Instability of Cosmology with Quantum Corrections

In summary, a recent paper by Tawfik et al. has shown that the proposal of quantum corrections for the early Universe, which was previously interpreted as evading the big-bang singularity and determining an infinite age of the Universe, is actually unstable. This was based on a "perturbative instability" check and was further supported by other papers. This raises questions about the validity of the original proposal and calls for further examination.
  • #1
David Miller
4
0
A good year ago, quantum corrections have been proposed to the very early Universe. It was concluded that these quantum corrections contain a precise estimation for the cosmological constant and the so-called radiation term. The authors even have interpreted the latter as evading the big-bang singularity and determining an infinite age of the Universe. This was mentioned in science and social media for instance http://phys.org/news/2015-02-big-quantum-equation-universe.html

This proposal was sharply criticized in http://arxiv.org/pdf/1505.03070.pdf

Instead of struggling with the correctness of the given approach and to retry to rederive the mathematical equations as partly done in http://arxiv.org/pdf/1505.03070.pdf, Tawfik et al. wanted to check the so-called "perturbative instability", which based is on whether or not any added perturbation alters at a later time. The universe we live in and the one described by such world approach is apparently stable despite its accelerated expansion. Thus the claimed world model should absolve the
"stability check", http://arxiv.org/pdf/1603.03032.pdf and Physical Review D
https://journals.aps.org/prd/abstract/10.1103/PhysRevD.93.063526 show that the "Cosmology with quantum equation" is simply unstable.
 
  • #3
Thanks Admin! I ll reword the post
 
  • #4
The recent paper by Tawfik et al. entitled with "Perturbative Instability of Cosmology from Quantum Potential" https://journals.aps.org/prd/abstract/10.1103/PhysRevD.93.063526 shows that Ali and Das, "Cosmology from quantum potential," http://arxiv.org/abs/1404.3093 which was commented in https://www.physicsforums.com/threads/ali-and-das-cosmology-from-quantum-potential.797183/ describes an unstable Universe. The perturbative instability is nicely written in Tawfik et al.'s paper.

I'm not a quite familiar specialist on such "instabilities checks", but from a brief inspection it looks to me that the recent paper simply revises the earlier one. Should we now ignore "Cosmology from quantum potential," http://arxiv.org/abs/1404.3093?

Is this impression correct?
 

1. What is the instability of cosmology with quantum corrections?

The instability of cosmology with quantum corrections refers to the concept that the laws of quantum mechanics may cause fluctuations or changes in the structure and behavior of the universe on a cosmic scale. This is in contrast to classical cosmology, which assumes a stable and predictable universe.

2. How do quantum corrections affect cosmology?

Quantum corrections can potentially alter the way we understand and model the universe, as they introduce uncertainty and randomness into the behavior of particles and systems. This can lead to changes in the expansion rate of the universe, the formation of structures such as galaxies, and other fundamental aspects of cosmology.

3. What evidence suggests the presence of quantum corrections in cosmology?

There are several observations and theories that support the idea of quantum corrections in cosmology. For example, the presence of dark energy, which is thought to be responsible for the accelerating expansion of the universe, could be explained by quantum effects. Additionally, the existence of quantum fluctuations in the cosmic microwave background radiation also supports the presence of quantum corrections in the early universe.

4. How is the instability of cosmology with quantum corrections being studied?

Scientists are studying the instability of cosmology with quantum corrections through a combination of theoretical models, computer simulations, and observational data. They are also conducting experiments to test the predictions of quantum mechanics on a larger scale, such as with gravitational wave detectors.

5. What are the implications of the instability of cosmology with quantum corrections?

If quantum corrections are found to significantly affect the behavior of the universe, it could have major implications for our understanding of the cosmos and the fundamental laws of physics. It could also lead to new discoveries and theories that help us better explain the mysteries of the universe, such as dark energy and dark matter.

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