# Cosmic Archeology

A.2010-1

Searching for signatures of cosmic-scale archaeological artifacts such as Dyson spheres or Kardashev civilizations is an interesting alternative to conventional SETI. Uncovering such an artifact does not require the intentional transmission of a signal on the part of the original civilization. For example, the constraints of the anthropic principle would have to be loosened if a different type of intelligence was discovered elsewhere. A variety of interstellar archaeology signatures are discussed including non-natural planetary atmospheric constituents, stellar doping with isotopes of nuclear wastes, Dyson spheres, as well as signatures of stellar and galactic-scale engineering. The concept of a Fermi bubble due to interstellar migration is introduced in the discussion of galactic signatures.

https://archive.wikiwix.com/cache/index2.php?url=https%3A%2F%2Farxiv.org%2Fabs%2F1001.5455#federation=archive.wikiwix.com

Searching for signatures of cosmic-scale archaeological artifacts such as Dyson spheres or Kardashev civilizations is an interesting alternative to conventional SETI. Uncovering such an artifact does not require the intentional transmission of a signal on the part of the original civilization. This type of search is called interstellar archaeology or sometimes cosmic archaeology. The detection of intelligence elsewhere in the Universe with interstellar archaeology or SETI would have broad implications for science. For example, the constraints of the anthropic principle would have to be loosened if a different type of intelligence was discovered elsewhere. A variety of interstellar archaeology signatures are discussed including non-natural planetary atmospheric constituents, stellar doping with of nuclear wastes, Dyson spheres, as well as signatures of stellar and galactic-scale engineering. The of a bubble due to interstellar migration is introduced in the discussion of galactic signatures. These potential interstellar archaeological signatures are classified using the Kardashev scale. A modified Drake equation is used to evaluate the relative challenges of finding various sources. With few exceptions interstellar archaeological signatures are clouded and beyond current technological capabilities. However SETI for so-called cultural transmissions and planetary atmosphere signatures are within reach.

Starry Messages: Searching for Signatures of Interstellar Archaeology

Richard A. Carrigan Jr (Fermi National Accelerator Laboratory)

(Submitted on 29 Jan 2010)

https://archive.wikiwix.com/cache/index2.php?url=https%3A%2F%2Farxiv.org%2Fabs%2F1001.5455#federation=archive.wikiwix.com

Il est toujours possible que l’humanité puisse détecter les traces d’une civilisation disparue. La recherche de traces matérielles de telles civilisations (sphères de Dyson ou moteurs stellaires par exemple), « alternative intéressante » au programme SETI conventionnel, jette les bases d’une « archéologie cosmique » selon Richard A. Carrigan. Les efforts pour détecter des d’intelligence dans l’atmosphère des exoplanètes (comme le fréon, l’oxygène ou même l’ozone, résidus de l’activité biotique suivant les recherches de James Lovelock) en est l’un des axes prometteurs. Une civilisation observant son étoile mourir (en géante  par exemple) pourrait avoir tenté d’en prolonger l’existence, par des mégastructures qui devraient être détectables. Les traces possibles pourraient alors être des résidus nucléaires, à rechercher au sein des types spectraux de la gamme A5 jusqu’à F2, selon Whitmire et Wright7, un changement dans le ratio isotopique, dû à un moteur stellaire ou encore une modulation spectrale inhabituelle dans la composition de l’astre.

http://archivesgamma.fr/2022/03/21/cosmic-archeology