These virtual particles interact with each other, giving rise to a non-zero energy density and pressure. Ohanian assumed that this energy density and pressure are responsible for the gravitational field.
Gravitation and Spacetime by Ohanian is an excellent choice for anyone seeking a of general relativity without getting lost in pure differential geometry. Its strength lies in connecting the math to real experiments and astronomical observations. While not the most mathematically sophisticated, it provides a solid foundation for further study in gravitational physics, black holes, and cosmology. ohanian gravitation and spacetime pdf
Many problems are conceptually rich but lack intermediate steps; some PDF scans omit answer hints. For self-study, you may need a separate solutions manual (hard to find legally). These virtual particles interact with each other, giving