Warped Spacetime, the Einstein Equations, and the Expanding Universe

From the contents:
1: Curved Spacetime. 2: The Equivalence Principle: the Elephant and the Ping-pong Ball. 3: Why Spacetime Curves: Time Warps and Tired Light. 4: Worldlines and Geodesics. 4b: Gravity as Geometry. 5: The Relationship between Curvature, Acceleration and Gravity. 6: Curvature Computations. 7: The Geometry of Curved Spacetimes: Metrics. 8: Spherical Spaces. 9: 3 S&M: Spherically Symmetric Static Metrics. 10: The Physics of Curved Spacetimes: A Preview. 11: Homogeneous Isotropic Spacetimes. 12: Discussion. 13: How and Why Gravity Leads to Curved Spacetime. 14: Much Ado about Nothing: The Vacuum Metric (the Schwarzschild Solution). 15: Embeddings, Truncations and Smooth Joinings. 16: Black Holes . 17: Wormholes and Time Travel. 18: Newtonian Gravity and Cosmology. 19: Geodesic Motion in Curved Spacetime. 20: The Gravitational Effect of an Electric Field. 21: Generalized Vacuum: Spacetimes with the Reciprocal Metric form. 22:The Einstein Equation for Generalized Vacuum. 23: Heuristic Derivations of the Einstein Equation for Generalized Vacuum. 24: The Poisson-Einstein Equation for Generalized Vacuum. 25: Heuristic Derivations