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SUMMARY:Fluctuating gravitational field as an explanation for quantum dec
oherence: its implication and detection
DTSTART;VALUE=DATE-TIME:20170321T103000Z
DTEND;VALUE=DATE-TIME:20170321T113000Z
DTSTAMP;VALUE=DATE-TIME:20170924T210134Z
UID:indico-event-5573@cern.ch
DESCRIPTION:The theory of quantum mechanics\, despite being highly success
ful\, is plagued with\n\nfoundational issues such as the “measurement pr
oblem”. Understanding the process of\n\n“measurement” and the random
collapse of the wavefunctions from a more profound\n\nperspective than th
e standard Copenhagen picture have been one of the major aims in\n\nfounda
tional quantum mechanics. Possibilities that the wavefunction collapse is
a\n\nmanifestation of the non-standard coupling of the quantum particles w
ith the background\n\ngravitational field have also been explored in this
context. In this talk\, I will focus on one\n\nsuch proposal called the
“Schrodinger-Newton scheme” in the semi-classical theory of\n\ngravity
. This theory deals with the effect of self-gravity of a quantum particle
on its\n\nwavefunction evolution leading to a spontaneous collapse. Howeve
r\, this is a deterministic\n\ntheory and in order to account for the rand
om outcomes one has to introduce stochasticity\n\nin the evolution equatio
n. I will discuss possible ways to introduce stochasticity in the\n\ndynam
ics by considering separately an external stochastic gravity background an
d by taking\n\ninto account the higher order fluctuation terms to the Schr
odinger-Newton equation itself. I\n\nwill derive the “decoherence time
” in these two cases and show that they match with the\n\npreviously kno
wn “Diosi-Penrose” criterion\, which might be an indication of a unive
rsal\n\nscale at which the interplay of gravity and quantum mechanics beco
mes important. Lastly\, I\n\nwill briefly talk about scenarios where such
effects can be experimentally detected.\n\nhttps://indico.tifr.res.in/indi
co/conferenceDisplay.py?confId=5573
LOCATION:DAA A269
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5573
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