Back Deeltjiehorison Afrikaans أفق الجسيمات Arabic Partikelhorisont Danish Teilchenhorizont German Horizonte de partículas Spanish Kosmoloogiline horisont Estonian Hiukkashorisontti Finnish Horizon des particules French Orizzonte di particella Italian 입자 지평선 Korean
The particle horizon (also called the cosmological horizon, the comoving horizon (in Scott Dodelson's text), or the cosmic light horizon) is the maximum distance from which light from particles could have traveled to the observer in the age of the universe. Much like the concept of a terrestrial horizon, it represents the boundary between the observable and the unobservable regions of the universe,[1] so its distance at the present epoch defines the size of the observable universe.[2] Due to the expansion of the universe, it is not simply the age of the universe times the speed of light (approximately 13.8 billion light-years), but rather the speed of light times the conformal time. The existence, properties, and significance of a cosmological horizon depend on the particular cosmological model.
- ^ Edward Robert Harrison (2000). Cosmology: the science of the universe. Cambridge University Press. pp. 447–. ISBN 978-0-521-66148-5. Retrieved 1 May 2011.
- ^ Andrew R. Liddle; David Hilary Lyth (13 April 2000). Cosmological inflation and large-scale structure. Cambridge University Press. pp. 24–. ISBN 978-0-521-57598-0. Retrieved 1 May 2011.