3 ms·
"Effect not big enough" implies a judgement about how much matter/antimatter was available to begin with... a tiny effect is entirely sufficient to produce the
by qubex 9y ago
"Effect not big enough" implies a judgement about how much matter/antimatter was available to begin with... a tiny effect is entirely sufficient to produce the observable universe if one purports to begin with a truly colossal initial amount of matter/antimatter.
- nimih 9y agoSince matter-antimatter annihilation produces radiation, what prevents us from estimating the size of the effect by measuring the background radiation of the universe and comparing it to the amount of observable matter?
- qubex 9y agoI presume the volume of the Universe. We can measure average density of residual radiation but getting the total value of energy requires multiplying by volume. Much of the universe's volume may be hidden behind a cosmological horizon (basically, the idea that as the universe's rate of expansion accelerates the greater the distance from us (Hubble's constant), eventually the rate of expansion exceeds the c and thus light from that part of the universe can never reach us, making it unobservable).
- frumiousirc 9y agoAre you referring to Hartz's statement? If so the statement refers to the measured effect in the experiment not the consequence of CP symmetry violation on the makeup of the universe. He means that if the CP phase angle is far enough away from zero or pi (his "luck") so that it will modify the amount of electron neutrino appearance beyond what is expected given the theta13 measurement from Daya Bay strongly enough that this deviation will be statistically significant. His claim is that, with this luck, even by 2026 the significance of the deviation will be only 3 sigma. This is level is conventionally not enough to claim discovery of non-zero CP phase. Around that same time, DUNE will have begun operations. That experiment is expected to reach the 5 sigma discovery level.