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Universe, Volume 9, Issue 11

November 2023 - 30 articles

Cover Story: In this paper, we study analytical approximate solutions for second-order homogeneous differential equations with the existence of only two turning points (but without poles) by using the uniform asymptotic approximation (UAA) method. To be more concrete, we consider the Pöschl–Teller (PT) potential, for which analytical solutions are known. Depending on the values of the parameters involved in the PT potential, we find that the upper bounds of the errors of the approximate solutions in general are ≲0.15∼10% for the first-order approximation of the UAA method. The approximations can be easily extended to high orders, for which the errors are expected to be much smaller. Such obtained analytical solutions can be used to study cosmological perturbations in the framework of quantum cosmology as well as quasi-normal modes of black holes. View this paper
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Articles (30)

  • Article
  • Open Access
1,999 Views
26 Pages

20 November 2023

After finding a solution for the Hayward regular black hole (HRBH) in massive gravity, we embed the (3+1)-dimensional HRBHs both in massless and in massive gravities into (5+2)- and (6+3)-dimensional Minkowski spacetimes, respectively. Here, massive...

  • Article
  • Open Access
9 Citations
1,945 Views
31 Pages

20 November 2023

In this work, we search for observational evidence of higher-order secular perturbations in three eclipsing binaries. These are slightly eccentric binaries, and they form the inner pairs of tight, compact, hierarchical triple star systems. Simultaneo...

  • Article
  • Open Access
6 Citations
1,962 Views
8 Pages

15 November 2023

We revisit the problem of constructing consistent interactions between a massive spin-3/2 field and a partially massless graviton in four-dimensional (anti) de Sitter (A)dS4 spacetime. We use the Stueckelberg formulation of the action principle for t...

  • Article
  • Open Access
2 Citations
1,723 Views
19 Pages

14 November 2023

In the framework of the Einstein–Dirac-aether theory we consider a phenomenological model of the spontaneous growth of the fermion number, which is triggered by the dynamic aether. The trigger version of spinorization of the early Universe is a...

  • Article
  • Open Access
2,166 Views
22 Pages

Molecular-Clump Detection Based on an Improved YOLOv5 Joint Density Peak Clustering

  • Jin-Bo Hu,
  • Yao Huang,
  • Sheng Zheng,
  • Zhi-Wei Chen,
  • Xiang-Yun Zeng,
  • Xiao-Yu Luo and
  • Chen Long

11 November 2023

The detection and analysis of molecular clumps can lead to a better understanding of star formation in the Milky Way. Herein, we present a molecular-clump-detection method based on improved YOLOv5 joint Density Peak Clustering (DPC). The method emplo...

  • Article
  • Open Access
2,176 Views
20 Pages

Why Are Some Radio Galaxies Detected by Fermi, but Others Not?

  • Danyi Huang,
  • Xuhong Ye,
  • Xiao Ye,
  • Xiulin Huang,
  • Yanjun Qian,
  • Ziyan Li,
  • Chengfeng Li,
  • Jiru Liao,
  • Hengji Zhang and
  • Zhiyuan Pei
  • + 2 authors

8 November 2023

Aiming to answer an interesting question on why some radio sources can be detected by Fermi-LAT but others cannot, we compare several parameters of Fermi-detected Fanaroff-Riley radio galaxies (FFRs) and non-Fermi-detected sources (NFFRs), including...

  • Article
  • Open Access
4 Citations
2,229 Views
19 Pages

Dark Matter in Fractional Gravity III: Dwarf Galaxies Kinematics

  • Francesco Benetti,
  • Andrea Lapi,
  • Giovanni Gandolfi,
  • Minahil Adil Butt,
  • Yacer Boumechta,
  • Balakrishna S. Haridasu and
  • Carlo Baccigalupi

8 November 2023

Recently, we put forward a framework where the dark matter (DM) component within virialized halos is subject to a non-local interaction originated by fractional gravity (FG) effects. In previous works, we demonstrated that such a framework can substa...

  • Article
  • Open Access
4 Citations
2,033 Views
22 Pages

Automatic Classification of Spectra with IEF-SCNN

  • Jingjing Wu,
  • Yanxia Zhang,
  • Meixia Qu,
  • Bin Jiang and
  • Wenyu Wang

8 November 2023

Telescopes such as the Large Sky Area Multi-Object Spectroscopic Telescope and the Sloan Digital Sky Survey have produced an extensive collection of spectra, challenging the feasibility of manual classification in terms of accuracy and efficiency. To...

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Universe - ISSN 2218-1997