Regular Article - Theoretical Physics
Estimation of temperature of cosmological apparent horizons: a new approach
Indian Institute of Science Education and Research Kolkata, Mohanpur, 741246, Nadia, India
Accepted: 4 July 2021
Published online: 13 July 2021
We consider radiation from cosmological apparent horizon in Friedmann–Lemaitre–Robertson–Walker (FLRW) model in a double-null coordinate setting. As the spacetime is dynamic, there is no timelike Killing vector, instead we have Kodama vector which acts as dynamical time. We construct the positive frequency modes of the Kodama vector across the horizon. The conditional probability that a signal reaches the central observer when it is crossing from the outside gives the temperature associated with the horizon.
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