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Analysis of institutional authors

Maria, M Eugenia RosadoCorresponding Author

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February 4, 2026
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On the local classification of four-dimensional Lorentzian real reductive pairs

Publicated to: DIFFERENTIAL GEOMETRY AND ITS APPLICATIONS. 103 102333- - 2026-06-01 103(), DOI: 10.1016/j.difgeo.2026.102333

Authors:

Lopez, Marco Castrillon; Gadea, Pedro M; Komrakov, Boris P; Maria, M Eugenia Rosado
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Affiliations

CSIC, Inst Fis Fundamental, Serrano 113 Bis, Madrid 28006, Spain - Author
Int Sophus Lie Ctr ISLC Sro, Kotlaska 64-5, Prague 18000, Czech Republic - Author
UCM, Fac Matemat, Dept Algebra Geometria & Topol, Plaza Ciencias 3, Madrid 28040, Spain - Author
Univ Politecn Madrid, Escuela Tecn Super Arquitectura, Dept Matemat Aplicada, Avda Juan de Herrera 4, Madrid 28040, Spain - Author
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Abstract

One important piece of work in the classifications started by the seminal works of S. Lie [16,17] is the classification of four-dimensional Lorentzian real reductive pairs. This classification appeared, except for one paper, as preprints of the University of Oslo, where moreover many proofs and implications are (necessarily, due to their length) greatly abridged. Given the relevance of these classifications, we think that an article on the origin, context, methods and relevance of that classification is in order. This is precisely the aim of the present paper. We intend to fill the gaps in the exposition of the ideas that structure these proofs. On the other hand, motivated by the physical applications, we studied in [3] which of Lorentzian symmetric pairs furnish connected simply-connected Einstein-Yang-Mills spaces, obtaining 10 spaces. Since the calculations are rather long (some one hundred fifty pages, only for these cases), we confine ourselves in the present paper to carefully check the arguments for those 10 cases. (c) 2026 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http:// creativecommons.org/licenses/by-nc-nd/4.0/).
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Quality index

Bibliometric impact. Analysis of the contribution and dissemination channel

The work has been published in the journal DIFFERENTIAL GEOMETRY AND ITS APPLICATIONS due to its progression and the good impact it has achieved in recent years, according to the agency WoS (JCR), it has become a reference in its field. In the year of publication of the work, 2026, it was in position 242/492, thus managing to position itself as a Q2 (Segundo Cuartil), in the category Mathematics. Notably, the journal is positioned en el Cuartil Q2 para la agencia Scopus (SJR) en la categoría Geometry and Topology.

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Impact and social visibility

From the perspective of influence or social adoption, and based on metrics associated with mentions and interactions provided by agencies specializing in calculating the so-called "Alternative or Social Metrics," we can highlight as of 2026-04-25:

  • The use of this contribution in bookmarks, code forks, additions to favorite lists for recurrent reading, as well as general views, indicates that someone is using the publication as a basis for their current work. This may be a notable indicator of future more formal and academic citations. This claim is supported by the result of the "Capture" indicator, which yields a total of: 3 (PlumX).

It is essential to present evidence supporting full alignment with institutional principles and guidelines on Open Science and the Conservation and Dissemination of Intellectual Heritage. A clear example of this is:

  • Assignment of a Handle/URN as an identifier within the deposit in the Institutional Repository: https://oa.upm.es/93429/

As a result of the publication of the work in the institutional repository, statistical usage data has been obtained that reflects its impact. In terms of dissemination, we can state that, as of

  • Views: 49
  • Downloads: 27
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Leadership analysis of institutional authors

This work has been carried out with international collaboration, specifically with researchers from: Czech Republic.

There is a significant leadership presence as some of the institution’s authors appear as the first or last signer, detailed as follows: Last Author (ROSADO MARIA, MARIA EUGENIA).

the author responsible for correspondence tasks has been ROSADO MARIA, MARIA EUGENIA.

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Awards linked to the item

The first and fourth authors have been supported by the Ministerio de Ciencia, Innovacion y Universidades, Spain, under Projects PID2021-126124NB-I00 and PID2024-156578NB-I00.
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