Acceleration of expansion of Universe not that fast?

In summary, there is a new discussion about the measurements of the accelerating expansion of the Universe. It is believed that the acceleration may not be as fast as originally thought, and there are some concerns about the reliability of Ia supernovae in these measurements. The paper being referenced discusses the changing fractions of type Ia supernova NUV-optical subclasses at different redshifts and how that affects distance estimates. It is important to consider the source and any potential biases when evaluating these claims.
  • #1
SpiderET
82
4
There is some surprising twist regarding measurements of accelerating expansion of Universe. Maybe it is not accelerating that fast as previously predicted. It seems that there is something questionable about Ia supernovae.

What do you think about it? Is this real game changer or some minor glitch in data?

http://phys.org/news/2015-04-universe-fast.html
 
Astronomy news on Phys.org
  • #3
Consider the source. Certain authors have certain prejudices about cosmological interpretations. That is not necessarily a bad thing, but, it provides a reference point. I think you should not take them more seriously than the source of claims contested without equally firm observational backing - which is often the main reason such papers are viewed as controversial, or ignored by mainstream scientists.
 

1. Why is the acceleration of the expansion of the universe not as fast as predicted?

The acceleration of the expansion of the universe is not as fast as predicted because of the presence of dark energy. Dark energy is a hypothetical form of energy that is believed to make up about 70% of the total energy in the universe. It has a repulsive effect on matter, causing the expansion of the universe to accelerate. This effect is not fully understood and is still being studied by scientists.

2. What is dark energy and how does it affect the acceleration of the universe?

Dark energy is a hypothetical form of energy that is believed to make up about 70% of the total energy in the universe. It has a repulsive effect on matter, causing the expansion of the universe to accelerate. This effect is not fully understood and is still being studied by scientists.

3. How do scientists measure the acceleration of the expansion of the universe?

The acceleration of the expansion of the universe is measured using a variety of methods, including observations of supernovae, the cosmic microwave background radiation, and the distribution of galaxies. These methods all provide evidence for the existence of dark energy and its effect on the acceleration of the universe.

4. Has the acceleration of the expansion of the universe always been the same?

No, the acceleration of the expansion of the universe has not always been the same. In fact, it was previously thought that the expansion of the universe was slowing down due to the gravitational pull of matter. However, observations in the late 1990s showed that the expansion is actually accelerating, which led to the discovery of dark energy.

5. Could the acceleration of the expansion of the universe change in the future?

It is possible that the acceleration of the expansion of the universe could change in the future. This depends on the nature of dark energy and how it evolves over time. Some theories suggest that the acceleration could eventually slow down or even reverse, resulting in a "big crunch" where the universe collapses back in on itself. However, more research is needed to fully understand the behavior of dark energy and its effects on the expansion of the universe.

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