Spectral properties of generalized Paley graphs

Autores
Podesta, Ricardo Alberto; Videla Guzman, Denis Eduardo
Año de publicación
2025
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
We study the spectrum of generalized Paley graphs Γ(k, q) = Cay(Fq, Rk),undirected or not, with Rk = {xk: x ∈ F∗q} where q = pm with p primeand k | q − 1. We first show that the eigenvalues of Γ(k, q) are givenby the Gaussian periods η(k,q)i with 0 ≤ i ≤ k − 1. Then, we explicitlycompute the spectrum of Γ(k, q) with 1 ≤ k ≤ 4 and of Γ(5, q) for p ≡ 1(mod 5) and 5 | m. Also, we characterize those GP-graphs having integral spectrum, showing that Γ(k, q) is integral if and only if p divides(q−1)/(p−1). Next, we focus on the family of semiprimitive GP-graphs.We show that they are integral strongly regular graphs (of pseudo-Latinsquare type). Finally, we characterize all integral Ramanujan graphsΓ(k, q) with 1 ≤ k ≤ 4 or where (k, q) is a semiprimitive pair.
Fil: Podesta, Ricardo Alberto. Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía y Física; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Centro de Investigación y Estudios de Matemática. Universidad Nacional de Córdoba. Centro de Investigación y Estudios de Matemática; Argentina
Fil: Videla Guzman, Denis Eduardo. Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía y Física; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Centro de Investigación y Estudios de Matemática. Universidad Nacional de Córdoba. Centro de Investigación y Estudios de Matemática; Argentina
Materia
GENERALIZED PALEY GRAPHS
SPECTRUM
GAUSS PERIODS
RAMANUJAN
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nd/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/286959

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spelling Spectral properties of generalized Paley graphsPodesta, Ricardo AlbertoVidela Guzman, Denis EduardoGENERALIZED PALEY GRAPHSSPECTRUMGAUSS PERIODSRAMANUJANhttps://purl.org/becyt/ford/1.1https://purl.org/becyt/ford/1We study the spectrum of generalized Paley graphs Γ(k, q) = Cay(Fq, Rk),undirected or not, with Rk = {xk: x ∈ F∗q} where q = pm with p primeand k | q − 1. We first show that the eigenvalues of Γ(k, q) are givenby the Gaussian periods η(k,q)i with 0 ≤ i ≤ k − 1. Then, we explicitlycompute the spectrum of Γ(k, q) with 1 ≤ k ≤ 4 and of Γ(5, q) for p ≡ 1(mod 5) and 5 | m. Also, we characterize those GP-graphs having integral spectrum, showing that Γ(k, q) is integral if and only if p divides(q−1)/(p−1). Next, we focus on the family of semiprimitive GP-graphs.We show that they are integral strongly regular graphs (of pseudo-Latinsquare type). Finally, we characterize all integral Ramanujan graphsΓ(k, q) with 1 ≤ k ≤ 4 or where (k, q) is a semiprimitive pair.Fil: Podesta, Ricardo Alberto. Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía y Física; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Centro de Investigación y Estudios de Matemática. Universidad Nacional de Córdoba. Centro de Investigación y Estudios de Matemática; ArgentinaFil: Videla Guzman, Denis Eduardo. Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía y Física; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Centro de Investigación y Estudios de Matemática. Universidad Nacional de Córdoba. Centro de Investigación y Estudios de Matemática; ArgentinaThe University of Queensland2025-03info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/286959Podesta, Ricardo Alberto; Videla Guzman, Denis Eduardo; Spectral properties of generalized Paley graphs; The University of Queensland; Australasian Journal of Combiantorics; 91; 3; 3-2025; 326-3652202-35182202-3518CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://ajc.maths.uq.edu.au/pdf/91/ajc_v91_p326.pdfinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nd/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2026-08-25T14:39:43Zoai:ri.conicet.gov.ar:11336/286959instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982026-08-25 14:39:44.096CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Spectral properties of generalized Paley graphs
title Spectral properties of generalized Paley graphs
spellingShingle Spectral properties of generalized Paley graphs
Podesta, Ricardo Alberto
GENERALIZED PALEY GRAPHS
SPECTRUM
GAUSS PERIODS
RAMANUJAN
title_short Spectral properties of generalized Paley graphs
title_full Spectral properties of generalized Paley graphs
title_fullStr Spectral properties of generalized Paley graphs
title_full_unstemmed Spectral properties of generalized Paley graphs
title_sort Spectral properties of generalized Paley graphs
dc.creator.none.fl_str_mv Podesta, Ricardo Alberto
Videla Guzman, Denis Eduardo
author Podesta, Ricardo Alberto
author_facet Podesta, Ricardo Alberto
Videla Guzman, Denis Eduardo
author_role author
author2 Videla Guzman, Denis Eduardo
author2_role author
dc.subject.none.fl_str_mv GENERALIZED PALEY GRAPHS
SPECTRUM
GAUSS PERIODS
RAMANUJAN
topic GENERALIZED PALEY GRAPHS
SPECTRUM
GAUSS PERIODS
RAMANUJAN
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.1
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv We study the spectrum of generalized Paley graphs Γ(k, q) = Cay(Fq, Rk),undirected or not, with Rk = {xk: x ∈ F∗q} where q = pm with p primeand k | q − 1. We first show that the eigenvalues of Γ(k, q) are givenby the Gaussian periods η(k,q)i with 0 ≤ i ≤ k − 1. Then, we explicitlycompute the spectrum of Γ(k, q) with 1 ≤ k ≤ 4 and of Γ(5, q) for p ≡ 1(mod 5) and 5 | m. Also, we characterize those GP-graphs having integral spectrum, showing that Γ(k, q) is integral if and only if p divides(q−1)/(p−1). Next, we focus on the family of semiprimitive GP-graphs.We show that they are integral strongly regular graphs (of pseudo-Latinsquare type). Finally, we characterize all integral Ramanujan graphsΓ(k, q) with 1 ≤ k ≤ 4 or where (k, q) is a semiprimitive pair.
Fil: Podesta, Ricardo Alberto. Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía y Física; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Centro de Investigación y Estudios de Matemática. Universidad Nacional de Córdoba. Centro de Investigación y Estudios de Matemática; Argentina
Fil: Videla Guzman, Denis Eduardo. Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía y Física; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Centro de Investigación y Estudios de Matemática. Universidad Nacional de Córdoba. Centro de Investigación y Estudios de Matemática; Argentina
description We study the spectrum of generalized Paley graphs Γ(k, q) = Cay(Fq, Rk),undirected or not, with Rk = {xk: x ∈ F∗q} where q = pm with p primeand k | q − 1. We first show that the eigenvalues of Γ(k, q) are givenby the Gaussian periods η(k,q)i with 0 ≤ i ≤ k − 1. Then, we explicitlycompute the spectrum of Γ(k, q) with 1 ≤ k ≤ 4 and of Γ(5, q) for p ≡ 1(mod 5) and 5 | m. Also, we characterize those GP-graphs having integral spectrum, showing that Γ(k, q) is integral if and only if p divides(q−1)/(p−1). Next, we focus on the family of semiprimitive GP-graphs.We show that they are integral strongly regular graphs (of pseudo-Latinsquare type). Finally, we characterize all integral Ramanujan graphsΓ(k, q) with 1 ≤ k ≤ 4 or where (k, q) is a semiprimitive pair.
publishDate 2025
dc.date.none.fl_str_mv 2025-03
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/286959
Podesta, Ricardo Alberto; Videla Guzman, Denis Eduardo; Spectral properties of generalized Paley graphs; The University of Queensland; Australasian Journal of Combiantorics; 91; 3; 3-2025; 326-365
2202-3518
2202-3518
CONICET Digital
CONICET
url http://hdl.handle.net/11336/286959
identifier_str_mv Podesta, Ricardo Alberto; Videla Guzman, Denis Eduardo; Spectral properties of generalized Paley graphs; The University of Queensland; Australasian Journal of Combiantorics; 91; 3; 3-2025; 326-365
2202-3518
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/https://ajc.maths.uq.edu.au/pdf/91/ajc_v91_p326.pdf
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nd/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nd/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
application/pdf
dc.publisher.none.fl_str_mv The University of Queensland
publisher.none.fl_str_mv The University of Queensland
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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score 13.265058