A Has a calculation of the vacuum energy density been done with strings?

JandeWandelaar
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The vacuum energy density of the vacuum, as calculated in standard QFT, shows a discrepancy of about $10^{120}$ with what we see. Has the value been calculated in string theory, which doesn't assume point-like particles?
The calculation of the vacuum energy density gives us a discrepancy with reality. There should be a mass equivalent of about $10^{96}$ kilograms. I'm wondering if the assumed point-like "structure" of particles could be the cause of this wrong value.

Since string theory doesn't assume a point-like structure, I asked myself if a calculation of the energy density with strings has been done.
 
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JandeWandelaar said:
The calculation of the vacuum energy density gives us a discrepancy with reality.

Nonsense. There is no such calculation. At best, there is an estimate, and not a very good one at that.

Starting threads by presenting incorrect statements as facts is, in general, not a good plan.
 
Why does the estimate differ so much with what we see? Is there an estimate in string theory? I could not find it. Only estimates in standard QFT.
 
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Vanadium 50 said:
Nonsense. There is no such calculation. At best, there is an estimate, and not a very good one at that.

Starting threads by presenting incorrect statements as facts is, in general, not a good plan.
BTW, do you know why the LaTex doesn't function? Is $10^{120}$ not right?
 
JandeWandelaar said:
BTW, do you know why the LaTex doesn't function? Is $10^{120}$ not right?
you got to put double $ at start and end. And then refresh the page.
 
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JandeWandelaar said:
BTW, do you know why the LaTex doesn't function? Is $10^{120}$ not right?

for LaTeX on the forum: https://www.physicsforums.com/help/latexhelp/

This is a summary of how the ##10^{120}## discrepancy calculation is done, it is a bit heuristic
https://www.cantorsparadise.com/the...iction-in-the-history-of-physics-5be09b309043
Calculating vacuum energy in various QFTs is a thing, there are several papers published on that matter. Here is one such article https://arxiv.org/abs/1302.5934
 
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Thanks dude (am I allowed...?). 😉
 
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Is this about the so called, ground state energy of the fields?
 
JandeWandelaar said:
Why does the estimate differ so much with what we see?
Nobody knows. This is an open area of research.

JandeWandelaar said:
Is there an estimate in string theory? I could not find it.
I'm not aware of one either.
 
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PeterDonis said:
Nobody knows. This is an open area of research.I'm not aware of one either.
Somehow I think $$10^{120}$$ and the cube of the Planck length, $$10^{-115}$$, are related.
 
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JandeWandelaar said:
Somehow I think $$10^{120}$$ and the cube of the Planck length, $$10^{-115}$$, are related.
Personal speculation of this kind is off limits here.
 
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The OP question has been answered. Thread closed.
 
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