[institut] Kolokvijum Instituta za fiziku: Dejan Stojkovic, cetvrtak, 21. maj, 12:00

[Antun Balaz]

Поштоване колегинице и колеге,

Са задовољством вас позивам на

КОЛОКВИЈУМ ИНСТИТУТА ЗА ФИЗИКУ

који ће се одржати у четвртак 21. маја 2015. године са почетком у 12 часова у сали “Звонко Марић” Института за физику у Београду. Предавање под називом:

UNITARY EVOLUTION OF GRAVITATIONAL COLLAPSE

одржаће проф. др Дејан Стојковић (University at Buffalo - The State University of New York). Апстракт предавања:

The process of gravitational collapse excites the fields propagating in the background geometry and gives rise to thermal radiation. We demonstrate by explicit calculations that the density matrix corresponding to such radiation actually describes a pure state. While Hawking's leading order density matrix contains only the diagonal terms, we calculate the off-diagonal correlation terms. These correlations start very small, but then grow in time. The cumulative effect is that the correlations become comparable to the leading order terms and significantly modify the density matrix. While the trace of the Hawking's density matrix squared goes from unity to zero during the evolution, the trace of the total density matrix squared remains unity at all times and all frequencies. This implies that the process of radiation from a collapsing object is unitary.

Срдачан поздрав,
Антун Балаж

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Antun Balaz
E-mail: antun at ipb.ac.rs
Web: http://www.scl.rs/antun

Phone: +381 11 3713152
Fax: +381 11 3162190

Scientific Computing Laboratory
Institute of Physics Belgrade
Pregrevica 118, 11080 Belgrade, Serbia
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