Violation of the strong Huygen's principle and timelike signals from the early universe

Phys Rev Lett. 2015 Apr 10;114(14):141103. doi: 10.1103/PhysRevLett.114.141103. Epub 2015 Apr 7.

Abstract

We analyze the implications of the violations of the strong Huygen's principle in the transmission of information from the early Universe to the current era via massless fields. We show that much more information reaches us through timelike channels (not mediated by real photons) than is carried by rays of light, which are usually regarded as the only carriers of information.