Active galaxies point to new physics of cosmic expansion

In summary, active galaxies play a crucial role in our understanding of the universe's expansion. They emit large amounts of radiation and have high velocities, indicating that they are powered by supermassive black holes. This behavior provides insights into the underlying physics of cosmic expansion, which is currently understood to be driven by dark energy. By studying active galaxies, scientists can gather data on the expansion rate and the effects of dark energy. While the current explanation involves black holes, other theories, such as modifications to gravity, are also being explored. Overall, studying active galaxies contributes to our understanding of fundamental principles and can lead to new discoveries in our understanding of the cosmos.
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  • #2
wolram said:
can dark energy vary over the history of the universe?

So far the mainstream belief is that it doesn't. But it's still an open area of research, as the article you linked to shows. Since it's an open area of research, a final answer is not known.
 
  • #3
The OP question has been answered. Thread closed.
 

FAQ: Active galaxies point to new physics of cosmic expansion

1. What are active galaxies?

Active galaxies are galaxies that emit unusually large amounts of energy, particularly in the form of radiation and jets of particles. This energy is thought to come from supermassive black holes at the center of these galaxies.

2. How do active galaxies point to new physics of cosmic expansion?

Active galaxies have been observed to have redshifts, which is a measure of how much the light from an object has been stretched to longer wavelengths. This redshift is thought to be caused by the expansion of the universe. However, recent studies have shown that the redshift of active galaxies may not be solely due to cosmic expansion, indicating the need for new physics to explain this phenomenon.

3. What is the significance of studying active galaxies?

Studying active galaxies allows scientists to better understand the processes and mechanisms that govern the evolution of galaxies and the universe as a whole. It also provides insights into the properties of black holes and their role in shaping the universe.

4. How do scientists study active galaxies?

Scientists use a variety of tools and techniques to study active galaxies, including telescopes that can detect different types of radiation, such as X-rays and radio waves. They also use computer simulations and mathematical models to understand the physical processes at work in these galaxies.

5. What are some potential implications of the new physics of cosmic expansion?

If the new physics of cosmic expansion is confirmed by further studies, it could have significant implications for our understanding of the universe and its evolution. It could also lead to new insights into the nature of dark energy, which is thought to be responsible for the accelerating expansion of the universe.

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