Monday, March 12, 2012

Cosmic inflation is a form of life?

Cosmic inflation (more precisely, the Hubble patch which is undergoing inflation) is a form of life? Clearly not in common sense. However, according to Wikipedia: Life is a characteristic of organisms that exhibit all or most of the following 7 phenomena:

1. Homeostasis: Regulation of the internal environment to maintain a constant state; for example, electrolyte concentration or sweating to reduce temperature.
Yes, this is the "no hair" property of (quasi-) de Sitter phase. A nearly vacuum state is maintained. Inflation pushes things outside the horizon in order to reduce its temperature to Gibbons-Hawking temperature.
2. Organization: Being structurally composed of one or more cells, which are the basic units of life.
Yes, the Hubble volume is a cell.
3. Metabolism: Transformation of energy by converting chemicals and energy into cellular components (anabolism) and decomposing organic matter (catabolism). Living things require energy to maintain internal organization (homeostasis) and to produce the other phenomena associated with life.
This piece of definition assumes energy conservation. In cosmology, energy (of matter) is not globally conserved. With this in mind, only the italic part of the above is essential. Then inflation again has this property from its own production of energy.
4. Growth: Maintenance of a higher rate of anabolism than catabolism. A growing organism increases in size in all of its parts, rather than simply accumulating matter.
Indeed there is growth during inflation. More seriously, the Hubble volume even grows itself because of the null energy condition.
5. Adaptation: The ability to change over a period of time in response to the environment. This ability is fundamental to the process of evolution and is determined by the organism's heredity as well as the composition of metabolized substances, and external factors present.
Yes, inflation is an attractor solution. It is stable (adaptation) against small perturbations.
6. Response to stimuli: A response can take many forms, from the contraction of a unicellular organism to external chemicals, to complex reactions involving all the senses of multicellular organisms. A response is often expressed by motion, for example, the leaves of a plant turning toward the sun (phototropism) and by chemotaxis.
Yes or no, because response is hard to define here. As mentioned, "a response is often expressed by motion". How to define the motion (or any other response) of an inflationary patch of universe? Here I don't want to comment to much because lack of definition. However, the "centre" of inflation could indeed move on the space manifold, towards the regime where inflation is easier to happen.
7. Reproduction: The ability to produce new individual organisms, either asexually from a single parent organism, or sexually from two parent organisms.
Yes. I have considered Hubble volume as one cell. Then inflation is indeed self-reproducing process, even in its observable stage.  Needless to mention eternal inflation is self-reproducing in every sense. Even sexually reproduction may be possible from bubble collisions :-)

In another section, Wikipedia also mentioned
Biophysicists have also commented on the nature and qualities of life forms—notably that they function on negative entropy. In more detail, according to physicists such as John Bernal, Erwin Schrödinger, Eugene Wigner, and John Avery, life is a member of the class of phenomena which are open or continuous systems able to decrease their internal entropy at the expense of substances or free energy taken in from the environment and subsequently rejected in a degraded form.
Again yes. Inflation pushes entropy to its Hubble horizon (environment).

Thus, how can I argue inflation is not life... Moreover, occasionally inflation is even intelligence, from Boltzmann brains :-)

1 comment:

  1. I always found that stars are also a very good candidate of extraterrestrial life forms ;)

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