The Cosmological Constant in the Quantum Multiverse
@article{Larsen2011TheCC, title={The Cosmological Constant in the Quantum Multiverse}, author={Grant Larsen and Yasunori Nomura and Hannes L.L. Roberts}, journal={Physical Review D}, year={2011}, volume={84}, pages={123512} }
Recently, a new framework for describing the multiverse has been proposed which is based on the principles of quantum mechanics. The framework allows for well-defined predictions, both regarding global properties of the universe and outcomes of particular experiments, according to a single probability formula. This provides complete unification of the eternally inflating multiverse and many worlds in quantum mechanics. In this paper we elucidate how cosmological parameters can be calculated in…
13 Citations
Quantum Mechanics, Gravity, and the Multiverse
- Physics
- 2012
Abstract The discovery of accelerating expansion of the universe has led us to take the dramatic view that our universe may be one of the many universes in which low energy physical laws take…
The Static Quantum Multiverse
- Physics, Philosophy
- 2012
We consider the multiverse in the intrinsically quantum mechanical framework recently proposed in Refs. [1, 2]. By requiring that the principles of quantum mechanics are universally valid and that…
Quantum Mechanics, Spacetime Locality, and Gravity
- Physics
- 2011
Quantum mechanics introduces the concept of probability at the fundamental level, yielding the measurement problem. On the other hand, recent progress in cosmology has led to the “multiverse”…
The CMB and the measure of the multiverse
- Physics
- 2012
A bstractIn the context of eternal inflation, cosmological predictions depend on the choice of measure to regulate the diverging spacetime volume. The spectrum of inflationary perturbations is no…
Vacuum structure and the arrow of time
- Physics
- 2012
We nd ourselves in an extended era of entropy production. Unlike most other observations, the arrow of time is usually regarded as a constraint on initial con- ditions. I argue, however, that it…
What can the observation of nonzero curvature tell us
- Physics
- 2012
The eternally inflating multiverse provides a consistent framework to understand coincidences and fine-tuning in the universe. As such, it provides the possibility of finding another coincidence: if…
General Properties of Landscapes: Vacuum Structure, Dynamics and Statistics
- Physics
- 2015
Even the simplest extra-dimensional theory, when compactified, can lead to a vast and complex landscape. To make progress, it is useful to focus on generic features of landscapes and…
New scale factor measure
- Mathematics
- 2012
The computation of probabilities in an eternally inflating universe requires a regulator or ``measure.'' The scale factor time measure truncates the Universe when a congruence of timelike geodesics…
Free Scalar Fields in Finite Volume Are Holographic
- Physics
- 2019
This brief note presents a back-of-the-envelope calculation showing that the number of degrees of freedom of a free scalar field in expanding flat space equals the surface area of the Hubble volume…
References
SHOWING 1-10 OF 65 REFERENCES
Multiverse Understanding of Cosmological Coincidences
- Physics
- 2009
There is a deep cosmological mystery: although dependent on very different underlying physics, the time scales of structure formation, of galaxy cooling (both radiatively and against the CMB), and of…
Predictions in eternal inflation
- Physics
- 2008
In generic models of cosmological inflation, quantum fluctuations strongly influence the spacetime metric and produce infinitely many regions where the end of inflation (reheating) is delayed until…
Predicting the cosmological constant from the causal entropic principle
- Physics
- 2007
We compute the expected value of the cosmological constant in our universe from the causal entropic principle. Since observers must obey the laws of thermodynamics and causality, the principle…
Multiverse interpretation of quantum mechanics
- Philosophy
- 2012
We argue that the many-worlds of quantum mechanics and the many worlds of the multiverse are the same thing, and that the multiverse is necessary to give exact operational meaning to probabilistic…
Cosmological constant and the time of its dominance
- Physics
- 1999
We explore a model in which the cosmological constant L and the density contrast at the time of recombination s rec are random variables, whose range and a priori probabilities are determined by the…
Predictions of the causal entropic principle for environmental conditions of the universe
- Physics
- 2008
The causal entropic principle has been proposed as an alternative to the anthropic principle for understanding the magnitude of the cosmological constant. In this approach, the probability to create…
Predicting the cosmological constant with the scale-factor cutoff measure
- Physics
- 2008
It is well known that anthropic selection from a landscape with a flat prior distribution of cosmological constant {lambda} gives a reasonable fit to observation. However, a realistic model of the…
Quantization of four-form fluxes and dynamical neutralization of the cosmological constant
- Physics
- 2000
A four-form gauge flux makes a variable contribution to the cosmological constant. This has often been assumed to take continuous values, but we argue that it has a generalized Dirac quantization…
Likely Values of the Cosmological Constant
- Physics
- 1997
In theories in which the cosmological constant takes a variety of values in different "subuniverses," the probability distribution of its observed values is conditioned by the requirement that there…
Predictions from Star Formation in the Multiverse
- Mathematics
- 2010
We compute trivariate probability distributions in the landscape, scanning simultaneously over the cosmological constant, the primordial density contrast, and spatial curvature. We consider two…