Primordial Black Holes and Cosmological Phase Transitions Report ...

PBHs and Cosmological Phase Transitions 135
∆
0.6
0.5
0.4
0.3
0.2
0.1
x0.308 x0.6 x0.927
∆c1 ∆c0.7
∆c1 ∆c13
BH formation
BH formation
No BH formation
0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
x
Figure 59: The curve in the (x, δ) plane indicating which parameter values lead
to collapse to a BH, within the QCD Bag Model, in the case y −1 < x < 1
with δc =1/3–blue/pink region, and δc =0.7–pink region (note that, in both
cases, the BH formation region extends up to δ = 1). We show the values of x
corresponding to the cases presented in Figures 56 and 58.
Table 30: The values of δBC, δCE and δc1 for different values of x (y −1