‘Frontiers of gravitational physics’ considers some of the issues involved in the theoretical description of gravity. Since 1915, it has been Einstein’s theory that has shaped our understanding of the gravitational interaction, but a lot has happened in the world of theoretical physics since then. Quantum mechanics, devised by Bohr, Heisenberg, and Schrödinger, is incompatible with gravity and so has raised numerous questions. Several theories, including String Theory and Loop Quantum Gravity, have been proposed with some success. The concepts of cosmic inflation, the cosmological constant, and the possibility of multiple universes are also discussed. It concludes that with further astrophysical studies a new fundamental theory may explain it all.
Loop quantum gravity and cosmological constant
