Feature Papers in the Astronomical Sciences

A special issue of Astronomy (ISSN 2674-0346).

Deadline for manuscript submissions: 31 October 2024 | Viewed by 3537

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1. Institute of Gravitation and Cosmology, RUDN University, ul. Miklukho-Maklaya 6, 117198 Moscow, Russia
2. Research Laboratory of Geometry, Dynamical Systems, and Cosmology, University of the Aegean, 83200 Mitilini, Samos, Greece
Interests: relativistic cosmology; modified gravity; particle cosmology; quantum and string cosmology; aspects of astrophysical and observational cosmology; dynamical systems; history of cosmology and astronomy

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Laboratoire de Physique Théorique et Hautes Énergies - LPTHE, Sorbonne Université, CNRS, 4 Place Jussieu, 75005 Paris, France
Interests: quantum field theory; particle physics phenomenology; quantum gravity; cosmology; string theory
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Special Issue Information

Dear Colleagues,

I am delighted to announce the Special Issue entitled “Feature Papers in the Astronomical Sciences” dedicated to provide a distinguished collection of pioneering papers in the whole spectrum of astronomy, astrophysics, and cosmology.

This Theme Issue aims to highlight recent advances and new cutting-edge developments across the field of astronomy, by publishing high-quality reviews and original papers from editorial board members, guest editors, leading researchers, and outstanding scholars invited by the Editorial Board and the Editorial Office of Astronomy.

The special issue topics include but are not limited to observational and theoretical astronomy, astrophysics, astroparticle physics, cosmology, as well as on all aspects of gravitational physics.

I hope that this collection will bring new interest in this old field as an attractive node for younger people as well as more experienced researchers who share an interest in this most majestic of all scientific fields. 

Prof. Dr. Spiros Cotsakis
Prof. Dr. Ignatios Antoniadis
Guest Editors

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Keywords

  • observational astronomy
  • observational astrophysics
  • observational cosmology
  • astroparticle physics
  • messengers of the early universe
  • theoretical cosmology
  • gravitational waves and astronomy
  • gravitation and general relativity
  • dark matter and dark energy
  • quantum gravity

Published Papers (1 paper)

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25 pages, 824 KiB  
Technical Note
On the Dynamical Instability of Monatomic Fluid Spheres in (N + 1)-Dimensional Spacetime
by Wei-Xiang Feng
Astronomy 2023, 2(1), 22-46; https://doi.org/10.3390/astronomy2010004 - 2 Mar 2023
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Abstract
In this note, I derive the Chandrasekhar instability of a fluid sphere in (N + 1)-dimensional Schwarzschild–Tangherlini spacetime and take the homogeneous (uniform energy density) solution for illustration. Qualitatively, the effect of a positive (negative) cosmological constant tends to destabilize (stabilize) the [...] Read more.
In this note, I derive the Chandrasekhar instability of a fluid sphere in (N + 1)-dimensional Schwarzschild–Tangherlini spacetime and take the homogeneous (uniform energy density) solution for illustration. Qualitatively, the effect of a positive (negative) cosmological constant tends to destabilize (stabilize) the sphere. In the absence of a cosmological constant, the privileged position of (3 + 1)-dimensional spacetime is manifest in its own right. As it is, the marginal dimensionality in which a monatomic ideal fluid sphere is stable but not too stable to trigger the onset of gravitational collapse. Furthermore, it is the unique dimensionality that can accommodate stable hydrostatic equilibrium with a positive cosmological constant. However, given the current cosmological constant observed, no stable configuration can be larger than 1021M. On the other hand, in (2 + 1) dimensions, it is too stable either in the context of Newtonian Gravity (NG) or Einstein’s General Relativity (GR). In GR, the role of negative cosmological constant is crucial not only to guarantee fluid equilibrium (decreasing monotonicity of pressure) but also to have the Bañados–Teitelboim–Zanelli (BTZ) black hole solution. Owing to the negativeness of the cosmological constant, there is no unstable configuration for a homogeneous fluid disk with mass 0<M0.5 to collapse into a naked singularity, which supports the Cosmic Censorship Conjecture. However, the relativistic instability can be triggered for a homogeneous disk with mass 0.5<M0.518 under causal limit, which implies that BTZ holes of mass MBTZ>0 could emerge from collapsing fluid disks under proper conditions. The implicit assumptions and implications are also discussed. Full article
(This article belongs to the Special Issue Feature Papers in the Astronomical Sciences)
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