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Selected Papers from “Testing Gravity 2023”
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Selected Papers from “Testing Gravity 2023”

A special issue of Particles (ISSN 2571-712X).

Deadline for manuscript submissions: closed (1 November 2023) | Viewed by 3980

Special Issue Editors

Dr. Andrei V. Frolov

E-Mail Website
Guest Editor
Department of Physics, Simon Fraser University, Burnaby, BC V5A 1S6, Canada
Interests: cosmic microwave background physics and models of inflation; polarized dust and other astrophysical foregrounds; modified theories of gravity; reheating and simulations of the Big Bang; black hole physics and numerical relativity
Dr. Makoto Fujiwara

E-Mail Website
Guest Editor
TRIUMF, 4004 Wesbrook Mall, Vancouver, BC V6T 2A3, Canada
Interests: particle physics; anti-matter experiments; anti-hydrogen
Dr. Levon Pogosian

E-Mail Website
Guest Editor
Department of Physics, Simon Fraser University, Burnaby, BC V5A 1S6, Canada
Interests: cosmic microwave background; large-scale structure; dark energy; cosmological tests of gravity; primordial magnetic fields; and topological defects such as cosmic strings; domain walls; magnetic monopoles
Dr. Dimitrios Psaltis

E-Mail Website
Guest Editor
School of Physics, Georgia Tech, 837 State St NW, Atlanta, GA 30332, USA
Interests: physics of neutron stars and black holes; properties of magnetohydrodynamic turbulence in accretion flows; testing the theory of general relativity in a strong-field regime; the physics responsible for the accelerating universe
Dr. Douglas Scott

E-Mail Website
Guest Editor
Department of Physics and Astronomy, University of British Columbia, Vancouver, BC V6T 1Z1, Canada
Interests: structure formation; cosmic microwave background; early universe; high redshift galaxies; sub-mm observations; astrostatistics
Dr. Alessandra Silvestri

E-Mail Website
Guest Editor
Institute Lorentz, Leiden University, PO Box 9506, 2300 RA Leiden, The Netherlands
Interests: cosmology and astroparticle physics; dark energy; gravitational waves

Special Issue Information

Dear Colleagues,

With great pleasure, we would like to announce that, based on presentations at “Testing Gravity 2023” (TG2023) (https://www.sfu.ca/physics/cosmology/TestingGravity2023/), selected papers will be published in this Special Issue of Particles, an MDPI open access journal. Manuscripts submitted to this Special Issue should contain original work or be a review of the field of expertise of the author(s). All submissions will be peer reviewed by internationally recognized experts.

“Testing Gravity 2023” is the 4th in a series that aims to bring together leading experts on various ways of testing the laws of gravity. Testing gravity remains a topical theme because of the unexplained nature of dark matter and dark energy in addition to the long-standing failure to reconcile gravity with quantum physics. TG2023, similarly to the previous meetings in 2015, 2017, and 2019, will feature the latest updates from gravitational wave and astrophysical observatories, lab-based experiments, as well as discussions of recent theoretical advances. The conference aims to provide theorists working on extensions of General Relativity with a realistic perspective on what aspects of their theories can be tested. On the other hand, experimentalists and observers will get a chance to learn new ideas that can be tested using their experiments.

We invite you to submit accounts of original research relevant to this topic for publication in this Special Issue of Particles. The article processing charge (APC) for submissions from the conference will be waived, meaning that publication will be free of charge.

Dr. Andrei V. Frolov
Dr. Makoto Fujiwara
Dr. Levon Pogosian
Dr. Dimitrios Psaltis
Dr. Douglas Scott
Dr. Alessandra Silvestri
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 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. Particles 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) for publication in this open access journal is 1600 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.

Published Papers (3 papers)

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Research

17 pages, 453 KiB  
Article
Testing Higher Derivative Gravity through Tunnelling
by Ruth Gregory and Shi-Qian Hu
Particles 2024, 7(1), 144-160; https://doi.org/10.3390/particles7010008 - 16 Feb 2024
Viewed by 883
Abstract
Higher derivative terms in the gravitational action are natural from the perspective of quantum gravity, but are perceived as leading to a lack of well-posedness. The Gauss–Bonnet term has second-order equations of motion, but does not impact gravitational dynamics in 4D, so one [...] Read more.
Higher derivative terms in the gravitational action are natural from the perspective of quantum gravity, but are perceived as leading to a lack of well-posedness. The Gauss–Bonnet term has second-order equations of motion, but does not impact gravitational dynamics in 4D, so one might expect that it is not physically relevant. We discuss how signatures can show up in tunnelling processes and whether these will likely be physically accessible in Higgs vacuum decay. Full article
(This article belongs to the Special Issue Selected Papers from “Testing Gravity 2023”)
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24 pages, 1365 KiB  
Article
From Scalar Clouds to Rotating Hairy Black Holes
by Gustavo García, Marcelo Salgado, Philippe Grandclément and Eric Gourgoulhon
Particles 2024, 7(1), 1-24; https://doi.org/10.3390/particles7010001 - 21 Dec 2023
Viewed by 1069
Abstract
First, we review the solutions of a complex-valued scalar field, termed scalar clouds, with and without electric charge, when coupled to a rotating Kerr–Newman (electrically charged) or Kerr (neutral) black hole (BH), respectively. To this aim, we determine the conditions and parameters [...] Read more.
First, we review the solutions of a complex-valued scalar field, termed scalar clouds, with and without electric charge, when coupled to a rotating Kerr–Newman (electrically charged) or Kerr (neutral) black hole (BH), respectively. To this aim, we determine the conditions and parameters that characterize the existence of solutions that represent bound states, with an energy-momentum tensor that respect the symmetries of the underlying spacetimes, even if the backreaction of the field is not taken into account at this stage. In particular, we show that in the extremal Kerr scenario the cloud solutions exist only when the mass of the BH satisfies certain bounds, which are obtained by analyzing an effective potential associated with the radial dependency of the scalar clouds that leads to a Schrödinger-like equation. Second, when the backreaction of the field in the spacetime is taken into account, we present a family of stationary, axisymmetric and asymptotically flat solutions of the Einstein–Klein–Gordon system that represent genuine rotating hairy black holes (RHBHs) and provide different values of some global quantities associated with them, such as the Komar mass and the Komar angular momentum. We also compute RHBH solutions with nodes in the radial part of the scalar field and also for a higher azimuthal number m. Full article
(This article belongs to the Special Issue Selected Papers from “Testing Gravity 2023”)
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32 pages, 438 KiB  
Article
Off-Shell Duality Invariance of Schwarzschild Perturbation Theory
by Adam R. Solomon
Particles 2023, 6(4), 943-974; https://doi.org/10.3390/particles6040061 - 07 Nov 2023
Cited by 1 | Viewed by 1023
Abstract
We explore the duality invariance of the Maxwell and linearized Einstein–Hilbert actions on a non-rotating black hole background. On-shell, these symmetries are electric–magnetic duality and Chandrasekhar duality, respectively. Off-shell, they lead to conserved quantities; we demonstrate that one of the consequences of these [...] Read more.
We explore the duality invariance of the Maxwell and linearized Einstein–Hilbert actions on a non-rotating black hole background. On-shell, these symmetries are electric–magnetic duality and Chandrasekhar duality, respectively. Off-shell, they lead to conserved quantities; we demonstrate that one of the consequences of these conservation laws is that even- and odd-parity metric perturbations have equal Love numbers. Along the way, we derive an action principle for the Fackerell–Ipser equation and Teukolsky–Starobinsky identities in electromagnetism. Full article
(This article belongs to the Special Issue Selected Papers from “Testing Gravity 2023”)
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