Beyond the Standard Cosmological Model in the Multi-messenger Era

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

Deadline for manuscript submissions: closed (30 November 2020) | Viewed by 5442

Special Issue Editor

Special Issue Information

Dear Colleagues,

The most accredited paradigm which traces out the universe expansion history is the standard ΛCDM model. The model has captured renewed attention, since, from a genuine observational point of view, it well adapts to cosmic data. Further, the model makes use of the fewest number of assumptions possible, because it employs a cosmological constant Λ which drives the current acceleration. Even though appealing and straightforward, the discrepancies between quantum field predictions and cosmic observations, as well as the unexpected coincidence problem between the matter and Λ densities today, are dramatic. In these respects, the ΛCDM model seems to be incomplete, albeit its simplicity turns out to be the startling suit to admit its validity. Therefore, if on the one hand the cosmic acceleration is a well-consolidated fact, on the other hand it is not so clear whether the ΛCDM model is effectively the final paradigm of the whole dynamics.

In the recent years, alternative scenarios, such as dark energy models, extended theories of gravity, non-homogeneous scenarios, back-reaction, etc., have been widely explored to ascertain if the ΛCDM model is the correct paradigm. However, all these attempts have been so far unsuccessful to portray large-scale dynamics. More likely, the final paradigm to describe the universe dynamics would be the one unifying the late-time acceleration with other cosmic phases, among which the Big Bang, the Inflation, the reheating, and so forth.

The main purpose of this Special Issue is to sketch alternative treatments to the ΛCDM model, dusting off Λ as interchangeable with other possibilities. To this end, the guidelines to follow are wide, spanning from phenomenological dark energy reconstructions, passing through barotropic fluids as alternative frameworks, to higher-dimensional theories of gravity. We thus embrace scenarios involving different epochs of universe’s evolution: at early times, concerning the effects of quantum cosmology and quantum field theories, in intermediate epochs, dealing with galaxy formation and dark matter models, up to the late-time era, in which dark energy is the most prominent ingredient within the cosmic puzzle. Therefore, manuscripts based on a vast number of topics, such as dark energy, dark matter, small perturbations, early time cosmology, quantum gravity, extended theories of gravity, etc., are warmly welcome.

Prof. Orlando Luongo
Guest Editor

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Keywords

  • Observational and theoretical cosmology
  • Dark energy
  • Cosmological constant problem
  • Cosmography
  • Dark matter
  • Galaxy formation
  • Small perturbations
  • Extended theories of gravity
  • Inflationary phases
  • Quantum cosmology
  • Quantum field theory

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Published Papers (2 papers)

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Research

12 pages, 902 KiB  
Article
A Confront between Amati and Combo Correlations at Intermediate and Early Redshifts
by Marco Muccino
Symmetry 2020, 12(7), 1118; https://doi.org/10.3390/sym12071118 - 5 Jul 2020
Cited by 6 | Viewed by 1969
Abstract
I consider two gamma-ray burst (GRB) correlations: Amati and Combo. After calibrating them in a cosmology-independent way by employing Beziér polynomials to approximate the Observational Hubble Dataset (OHD), I perform Markov Chain Monte Carlo (MCMC) simulations within the Λ CDM and the [...] Read more.
I consider two gamma-ray burst (GRB) correlations: Amati and Combo. After calibrating them in a cosmology-independent way by employing Beziér polynomials to approximate the Observational Hubble Dataset (OHD), I perform Markov Chain Monte Carlo (MCMC) simulations within the Λ CDM and the wCDM models. The results from the Amati GRB dataset do not agree with the standard Λ CDM model at a confidence level 3 σ . For the Combo correlation, all MCMC simulations give best-fit parameters which are consistent within 1– σ with the Λ CDM model. Pending the clarification of whether the diversity of these results is statistical, due to the difference in the dataset sizes, or astrophysical, implying the search for the most suited correlation for cosmological analyses, future investigations require larger datasets to increase the predictive power of both correlations and enable more refined analyses on the possible non-zero curvature of the Universe and the dark energy equation of state and evolution. Full article
(This article belongs to the Special Issue Beyond the Standard Cosmological Model in the Multi-messenger Era)
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27 pages, 486 KiB  
Article
Dynamical Properties of Dark Energy Models in Fractal Universe
by Muhammad Umair Shahzad, Ayesha Iqbal and Abdul Jawad
Symmetry 2019, 11(9), 1174; https://doi.org/10.3390/sym11091174 - 16 Sep 2019
Cited by 3 | Viewed by 2880
Abstract
In this paper, we consider the flat FRW spacetime filled with interacting dark energy and dark matter in fractal universe. We work with the three models of dark energy named as Tsallis, Renyi and Sharma–Mittal. We investigate different cosmological implications such as equation [...] Read more.
In this paper, we consider the flat FRW spacetime filled with interacting dark energy and dark matter in fractal universe. We work with the three models of dark energy named as Tsallis, Renyi and Sharma–Mittal. We investigate different cosmological implications such as equation of state parameter, squared speed of sound, deceleration parameter, statefinder parameters, ω e f f ω e f f (where prime indicates the derivative with respect to ln a , and a is cosmic scale factor) plane and Om diagnostic. We explore these parameters graphically to study the evolving universe. We compare the consistency of dark energy models with the accelerating universe observational data. All three models are stable in fractal universe and support accelerated expansion of the universe. Full article
(This article belongs to the Special Issue Beyond the Standard Cosmological Model in the Multi-messenger Era)
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