A referee for a recent paper, entitled "Effect of hydrogen bonding on infrared absorption intensity", suggested that we should add "theory" to the title since the chosen title could equally be about an experimental paper. In the end, we declined but did make the abstract clearer that the paper was purely theoretical.
I thought this is an interesting issue, that I had not thought about explicitly before. If you look at titles of papers it is true that it is sometimes not clear whether the paper is theoretical, experimental, or joint theory and experiment. This is particularly true with theory papers with titles such as "Property X of material ABC" or experimental papers with titles such as "Strong electron correlations in materials class Y". To experts who working are on the same topic or who know the authors it may be obvious. But to others, it may not be so obvious.
Does it matter?
Surely if the abstract makes it clear then it is o.k.?
[Again it is amazing how for some abstracts in luxury journals you have to read to practically the last sentence to figure it out. This is because experimental papers can be clothed in theoretical hype].
The suggestion prompted me to do two things.
First, I looked through the titles of most of my papers and found that the only ones which contained "theory" were those which referred to a particular technique, e.g. "Dynamical mean-field theory" or "linear spin wave theory".
Second, I looked at the titles of some famous papers, such as BCS and by P.W. Anderson.
BCS is "Theory of superconductivity" and the abstract begins "A theory...".
PWA does have "theory" in some papers but not others.
The only conclusion I came to from all of this is that I think we should work hard on the titles (and abstracts) of our papers, since the title may determine whether or not they are read.
Maybe it is tangential, but it also reminded me that like Anderson, I am largely against combined theory and experiment papers.
What do you think? Does it matter?