Constraints on Kaniadakis Cosmology from Starobinsky Inflation and Primordial Tensor Perturbations

TL;DR

This paper explores how Kaniadakis statistics modify horizon entropy and impact early Universe inflation, primordial gravitational waves, and cosmological observations, providing new constraints on the model.

Contribution

It introduces a generalized entropic cosmology based on Kaniadakis statistics and analyzes its effects on inflation and primordial tensor perturbations.

Findings

Kaniadakis entropy modifies Friedmann dynamics and inflationary predictions.

The model predicts deviations in the primordial gravitational wave spectrum.

Observational data constrain the Kaniadakis parameter tightly.

Abstract

We investigate a generalized entropic cosmology obtained by applying the gravity-thermodynamics conjecture to the Universe horizon using Kaniadakis statistics, namely a relativistic extension of the standard Boltzmann--Gibbs formalism. The resulting deformation of the horizon entropy naturally modifies the Friedmann dynamics and provides a phenomenologically consistent extension of the $\Lambda$CDM paradigm. Within this framework, we explore the implications of the modified cosmological dynamics for the physics of the early Universe, focusing in particular on primordial gravitational waves (PGWs) and slow-roll inflation in a Starobinsky-like scenario. We show that the generalized entropic corrections simultaneously affect the evolution of tensor perturbations and the inflationary slow-roll dynamics, inducing characteristic deviations in the PGW spectrum as well as nontrivial corrections to the main inflationary observables. By confronting the theoretical predictions with the latest Planck and BICEP/Keck observations, we derive stringent constraints on the Kaniadakis parameter and assess the observational viability of the model. Our results establish a direct connection between generalized horizon thermodynamics and inflationary cosmology, showing that quantum-statistical modifications of the entropy-area law can propagate into potentially observable signatures in the physics of the early Universe.