Yes, landlords in Louisiana are able to enter an occupied unit without permission by default. Due to a lack of statutory regulation on the matter, landlords and tenants must work out alternative standards for a right to entry on their own. Such a lease agreement should include details about how much notice must be given as well as the circumstances that allow for a justified entrance (such as when making a repair or showing the unit).
The information for this answer was found on our Louisiana Landlord Tenant Rights answers.