Melting of scalar mesons and black-hole quasinormal modes in a holographic QCD model

Autor(es)

Mamani, Luis A. H. ^{[1, 2]} ; Miranda, Alex S. ^[2] ; Zanchin, Vilson T. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed ABC, Ctr Ciencias Nat & Humanas, Rua Santa Adelia 166, BR-09210170 Santo Andre, SP - Brazil

^[2] Univ Estadual Santa Cruz, Dept Ciencias Exatas & Tecnol, Lab Astrofis Teor & Observac, BR-45650000 Ilheus, BA - Brazil

• Tipo de documento: Artigo Científico
• Fonte: EUROPEAN PHYSICAL JOURNAL C; v. 79, n. 5 MAY 22 2019.
• Citações Web of Science: 1

Resumo

A holographic model for QCD is employed to investigate the effects of the gluon condensate on the spectrum and melting of scalar mesons. We find the evolution of the free energy density with the temperature, and the result shows that the temperature of the confinement/deconinement transition is sensitive to the gluon-condensate parameter. The spectral functions (SPFs) are also obtained and show a series of peaks in the low-temperature regime, indicating the presence of quasiparticle states associated to the mesons, while the number of peaks decreases with the increment of the temperature, characterizing the quasiparticle melting. In the dual gravitational description, the scalar mesons are identified with the black-hole quasinormal modes (QNMs). We obtain the spectrum of QNMs and the dispersion relations corresponding to the scalar-field perturbations of the gravitational background, and find their dependence with the gluon-condensate parameter. (AU)

• Processo FAPESP: 13/17642-5 - Aplicações da correspondência AdS/CFT
• Beneficiário: Luis Alex Huahuachampi Mamani
• Modalidade de apoio: Bolsas no Brasil - Doutorado