Xiang Zhengyu author Columbia University. Mathematics Urban Eric Jean-Paul thesis advisor Columbia University. Mathematics Columbia University. Mathematics originator text Dissertations 2012 English For an arbitrary reductive group G, we construct the full eigenvariety E, which parameterizes all p-adic overconvergent cohomological eigenforms of G in the sense of Ash-Stevens and Urban. Further, given an algebraic automorphism a of G, we construct the twisted eigenvariety E^a, a rigid subspace of E, which parameterizes all eigenforms that are invariant under a. In particular, in the case G = GLn, we prove that every self-dual automorphic representation can be deformed into a family of self-dual cuspidal forms containing a Zariski dense subset of classical points. This is the inverse of Ash-Pollack-Stevens conjecture. We also give some hint to this conjecture. Ph.D., Columbia University. Mathematics http://hdl.handle.net/10022/AC:P:13124 NNC NNC 2012-05-03 14:44:03 -0400 2012-05-03 14:50:56 -0400 7127 eng