Quantum fog and the degradation of information by the gravitational field

M. Schiffer

Research output: Contribution to journalArticlepeer-review


In this paper we discuss how information transferred optically through a gravitational field is degraded as the quanta interact with the madium (vacuum state). We quantify information by means of Shannon's entropy, and consider information carriers that are quanta of some field. Next, we obtain the quantum noise ('quantum fog') produced by the gravitational field and derive the appropriate 'channel capacity' formula, which quantifies the maximum amount of information that can be transmitted per pulse, in the face of this noise. We show that the channel capacity formula vanishes if the source of information is a space-time singularity because a very intense noise is produced in the vicinity of the singularity. In other words, space-time singularities are hidden behind a very intense 'quantum fog' and cannot be optically observed. A second consequence is that information is degraded as anisotropies (lumpiness) develop in the universe.

Original languageEnglish
Pages (from-to)721-752
Number of pages32
JournalGeneral Relativity and Gravitation
Issue number7
StatePublished - Jul 1993
Externally publishedYes


Dive into the research topics of 'Quantum fog and the degradation of information by the gravitational field'. Together they form a unique fingerprint.

Cite this