I have stumbled across [a related question](https://mathoverflow.net/q/87430/30186) asking which large cardinal properties can hold for $\aleph\_1$. [This question](https://mathoverflow.net/q/45448/30186) is probably also related, asking in what ways $\aleph\_0$ is a "large" cardinal.


To state my question:



> 
> For which large cardinal properties is it consistent with ZFC that $\frak{c}$, the cardinality of continuum, has this property? How does the answer change if we abandon choice?
> 
> 
> 


Here are results I'm aware of:


* $\frak{c}$ can be real-valued measurable (relative to existence of a measurable cardinal), which [apparently](https://en.wikipedia.org/wiki/Measurable_cardinal#Real-valued_measurable) implies it's weakly Mahlo. I believe all of these hold in ZFC.
* Possibility of $\frak{c}$ being weakly inaccessible and weakly Mahlo (or, I believe, weakly 1-inaccessible or whatever intermediate condition we put on it) is also consistent relative to existence of respective cardinals, which can be established by forcing which doesn't disrupt in any way structure of ordinals, only the size of continuum.
* Clearly $\frak{c}$ can't be strongly inaccessible or strongly Mahlo, because these directly require a cardinal to be strongly limit.
* In ZFC, every measurable is strongly limit, so $\frak{c}$ can't be measurable. But it is also true in ZF, because we have $\aleph\_0<\frak{c}$ and $2^{\aleph\_0}\geq\frak{c}$, and standard proof that this can't happen for measurable goes through.
* By same means, $\frak{c}$ can't be the critical point of any elementary embedding, so it can't land in any of the higher entries of large cardinals list.
* [Continuum can't be weakly compact](https://mathoverflow.net/a/32080/30186) since weak compactness implies strong limitness. I'm sure this is true in ZFC, but not sure about ZF.


What other properties can or can't continuum have? I believe axiom of choice disallows it to be in anywhere above weakly compact (correct me if I'm wrong), but I have hopes for ZF itself giving $\frak{c}$ more possibilites to be large.


Thank you in advance.



What sort of large cardinal can continuum be?
Let me add a few examples:


**(1)** If we start with a supercompact cardinal $\kappa$, and force with $Add(\omega, \kappa)$, then in the extension the cardinal $\kappa=2^\omega$ becomes generically supercompact. The same holds for many other large cardinals.


**(2)** If we start with a weakly compact cardinal, we can find a generic extension in which $2^\omega=\kappa$ is (the least) weakly Mahlo, and tree property holds at $\kappa.$ This result is due to Boos ``[Boolean extensions which efface the Mahlo property](http://journals.cambridge.org/action/displayAbstract?fromPage=online&aid=9102094&fileId=S0022481200064422)''.


**(3)** The consistency of the theory $ZFC$+ "there is a supercompact cardinal'' implies the consistency of the theory $ZFC$ + "there exist a uniform measure $μ$ on the cardinal $2^ω$ and a set $X⊆2^ω$ of positive $μ$-measure such that for every $y∈X$ there is a uniform measure on $y$ which is $|y|$-additive.''


**(4)** The consistency of the theory $ZFC$+ "there is a measure concentrating on compact cardinals'' implies the consistency of the theory $ZFC$ + "there exist a uniform measure $μ$ on the cardinal $2^ω$ and a set $X⊆2^ω$ of positive $μ$-measure such that for every $y∈X$ there is a uniform measure on $2^ω$ which is $|y|$-additive.''


For (3) and (4) see [Some combinatorial properties of measures](http://link.springer.com/chapter/10.1007%2FBFb0072603)


**(5)** Under $PFA, 2^\omega=\aleph\_2$ has some large cardinal properties.


