George Ellis corrects Leonard Susskind

  • Thread starter marcus
  • Start date


Science Advisor
Gold Member
Dearly Missed
George Ellis has found an apparent mistake in Lenny Susskind's recent book "The Cosmic Landscape" about the multitude of string theory vacua and ideas of a multiverse.

Ellis is an interesting figure, this thread has some background and comment on a recent article Ellis wrote for an Elsevier Handbook.

Ellis is co-author, with Stephen Hawking, of a well-known reference "The Large-Scale Structure of Spacetime"

Regarding Susskind, he posts the following note:

On horizons and the cosmic landscape
George F R Ellis

"Susskind claims in his recent book The Cosmic Landscape that evidence for the existence and nature of 'pocket universes' in a multiverse would be available via detailed study of the Cosmic Blackbody Background Radiation. I point out that apart from any other queries one might have about the chain of argument involved, this claim is invalid because it rests on a confusion between the nature of a particle horizon and an event horizon in cosmology."

Ellis gives this link to a passage of Susskind's book containing the questionable claim: [Broken]

[my comment: this seems to be a decent way for the arxiv to work, no blogs or trackback mechanism needed---if you find an error, simply post a note on arxiv politely pointing it out]
Last edited by a moderator:

Want to reply to this thread?

"George Ellis corrects Leonard Susskind" You must log in or register to reply here.

Physics Forums Values

We Value Quality
• Topics based on mainstream science
• Proper English grammar and spelling
We Value Civility
• Positive and compassionate attitudes
• Patience while debating
We Value Productivity
• Disciplined to remain on-topic
• Recognition of own weaknesses
• Solo and co-op problem solving