Zero Active Mass in FRW cosmologies

In summary, there is a debate surrounding Fulvio Melia's argument for the necessity of "zero active mass" in FRW cosmologies. This argument states that the overall equation of state must be ##\rho+3p=0## at all times, including in the current universe. However, this claim has been deemed flawed by others, as evidenced by multiple papers that have not been peer-reviewed or published in a journal. Therefore, the overall consensus is that this argument is not widely accepted.
  • #1
jcap
170
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What do people think of Fulvio Melia's argument for the necessity of "zero active mass" in FRW cosmologies? (i.e. the overall equation of state must be ##\rho+3p=0## at all times)

Here is a link to an interesting lecture video:



Here is a recent paper:

https://arxiv.org/abs/1807.07587
 
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  • #2
jcap said:
What do people think of Fulvio Melia's argument for the necessity of "zero active mass" in FRW cosmologies? (i.e. the overall equation of state must be ##\rho+3p=0## at all times)

Since ##\rho + 3p = 0## is obviously false in the universe now, whatever argument he is making is flawed.

jcap said:
Here is a recent paper

The abstract of this paper contains several obvious errors and misunderstandings. I note that the paper has not been peer reviewed or published in a journal.
 
  • #4
jcap said:
A more relevant paper

Which still makes the same obviously false claim that ##\rho + 3p = 0##. This paper also has not been peer-reviewed or published in a journal.

The answer to your question is not going to change no matter how many papers by this author you find. Thread closed.
 

Related to Zero Active Mass in FRW cosmologies

1. What is Zero Active Mass in FRW cosmologies?

Zero Active Mass in FRW cosmologies refers to a theoretical concept in cosmology where the total mass of the universe is considered to be zero. This concept is based on the assumption that the universe is spatially flat and has a critical density, meaning that the expansion of the universe will eventually come to a stop.

2. How does Zero Active Mass in FRW cosmologies differ from the traditional understanding of mass in cosmology?

The traditional understanding of mass in cosmology is based on the presence of matter and energy in the universe. In this understanding, the total mass of the universe is not zero and can have a significant impact on the expansion and evolution of the universe. However, Zero Active Mass in FRW cosmologies challenges this understanding by suggesting that the universe can exist and evolve without any total mass.

3. What evidence supports the concept of Zero Active Mass in FRW cosmologies?

The concept of Zero Active Mass in FRW cosmologies is based on mathematical models and equations, such as the Friedmann-Lemaitre-Robertson-Walker (FRW) metric, which describe the expansion of the universe. These models have been supported by observational evidence, such as the cosmic microwave background radiation and the large-scale structure of the universe.

4. How does Zero Active Mass in FRW cosmologies impact our understanding of the universe?

If the concept of Zero Active Mass in FRW cosmologies is proven to be true, it would change our fundamental understanding of the universe. It would mean that the universe can exist and evolve without the need for matter and energy, which are essential components in our current understanding of cosmology. It could also have implications for our understanding of dark matter and dark energy, which are currently believed to make up a significant portion of the universe's mass.

5. Are there any critiques or challenges to the concept of Zero Active Mass in FRW cosmologies?

While the concept of Zero Active Mass in FRW cosmologies has gained some traction in the scientific community, it is still a highly debated topic. Some scientists have raised concerns about the assumptions and limitations of the mathematical models used to support this concept, and further research and evidence are needed to fully understand its implications for our understanding of the universe.

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