CC Problem Beyond the Standard Model

  • Thread starter lucas_
  • Start date
  • #1
413
22

Main Question or Discussion Point

Which of the following do you prefer as possible solution to the cosmological constant problem or why QFT computes vacuum energy density that is 120 magnitude more than from observational data? Sometimes I think the metric (1.a) needs to change, but on other days I think QFT needs to change (2.a).. the CC problem would indeed be directly relevant to search for physics beyond the standard model.

http://arxiv.org/pdf/hep-th/0012253v1.pdf

1. A modification of GR. The problem could be either


(a) ‘internal’ in the sense that a change is needed in the GR formalism itself (e.g. changing the role of the metric), or
(b) ‘external’ in the sense that GR is still considered effectively correct, but that it needs to be embedded in an extended framework to address the question (e.g. quantum cosmology).

2. A modification of QFT. Again, the problem could be either


(a) ‘internal’ in the sense that a change in, or a reinterpretation of, the QFT formalism which gives rise to the vacuum energy is needed (for instance through Schwinger’s source theory), or

(b) ‘external’ in the sense that QFT (the Standard Model) is considered effectively correct as a low energy theory, but needs to be embedded in an extended framework to address the question (e.g. supersymmetry).

3. The link between GR and QFT is problematic. Once more, we see at least two

ways in which this may be the case, either the problem is

(a) ‘internal’ in the sense that the link cannot even be discussed properly due to our limited understanding of the coupling between GR and QFT (e.g. QFT in curved spacetime, and back-reaction), or

(b) ‘external’ in the sense that we due to the limited understanding of the coupling between GR and QFT ought to postpone the problem until we have a theory in which the link is embedded in an extended framework for both GR and QFT since only in such a theory will the problem be completely well posed (e.g. string theory)
Schwinger’s source theory is that in the absence of matter and measurement settings, there are no quantum fields avoiding the 120 magnitude discrepancy, how many even consider this possibility?

Can you add others not mentioned above?
 

Answers and Replies

  • #2
413
22
In the Hierarchy Problem. It's related to mass too or why planck mass fluctuations don't make the higgs much heavier. In the Cosmological Constant problem, it is mass too coming from the quantum fluctuations that are 120 magnitude off to observations. They have in common mass from virtual fluctuations.. won't that give constrains to solutions to both? These are the most severe problems in physics today. What can you guys say about this.
 

Related Threads on CC Problem Beyond the Standard Model

  • Last Post
Replies
2
Views
2K
  • Last Post
6
Replies
148
Views
18K
  • Last Post
Replies
5
Views
4K
Replies
14
Views
4K
Replies
4
Views
3K
Replies
39
Views
9K
Replies
1
Views
2K
Replies
4
Views
2K
Replies
0
Views
709
Replies
7
Views
5K
Top