Valeria Ferrari - Academia.edu (original) (raw)

Uploads

Papers by Valeria Ferrari

The Fourteenth Marcel Grossmann Meeting, 2017

Classical and Quantum Gravity, 2019

Classical and Quantum Gravity, 2018

Journal of Cosmology and Astroparticle Physics, 2016

Bulletin of the Astronomical Society of India, May 9, 2011

arXiv (Cornell University), Jan 16, 2002

We study the gravitational wave emission from the first stars which are assumed to be Very Massiv... more We study the gravitational wave emission from the first stars which are assumed to be Very Massive Objects (VMOs). We take into account various feedback (both radiative and stellar) effects regulating the collapse of objects in the early universe and thus derive the VMO initial mass function and formation rate. If the final fate of VMOs is to collapse, leaving very massive black hole remnants, then the gravitational waves emitted during each collapse would be seen as a stochastic background. The predicted spectral strain amplitude in a critical density Cold Dark Matter universe peaks in the frequency range \approx 5 \times 10^{-4}-5 \times 10^{-3} Hz where it has a value in the range \approx 10^{-20}-10^{-19} Hz^{-1/2}, and might be detected by LISA. The expected emission rate is roughly 4000 events/yr, resulting in a stationary, discrete sequence of bursts, i.e. a shot--noise signal.

International Journal of Modern Physics D, 2010

Coalescing black hole–neutron star binaries have been invoked as possible progenitors of short ga... more Coalescing black hole–neutron star binaries have been invoked as possible progenitors of short gamma-ray bursts and are also among the most promising gravitational wave sources to be detected by ground-based laser interferometers. When the star is disrupted by tidal interactions before reaching the innermost stable circular orbit, the gravitational wave signal emitted by the system is expected to exhibit a cutoff frequency which is a distinctive feature of the waveform. We evaluate this frequency for several equations of state, describing the matter inside the neutron star, and combinations of the binary parameters. We show that, if this frequency will be found in a detected gravitational wave, it will provide valuable information on the behavior of matter in the stellar core.