Weingarten calculus and the IntHaar package for integrals over compact matrix groups

Asymptotics of Matrix Integrals and Tensor Invariants of Compact Lie Groups

Abstract. In this paper we give an asymptotic formula for a matrix integral which plays a crucial role in the approach of Diaconis et al. to random matrix eigenvalues. The choice of parameter for the asymptotic analysis is motivated by an invariant theoretic interpretation of this type of integral. For arbitrary regular irreducible representations of arbitrary connected semisimple compact Lie g...

The Orthogonal Weingarten Formula in Compact Form

We present a compact formulation of the orthogonal Weingarten formula, with the traditional quantity I(i1, . . . , i2k : j1, . . . , j2k) = ∫ On ui1j1 . . . ui2kj2k du replaced by the more advanced quantity I(a) = ∫ On Πu aij ij du, depending on a matrix of exponents a ∈ Mn(N). Among consequences, we establish a number of basic facts regarding the integrals I(a): vanishing condition, sign, poss...

Integration over Compact Quantum Groups

We find a combinatorial formula for the Haar functional of the orthogonal and unitary quantum groups. As an application, we consider diagonal coefficients of the fundamental representation, and we investigate their spectral measures. Introduction A basic question in functional analysis is to find axioms for quantum groups, which ensure the existence of a Haar measure. In the compact case, this ...

fixed point property for banach algebras associated to locally compact groups

در این پایان نامه به بررسی خاصیت نقطه ثابت و خاصیت نقطه ثابت برای نیم گروههای برگشت پذیر چپ روی بعضی جبرهای باناخ از جمله جبر فوریه و جبر فوریه استیلتیس پرداخته شده است. برای مثال بیان شده است که اگر گروه یک گروه فشرده موضعی با همسایگی فشرده برای عنصر همانی که تحت درونریختی ها پایاست باشد آنگاه جبر فوریه و جبر فوریه استیلتیس دارای خاصیت نقطه ثابت برای نیم گروه های برگشت پذیر چپ است اگر و تنها ا...

2-matrix versus complex matrix model, integrals over the unitary group as triangular integrals