Seminar @DF-TS - Dr. Suratna Das - Thursday June 27th - CSL / Date & venue changed !

[Rosita Glavina]

  Please note date & venue changed!

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Dr. Suratna Das
Astronomy & Astrophysics Division, Tata Institute of Fundamental 
Research, Mumbay

"CSL as a plausible mechanism for quantum to classical transition of 
primordial perturbations"

Thursday June 27th - 2:30 pm
Euler Lecture Hall, LB

Abstract
Inflationary paradigm not only explains the shortcomings of Big Bang 
cosmology but also provides a mechanism of generation of primordial 
fluctuations which we observe today as large scale structures (LSS) and 
anisotropies in the temperature of CMBR. The fact, that these primordial 
perturbations produced during inflation were quantum in nature and what 
we observe today as LSS and CMBR anisotropy are all classical, raises a 
question as when and how these primordial perturbations become 
classical. Continuous Spontaneous Localization (CSL), a mechanism which 
modifies Schrodinger equation by adding non-linear stochastic terms, 
tries to answer such questions of emergence of classical behavior of 
macroscopic objects in laboratory systems. In this talk we will see how 
a CSL-like mechanism modifies the dynamics of the primordial 
perturbations during inflation and show that within a certain parameter 
range such CSL-like modifications can explain the macro-objectification 
of primordial quantum fluctuation while maintaining the scale-invariance 
of the power spectrum and the phase coherence of super-horizon modes to 
be consistent with present observations like WMAP and PLANCK.