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The Importance of Birefringence in Dark Energy
There is a claim out there that you can maybe see this birefringence in the known data that we have right now on the cosmic microwave background polarization. It's not yet to the level of statistical significance, so I'm being very, very cautious about it. The simplest explanation for the dark energy is just that it's a cosmological constant. So be very, very careful when people say we know nothing about what the darkEnergy is.