I don’t think the specific part of decision theory where people argue over Newcomb’s problem is large enough as a field to be subject to the EMH. I don’t think the incentives are awfully huge either. I’d compare it to ordinal analysis, a field which does have PhDs but very few experts in general and not many strong incentives. One significant recent result (if the proof works then the ordinal notation in question would be most powerful proven well-founded) was done entirely by an amateur building off of work by other amateurs (see the section on Bashicu Matrix System): https://cp4space.hatsya.com/2023/07/23/miscellaneous-discoveries/
I don’t think the specific part of decision theory where people argue over Newcomb’s problem is large enough as a field to be subject to the EMH. I don’t think the incentives are awfully huge either. I’d compare it to ordinal analysis, a field which does have PhDs but very few experts in general and not many strong incentives. One significant recent result (if the proof works then the ordinal notation in question would be most powerful proven well-founded) was done entirely by an amateur building off of work by other amateurs (see the section on Bashicu Matrix System): https://cp4space.hatsya.com/2023/07/23/miscellaneous-discoveries/