Stationary measure in the multiverse

@article{Linde2009StationaryMI,
  title={Stationary measure in the multiverse},
  author={Andrei Linde and Vitaly Vanchurin and Sergei Winitzki},
  journal={Journal of Cosmology and Astroparticle Physics},
  year={2009},
  volume={2009},
  pages={031-031}
}
We study the recently proposed ''stationary measure'' in the context of the string landscape scenario. We show that it suffers neither from the ''Boltzmann brain'' problem nor from the ''youngness'' paradox that makes some other measures predict a high CMB temperature at present. We also demonstrate a good performance of this measure in predicting the results of local experiments, such as proton decay. 
de Sitter equilibrium as a fundamental framework for cosmology
Cosmology might turn out to be the study of fluctuations around a "de Sitter equilibrium" state. In this article I review the basic ideas and the attractive features of this framework, and respond to
Boltzmann brains and the scale-factor cutoff measure of the multiverse
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:
Global-local duality in eternal inflation
We prove that the light-cone time cutoff on the multiverse defines the same probabilities as a causal patch with initial conditions in the longest-lived metastable vacuum. This establishes the
Towards a non-anthropic solution to the cosmological constant problem
Many probability measures in the multiverse depend exponentially on some observable parameters, giving rise to potential problems such as youngness bias, Q-catastrophe etc. In this paper we explore a
Phenomenology of the CAH+ measure
The CAH+ measure regulates the infinite spacetime volume of the multiverse by constructing a surface of constant comoving apparent horizon (CAH) and then removing the future lightcones of all points
Prepared for submission to JCAP Watchers of the multiverse
An unresolved question in inflationary cosmology is the assignment of probabilities to different types of events that can occur in the eternally inflating multiverse. We explore the possibility that
Making predictions in the multiverse
I describe reasons to think we are living in an eternally inflating multiverse where the observable "constants" of nature vary from place to place. The major obstacle to making predictions in this
Rescuing the Born Rule for Quantum Cosmology
Page has recently argued that the Born rule does not suffice for computing all probabilities in quantum cosmology. He further asserts that the Born rule's failure gives rise to the cosmological
Volume weighting the measure of the universe from classical slow-roll expansion
One of the most frustrating issues in early universe cosmology centers on how to reconcile the vast choice of universes in string theory and in its most plausible high energy sibling, eternal
...
1
2
3
4
5
...

References

SHOWING 1-10 OF 78 REFERENCES
Freak observers and the measure of the multiverse
I suggest that the factor pj in the pocket-based measure of the multiverse, Pj = pj fj, should be interpreted as accounting for equilibrium de Sitter vacuum fluctuations, while the selection factor
Reheating-volume measure in the string theory landscape
I recently proposed the ''reheating-volume'' (RV) prescription as a possible solution to the measure problem in ''multiverse'' cosmology. The goal of this work is to extend the RV measure to
A paradox in the global description of the multiverse
We use an argument by Page to exhibit a paradox in the global description of the multiverse: the overwhelming majority of observers arise from quantum fluctuations and not by conventional evolution.
Geodesic measures of the landscape
We study the landscape models of eternal inflation with an arbitrary number of different vacua states, both recyclable and terminal. We calculate the abundances of bubbles following different
Reheating-volume measure for random-walk inflation
The recently proposed ``reheating-volume'' (RV) measure promises to solve the long-standing problem of extracting probabilistic predictions from cosmological multiverse scenarios involving eternal
Unambiguous probabilities in an eternally inflating universe
``Constants of Nature'' and cosmological parameters may in fact be variables related to some slowly-varying fields. In models of eternal inflation, such fields will take different values in different
Boltzmann babies in the proper time measure
After commenting briefly on the role of the typicality assumption in science, we advocate a phenomenological approach to the cosmological measure problem. Like any other theory, a measure should be
Boltzmann brains and the scale-factor cutoff measure of the multiverse
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:
Probabilities in the inflationary multiverse
Inflationary cosmology leads to the picture of a 'multiverse', involving an infinite number of (spatially infinite) post-inflationary thermalized regions, called pocket universes. In the context of
Sinks in the landscape, Boltzmann brains and the cosmological constant problem
This paper extends a recent investigation of the string theory landscape (Ceresole et al 2006 Phys. Rev. D 74 086010), where it was found that the decay rate of de Sitter (dS) vacua to a collapsing
...
1
2
3
4
5
...