Café com Física

Evidence for NanoHertz Gravitational Waves at Pulsar Timing Arrays: the case for new physics and possible connections with QCD

by Ricardo Zambujal Ferreira (CFisUC, Departamento de Física, Universidade de Coimbra)

Sala de Conferências (Departamento de Física FCTUC)

Sala de Conferências

Departamento de Física FCTUC

Universidade de Coimbra

In recent years, different Pulsar Timing Arrays (PTA) observatories reported strong evidence for a common-spectrum process in their searches, and the data released last year strengthened the interpretation that the signal is caused by a stochastic gravitational wave (GW) background.
A common interpretation of the GW signal is that it originates from Supermassive Black Hole Binaries. In this talk, I will briefly review the evidence for the GWs and discuss an alternative interpretation that we recently proposed, based on new physics that is closely connected to QCD, and that fits the data as well as the more vanilla explanation.

Organized by

Paulo Brás, Paulo Silva, Jaime Silva