"The search for gravitational waves"
Relatore: Massimo Cerdonio- INFN Section and Department of Physics, University of Padua, Italy
Aula Newton, Dipartimento di Fisica
20 Settembre 2006 ore 11.30
|Gravitational waves are still eluding detection: we are still blind to the direct messages sent out and carried
by one of the fundamental forces of Nature, just when
it is so strong to exploit the full physics of GR, as
in processes involving black-holes, and when it
overcomes in strength all the other fundamental interactions, as in matter at extreme densities,
as neutron stars.
Presently the future of the research field looks
The resonant mass “bar” detectors AURIGA, EXPLORER
and NAUTILUS in Europe, ALLEGRO in USA and NIOBE in Australia, have been operated for 4 years as a network, giving upper limits to the yearly rate of violent gw
events in the Galaxy. Now a 2300 kg resonant bar,
at 4 K as AURIGA, is sensitive to a few hundred quanta
of vibration and has a band 100 Hz wide around 950 Hz, enough, according to recent models, to detect the
vibrations induced by gravitational waves from proto
neutron star in Supernova core collapses in the
A first generation of km baseline interferometric
detectors, GEO 0.6 km and VIRGO 3km in Europe, two
4 km LIGO and one 2km LIGO in USA, and TAMA 0.3 km
in Japan, is coming to operation, with much wider
bands and higher sensitivities. They will make for
a global network, which, as it is commonly accepted,
after a substantial upgrade in the early 2010s,
will start the “observatory phase” much waited for.
DUAL acoustic detectors are under study to get
best sensitivities in the kHz frequency range, complementary to such upgrade interferometers,
to look specifically to the merging and the
vibrations of neutron stars and black-holes.