# Bianchi-I cosmological model and crossing singularities

## TL;DR

This paper introduces a simple method for crossing cosmological singularities in Bianchi-I models, aligning with complex methods in flat universes, and provides asymptotic solutions for anisotropic universes with scalar fields.

## Contribution

It extends a straightforward singularity crossing method from flat to anisotropic Bianchi-I universes and offers asymptotic solutions with scalar fields.

## Key findings

- Method aligns with complex approaches in flat universes.
- Provides early-time and late-time asymptotic solutions.
- Demonstrates singularity crossing in anisotropic models.

## Abstract

We consider a rather simple method for the description of the Big Bang - Big Crunch cosmological singularity crossing. For the flat Friedmann universe this method gives the same results as more complicated methods, using Weyl symmetry or the transitions between the Jordan and Einstein frames. It is then easily generalized for the case of a Bianchi-I anisotropic universe. We also present early-time and late-time asymptotic solutions for a Bianchi-I universe, filled with a conformally coupled massless scalar field.