Dark energy weakens
There is Quanta Magazine post (see this) telling about the evidence, found by DESI collaboration, that dark energy is getting weaker .
In TGD, the new view of space-times as 4-D surfaces in H=M4×CP2, predicts the analogy of cosmological constant as well as its weakening. String tension characterizes the energy density of a magnetic monopole flux tube, a 3-D surface in H=M4×CP2. String tension contains a volume part (direct analog of Λ) and a K hler magnetic part and it is a matter of taste whether one identifies the entire string tension or only the volume contribution as counterpart of Λ. In the primordial cosmology (see this), cosmic string sheets have 2-D M4 projection and 2-D CP2 projection.
Cosmic strings are unstable against the thickening of their 2-D M4 projection, which means that the energy density is gradually reduced in a sequence of phase transitions as thickenings of the cosmic string so that they become monopole flux tubes and give rise to galaxies and stars. The energy of cosmic strings is transformed to ordinary particles. This process is the TGD analog of inflation. No inflaton fields are required.
The string tension is gradually reduced in these phase transitions and in this sense one could say that dark energy is weakened. For instance, for hadronic strings it is rather small as compared to the original value of string tension during the primordial phase dominated by cosmic strings, at the molecular level the string tension of cosmic strings is really small.
The primordial string dominated phase was followed by a transition to the radiation dominated cosmology and emergence of Einsteinian space-time with 4-D M4 projection so that general relativity and quantum field theory became good approximations explaining a lot of physics. Quantum field theory approximation cannot however explain the structures appearing in all scales and here monopole flux tubes are necessary.
See for instance the article About the recent TGD based view concerning cosmology and astrophysics or the chapter with the same title.
For a summary of earlier postings see Latest progress in TGD.
For the lists of articles (most of them published in journals founded by Huping Hu) and books about TGD see this.
Source: https://matpitka.blogspot.com/2025/03/dark-energy-weakens.html
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