Special Issue "Quantum Gravity Phenomenology and Experimental Implications"

A special issue of Technologies (ISSN 2227-7080). This special issue belongs to the section "Quantum Technologies".

Deadline for manuscript submissions: closed (15 July 2017)

Special Issue Editor

Guest Editor
Dr. Ahmed Farag Ali

Department of Physics, Faculty of Science, Benha University, Benha 13518, Egypt
Website | E-Mail
Interests: quantum physics; quantum gravity; cosmology; black holes; relativity; high energy physics

Special Issue Information

Dear Colleagues,

The quantum theory of gravity is expected to give us a concrete picture of the origin and structure of the universe. Various attempts to formulate quantum gravity have been made in recent decades and formulating this theory remains one of the most important problems in physics. These attempts have included superstring theories, loop quantum gravity, non-commutative geometry, casual sets, etc. The main goal of this Special Issue is to provide a collection of state-of-the-art papers on these topics. We invite submissions related to experimental, theoretical or numerical works which provide concrete predictions of quantum gravity theories that can be tested in a laboratory or using cosmological and astrophysical observations.

Potential topics include, but are not limited to:
  1. Quantum gravity phenomenology.
  2. Experimental consequences of quantum gravity theories.
  3. Quantum gravitational effects on astrophysical objects.
  4. Gravitational waves in modified theories of gravity and quantum gravity theories.
  5. Perturbative quantum gravity.
  6. Black holes and quantum gravity.
  7. Dynamics of galaxies with dark matter in modified theories of gravity and quantum gravity models.

Dr. Ahmed Farag Ali
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 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. Technologies is an international peer-reviewed open access quarterly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) is waived for well-prepared manuscripts submitted to this issue. 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

  • Quantum gravity
  • Black holes 
  • Gravitational waves
  • Dark matter and dark energy

Published Papers (2 papers)

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Research

Open AccessArticle A Conceptual Test for Cognitively Coherent Quantum Gravity Models
Technologies 2017, 5(3), 51; doi:10.3390/technologies5030051
Received: 14 July 2017 / Revised: 3 August 2017 / Accepted: 10 August 2017 / Published: 15 August 2017
PDF Full-text (224 KB) | HTML Full-text | XML Full-text
Abstract
In quantum gravity interpretations, the role of space- and time-related concepts is debated. Some argue that these concepts are not needed to describe physical reality at the Planck scale. Others object that an operational definition of magnitudes cannot get rid of spatiotemporal notions.
[...] Read more.
In quantum gravity interpretations, the role of space- and time-related concepts is debated. Some argue that these concepts are not needed to describe physical reality at the Planck scale. Others object that an operational definition of magnitudes cannot get rid of spatiotemporal notions. We propose a “conceptual test” to assess if the mathematical content of a quantum gravity theory refers to some possibly verifiable empirical model. Given that any physical model describes the evolution of a set of measurables, these must be detectable in any empirical interpretation of a physical theory, including quantum gravity ones. Our test ultimately relies on considerations and studies concerning human cognitive limits in the discrimination of magnitudes. Full article
(This article belongs to the Special Issue Quantum Gravity Phenomenology and Experimental Implications)
Open AccessArticle Accelerated Detector Response Function in Squeezed Vacuum
Technologies 2017, 5(2), 17; doi:10.3390/technologies5020017
Received: 18 February 2017 / Revised: 12 April 2017 / Accepted: 19 April 2017 / Published: 20 April 2017
PDF Full-text (253 KB) | HTML Full-text | XML Full-text
Abstract
Casimir/squeezed vacuum breaks Lorentz symmetry, by allowing light to propagate faster than c. We looked at the possible transformation symmetry group such vacuum could obey. By solving the semi-classical Einstein field equation in squeezed vacuum, we have found that the background geometry
[...] Read more.
Casimir/squeezed vacuum breaks Lorentz symmetry, by allowing light to propagate faster than c. We looked at the possible transformation symmetry group such vacuum could obey. By solving the semi-classical Einstein field equation in squeezed vacuum, we have found that the background geometry describes an Anti-deSitter (AdS) geometry. Therefore, the proper transformation symmetry group is the (A)dS group. One can describe quantum field theory in a finite volume as a quantum field theory (QFT) on AdS background, or vice versa. In particular, one might think of QFT vacuum on AdS as a QFT that posses a squeezed vacuum with boundary conditions proportional to R A d S 2 . Applying this correspondence to an accelerating detector-scalar field system, we notice at low acceleration the system is at equilibrium at ground state, however if the detector’s acceleration (a) is greater than a critical acceleration, the system experience a phase transition similar to Hawking-Page Phase transition at the detector gets excited, with equivalent temperature Θ = a 2 - R A d S 2 2 π . Full article
(This article belongs to the Special Issue Quantum Gravity Phenomenology and Experimental Implications)
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Planned Papers

The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.

 Title: The contribution of quantum hydrodynamic approach to the definition of the quantum-gravity equation

Abstract: The hydrodynamic representation of the quantum mechanics is a classic-like theory where the quantum properties are introduced by a field potential named, after Bohm, quantum potential that describes the property of vacuum at microscopic extent. Introducing this contribution in the Lagrangean form of quantum equations it is possible to define a minimum action principle for quantum systems from which to derive the quantum gravitational equation. The value of the cosmological constant derived from the theory is in agreement with the measured one. The theory shows a possible way to solve the conundrum of quantum-gravitational models.

 

Title: A conceptual test for cognitively coherent quantum gravity models

Abstract: In quantum gravity interpretations, the role of space and time related concepts is debated. Some argue that these concepts are not needed to describe physical reality at the Planck scale. Others object that an operational definition of magnitudes cannot get rid of spatiotemporal notions. We propose a “conceptual test” to assess if the mathematical content of a QG theory refers to some possibly verifiable empirical model. Given that any physical model describes the evolution of a set of measurables, these must be detectable in any empirical interpretation of a physical theory, QG included. Our test ultimately relies on considerations and studies concerning human cognitive limits in the discrimination of magnitudes.

 

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