Transfer of atomic mass with a photon solves the momentum paradox of light – Aalto University

In a recent publication, Aalto University researchers show that in a transparent medium each photon is accompanied by an atomic mass density wave. The novel discovery solves the centennial momentum paradox of light. 
If this theoretical finding is proven true with experiments, it can affect our understanding of universe:

“Presently the Hubble’s law is explained by Doppler shift being larger from distant stars. This effectively supports the hypothesis of expanding universe. In the mass polariton theory of light this hypothesis is not needed since redshift becomes automatically proportional to the distance from the star to the observer”, explains Professor Jukka Tulkki.


  1. Tomi Engdahl says:

    Photon mass drag and the momentum of light in a medium – Aalto University Research

    Article in Physical Review:
    Photon mass drag and the momentum of light in a medium

  2. Tomi Engdahl says:

    Other view on the new theory and expansion of space:

    Kosmologi tyrmää Aalto-yliopiston tiedotteen – “Haittaa ihmisten ymmärrystä tieteestä”


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