Buonasera,
segnalo che giovedì 12 settembre alle 14.30 in aula seminari Federico 
Alberto Rossi (Università di Perugia) terrà un seminario dal titolo
*Constructing Indefinite Einstein Solvmanifolds Beyond Nilsolitons*
di cui riporto  l'abstract:
In the Riemannian setting, the theory of Einstein solvmanifolds is well 
established and extensively understood. In this seminar, we will 
initially review the Riemannian case, providing a foundation for our 
subsequent exploration of the indefinite setting.
Then, we will switch to indefinite metrics, highlighting with examples 
the differences with the Riemannian case. However, we will describe 
analogous techniques for constructing pseudo-Riemannian Einstein 
solvmanifolds using indefinite nilsolitons, emphasizing the role of 
pseudo-Iwasawa decomposition and nice nilpotent Lie algebras.
Next, we will introduce two distinct methods for constructing Einstein 
solvmanifolds, which are not based on nilsolitons and are unique to the 
indefinite setting. The first approach involves contact symplectic 
reduction, a technique characteristic of pseudo-Sasaki geometry. The 
second, a more recent development, is based on solving the generalized 
nilsoliton equation and presents a new methodological framework. Both 
methods produce examples of Einstein solvmanifolds that are not 
isometric to any of the pseudo-Iwasawa type.
Time permitting, we will also discuss the interplay between Einstein 
solvmanifolds and related geometric structures, such as Sasaki, 
pseudo-Kähler, and para-Kähler geometries.
This presentation is based on joint work with D. Conti and R. Segnan 
Dalmasso.
Per chi fosse interessato ad andare a pranzo con lo speaker ci troveremo 
alle 13 in atrio.
A presto,
Diego