Talk:Causal sets

message: Shouldn't the definition of geodesic, currently "The length of the chain, n, is maximal over all chains from x\, to y\,." be "minimal" instead?
:It depends on the signature you adopt for Minkowski Space - if [1, -1, -1, -1] then maximal corresponds to not swanning about in space. The causal property prevents you swanning about in time.
75.67.249.169 (talk) 23:40, 23 October 2012 (UTC)
replies: text: We're not talking about the length in Minkowski space, n is simply the number of links in the chain. What does the metric have to do with it?  — Preceding unsigned comment added by 130.216.209.138 (talk) 03:01, 28 June 2013 (UTC)

text: No.  Maximal is correct. The shortest chains will generically have length 3, and will traverse a spatial distance comparable to the temporal separation between x and y. DavidRideout (talk) 23:15, 14 August 2018 (UTC)
thread_title: Geodesics

message: Russell and Whitehead's theory of space-time, called "eventism," reduces to the theory of causal sets when it is constrained to finite sets of events.  Causal sets form relative frequencies, which leads directly to the definition of mass-energy in accord with Planck's E=hf.  Each "causal link" is then a quantum.  Fundamental particles, including the electron, neutrino, proton and neutron, have been modeled by Carey R. Carlson as simple causal sets.
This paragraph was moved from the main causal set article because it is unclear (e.g. "Each causal link is then a quantum"??), unsourced (e.g Where's a reference for Russell and Whitehead's eventism theory? Carey R. Carlson's work?) and contains incorrect statements (e.g. the proton and neutron are not fundamental particles - see quarks). StevenJohnston (talk) 13:46, 22 February 2008 (UTC)
thread_title: Relevant?

message: On http://www.phy.olemiss.edu/~luca/Topics/c/causal_sets.html you find the following definition:
Causal set: A (locally) finite partially ordered set, in which the order is causally interpreted.
See also the nlab entry http://ncatlab.org/nlab/show/causet. 
HansBlatter (talk) 11:39, 21 October 2009 (UTC)
thread_title:  Partial orders are REFLEXIVE (not irreflexive) 

message: There is a problem with the definition of length of chains. x0<x1 is length 1, if it is correct that the length is the number of relations in the chain, but according to the given enumeration (x0 ...x(n-1)) and the statement that the length is the value of n, we get a length of 2.! 
75.67.249.169 (talk) 12:30, 23 October 2012 (UTC)
replies: text: No, the definition is consistent, in your example  (that is, x0<x1)  n is 1.Paolo Lipparini (talk) 10:15, 10 September 2014 (UTC)
thread_title:  Length of Chains 

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thread_title:  External links modified (January 2018) 

message: I don't want to say anything definitive, because it's possible I haven't fully understood the Kastner article, but I can't help but question not only the relevance, but also the validity of what is being proposed. Not only has the article gone all but unnoticed by anybody working on causal sets (and the physics community at large, for that matter), but the paper appears to make very little contribution to the field. It is explicitly not peer reviewed.
The arguments are only sparsely reinforced by mathematical formalism and some phrases that are used seem to be quite frankly fictitious. The premise of the article is a hotly debated topic elsewhere with all but exactly two persons standing behind it, only one of whom holds physics credentials. The contents of the paper offer nothing that may be used by researchers to advance the study of causal set dynamics, making the claims borderline unfalsifiable. On several occasions, the author redefines or blatantly ignores axioms that are essential to the theory in the absence of an alternative justification and never indicates that they are doing so.
Had it not been for the preceding issues, then the author's questionable credentials would be an inappropriate subject matter, but unfortunately they are.
Developing a quantum dynamics for causal set theory has been an issue for decades, and there are many physicists hard at work trying to develop them. It is frankly disrespectful towards these researchers to make the bombastic claim that such a flippant article "can provide the quantum dynamics for the causal set." It is unthinkable that this section would include Kastner's article while making no mention of the work of Benincasa, Dowker, Surya, and Glaser in this direction.
I am adding tags for the time being, and unless the theory can be attested to by someone other than Kastner, it should be removed from this article. At the very least, it constitutes a no original research issue.
AndersLeo (talk) 17:46, 4 June 2018 (UTC)
thread_title:  Verifiability of Kastner Article? 

message: How about Einstein manifold and Causal sets? Is there any preference/prevalence over the manifold of Einstein-Cartan theory? Or is Einstein-Cartan theory also compatible with Causal sets? --Ernsts (talk) 22:43, 6 June 2022 (UTC)
thread_title:  Einstein Manifold