title: Violation of the strong Huygen's principle and timelike signals from the early universe.
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.
authors.affiliation: Departamento de Física Teórica II, Universidad Complutense de Madrid, 28040 Madrid, Spain.
authors.forename: Ana
authors.initials: A
authors.lastname: Blasco
authors.affiliation: Departamento de Física Teórica II, Universidad Complutense de Madrid, 28040 Madrid, Spain.|Instituto de Estructura de la Materia (IEM-CSIC), Serrano 121, 28006 Madrid, Spain.
authors.forename: Luis J
authors.initials: LJ
authors.lastname: Garay
authors.affiliation: Institute for Mathematics, Astrophysics and Particle Physics, Radboud University Nijmegen, Heyendaalseweg 135, NL-6525 AJ Nijmegen, Netherlands.
authors.forename: Mercedes
authors.initials: M
authors.lastname: Martín-Benito
authors.affiliation: Institute for Quantum Computing, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada.|Department of Applied Mathematics, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada.|Perimeter Institute for Theoretical Physics, Waterloo, Ontario N2L 6B9, Canada.
authors.forename: Eduardo
authors.initials: E
authors.lastname: Martín-Martínez