What is stochastic gravitational wave background?
Stochastic gravitational waves are the relic gravitational waves from the early evolution of the universe. Similar backgrounds could be produced by a combination of many simultaneous inspirals, bursts, or continuous signals from throughout the Universe.
Do gravitational waves have sound?
We can hear gravitational waves, in the same sense that sound waves travel through water, or seismic waves move through the earth. The difference is that sound waves vibrate through a medium, like water or soil. For gravitational waves, spacetime is the medium. It just takes the right instrument to hear them.
Do black holes produce gravitational waves?
The strongest gravitational waves are produced by cataclysmic events such as colliding black holes, supernovae (massive stars exploding at the end of their lifetimes), and colliding neutron stars. Note that gravitational waves themselves are invisible.
Which line frequency and harmonics noise peaks appear in the LIGO data?
The most prominent peaks Thermally excited mirror suspension “violin modes” at ~329.5 Hz and in the 335-350 Hz range, and harmonics. There is a “forest” of them due to the numerous mirror suspension wires in the LIGO interferometers. These are an unfortunate but inevitable part of the LIGO detector design.
Can we detect gravity waves?
Gravitational waves can be detected indirectly – by observing celestial phenomena caused by gravitational waves – or more directly by means of instruments such as the Earth-based LIGO or the planned space-based LISA instrument.
What is a gravity wave chirp?
The sound these gravitational waves would produce is a chirp sound (much like when increasing the pitch rapidly on a slide whistle) since the binary system’s orbital frequency is increasing (any increase in frequency corresponds to an increase in pitch). ( Listen)
Can LIGO detect dark matter?
LIGO, Virgo, and KAGRA were designed to search for gravitational waves from merging black holes and neutron stars, asymmetrically rotating pulsars, exploding stars, and combinations of all of these sources. But, these detectors are so sensitive that they could also observe dark matter that interacts directly with them.
What frequency can LIGO detect?
The Laser Interferometer Gravitational Wave Observatory (LIGO) consists of two widely separated 4 km laser interferometers designed to detect gravitational waves from distant astrophysical sources in the frequency range from 10 Hz to 10 kHz.
What is LIGO India project?
The Laser Interferometer Gravitational-Wave Observatory (LIGO) – India is a planned advanced gravitational-wave observatory to be located in India as part of the worldwide network, whose concept proposal is now under active consideration in India and the USA.
What is the astrophysical background for gravitational waves?
An astrophysical background produced by the confusion noise of many weak, independent, and unresolved astrophysical sources. For instance the astrophysical background from stellar mass binary black-hole mergers is expected to be a key source of the stochastic background for the current generation of ground based gravitational-wave detectors.
Which is the sensitive frequency band for gravitational waves?
The nature of source also depend on the sensitive frequency band of the signal. Current generation of ground based experiments like LIGO and Virgo are sensitive to gravitational-waves in the audio frequency band between approximately 10 Hz to 1000 Hz.
Are there any detectors that can detect gravitational waves?
LIGO and Virgo detectors have already detected individual gravitational-wave events from such black-hole mergers. However there would be a large population of such mergers which would not be individually resolvable which would produce a hum of random looking noise in the detectors.
Why are LIGO and Virgo sensitive to gravitational waves?
Current generation of ground based experiments like LIGO and Virgo are sensitive to gravitational-waves in the audio frequency band between approximately 10 Hz to 1000 Hz. In this band the most likely source of the stochastic background will be an astrophysical background from binary neutron-star and stellar mass binary black-hole mergers.