Negative moments of the CREM partition function in the high temperature regime

Abstract

The continuous random energy model (CREM) was introduced by Bovier and Kurkova in 2004 which can be viewed as a generalization of Derrida's generalized random energy model. Among other things, their work indicates that there exists a critical point ${\beta }_c$ such that the partition function exhibits a phase transition. The present work focuses on the high temperature regime where $\beta <{\beta }_c$. We show that for all $\beta <{\beta }_c$ and for all $s>0$, the negative $s$ moment of the CREM partition function is comparable with the expectation of the CREM partition function to the power of $-s$, up to constants that are independent of $N$.

Major revision; this version: 21 pages. Key changes include: updated choice of K and definition of eps_k ; added statements for many-to-one/many-to-two and the exponential tilting; revised moment estimates and proof of Proposition 2