Carregant...
Fitxers
Tipus de document
ArticleVersió
Versió publicadaData de publicació
Tots els drets reservats
Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/106610
Cosmic explosions, life in the universe, and the cosmological constant
Títol de la revista
Director/Tutor
ISSN de la revista
Títol del volum
Recurs relacionat
Resum
Gamma-ray bursts (GRBs) are copious sources of gamma rays whose interaction with a planetary atmosphere can pose a threat to complex life. Using recent determinations of their rate and probability of causing massive extinction, we explore what types of universes are most likely to harbor advanced forms of life. We use cosmological N -body simulations to determine at what time and for what value of the cosmological constant (Λ) the chances of life being unaffected by cosmic explosions are maximized. Life survival to GRBs favors Lambda-dominated universes. Within a cold dark matter model with a cosmological constant, the likelihood of life survival to GRBs is governed by the value of Λ and the age of the Universe. We find that we seem to live in a favorable point in this parameter space that minimizes the exposure to cosmic explosions, yet maximizes the number of main sequence (hydrogen-burning) stars around which advanced life forms can exist.
Matèries (anglès)
Citació
Citació
PIRAN, Tsvi, JIMÉNEZ, Raúl (jiménez tellado), CUESTA, Antonio j., SIMPSON, Fergus, VERDE, Licia. Cosmic explosions, life in the universe, and the cosmological constant. _Physical Review Letters_. 2016. Vol. 116, núm. 081301, pàgs. 1-5. [consulta: 24 de gener de 2026]. ISSN: 0031-9007. [Disponible a: https://hdl.handle.net/2445/106610]