I will be traveling the rest of the week to give a lecture at the Sussex graduate school "From Classical to Quantum GR", so not much will happen on this blog. For the school, we were asked for discussion topics related to our lectures, below are my suggestions. Leave your thoughts in the comments, additional suggestions for topics are also welcome.
- Is it socially responsible to spend money on quantum gravity research? Don't we have better things to do? How could mankind possibly benefit from quantum gravity?
- Can we make any progress on the theory of quantum gravity without connection to experiment? Should we think at all about theories of quantum gravity that do not produce testable predictions? How much time do we grant researchers to come up with predictions?
- What is your favorite approach towards quantum gravity? Why? Should you have a favorite approach at all?
- Is our problem maybe not with the quantization of gravity but with the foundations of quantum mechanics and the process of quantization?
- How plausible is it that gravity remains classical while all the other forces are quantized? Could gravity be neither classical nor quantized?
- How convinced are you that the Planck length is at 10-33cm? Do you think it is plausible that it is lower? Should we continue looking for it?
- What do you think is the most promising area to look for quantum gravitational effects and why?
- Do you think that gravity can be successfully quantized without paying attention to unification?