Primordial Black Holes and Cosmological Phase Transitions Report ...

PBHs and Cosmological Phase Transitions 187
log 10Βtk
0
-20
-40
-60
-80
n1.56, log 10t1s1
-5 -4 -3 -2 -1 0 1
log 10 tk
1 s
Figure 102: The fraction of the universe going into PBHs in a universe with
a running–tilt power spectrum when n+ =1.56 and t+ = 10 −1 s. The dark
curve represents the radiation contribution and the cyan curve (on the right)
represents the aditional contribution from the electron–positron annihilation
epoch. In this case we have also possible contributions from the QCD phase
transition: Bag Model (blue curve on the left), Lattice Fit (in magenta), and
Crossover (in green). Also shown (top of figure, in maroon) is the observational
limit.
log 10Βtk
0
-20
-40
-60
-80
n1.54, log 10t1s2
-6 -5 -4 -3 -2 -1 0 1
log10 tk
1 s
Figure 103: The fraction of the universe going into PBHs in a universe with a
running–tilt power spectrum when n+ =1.54 and t+ = 10 −2 s. In this case the
QCD Bag Model and the QCD Lattice Fit are excluded due to observational
constraints (for more details see Figure 102).