4 papers
The unavoidable de Sitter fate of a scale-invariant Universe
Chiara Cecchini, Massimiliano Rinaldi
We consider a very general scale-invariant scalar-tensor theory of gravity and its flat cosmological solutions. We show that any stable configuration with non-degenerate gravitatio…
Are PTA measurements sensitive to gravitational wave non-Gaussianities?
Chiara Cecchini, Jonas El Gammal, Gabriele Franciolini +1
Observing non-Gaussianities in the timing residuals of Pulsar Timing Arrays (PTAs) has recently attracted attention as a potential discriminator between astrophysical and cosmologi…
Forecasting Constraints on SIGW with Future Pulsar Timing Array Observations
Chiara Cecchini, Gabriele Franciolini, Mauro Pieroni
Pulsar Timing Arrays are playing a crucial role in the ongoing gravitational wave astronomy revolution. The current evidence for a stochastic gravitational wave background (SGWB) a…
Tracing cosmic stretch marks: probing scale invariance in the early Universe
Mariaveronica De Angelis, Chiara Cecchini, Massimiliano Rinaldi
This paper investigates a scale-invariant inflationary model characterized by a scalar field non-minimally coupled to gravity and a curvature term quadratic in the Ricci scalar. Th…