The Ĝ Infrared Search for Extraterrestrial Civilizations with Large Energy Supplies

I.  Background and Justification

J. T. Wright, B. Mullan, S. Sigurðsson, M. S. Povich

We motivate the Ĝ infrared search for extraterrestrial civilizations with large energy supplies.
We discuss some philosophical difficulties of SETI, and how communication SETI circumvents them.
We review “Dysonian SETI”, the search for artifacts of alien civilizations, and find that it is highly complementary to traditional communication SETI; the two together might succeed where either one, alone, has not.
We discuss the argument of Hart (1975) that spacefaring life in the Milky Way should be either galaxy-spanning or non-existent, and examine a portion of his argument that we dub the “monocultural fallacy”.
We discuss some rebuttals to Hart that invoke sustainability and predict long Galaxy colonization timescales.
We find that the maximum Galaxy colonization timescale is actually much shorter than previous work has found (109 yr), and that many “sustainability” counter-arguments to Hart’s thesis suffer from the monocultural fallacy.
We extend Hart’s argument to alien energy supplies, and argue that detectably large energy supplies can plausibly be expected to exist because life has potential for exponential growth until checked by resource or other limitations, and intelligence implies the ability to overcome such limitations.
As such, if Hart’s thesis is correct then searches for large alien civilizations in other galaxies may be fruitful; if it is incorrect, then searches for civilizations within the Milky Way are more likely to succeed than Hart argued. We review some past Dysonian SETI efforts, and discuss the promise of new mid-infrared surveys, such as that of WISE…
… Read more at http://arxiv.org/pdf/1408.1133v1.pdf

Advertisements

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s