Two questions about SUSY [Greene's book]

[Golfer]

Greene in "The Fabric of the Cosmos" discusses supersymmetry. On pages 264-5, he states:"...before the Higgs ocean formed, not only did all force particles have identical masses - zero - but the photons and W and Z particles were identical in essentially every other way also as well...At high enough temperatures, that is, the Higgs ocean evaporates; as it does, the disctinction between the weak and electromagnetic forces evaporates, too." My first question is: If the temperature is high enough, will the distinction between gravity and the other forces also evaporate?

On page 355, he states:"...Ramond's research...revealed a perfect balance - a novel symmetry - between the vibrational patterns with different spins in the modified string theory. These researchers found that the new vibrational patterns arose in pairs whose spin values differed by half a unit. For every vibrational pattern with spin-1/2, there was an associated vibrational pattern with spin-0. For every vibrational pattern of spin-1, there was an associated vibrational pattern of spin-1/2, and so on." My second question is: The graviton is presumed to have a vibrational pattern with spin-2. Has the associated vibrational pattern with spin-3/2 been derived from string theory?

 

[BenTheMan]

If the temperature is high enough, will the distinction between gravity and the other forces also evaporate?

Yes, I think if you believe in unification then this is the correct picture.

The graviton is presumed to have a vibrational pattern with spin-2. Has the associated vibrational pattern with spin-3/2 been derived from string theory?

Yes---string theory contains the spin-3/2 particle, called the gravitino.

 

[Entropia]

I find these questions about supersymmetry and the potential implications for the fundamental forces of nature to be very intriguing. To address the first question, the idea of supersymmetry is based on the concept that for every known particle, there exists a "superpartner" particle with a different spin. This symmetry is believed to be broken at low energies, resulting in the different masses and properties of the particles we observe. However, at high enough temperatures, it is possible that this symmetry could be restored, leading to a merging of the weak and electromagnetic forces. This does not necessarily mean that the distinction between gravity and the other forces would also disappear, as the interactions and properties of gravity are fundamentally different from those of the other forces. Further research and experimentation are needed to fully understand the implications of supersymmetry at high temperatures.

Regarding the second question, the existence of a spin-3/2 gravitino as a superpartner to the graviton has been proposed in supersymmetric theories. However, it is important to note that these theories are still highly theoretical and have not yet been experimentally confirmed. The discovery of the graviton itself is also still a subject of ongoing research and debate. Therefore, the associated vibrational pattern with spin-3/2 has not yet been derived from string theory, but it remains a possibility that requires further investigation. Overall, the concept of supersymmetry and its potential implications for the fundamental forces of nature continue to be an active area of research in the scientific community.