Hi there

 

We have a seminar this week:

 

Seth Lloyd

 

Wednesday 6/2/2008 at 14.30.

 

IMS seminar room.

 

Non-quantum gravity

 

The application of concepts of quantum information to the problem of measuring spacetime geometry suggests that the spacetime metric should not be quantized.  Instead, what is quantum are the clocks and signals that determine the metric.

This talk presents a non-quantum theory of gravity.

In this theory, intervals of space and time are derived from the states of quantum fields: the metric itself is not quantized.

In non-quantum gravity, gravitational fields inherit the quantum fluctuations of the underlying quantum fields, leading to a systematic treatment of the back-reaction problem.  The theory makes concrete predictions: in particular, the non-quantum gravitational fields do not exhibit independent zero-point fluctuations, predicting a suppression of tensor modes of the cosmic microwave background.

 

Although the talk deals with quantum gravity, it will be accessible to anyone with a background in quantum information, too.

 

 

 

 

Best,

 

Alex.