Recent content by asimov42

I should have been more careful, I meant the Hamiltonian - from the paper: "Therefore, the initial state of the fast variables must now be described as a superposition of different energy eigenstates." My understanding was that only one energy eigenstate was allowed in this case, in which all...

Apologies for an additional thread (could not delete the previous one which was not coherent). After reading this paper: https://link.springer.com/article/10.1007/s10701-021-00464-7 "Fast Vacuum Fluctuations and the Emergence of Quantum Mechanics" Gerard ’t Hooft I was struck by a general...

Certainly - but then there should be an expected (predicted) observation. For example, applying a boost in the 'right' direction should make the ground state in the preferred frame look excited in another, no?

Thanks @Demystifier. If one were to do the totally naive thing and introduce a momentum cutoff in the preferred frame, without changing other aspects of the theory, what would one expect to observe?

By 'empty' I mean that the vacuum can only be in the ground state in the preferred frame, correct?

Hi all - related to a question I asked some time ago: If one introduces a momentum cutoff, the result in the most basic case is Lorentz violation. That is, some form of preferred frame must be introduced. I'm wondering what this does to the vacuum state? That is, how does one keep the vacuum...

Actually I would really just like to find a study that compares the genomic damage and mutations in an active (highly simulated) population of neurons with those less active, to compare the effect that neural activity has on DNA. The last sentence from the Cell article that I quoted, "Future...

But if you have a DSB in any neuron at an active transcription site, the risk of a mutation there will affect transcription - thus mutations resulting from incorrectly repaired DSB have a major impact in e.g., Alzheimer's, etc., no?

Hi jim, Thanks - yes, here's one: Topoisomerases and the regulation of neural function Nat Rev Neurosci. 2016 Nov; 17(11): 673–679. Published online 2016 Sep 15. doi: 10.1038/nrn.2016.101 Specifically, I am hoping to find something related to the review article: A Shortcut to...

Hi all, In light of recent findings about Topoisomerase-mediated DNA double strand breaks, I have been looking for a study out there that compares cummulative DNA damage in active neurons vs. less active counterparts. So far I have not been able to find anything - this would hopefully be over a...

Thanks @PeterDonis - understood that we have an isotropic and 'empty' vacuum. Now if I introduce a preferred frame, braking Lorentz invariance, don't I necessarily change the vacuum such that this preferred frame can be identified? (i.e., something has to change w.r.t. particle interaction(s) -...

Where perhaps I should have referred to "content" of the vacuum rather than virtual particle contributions of the vacuum state.

Right - I'm actually wondering specifically about a preferred frame in the vacuum, and whether there's a situation where including the virtual particle contributions from the vacuum leads a different result in, e.g., a scattering experiment or similar.

Perhaps picking one from here: https://arxiv.org/abs/hep-ph/9812418 I don't have a good example in mind, except to ask if there is some theory in which the perturbative expansion changes... (or whether there's a reason why it cannot).

Resurrecting this thread after a long time as another question came up that I was wondering about. I'm probably not going to pose it well, but here's a shot: If Lorentz invariance is violated in some way in quantum gravity, giving a preferred frame, and I carry out the standard perturbative...