JGRG27 Workshop
Gr@v members P. Cunha and C. Herdeiro were amongst the participants of the 27th workshop on General Relativity and Gravitation in Japan (JGRG 27). Herdeiro was one of the invited speakers.
Cosmology News & Events
A no-go theorem for exotic alternatives to black holes as LIGO/Virgo sources
Five of the ground-breaking gravitational wave detections by the LIGO/Virgo collaboration have been interpreted as black hole collisions forming a more massive black hole. It is hard to demonstrate conclusively that these objects are indeed black holes, and there is a lively debate on the intriguing possibility that other, more exotic alternatives could explain the observations. In an article published in Physical Review Letters, Gr@v members P.
Vacuum decay, black holes and the end of the universe
Speaker
Ian Moss, Newcastle University
Event date
Venue
GAP room
Event type
The Higgs vacuum is a metastable state with lifetime longer than the age of the universe, but the vacuum can be destabilised by microscopic black hole seeds. The nucleation process is a nice example of black hole thermodynamics.
Alexandre Pombo is now a Master
Alexandre Pombo successfully finished his Physics M.Sc. at Aveiro University, on October 10th 2017, by defending a thesis with title "Q-balls spectroscopy and construction of boson stars". This thesis was supervised by Gr@v researchers and examined by Prof. Yves Brihaye, from the University of Mons, Belgium. Well done Alexandre!
Helgi Rúnarsson Ph.D. exam
Helgi Rúnarsson successfully defended his PhD thesis "Kerr black holes with scalar and Proca hair". The exam took place at the University of Aveir, on October 9th 2017. The thesis was supervised by Gr@v members C. Herdeiro and E. Radu and former member J. C. Degollado, now at UNAM (Mexico). Congratulations Helgi!
X Black Holes Workshop
Event date
Venue
Auditório do Departamento de Ambiente e Ordenamento
Ends on
Event Website
Event type
Alexandre Pombo
Full Name: Alexandre M. Pombo
Position: PostDoc at CEICO
Degree: PhD in Physics
Email: pomboalexandremira@ua.pt
ORCID: 0000-0002-5815-2758
From Infinitely Large to Infinitely Small
Gr@v member António P. Morais gave a talk at Escola Secundária José Régio in Vila do Conde with title "Do Infinitamente Grande ao Infinitamente Pequeno - uma jornada pelas interações fundamentais na natureza". António was an invited speaker to participate in a sequence of seminars entitled "A Biblioteca convida...", and presented to 11th and 12th grade Science and Technology students the four fundamental interactions in nature and how have they shaped our Universe.
Chiral Magnetohydrodynamic Turbulence
Speaker
Natacha Leite (DESY, U. Hamburg)
Event date
Venue
GAP room
Event type
Abstract: I will present the influence of the chiral anomaly on the evolution of magnetohydrodynamics. In the early universe, before electroweak symmetry breaking, and in systems at high enough temperatures such that the electron mass can be ignored, the general description of a charged plasma needs to take into account the triangle anomaly. The interplay between turbulence and chiral magnetic effect can have important consequences on the evolution of magnetic fields, leading to the creation of maximally-helical fields from initially non-helical ones. Chiral effects can support a turbulent inverse cascade, causing a slower decrease of magnetic field with time and a faster growth of correlation length, when compared to the evolution predicted by the standard magnetohydrodynamical description. Using the weak anomaly approximation, specific solutions for the inverse cascade regime that show how chiral effects support it are derived.
5th UTQuest Workshop
Gr@v member Carlos Herdeiro was one of the invited speakers of the 5th UTQuest workshop, with the theme "Hidden Sector Physics and Cosmophysics", that took place at the Yukawa Insitute for Theoretical Physics, Kyoto University, Kyoto, Japan.