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Galaxies
Special Issues
Particle Physics and Quantum Gravity Implications for Cosmology
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Particle Physics and Quantum Gravity Implications for Cosmology

A special issue of Galaxies (ISSN 2075-4434).

Deadline for manuscript submissions: closed (31 December 2013) | Viewed by 17637

Special Issue Editor

Prof. Dr. Gerald B. Cleaver

E-Mail Website
Guest Editor
Early Universe Cosmology and Strings (EUCOS) Group, Center for Astrophysics, Space Physics and Engineering Research (CASPER), Baylor University, Waco, TX 76798, USA
Interests: quantum field theory; quantum gravity; quantum cosmology; traversable wormholes; Casimir effect; quantum information theory; quantum thermodynamics; philosophical foundations of quantum mechanics; multiverse concepts
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Various fields of study in theoretical particle physics and quantum gravity are having profound impacts on cosmology. Our understanding of the universe has been and continues to be deeply altered by advancements in these fields. The present “special issue” is to focus on the current cosmological implications of fields within these two realms. We would like to call for papers disseminating and discussing implications for cosmology resulting from areas of particle physics and quantum gravity, including, but are not limited to:

  • string/M-/F-theory
  • brane interactions
  • loop quantum gravity
  • Horava-Lifshitz gravity
  • trans-Planckian physics
  • causal dynamical triangulation
  • causal sets
  • non-commutative geometries

Review papers are also welcome.

Prof. Dr. Gerald B. Cleaver
Guest Editor

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 submissions that pass pre-check are 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. Galaxies is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1400 CHF (Swiss Francs). 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

  • cosmology
  • cosmological implications
  • quantum field theory
  • universe
  • multiverse

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Published Papers (3 papers)

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Research

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257 KiB  
Article
Quantum Gravity and Cosmological Density Perturbations
by Herbert W. Hamber and Reiko Toriumi
Galaxies 2014, 2(2), 275-291; https://doi.org/10.3390/galaxies2020275 - 11 Jun 2014
Cited by 2 | Viewed by 4383
Abstract
We explore the possible cosmological consequences of a running Newton’s constant, G(⎕), as suggested by the non-trivial ultraviolet fixed point scenario for Einstein gravity with a cosmological constant term. Here, we examine what possible effects a scale-dependent coupling might have on large-scale [...] Read more.
We explore the possible cosmological consequences of a running Newton’s constant, G(⎕), as suggested by the non-trivial ultraviolet fixed point scenario for Einstein gravity with a cosmological constant term. Here, we examine what possible effects a scale-dependent coupling might have on large-scale cosmological density perturbations. Starting from a set of manifestly covariant effective field equations, we develop the linear theory of density perturbations for a non-relativistic perfect fluid. The result is a modified equation for the matter density contrast, which can be solved and thus provides an estimate for the corrections to the growth index parameter, ɤ. Full article
(This article belongs to the Special Issue Particle Physics and Quantum Gravity Implications for Cosmology)

Review

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348 KiB  
Review
String Phenomenology: Past, Present and Future Perspectives
by Alon E. Faraggi
Galaxies 2014, 2(2), 223-258; https://doi.org/10.3390/galaxies2020223 - 22 Apr 2014
Cited by 5 | Viewed by 4605
Abstract
The observation of a scalar resonance at the Large Hadron Collider (LHC), compatible with perturbative electroweak symmetry breaking, reinforces the Standard Model (SM) parameterisation of all subatomic data. The logarithmic evolution of the SM gauge and matter parameters suggests that this parameterisation remains [...] Read more.
The observation of a scalar resonance at the Large Hadron Collider (LHC), compatible with perturbative electroweak symmetry breaking, reinforces the Standard Model (SM) parameterisation of all subatomic data. The logarithmic evolution of the SM gauge and matter parameters suggests that this parameterisation remains viable up to the Planck scale, where gravitational effects are of comparable strength. String theory provides a perturbatively consistent scheme to explore how the parameters of the Standard Model may be determined from a theory of quantum gravity. The free fermionic heterotic string models provide concrete examples of exact string solutions that reproduce the spectrum of the Minimal Supersymmetric Standard Model. Contemporary studies entail the development of methods to classify large classes of models. This led to the discovery of exophobic heterotic-string vacua and the observation of spinor-vector duality, which provides an insight to the global structure of the space of (2,0) heterotic-string vacua. Future directions entail the study of the role of the massive string states in these models and their incorporation in cosmological scenarios. A complementary direction is the formulation of quantum gravity from the principle of manifest phase space duality and the equivalence postulate of quantum mechanics, which suggest that space is compact. The compactness of space, which implies intrinsic regularisation, may be tightly related to the intrinsic finite length scale, implied by string phenomenology. Full article
(This article belongs to the Special Issue Particle Physics and Quantum Gravity Implications for Cosmology)

Other

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667 KiB  
Essay
Explaining Holographic Dark Energy
by Shan Gao
Galaxies 2013, 1(3), 180-191; https://doi.org/10.3390/galaxies1030180 - 3 Oct 2013
Cited by 4 | Viewed by 7563
Abstract
The possible holographic origin of dark energy is investigated. The main existing explanations, namely the UV/IR connection argument of Cohen et al., Thomas’ bulk holography argument, and Ng’s spacetime foam argument, are shown to be not wholly satisfactory. A new explanation is [...] Read more.
The possible holographic origin of dark energy is investigated. The main existing explanations, namely the UV/IR connection argument of Cohen et al., Thomas’ bulk holography argument, and Ng’s spacetime foam argument, are shown to be not wholly satisfactory. A new explanation is then proposed based on the ideas of Thomas and Ng. It is suggested that dark energy originates from the quantum fluctuations of spacetime limited by the event horizon of the universe. Several potential problems of the explanation are also discussed. Full article
(This article belongs to the Special Issue Particle Physics and Quantum Gravity Implications for Cosmology)
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