> BEGIN:VCALENDAR VERSION:2.0 PRODID:-//WISTA Management GmbH/ METHOD:PUBLISH X-MS-OLK-FORCEINSPECTOROPEN:TRUE BEGIN:VTIMEZONE TZID:W. Europe Standard Time BEGIN:STANDARD DTSTART:16011028T030000 RRULE:FREQ=YEARLY;BYDAY=-1SU;BYMONTH=10 TZOFFSETFROM:+0200 TZOFFSETTO:+0100 END:STANDARD BEGIN:DAYLIGHT DTSTART:16010325T020000 RRULE:FREQ=YEARLY;BYDAY=-1SU;BYMONTH=3 TZOFFSETFROM:+0100 TZOFFSETTO:+0200 END:DAYLIGHT END:VTIMEZONE BEGIN:VEVENT UID:48919 LOCATION:Research Training Group 2575 “Rethinking Quantum Field Theory”, HU Berlin , Zum Großen Windkanal 2, 12489 Berlin IRIS Adlershof, Raum 1.221 CREATED:20230324T125809Z DTSTAMP:20230324T125929Z SUMMARY:Seminar: Energy (non-)conservation and an alternative conserved charge in a curved spacetime (general relativity) DESCRIPTION: X-ALT-DESC;FMTTYPE=text/html:

Prof. Dr. Sinya Aoki
Yukawa Institute for Theoretical Physics, Kyoto, Japan

In this talk, we revisit an issue on the definition of energy in a curved spacetime.
For a system invariant  under time-translation, energy is defined as its Noether charge and thus dynamically conserved. For a curved spacetime, however, the energy is not necessary to be conserved since the time-translation invariant is broken in general. Thus, historically, peoples included contributions from gravitational fields to make a total energy conserved, however, by giving up some properties, such as Einstein’s energy from his pseudo-tensor (giving up the general covariance) and quasi-local energies (giving up a local definition of energy), which, after some debates, have been exclusively used so far in general relativity.

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