Quantum Non-thermal Effect from Black Holes Surrounded by Quintessence

We present a short and direct derivation of Hawking radiation as atunneling process across the horizon and compute the tunneling probability. Considering the self-gravitation and energy conservation, we use the Keski-Vakkuri, Kraus, and Wilczek (KKW) analysis to compute the temperature and entropy of the black holes surrounded by quintessence and obtain the temperature and entropy are different from the Hawking temperature and theBekenstein-Hawking entropy. The result we get can offer a possiblemechanism to deal with the information loss paradox because thespectrum is not purely thermal.