Neutron Star

Neutron stars are created when giant stars die in supernovas and their cores collapse. The protons and electrons essentially melt into each other and form neutrons. Now this time travel theory is one that could actually work, providing you can survive gravity and tidal forces that destroy your body to the molecular level and becoming part of the star itself. When you stand on the surface of a neutron star, time will be distorted, therefore you will time travel.