2011/04/30 by Javad T. Firouzjaee, J. T. Firouzjaee, Reza Mansouri +1
Physics and Astronomy · #Black Holes and Theoretical Physics #Black hole (networking) #Computer science #Computer security #Cosmology and Gravitation Theories #Optics #Particle physics theoretical and experimental studies #Physics #Radiation #gr-qc
paper · pdf · doi:10.1209/0295-5075/97/29002
9 pages, revised version, Europhysics Letter 2012 97 29002
openalex publication_date 2012/01/01 · arxiv created 2012/10/16 · arxiv updated 2015/05/27 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Does a dynamical black hole embedded in a cosmological FRW background emit the Hawking radiation where a globally defined event horizon does not exist? What are the differences to the Schwarzschild black hole? What about the first law of black-hole mechanics? We face these questions using the LTB cosmological black-hole model recently published. Using the Hamilton-Jacobi and radial null geodesic methods suitable for dynamical cases, we show that it is the apparent horizon which contributes to the Hawking radiation and not the event horizon. The Hawking temperature is calculated using the two different methods giving the same result. The first law of LTB black-hole dynamics and the thermal character of the radiation is also dealt with.