caa a22 4500 467887012 CHVBK 20180406152737.0 cr unu---uuuuu 170328e20060701xx s 000 0 eng 10.1007/s10714-006-0302-5 doi (NATIONALLICENCE)springer-10.1007/s10714-006-0302-5 Xue She-Sheng ICRANet and Physics Department, University of Rome "La Sapienza”, 00185, Rome, Italy aut Photon Productions in a Gravitational Collapsing [Elektronische Daten] [She-Sheng Xue] We study a possible gravitational vacuum-effect, in which vacuum-energy variation is due to variation of gravitational field, vacuum state gains gravitational energy and releases it by spontaneous photon emissions. Based on the path-integral representation, we present a general formulation of vacuum transition matrix and energy-momentum tensor of a quantum scalar field theory in curved spacetime. Using analytical continuation of dimensionality of the phase space, we calculate the difference of vacuum-energy densities in the presence and absence of gravitational field. Using the dynamical equation of gravitational collapse, we compute the rate of vacuum state gaining gravitational energy. Computing the transition amplitude from initial vacuum state to final vacuum state in gravitational collapsing process, we show the rate and spectrum of spontaneous photon emissions for releasing gravitational energy. We compare our idea with the Schwinger idea for Sonoluminiescence and contrast our scenario with the Hawking effect. Springer Science+Business Media, Inc., 2006 04.62.+v nationallicence 04.70.Dy nationallicence General Relativity and Gravitation Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 38/7(2006-07-01), 1135-1172 0001-7701 38:7<1135 2006 38 10714 https://doi.org/10.1007/s10714-006-0302-5 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10714-006-0302-5 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Xue She-Sheng ICRANet and Physics Department, University of Rome "La Sapienza”, 00185, Rome, Italy aut NATIONALLICENCE 773 0- General Relativity and Gravitation Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 38/7(2006-07-01), 1135-1172 0001-7701 38:7<1135 2006 38 10714 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer