This book presents&nbsp;a high-level study of cosmology with interacting dark energy and no additional fields. It is known that dark energy is not necessarily uniform when other sources of gravity are present: interaction with matter leads to its variation in space and time. The present&nbsp;text studies the cosmological implications of this circumstance&nbsp;by analyzing cosmological models in which the dark energy&nbsp;density interacts with matter and thus changes with the time.&nbsp;The book&nbsp;also includes a translation of a seminal&nbsp;article about the remarkable life and work of E.B. Gliner,&nbsp;the first person&nbsp;to suggest the concept of dark energy in 1965.&nbsp;<p></p>