Special Issue "Theories of Gravity: Alternatives to the Cosmological and Particle Standard Models"

A special issue of Universe (ISSN 2218-1997).

Deadline for manuscript submissions: 31 May 2019

Special Issue Editors

Guest Editor
Prof. Dr. Stefano Bellucci

INFN-Laboratori Nazionali di Frascati, Via E. Fermi 40, 00044 Frascati, Italy
Website | E-Mail
Interests: carbon nanotube; materials science & nanotechnology; multifunctional materials; nano carbon; biomedical applications
Guest Editor
Prof. Orlando Luongo

National Institute for Nuclear Physics, INFN, National Laboratories of Frascati, Frascati, Italy
Website | E-Mail
Interests: dark energy; dark matter; extended theories of gravity; quantum field theory; gravitational physics; space optics

Special Issue Information

Dear Colleagues,

Cosmology and particle physics are complementary frameworks based on two standard paradigms with several intertwined assumptions. Unfortunately, all attempts to unify the aforementioned scenarios have so far been unsuccessful and a wide number of challenges remain open. Examples include unifying gravity with quantum mechanics, relating quantum field theory to the LCDM model, searching for dark matter candidates, laboratory measurement of particles of dark matter, etc.

In lieu of considering separate approaches to addressing these issues, a possible landscape could provide an explanation for current universe dynamics at different epochs in terms of quantum physics, including the presence of dark matter as proof of a possible new physics. Thus, extensions of the models, among them extended theories of gravity, supersymmetry, string theories, dark fluids, etc., would represent possible alternatives to formulating a self-consistent and definitive theory of everything.

The main subject of this issue: "Theories of gravity: alternatives to the cosmological and particle standard models", is thus widely formulated to include several topics. The issue deals with alternative paradigms to cosmology, quantum field theory, extensions of the standard model of particle physics, dark energy and dark matter from the point of view of particle physics, etc. The target lies beyond the usual LCDM model, passing through quantum field theory applied to gravity.

As a consequence, the issue represents the interplay between particle physics and cosmology, with particular emphasis on the role played by particle quantum field theory in the early and the late universe.

Papers based on such topics are therefore warmly welcome for submission.

Prof. Dr. Stefano Bellucci
Prof. Dr. Orlando Luongo
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Universe is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Particle dark matter
  • Quantum cosmology
  • Extended theories of gravity
  • Phenomenology of dark energy
  • Dark fluids and extensions of the ΛCDM paradigm
  • Supersymmetry
  • String theories and cosmology of strings
  • Inflation and effective field representation
  • Measurable quantum corrections
  • Entanglement in the early universe

Published Papers (2 papers)

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Research

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Open AccessArticle Thermodynamic Geometry of Yang–Mills Vacua
Received: 14 December 2018 / Revised: 1 April 2019 / Accepted: 2 April 2019 / Published: 10 April 2019
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Abstract
We study vacuum fluctuation properties of an ensemble of SU(N) gauge theory configurations, in the limit of many colors, viz. Nc, and explore the statistical nature of the topological susceptibility by analyzing its critical behavior [...] Read more.
We study vacuum fluctuation properties of an ensemble of S U ( N ) gauge theory configurations, in the limit of many colors, viz. N c , and explore the statistical nature of the topological susceptibility by analyzing its critical behavior at a non-zero-vacuum parameter θ and temperature T. We find that the system undergoes a vacuum phase transition at the chiral symmetry restoration temperature as well as at an absolute value of θ . On the other hand, the long-range correlation length solely depends on θ for the theories with critical exponent e = 2 or T = T d + 1 , where T d is the decoherence temperature. Furthermore, it is worth noticing that the unit-critical exponent vacuum configuration corresponds to a non-interacting statistical basis pertaining to a constant mass of η . Full article
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Review

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Open AccessReview Embedding Black Holes and Other Inhomogeneities in the Universe in Various Theories of Gravity: A Short Review
Universe 2018, 4(10), 109; https://doi.org/10.3390/universe4100109
Received: 18 September 2018 / Revised: 8 October 2018 / Accepted: 9 October 2018 / Published: 16 October 2018
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Abstract
Classic black hole mechanics and thermodynamics are formulated for stationary black holes with event horizons. Alternative theories of gravity of interest for cosmology contain a built-in time-dependent cosmological “constant” and black holes are not stationary. Realistic black holes are anyway dynamical because they [...] Read more.
Classic black hole mechanics and thermodynamics are formulated for stationary black holes with event horizons. Alternative theories of gravity of interest for cosmology contain a built-in time-dependent cosmological “constant” and black holes are not stationary. Realistic black holes are anyway dynamical because they interact with astrophysical environments or, at a more fundamental level, because of backreaction by Hawking radiation. In these situations, the teleological concept of event horizon fails and apparent or trapping horizons are used instead. Even as toy models, black holes embedded in cosmological “backgrounds” and other inhomogeneous universes constitute an interesting class of solutions of various theories of gravity. We discuss the known phenomenology of apparent and trapping horizons in these geometries, focusing on spherically symmetric inhomogeneous universes. Full article
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