Cosmology is the study of the large scale structure of the Universe, as well as its dynamics. Our group has been involved in the study and development of cosmological models, in particular to explain the accelerated phases of the cosmological evolution, dubbed inflationary phases.
For our latest developments/activities in this area, please see the listing below.
Gravitational waves from warm inflation in the weak dissipative regime, O. Luongo, T. Mengoni, P. M. Sá; Phys. Dark Univ. 52 (2026) 102317; arXiv:2603.07662 [gr-qc].
Phantom cosmology with arbitrary potential: New accelerating scaling attractors, S. Halder, S. Pan, P. M. Sá, T. Saha; Phys. Lett. B 873 (2026) 140212, arXiv:2510.17765 [gr-qc].
Gravitational waves from two scalar fields unifying the dark sector with inflation, O. Luongo, T. Mengoni, P. M. Sá; Phys. Rev. D 113 (2026) 023541, arXiv:2509.21200 [gr-qc]
Gravitational echoes of lepton number symmetry breaking with light and ultralight Majorons, Andrea Addazi, Antonino Marciano, António P. Morais, Roman Pasechnik, João Viana, Hao Yang; JCAP 09 (2023) 026, 2304.02399 [hep-ph].
Gravitational waves from a scotogenic two-loop neutrino mass model, Cesar Bonilla, A. E. Carcamo Hernandez, João Gonçalves, Vishnudath K. N., António P. Morais, Roman Pasechnik; Phys.Rev.D 109 (2024) 9, 095022, 2305.01964 [hep-ph]
We got together on May 20th 2026 at Etevaldo's favourite restaurant in Aveiro (O Telheiro), to celebrate his 4.5 years in Gr@v. In the same day we had an excellent seminar from Hryhorii Ovcharenko, visiting from Prague. Etevaldo is now starting a post-doctoral position in Brazil. Many thanks, Etevaldo, for being with us. See you soon!
Geometric Cosmology—and in particular Geometric Inflation (GI)—provides a higher-curvature mechanism capable of producing an accelerated expansion in the early Universe without invoking an inflaton in its minimal realization.
In early May 2026 we received the visits of our collaborators Nico Sanchis Gual, Isa Cordero, Gabriele Palloni, Claudio Lazarte (Valencia, Spain), members of the NewFunFiCO network, as well as Carolina Benone (UFPA, Brazil) and Carlos Joaquin (UNAM, Mexico), who joined us to celebrate the successful Ph.D. exam of Etevaldo Costa.
Etevaldo Costa successfully defended his Ph.D. thesis with title "Bosonic exotic compact objects: construction and physical properties". The thesis was supervised by C. Herdeiro and E. Radu and the committee included Eric Gourgoulhon, Daniela Doneva and Carolina Benone as examiners. Congratulations Etevaldo!
In April 2026 we received the visits of Maryem Jemri (Rabat) and Justin Feng (Prague). Thank you for your seminars and the great scientific interactions!