| Name: | Bhal Chandra Joshi |
| Affiliation: | National Centre for Radio Astrophysics, Pune / Indian Institute of Technology, Roorkee |
| Conference ID : | ASI2024_1132 |
| Title : | Ultra-long wavelength gravitational waves with the pulsar timing array experiments |
| Authors : | Bhal Chandra Joshi
on behalf of InPTA collaboration
|
| Authors Affiliation: | National Centre for Radio Astrophysics, Pune-411007,India
Department of Physics, Indian Institute of Technology, Roorkee, India |
| Mode of Presentation: | Invited |
| Abstract Category : | Plenary |
| Abstract : | Pulsar Timing Array experiments (PTAs), employing a collection
of rapidly rotating millisecond pulsar clocks, have found a
growing evidence for a stochastic gravitational wave background
(SGWB) last year. This isotropic SGWB is formed by an incoherent
superposition of ultra-long wavelength continuous gravitational waves
believed to originate by the superposition
of continuous gravitational waves emitted by an ensemble of
gravitational radiation dominated in-spiralling super-massive
black hole binary systems. PTAs have uncovered the
characteristic spectrum of the SGWB spatially correlated
across the radio pulsar pairs. A brief
discussion of these experiments, with a particular emphasis
on the Indo-Japnese experiment called the Indo-Japanese
Pulsar Timing Array (InPTA), is presented with a review
of our results jointly obtained with the European
pulsar timing array (EPTA) alongwith similar results from Parkes
pulsar timing array (PPTA), North American nanoHertz
Observatory for gravitational waves
(NANOgrav) and Chinese pulsar timing array (CPTA). After a
brief peep at the current ongoing work, the implications
of the current and future results of the PTAs on our
knowledge of the solar system, galaxy evolution and
cosmology are discussed towards the end of the presentation.
The talk concludes listing potential
inputs from these diverse areas of astronomy research
in unvieling the astrophysics as seen through this new
window of the gravitational wave messenger.
|
