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Universe, Volume 9, Issue 6

June 2023 - 54 articles

Cover Story: In this study, we reanalyze the running vacuum model (RVM) in full and we find it becomes further buttressed. Using modern cosmological data, namely a compilation of the latest SNIa+BAO+H(z)+LSS+CMB observations, we determine to what extent the RVM provides a high-quality fit that is better than the concordance ΛCDM model, with particular emphasis on its impact on the σ8 and H0 tensions. We utilize the Einstein–Boltzmann system solver CLASS and the Monte Carlo sampler MontePython for the statistical analysis, as well as the statistical DIC criterion to compare the running vacuum against the rigid vacuum (νeff=0). We show that with a tiny amount of vacuum dynamics (νeff≪1), the global fit can improve significantly with respect to the ΛCDM, and the mentioned tensions may subside to inconspicuous levels. View this paper
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Articles (54)

  • Article
  • Open Access
8 Citations
1,491 Views
10 Pages

Black String Solutions in Rainbow Gravity

  • Roberta Dárlla,
  • Francisco A. Brito and
  • Job Furtado

In this paper, we studied black string solutions under the consideration of rainbow gravity. We analytically obtained the solution for four-dimensional black strings in terms of the functions f(E/Ep) and g(E/Ep) that sets the energy scale where the r...

  • Article
  • Open Access
3 Citations
2,029 Views
13 Pages

Pyroxene and Hydroxyl Signatures in Vesta Newly Calibrated Data from Dawn Mission

  • Giuseppe Massa,
  • Andrea Longobardo,
  • Ernesto Palomba,
  • Marianna Angrisani,
  • Chiara Gisellu,
  • Fabrizio Dirri,
  • Maria Cristina De Sanctis,
  • Andrea Raponi,
  • Filippo Giacomo Carrozzo and
  • Mauro Ciarniello

Thanks to the VIR spectrometer onboard NASA’s Dawn spacecraft, which orbited Vesta in 2011–2012, thousands of hyperspectral images of its surface have been collected. The mission confirmed the HED (Howardite–Eucrite–Diogenite)...

  • Article
  • Open Access
1 Citations
2,514 Views
16 Pages

SN 2017fzw: A Fast-Expanding Type Ia Supernova with Transitional Features

  • Jiayu Huang,
  • Yangyang Li,
  • Xiangyun Zeng,
  • Sheng Zheng,
  • Sarah A. Bird,
  • Jujia Zhang,
  • Ali Esamdin,
  • Abdusamatjan Iskandar,
  • K. Azaleee Bostroem and
  • Shuguang Zeng
  • + 8 authors

In this study, we analyzed the optical observations of a subluminous Type Ia supernova (SN Ia) 2017fzw, which exhibited high photospheric velocity (HV) at B-band maximum light. The absolute B-band peak magnitude was determined to be MmaxB=−18.6...

  • Communication
  • Open Access
13 Citations
2,020 Views
10 Pages

E-type α-attractor models of single-field inflation were generalized further in order to accommodate production of primordial black holes (PBHs) via adding a near-inflection point to the inflaton scalar potential at smaller scales, in good agre...

  • Review
  • Open Access
4 Citations
3,056 Views
15 Pages

The Formation of a Rubble Pile Asteroid: Insights from the Asteroid Ryugu

  • Tsutomu Ota,
  • Christian Potiszil,
  • Katsura Kobayashi,
  • Ryoji Tanaka,
  • Hiroshi Kitagawa,
  • Tak Kunihiro,
  • Chie Sakaguchi,
  • Masahiro Yamanaka and
  • Eizo Nakamura

The Hayabusa2 mission returned primitive samples from the C-type asteroid Ryugu to Earth. The C-type asteroids hold clues to the origin of Earth’s water and the building blocks of life. The rubble pile structure of C-type asteroids is a crucial...

  • Article
  • Open Access
1 Citations
2,304 Views
13 Pages

Structure of the Medium Formed in Heavy Ion Collisions

  • J. R. Alvarado García,
  • D. Rosales Herrera,
  • A. Fernández Téllez,
  • Bogar Díaz and
  • J. E. Ramírez

We investigate the structure of the medium formed in heavy ion collisions using three different models: the Color String Percolation Model (CSPM), the Core–Shell-Color String Percolation Model (CSCSPM), and the Color Glass Condensate (CGC) fram...

  • Review
  • Open Access
19 Citations
2,837 Views
13 Pages

The results of experiments on the search for and study of double beta decay processes obtained over the past 5 years (from 2018 to April 2023) are discussed. The results of the search for neutrinoless double beta decay are presented, in which a sensi...

  • Article
  • Open Access
15 Citations
1,874 Views
26 Pages

Holographic Non-Abelian Flavour Symmetry Breaking

  • Johanna Erdmenger,
  • Nick Evans,
  • Yang Liu and
  • Werner Porod

We investigate a holographic model for both spontaneous and explicit symmetry breaking of non-abelian flavour symmetries. This consists of a bottom-up model inspired by the top-down D3/probe D7-brane model. It incorporates the running anomalous dimen...

  • Article
  • Open Access
2 Citations
3,032 Views
43 Pages

Although electrons (fermions)and photons (bosons) produce the same interference patterns in the two-slit experiments, known in optics for photons since the 17th Century, the description of these patterns for electrons and photons thus far was markedl...

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Universe - ISSN 2218-1997