Baryon asymmetry from Barrow entropy: theoretical predictions and observational constraints

Understand

We investigate the generation of baryon asymmetry from the corrections brought about in the Friedman equations due to Barrow entropy.

• In particular, by applying the gravity-thermodynamics conjecture one obtains extra terms in the Friedmann equations that change the Hubble function evolution during the radiation-dominated epoch.
• Hence, even in the case of standard coupling between the Ricci scalar and baryon current they can lead to a non-zero baryon asymmetry.
• In order to match observations we find that the Barrow exponent should lie in the interval $0.005 \lesssim \Delta \lesssim 0.008$, which corresponds to a slight deviation from the standard Bekenstein-Hawking entropy.