• Share
  • Email
  • Embed
  • Like
  • Save
  • Private Content
Boltzmann brains and the scale factor cutoff measure of the multiverse by andrea de simone alan h guth  andrei linde mahdiyar noorbala michael p salem and alexander vilenkin
 

Boltzmann brains and the scale factor cutoff measure of the multiverse by andrea de simone alan h guth andrei linde mahdiyar noorbala michael p salem and alexander vilenkin

on

  • 1,307 views

To make predictions for an eternally inflating ‘‘multiverse,’’ one must adopt a procedure for regulating ...

To make predictions for an eternally inflating ‘‘multiverse,’’ one must adopt a procedure for regulating
its divergent spacetime volume. Recently, a new test of such spacetime measures has emerged: normal
observers—who evolve in pocket universes cooling from hot big bang conditions—must not be vastly
outnumbered by ‘‘Boltzmann brains’’—freak observers that pop in and out of existence as a result of rare
quantum fluctuations. If the Boltzmann brains prevail, then a randomly chosen observer would be
overwhelmingly likely to be surrounded by an empty world, where all but vacuum energy has redshifted
away, rather than the rich structure that we observe. Using the scale-factor cutoff measure, we calculate
the ratio of Boltzmann brains to normal observers.We find the ratio to be finite, and give an expression for
it in terms of Boltzmann brain nucleation rates and vacuum decay rates. We discuss the conditions that
these rates must obey for the ratio to be acceptable, and we discuss estimates of the rates under a variety of
assumptions.

Statistics

Views

Total Views
1,307
Views on SlideShare
1,307
Embed Views
0

Actions

Likes
0
Downloads
1
Comments
0

0 Embeds 0

No embeds

Accessibility

Categories

Upload Details

Uploaded via as Adobe PDF

Usage Rights

© All Rights Reserved

Report content

Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
  • Full Name Full Name Comment goes here.
    Are you sure you want to
    Your message goes here
    Processing…
Post Comment
Edit your comment

    Boltzmann brains and the scale factor cutoff measure of the multiverse by andrea de simone alan h guth  andrei linde mahdiyar noorbala michael p salem and alexander vilenkin Boltzmann brains and the scale factor cutoff measure of the multiverse by andrea de simone alan h guth andrei linde mahdiyar noorbala michael p salem and alexander vilenkin Document Transcript