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Dhurandhar, Sanjeev
- Cosmic Sirens:Discovery of Gravitational Waves and their Impact on Astrophysics and Fundamental Physics
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Authors
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1 Inter-University Centre for Astronomy and Astrophysics, Pune 411 007, IN
2 Institute for Gravitation and Cosmos, Department of Physics, Penn State University, PA 16802, US
1 Inter-University Centre for Astronomy and Astrophysics, Pune 411 007, IN
2 Institute for Gravitation and Cosmos, Department of Physics, Penn State University, PA 16802, US
Source
Current Science, Vol 113, No 04 (2017), Pagination: 663-671Abstract
On 14 September 2015, the twin detectors belonging to the Laser Interferometer Gravitational Wave Observatory (LIGO) made a triple discovery: the first direct detection of gravitational waves (GWs), first observation of formation of a black hole and first observation of a binary black hole. Since then LIGO has reported two other events and a marginal candidate. These discoveries have heralded a new era in observational astronomy. They will help us in exploring extremes of astrophysics and gravity. GWs are our best chance of getting an idea of what went on a small fraction of a second after the big bang, even if that takes many more decades. With LIGO's discoveries we hope to solve many puzzles in astronomy and fundamental physics, but GWs are guaranteed to show up objects and phenomena never imagined before.Keywords
Cosmic Sirens, Gravitational Waves, Coalescing Compact Binaries, General Relativity.Full Text
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- Hidden Treasures of the Past
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PDF Views:66
Authors
Affiliations
1 Inter-University Centre for Astronomy and Astrophysics, Pune 400 007, IN
1 Inter-University Centre for Astronomy and Astrophysics, Pune 400 007, IN
Source
Current Science, Vol 120, No 6 (2021), Pagination: 1107-1112Abstract
In a space of four years, three Nobel Prizes in physics have been awarded in area of relativity, relativistic astrophysics and cosmology. This note will limit itself to Nobel Prizes in 2017 and 2020 to which India has made significant contributions in the past. The 2020 Nobel Prize in Physics was shared among Roger Penrose, Andrea Ghez and Reinhard Genzel. Penrose received the prize for establishing that black holes are a robust prediction of general relativity. The 2017 Nobel Prize went to Rainer Weiss, Kip Thorne and Barry Barish for decisive contributions to the LIGO detector and the observation of gravitational waves. From India there were significant contributions to these discoveries towards the understanding of black holes, formation of singularities and direct detection of gravitational waves. This note describes and also highlights these contributions.Full Text
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