# Classical and quantum exact solutions for the anisotropic Bianchi type I in multi-scalar field cosmology with an exponential potential driven inflation

## TL;DR

This paper derives exact classical and quantum solutions for anisotropic Bianchi type I cosmology with multiple scalar fields and an exponential potential, advancing understanding of inflationary models in both regimes.

## Contribution

It provides new exact solutions for the Einstein-Klein-Gordon system and the Wheeler-DeWitt equation in multi-scalar field inflationary cosmology with anisotropy.

## Key findings

- Exact classical solutions for different parameter regimes.
- Quantum solutions via Wheeler-DeWitt equation.
- Insights into anisotropic inflationary dynamics.

## Abstract

The anisotropic Bianchi type I in multi-scalar field cosmology is studied with a particular potential of the form $\rm V= V_0 e^{-\left[\lambda_1 \phi_1 + \cdots + \lambda_n \phi_n \right]}\,,$ which emerges as a condition between the time derivatives of their corresponding momenta. Using the Hamiltonian formalism for the inflation epoch with a quintessence framework we find the exact solutions for the Einstein-Klein-Gordon (EKG) system with different scenarios specified by the parameter $\rm \lambda^2= \sum_{i=1}^n \lambda_i^2$. For the quantum scheme of this model, the corresponding Wheeler-DeWitt (WDW) equation is solved by applying an appropriate change of variables and suitable ansatz.