Albert Einstein proved that time is relative. The faster you move through space, the slower you move through time (Time Dilation).
Introduced the "repairing the timeline" trope ( Back to the Future ). A Brief History of Time Travel
Any history of the topic must address why we haven't seen any "time tourists" yet. Albert Einstein proved that time is relative
Theoretical "bridges" through space-time (Einstein-Rosen bridges) that could technically connect two different points in time. 3. The Paradoxes A Brief History of Time Travel