- #1

- 120

- 0

For more on thermal SUSY: A. Das, "Supersymmetry and finite temperature"

- Thread starter crackjack
- Start date

- #1

- 120

- 0

For more on thermal SUSY: A. Das, "Supersymmetry and finite temperature"

- #2

- 453

- 15

I know nothing about thermal SUSY, but I don't except anyone makes this assumption. The usually assumption as I understand it is the reverse, that SUSY is preserved at high energy and spontaneously broken at low energy. Since the article you cite is from 1989 and people still study SUSY, I can only guess that their conclusion that "supersymmetry is spontaneously broken at finite temperature independent of whether supersymmetry is broken at zero temperature or not" is not as damning as it sounds... perhaps it doesn't really matter if SUSY ever actually existed in the universe? Perhaps it could still help with the hierarchy problem etc regardless of whether it was an exact symmetry of the early universe.ie. how valid is the assumption that temperature remains zero up until the point that the energy in the initial universe falls below the SUSY breaking energy scale

But yes I too would be interested to hear more on this, if someone here knows it.

- #3

- 120

- 0

I too think, for the same reason (that people are still studying SUSY), thermal effects probably dont upset the advantages of SUSY much. The section above that paper's conclusion heuristically discusses how the goldstino from thermal breaking of SUSY mixes with the goldstino from the usual SUSY breaking (at zero-temperature).Since the article you cite is from 1989 and people still study SUSY, I can only guess that their conclusion that "supersymmetry is spontaneously broken at finite temperature independent of whether supersymmetry is broken at zero temperature or not" is not as damning as it sounds... perhaps it doesn't really matter if SUSY ever actually existed in the universe? Perhaps it could still help with the hierarchy problem etc regardless of whether it was an exact symmetry of the early universe.

I saw a recent paper on this - http://arxiv.org/abs/1206.2958 - which talks (in the two paragraphs preceding acknowledgements) about possible cosmological implications of this mixing.

But it means that unbroken SUSY could never really have existed anytime in our universe's past.

- #4

- 11,224

- 3,887

Bose-Einstein and Fermi-Dirac distributions are different at any (including zero) given temperature, which is the PHYSICAL reason why SUSY may seem "broken" in thermal field theory. The different boundary conditions is only a convenient mathematical tool to describe this physical fact. But the SUSY is still there, even at a non-zero temperature, in the sense that the numbers of bosonic and fermionic degrees of freedom are equal. So there is no reason to expect that temperature remains zero.

For more on thermal SUSY: A. Das, "Supersymmetry and finite temperature"

- #5

- 120

- 0

You should read that review paper I posted above. Under non-zero temperatures, SUSY is always (spontaneously) broken, along with a goldstino associated with this breaking. But yes, since this is spontaneous breaking, the symmetry itself is not explicitly broken.Bose-Einstein and Fermi-Dirac distributions are different at any (including zero) given temperature, which is the PHYSICAL reason why SUSY may seem "broken" in thermal field theory. The different boundary conditions is only a convenient mathematical tool to describe this physical fact. But the SUSY is still there, even at a non-zero temperature, in the sense that the numbers of bosonic and fermionic degrees of freedom are equal. So there is no reason to expect that temperature remains zero.

- Last Post

- Replies
- 2

- Views
- 2K

- Replies
- 0

- Views
- 1K

- Replies
- 4

- Views
- 3K

- Replies
- 12

- Views
- 4K

- Replies
- 9

- Views
- 1K

- Last Post

- Replies
- 7

- Views
- 1K

- Last Post

- Replies
- 3

- Views
- 2K

- Last Post

- Replies
- 0

- Views
- 1K

- Last Post

- Replies
- 6

- Views
- 5K

- Replies
- 11

- Views
- 1K