I found an old MOF post about representations attached to p-adic modular forms: [Representations attached to p-adic modular forms](https://mathoverflow.net/questions/108350/representations-attached-to-p-adic-modular-forms) and I have some follow up questions on the same topic.


If we have a classical form of weight k, it is know that the p-adic representation attached to the form is crystalline if p does not divide the level. It is de Rham in general and it has Hodge-Tate weights 0 and k-1.


My question is that if the form is not classical, then the weight is not an integer. Is this representation crystalline or de Rham? Can we say something about the Hodge-Tate weights?



Properties of representations attached to p-adic modular forms
There are two subtleties regarding how to formulate this question.


Firstly, there are several notions of "p-adic modular form". There's Hida's ordinary p-adic modular forms (a very small space); there's Coleman's overconvergent p-adic modular forms (a much bigger space); and there's Serre and Katz's space of p-adic modular forms, which is a *vastly* bigger space (too big to have a reasonable theory of eigenforms).


The second subtlety is that for the latter two definitions (Coleman or Serre-Katz) it is *not true* that a non-classical form has non-integer weight; there are non-classical forms of integer weight (lots of them).


With that out of the way: if f is in any of these spaces and its weight is non-integral, then the associated Galois representation isn't even Hodge--Tate, so it's certainly not de Rham or crystalline. The eigenvalues of its Sen operator are what they should be, i.e. 0 and $k - 1$ where $k$ is the weight (but you have to be careful what this means!).


If $f$ is of integer weight and it's ordinary, then it's classical and the local representation is de Rham. If it's overconvergent and has finite slope (i.e. defines a point on the eigencurve), then it might be non-classical, in which case then the local Galois rep is Hodge--Tate (with weights 0 and $k-1$), but it is never de Rham; this is a theorem of Kisin, from his big paper "Overconvergent modular forms and the Fontaine-Mazur conjecture". Kisin's work also shows that if $f$ is an overconvergent finite-slope non-classical eigenform, then $\mathbf{D}\_{\mathrm{cris}}V\_p(f)$ is 1-dimensional (and this crystalline period varies analytically in families). 


As for the case of infinite-slope non-classical eigenforms, or non-overconvergent eigenforms, I don't know.


