For the first time, scientists are poised to detect ripples in space-time called gravitational waves—and Birmingham’s team is building the technology to catch them. These waves, predicted by Einstein, are created when black holes or neutron stars collide. Until now, almost all astronomy has relied on light or radio waves, which can be blocked or distorted. Gravitational waves pass through matter unhindered, offering a completely new way to see the universe. The team is also developing advanced detectors to pick up even weaker signals, which could reveal events currently invisible. This is fundamental science. There is no immediate practical application. But past fundamental research—like Einstein’s own work—led to technologies such as GPS, which relies on relativistic corrections to function. Understanding gravitational waves could one day underpin new navigation systems, ultra-precise sensors, or entirely unforeseen technologies. The group is also using supercomputer simulations to study how supermassive black holes power active galaxies, and how massive stars shape their surroundings through powerful winds. By combining observations across radio, optical, and X-ray wavelengths, they aim to clarify how these stars influence the galaxies they inhabit.
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Most of our knowledge about the Universe at large has been derived from what scientists refer to as "electromagnetic radiation" - ranging from radio waves through infrared radiation and light, to X-rays and gamma rays. This is about to change, since we are on the brink of the first detection of the ripples in space-time known as gravitational waves, which are predicted by Einstein's theory of General Relativity. The Birmingham Astrophysics and Space Research Group is playing a key role in these developments, and is preparing to use the signals from merging black holes and neutron stars to learn more about the evolution of stars, and to test our understanding of gravity itself. We are also developing the advanced technology which will be required to make future improvements in detecting gravitational waves, so that much weaker signals can be studied. The capabilities of more conventional instruments to probe the distant Universe, and the capacity of large computers to simulate the development of cosmic structures, continue to improve. We are bringing these developments together to advance our understanding of the role of "active galaxies", powered by supermassive black holes, and to study the impact these have on their cosmic environment. A hot topic in astrophysics is the effort to understand the mysterious "dark energy" which powers the accelerating expansion of the Universe. We plan to use clusters of galaxies as probes of the structure and expansion history of the Universe on the largest scales, to advance our understanding of the nature of dark energy. Within galaxies, the most massive stars have a major impact due to the very high power they radiate, and due to their powerful stellar winds. It is surprisingly difficult to estimate how much matter is streaming away from such stars in a wind, and we plan to combine computer modelling with observations at radio, optical and X-ray wavelengths to improve our understanding of just how big an impact massive stars have on their surroundings.
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