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Primordial Black Holes and Cosmological Phase Transitions Report ...

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PBHs <strong>and</strong> <strong>Cosmological</strong> <strong>Phase</strong> <strong>Transitions</strong> 105<br />

Table 24: The width of the cosmological electron–positron annihilation in terms<br />

of temperature as a function of the parameter ∆T (cf. equation 193) when<br />

Tc = 1 MeV. T1 represents the temperature when the sound speed gets less<br />

than 99% of its ‘background’ value 1/3 <strong>and</strong> T2 represents the temperature when<br />

the sound speed reaches, once again, 99% of 1/3 (T2

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