel symbol of general relativity. Transferring from Jordan to Einstein frame, which connection, lagrangian, field equations and stress conservation equations occur are discussed: it is found that the Jordan frame has more information, this can be expressed in several ways, the simplest is that the extra information corresponds to the function multiplying the Ricci scalar in the action. The Einstein frame has the advantages that stress conservation implies no currents and that the field equations are easier to work with. This is illustrated by application to Robertson-Walker spacetime.


Original Research Articles

Madhu Kashyap Jagadeesh
54 Views, 53 PDF Downloads

Search of life elsewhere in the galaxy is very fascinating area for planetary scientists and astrobiologists. Earth Similarity Index (ESI) is defined as geometrical mean of four physical parameters (Such as radius, density, escape velocity and surface temperature), which is ranging from 1 (identical to Earth) to 0 (dissimilar to Earth). In this work, ESI is re-defined as six parameters by introducing the two new physical parameters like revolution and surface gravity and is called as New Earth Similarity Index (NESI). The main focus of this paper is to search Tardigrade water-life on exoplanets by varying the temperature parameter in NESI, which is called as Tardigrade Similarity Index (TSI), which is ranging from 1 (Potentially Tardigrade can survive) to 0 (Tardigrade Cannot survive). The NESI and TSI data is cataloged and analyzed for almost 3370 confirmed exoplanets and the results are discussed


Original Research Articles

Paniveni Udayashankar
90 Views, 38 PDF Downloads

Abstract: A dependence of the area of supergranular cells with respect to the Latitude is studied and it is found that the cells are situated symmetrically about the ±250 latitude.

Fractal dimension of the supergranular cells also shows a marginal latitudinal dependence, variation being in the range 1.6–1.7 in the latitudinal limits of ±300. Fractal dimension D for supergranulation is obtained according to the relation P  AD/2 where ‘A is the area and ‘P’ is the perimeter of the supergranular cells. A difference in the fractal dimension between the active and quiet region cells is noted which is conjectured to be due to the magnetic activity level.

Supergranular cells are essentially a manifestation of convective phenomena. They can shed light on the physical conditions in the convection zone of the Sun. Moreover, supergranules play a key role in the transport and dispersal of magnetic fields as it is an important step in our quest to understand the solar cycle.


Original Research Articles

Johann Albers
121 Views, 186 PDF Downloads
In the 1990s Eugene Podkletnov published results of experiments which in his opinion proved the effect of gravity shielding. The present paper is concerned with the question, what results may be expected from such experiments on the basis of the "Alternative Reflections on Gravitation", (ARG). The results of these considerations are in excellent agreement with those experiments. There, however, appeared no gravity shielding, but the production of additional, highly focused repulsive forces. Such curious results can hardly be explained on the basis of classical gravitational theories, which deal with attractive forces and their strong decrease with distance.
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Indexing and Archiving

Expert Opinion on Astronomy and Astrophysics (EOAA) aims to be indexed by world-recognized databases, for example, PubMed, Scopus and Science Citation Index (SCI). EOAA has been indexed and archived by several databases:

Editorial Board


Somaya Saad, National Research Inst of Astronomy-Geophysics, Helwân Observatory, Cairo, Egypt

Editorial Board

Khaled Abdalla Edris, Al-Azhar University, Faculty of Science, Astronomy Department, Nasr City, Cairo, Egypt
Zainab Mohamed Awad, Department of Astronomy, Space Science, and Meteorology, Faculty of Science, Egypt
Abd El Fady Beshara Morcos, Astronomy, National Research Institute of Astronomy and Geophysics, Egypt
Magdy Mahrous Elkhateeb, Astronomy, National Research Institute of Astronomy and Geophysics, Egypt
Mohamed Ibrahim Nouh, Astronomy, National Research Institute of Astronomy and Geophysics, Egypt
Osama Mahmoud Shalabiea, Department of Astronomy, Faculty of Science Cairo University, Giza, Egypt

Focus and Scope

Expert Opinion on Astronomy and Astrophysics is an international Open Access journal that publishes original research articles and review articles related to all areas of Astronomy and Astrophysics. This journal covers all the fields of astronomy and astrophysics, including articles in observational and theoretical astrophysics, physics of the Sun, stellar spectroscopy, radio astronomy, stellar astronomy, extragalactic astronomy, cosmology, astrochemistry, astrobiology astrometric methods and instrumentation. In addition analysis and interpretation of the observational data in different wave bands of the electromagnetic radiation produced by space satellites and observatories are welcome.

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Journal TitleAPC
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Whioce Publishing Pte Ltd  and the Editor-in-chief invite all authors  to submit their  manuscripts to  our  newly launched  journal, Expert Opinion on Astronomy and Astrophysics, for peer review.

Posted: 2017-06-08
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