On a probable manifestation of Hubble expansion at the local scales, as inferred from LLR data

Abstract

Processing the data of lunar laser ranging (LLR), whose accuracy now reaches a few millimeters, points to the effect of anomalous increase in the lunar semimajor axis (with an excessive rate 1.3 cm/yr), which cannot be attributed to the well-known tidal exchange of angular momentum between the Earth and Moon. One of the possible interpretations of the above-mentioned anomaly may be the "local" Hubble expansion with H = 33 +/- 5 (km/s)/Mpc. This small value of the local Hubble constant (about two times less than at intergalactic scales) can be reasonably explained if it is formed only by some kind of an unclumped "dark matter" or "dark energy", while the other kinds of matter experienced a gravitational instability, formed compact objects, and no longer contribute to the formation of Hubble expansion at the local scales.