Interesting comments by IG2007 in post #174 and Cat on physical law in post #175. In inflation epoch, Alan Guth uses replusive gravity, something that GR allows, gravity as attractive or replusive. Do we see replusive gravity operating in the universe today? Example, Jupiter's Galilean moons, the Moon receding from Earth, binary star systems like Sirius A and B? Do we see inflation operating in the universe today? Inflation now features the physics used to describe the origin of the universe during the post-inflation period too (likely near 10^-20 second after BB event), even sub-Planckian physics and perhaps faster than the Planck time. All of this *natural* evolutionary process takes place long before the CMBR is said to form in an expanding universe, expanding at speeds >> c before the CMBR forms. Any object in the universe today with a redshift or z >= 1.4 is moving away faster than c velocity in expanding space - at its present location or comoving radial distance (something that cannot be observed). It seems in BB cosmology, some physical laws used like inflation epoch and post-inflation universe may not be operating in our solar system today, or other star systems observable in astronomy or in the observable universe. How many different laws are used like this I do not know.