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Feature Papers in 'Physics' Section 2026

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Special Issue Information

Dear Colleagues,

We are pleased to announce this new Special Issue, titled, “Feature Papers in 'Physics' Section 2026”, online. We aim to introduce new insights into science development or cutting-edge technology, which are expected to contribute significantly to the physics and symmetry field. The issue will include original research and peer-reviewed articles related to the latest research and developments in relevant areas of physics where symmetry plays a key role.

This Special Issue will be a platform for researchers to showcase their scientific work, enabling them to influence the scientific community, as well as the general public.

Prof. Dr. Stefano Profumo
Prof. Dr. Alberto Ruiz-Jimeno
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 250 words) can be sent to the Editorial Office for assessment.

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. Symmetry is an international peer-reviewed open access monthly 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 2400 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

symmetry in mathematical physics
local and global symmetries
continuous symmetries
spacetime symmetries
discrete symmetries and their tests
conservation laws and their tests
gauge theories
lie groups
relativity and tests of Lorentz invariance
spontaneous symmetry breaking
crystal symmetry
conformal symmetry
chiral symmetry and chiral symmetry breaking
dynamical symmetry breaking models
flavor symmetries
symmetries in condensed matter
infinite-dimensional symmetries
quantum group symmetries
baryon and lepton number
crystalline systems and their symmetries
symmetries in models for physics beyond the Standard Model
scaling laws of complex system

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Research

20 pages, 382 KB

Open AccessArticle

Quantizing the Exterior Region of a Schwarzschild–AdS Black Hole Leads to a Resolution of the Information Paradox on a Quantum Level

by Claus Gerhardt

Symmetry 2026, 18(4), 565; https://doi.org/10.3390/sym18040565 - 26 Mar 2026

Viewed by 416

Abstract

We quantize the exterior region of a Schwarzschild–AdS black hole using our model of quantum gravity. The resulting hyperbolic equation is solved by products of temporal eigenfunctions

w_{i}

, the eigenvalues of which all have multiplicity one, and spatial eigendistributions [...] Read more.

We quantize the exterior region of a Schwarzschild–AdS black hole using our model of quantum gravity. The resulting hyperbolic equation is solved by products of temporal eigenfunctions

w_{i}

, the eigenvalues of which all have multiplicity one, and spatial eigendistributions

v_{i j}

having the same eigenvalues but with multiplicities

1 \leq m_{i}

, where the

m_{i}

could in principle be arbitrarily large. Regarding only the exterior region, there was no guidance how to determine the values of the

m_{i}

. However, considering also the quantization of the interior region, where the same question did not arise since the

m_{i}

could be chosen by maximizing the value, it seemed logical to choose the same values, too, in the exterior case. Since the eigenvalues in the interior are the same because the temporal Hamiltonian is the same in both cases, this choice defined a unitary equivalence between the respective Hilbert spaces and the respective Hamiltonians. Hence, there is no information paradox on a quantum level. Full article

(This article belongs to the Special Issue Feature Papers in 'Physics' Section 2026)

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