particle horizon Definition and 1 Threads

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, so its distance at the present epoch defines the size of the observable universe. 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.

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  1. Jaime Rudas

    I The Boundary of the Observable Universe

    In a recent discussion on the Cosmological Redshift in Simulated Universe thread, I claimed that the boundary of the observable universe is the particle horizon, that objects could enter the observable universe but could not leave it, and that objects outside the observable universe could not...
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