<div dir="ltr"><div dir="ltr"><div id="gmail-m_3807537557354826668gmail-m_-9151122113429567246gmail-m_2327075730106666992gmail-:11h" class="gmail-m_3807537557354826668gmail-m_-9151122113429567246gmail-m_2327075730106666992gmail-ii gmail-m_3807537557354826668gmail-m_-9151122113429567246gmail-m_2327075730106666992gmail-gt gmail-m_3807537557354826668gmail-m_-9151122113429567246gmail-m_2327075730106666992gmail-adP gmail-m_3807537557354826668gmail-m_-9151122113429567246gmail-m_2327075730106666992gmail-adO"><div id="gmail-m_3807537557354826668gmail-m_-9151122113429567246gmail-m_2327075730106666992gmail-:11g" class="gmail-m_3807537557354826668gmail-m_-9151122113429567246gmail-m_2327075730106666992gmail-a3s gmail-m_3807537557354826668gmail-m_-9151122113429567246gmail-m_2327075730106666992gmail-aXjCH gmail-m_3807537557354826668gmail-m_-9151122113429567246gmail-m_2327075730106666992gmail-m15c7d978cdad804f"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div><div style="font-size:13px"><font color="#073763">Ci scusiamo per eventuali <span><span><span><span><span><span><span><span><span class="gmail-m_3807537557354826668gmail-m_-9151122113429567246gmail-m_2327075730106666992gmail-m_-2912847845506457080gmail-m_4906059660557601643gmail-m_-3500574517906286083gmail-il"><span class="gmail-m_3807537557354826668gmail-m_-9151122113429567246gmail-m_2327075730106666992gmail-m_-2912847845506457080gmail-m_4906059660557601643gmail-il"><span class="gmail-m_3807537557354826668gmail-m_-9151122113429567246gmail-m_2327075730106666992gmail-il"><span class="gmail-m_3807537557354826668gmail-m_-9151122113429567246gmail-il">annunci</span></span></span></span></span></span></span></span></span></span></span></span> ripetuti</font></div><div style="font-size:13px"><font color="#073763"><br></font></div><div style="font-size:13px"><font color="#073763">******************************<wbr>******************************<wbr>**********</font></div><div style="font-size:13px"><font color="#073763">CENTRO DI RICERCA MATEMATICA "ENNIO DE <span>GIORGI</span>"</font></div><div style="font-size:13px"><font color="#073763">******************************<wbr>******************************<wbr>**********</font></div><div style="font-size:13px"><br><span style="font-family:arial,helvetica,sans-serif"><font color="#073763"><div style="display:inline" class="gmail_default">Ricordiamo</div> che giovedì 2 Novembre alle ore 14:30 <font size="2">in
Sala Conferenze, Centro di Ricerca Matematica Ennio De Giorgi, Collegio
Puteano, Piazza dei Cavalieri 3, ci sarà il seguente seminario</font></font></span><font size="2"><br><span style="font-family:arial,helvetica,sans-serif"></span></font></div><br><div>Title: <span class="gmail-m_-1426526058297554216gmail-m_3482884787559357428gmail-_5yl5"><span>Parabolic perturbations of unipotent flows</span></span><span style="font-size:12.8px"></span></div><div><br><span style="font-size:12.8px">Speaker: </span><span style="font-size:12.8px">Davide Ravotti (University of Bristol) </span></div><div><span style="font-size:12.8px"><br></span></div><div>Abstract: <span class="gmail-m_-1426526058297554216gmail-m_3482884787559357428gmail-_5yl5"><span>Unipotent flows are
classical examples of parabolic flows, namely flows for which the
divergence of nearby points is polynomial in time. Very little is known
about the ergodic properties of general smooth parabolic flows, even for
smooth perturbations of homogeneous ones, with the only exception of
the case of time-changes. In this talk, I will show that mixing persists
for a class of smooth perturbations of any unipotent flow which are not
time-changes. In particular, we consider certain flows on compact
quotients of SL(3, R) which are obtained by adding to a unipotent flow a
perturbation in a commuting direction. The proof relies on a geometric
shearing mechanism together with a non-homogeneous version of Mautner
Phenomenon.</span></span></div><span style="font-family:arial,helvetica,sans-serif"></span><div style="font-size:13px"><span style="font-family:arial,helvetica,sans-serif"><font color="#073763"><br></font></span></div><div style="font-size:13px"><span style="font-family:arial,helvetica,sans-serif"><font color="#073763">Tutti gli interessati sono invitati a partecipare.</font></span></div><div style="font-size:13px"><span style="font-family:arial,helvetica,sans-serif"><font color="#073763"><br></font></span></div><div style="font-size:13px"><span style="font-family:arial,helvetica,sans-serif"><font color="#073763">Cordiali saluti.</font></span></div><font style="font-size:13px" color="#073763"><span style="font-family:arial,helvetica,sans-serif">Antonella Gregorace</span><span><font color="#888888"><br></font></span></font></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div>