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BEGIN:VEVENT
SUMMARY:no seminar today
DTSTART;VALUE=DATE-TIME:20240213T160000Z
DTEND;VALUE=DATE-TIME:20240213T170000Z
DTSTAMP;VALUE=DATE-TIME:20241013T144041Z
UID:voganish/1
DESCRIPTION:by no seminar today as part of Beyond Voganish\n\nLecture held
in Zoom and MS337.\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/voganish/1/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Sarah Dijols (University of British Columbia)
DTSTART;VALUE=DATE-TIME:20240206T160000Z
DTEND;VALUE=DATE-TIME:20240206T170000Z
DTSTAMP;VALUE=DATE-TIME:20241013T144041Z
UID:voganish/2
DESCRIPTION:Title: Why discrete and tempered Langlands parameters are open\nby Sarah Dij
ols (University of British Columbia) as part of Beyond Voganish\n\nLecture
held in Zoom and MS337.\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/voganish/2/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Mishty Ray (University of Calgary)
DTSTART;VALUE=DATE-TIME:20240220T170000Z
DTEND;VALUE=DATE-TIME:20240220T180000Z
DTSTAMP;VALUE=DATE-TIME:20241013T144041Z
UID:voganish/3
DESCRIPTION:Title: Functoriality of ABV-packets\nby Mishty Ray (University of Calgary) a
s part of Beyond Voganish\n\nLecture held in Zoom and MS337.\nAbstract: TB
A\n
LOCATION:https://researchseminars.org/talk/voganish/3/
END:VEVENT
BEGIN:VEVENT
SUMMARY:José Cruz (University of Calgary)
DTSTART;VALUE=DATE-TIME:20240227T160000Z
DTEND;VALUE=DATE-TIME:20240227T170000Z
DTSTAMP;VALUE=DATE-TIME:20241013T144041Z
UID:voganish/4
DESCRIPTION:Title: Playing around with the function sheaf dictionary and the Fourier Transfo
rm\nby José Cruz (University of Calgary) as part of Beyond Voganish\n
\nLecture held in Zoom and MS337.\n\nAbstract\nIn this talk I will first i
ntroduce Grothendieck’s function sheaf dictionary and show you\nhow we c
an use it to understand perverse sheaves. Then\, we will use the dictionar
y to\nsee how the Fourier transform functor acts on some examples on the g
eometric side of\nVogan’s persepective of the local Langlands correspond
ence.\n
LOCATION:https://researchseminars.org/talk/voganish/4/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Monica Nevins (University of Ottawa)
DTSTART;VALUE=DATE-TIME:20240305T160000Z
DTEND;VALUE=DATE-TIME:20240305T170000Z
DTSTAMP;VALUE=DATE-TIME:20241013T144041Z
UID:voganish/5
DESCRIPTION:Title: Representations of SL(2) near the identity\nby Monica Nevins (Univers
ity of Ottawa) as part of Beyond Voganish\n\nLecture held in Zoom and MS33
7.\n\nAbstract\nThe character of an admissible representation $\\pi$ of a
$p$-adic group $G$ can be expressed\, in a neighbourhood of the identity\,
as a linear combination of functions arising from the finitely many nilpo
tent orbits. In this talk\, we propose an interpretation of the local char
acter expansion as branching rules of the restriction of $\\pi$ to a compa
ct open subgroup and illustrate this explicitly with the example of $\\mat
hrm{SL}(2).$\n
LOCATION:https://researchseminars.org/talk/voganish/5/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Geoff Vooys - Deferred (Mount Allison University)
DTSTART;VALUE=DATE-TIME:20240319T150000Z
DTEND;VALUE=DATE-TIME:20240319T160000Z
DTSTAMP;VALUE=DATE-TIME:20241013T144041Z
UID:voganish/6
DESCRIPTION:Title: Equivariant Beilinson's Theorem and Extensions of Equivariant Perverse Sh
eaves\nby Geoff Vooys - Deferred (Mount Allison University) as part of
Beyond Voganish\n\nLecture held in Zoom and MS337.\n\nAbstract\nBeilinson
's Theorem is an important theorem in algebraic geometry that says there i
s a triangulated equivalence of categories $D^bc(X\;\\overline{\\mathbb{Q}
}{\\ell}) \\simeq D^b(\\mathbf{Perv}(X\;\\overline{\\mathbb{\\Q}}{\\ell}))
$ fixing the category of perverse sheaves for any variety $X$ over an alge
braically closed field $K$ with $\\ell$ a positive integer prime distinct
from the characteristic of $K$. While a result of fundamental importance\,
as it allows the computation of extensions between perverse sheaves in th
e derived category on $X$ to be performed in their own bounded derived cat
egory\, the equivariant version of this result has been elusive and known
in general only for complex varieties with actions by finite complex algeb
raic groups. In this talk I'll discuss a general proof for an equivariant
version of Beilinson's Theorem\, i.e.\,a triangulated equivalence $D^b_G(
X\;\\overline{\\mathbb{Q}}{\\ell}) \\simeq D^bG(\\mathbf{Perv}(X\;\\overli
ne{\\mathbb{Q}}{\\ell}))$ which fixes the category of equivariant perverse
sheaves valid for any variety equipped with an action by a smooth algebra
ic group $G$ over a field $K$. Afterwards I'll give a short discussion as
well about what this means for equivariant extensions between equivariant
perverse sheaves.\n
LOCATION:https://researchseminars.org/talk/voganish/6/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Chi-Heng Lo (Purdue)
DTSTART;VALUE=DATE-TIME:20240312T150000Z
DTEND;VALUE=DATE-TIME:20240312T160000Z
DTSTAMP;VALUE=DATE-TIME:20241013T144041Z
UID:voganish/7
DESCRIPTION:Title: An upper bound for wavefront sets of admissible representations of p-adic
groups\nby Chi-Heng Lo (Purdue) as part of Beyond Voganish\n\nLecture
held in Zoom and MS337.\n\nAbstract\nThe Vogan conjecture states that loc
al Arthur packets match ABV-packets for L-parameters of Arthur type. Thus\
, it is expected that the properties of local Arthur packets should hold f
or the corresponding ABV-packets\, and vice versa. In the first part of th
is talk\, I will recall some basic properties of these packets\, and state
the closure ordering conjecture on local Arthur pacekts and Aubert-Zelevi
nsky dual conjecture on ABV-packets. In the second part\, I will introduce
a new conjecture on upper bounds of wavefront set\, Jiang's conjecture on
wavefront set for local Arthur packets and for ABV-packets. I will show t
hat these three conjectures are all equivalent assuming the two conjecture
s in the first part hold\, and reduce these conjectures to the anti-discre
te case. This is a joint work with Alexander Hazeltine\, Baiying Liu and F
reydoon Shahidi.\n
LOCATION:https://researchseminars.org/talk/voganish/7/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Geoff Vooys (Mount Allison University)
DTSTART;VALUE=DATE-TIME:20240326T150000Z
DTEND;VALUE=DATE-TIME:20240326T160000Z
DTSTAMP;VALUE=DATE-TIME:20241013T144041Z
UID:voganish/8
DESCRIPTION:Title: Equivariant Beilinson's Theorem and Extensions of Equivariant Perverse Sh
eaves\nby Geoff Vooys (Mount Allison University) as part of Beyond Vog
anish\n\nLecture held in Zoom and MS337.\n\nAbstract\nBeilinson's Theorem
is an important theorem in algebraic geometry that says there is a triangu
lated equivalence of categories $D^bc(X\;\\overline{\\mathbb{Q}}{\\ell}) \
\simeq D^b(\\mathbf{Perv}(X\;\\overline{\\mathbb{\\Q}}{\\ell}))$ fixing th
e category of perverse sheaves for any variety $X$ over an algebraically c
losed field $K$ with $\\ell$ a positive integer prime distinct from the ch
aracteristic of $K$. While a result of fundamental importance\, as it allo
ws the computation of extensions between perverse sheaves in the derived c
ategory on $X$ to be performed in their own bounded derived category\, the
equivariant version of this result has been elusive and known in general
only for complex varieties with actions by finite complex algebraic groups
. In this talk I'll discuss a general proof for an equivariant version of
Beilinson's Theorem\, i.e.\,a triangulated equivalence $D^b_G(X\;\\overli
ne{\\mathbb{Q}}{\\ell}) \\simeq D^bG(\\mathbf{Perv}(X\;\\overline{\\mathbb
{Q}}{\\ell}))$ which fixes the category of equivariant perverse sheaves va
lid for any variety equipped with an action by a smooth algebraic group $G
$ over a field $K$. Afterwards I'll give a short discussion as well about
what this means for equivariant extensions between equivariant perverse sh
eaves.\n\nI'll try to keep the category theory in this talk to as gentle a
level as possible and at as understandable a level as possible as well\,
so please ask questions as we go!\n
LOCATION:https://researchseminars.org/talk/voganish/8/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Leticia Barchini - Postponed (Oklahoma State University)
DTSTART;VALUE=DATE-TIME:20240429T150000Z
DTEND;VALUE=DATE-TIME:20240429T160000Z
DTSTAMP;VALUE=DATE-TIME:20241013T144041Z
UID:voganish/9
DESCRIPTION:Title: Relations between Kazhdan-Lusztig polynomials for real and p-adic groups<
/a>\nby Leticia Barchini - Postponed (Oklahoma State University) as part o
f Beyond Voganish\n\nLecture held in Zoom and MS337.\n\nAbstract\nWe relat
e certain Kazhdan-Lusztig polynomials that arise in the representation\nth
eory of real and $p$-adic groups. The polynomials encode the multiplicity
of irreducible\nrepresentations in standard ones. In both\, the real and p
-adic setting\, there are relevant\ngeometric parameters that index both i
rreducible and standard modules. I will briefly\nreview the geometric sett
ing. Next\, I will discuss earlier contributions by Zelevinski and\nby Ciu
botaru-Trapa. In presenting new results\, I will emphasize examples. I wil
l explain\nhow\, under assumptions\, these results imply that the decompos
ition matrix for a class of\nunipotent representation of split $p$-adic gr
oups is a submatrix of the decomposition matrix\nof representations of spl
it real groups.\n
LOCATION:https://researchseminars.org/talk/voganish/9/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Elad Zelingher (University of Michigan)
DTSTART;VALUE=DATE-TIME:20240507T150000Z
DTEND;VALUE=DATE-TIME:20240507T160000Z
DTSTAMP;VALUE=DATE-TIME:20241013T144041Z
UID:voganish/10
DESCRIPTION:Title: Kloosterman sums in representation theory of $GL(n\, \\mathbb{F}_q)$.\nby Elad Zelingher (University of Michigan) as part of Beyond Voganish\n
\nLecture held in Zoom and MS337.\n\nAbstract\nGiven a "nice" irreducible
representation of $GL(n\, \\mathbb{F}_q)$\, one can define a special matri
x coefficient attached to it\, called the Bessel function. Often Kloosterm
an sums show up as special values of these Bessel functions. In this talk\
, I will first explain my previous results regarding special values of Bes
sel functions of generic representations. I will then talk about my joint
work with Oded Carmon regarding special values of Bessel functions associa
ted to Speh representations and their relation to matrix Kloosterman sums.
\n
LOCATION:https://researchseminars.org/talk/voganish/10/
END:VEVENT
BEGIN:VEVENT
SUMMARY:No seminar
DTSTART;VALUE=DATE-TIME:20240430T150000Z
DTEND;VALUE=DATE-TIME:20240430T160000Z
DTSTAMP;VALUE=DATE-TIME:20241013T144041Z
UID:voganish/11
DESCRIPTION:by No seminar as part of Beyond Voganish\n\nLecture held in Zo
om and MS337.\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/voganish/11/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Mathilde Gerbelli-Gauthier (McGill University)
DTSTART;VALUE=DATE-TIME:20240423T150000Z
DTEND;VALUE=DATE-TIME:20240423T160000Z
DTSTAMP;VALUE=DATE-TIME:20241013T144041Z
UID:voganish/12
DESCRIPTION:Title: Counting non-tempered automorphic forms using endoscopy\nby Mathilde
Gerbelli-Gauthier (McGill University) as part of Beyond Voganish\n\nLectu
re held in Zoom and MS337.\n\nAbstract\nHow many automorphic representatio
ns of level n have a specified local factor at the infinite places? When t
his local factor is a discrete series representation\, this question is as
ymptotically well-undersertood as n grows. Non-tempered local factors\, on
the other hand\, violate the Ramanujan conjecture and should be very rare
. We use the endoscopic classification for representations to quantify thi
s rarity in the case of cohomological representations of unitary groups\,
and discuss some applications to the growth of cohomology of Shimura varie
ties\n
LOCATION:https://researchseminars.org/talk/voganish/12/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Leticia Barchini (Oklahoma State University)
DTSTART;VALUE=DATE-TIME:20240514T150000Z
DTEND;VALUE=DATE-TIME:20240514T160000Z
DTSTAMP;VALUE=DATE-TIME:20241013T144041Z
UID:voganish/13
DESCRIPTION:Title: Relations between Kazhdan-Lusztig polynomials for real and p-adic groups
\nby Leticia Barchini (Oklahoma State University) as part of Beyond Vo
ganish\n\nLecture held in Zoom and MS337.\n\nAbstract\nWe relate certain K
azhdan-Lusztig polynomials that arise in the representation\ntheory of rea
l and $p$-adic groups. The polynomials encode the multiplicity of irreduci
ble\nrepresentations in standard ones. In both\, the real and p-adic setti
ng\, there are relevant\ngeometric parameters that index both irreducible
and standard modules. I will briefly\nreview the geometric setting. Next\,
I will discuss earlier contributions by Zelevinski and\nby Ciubotaru-Trap
a. In presenting new results\, I will emphasize examples. I will explain\n
how\, under assumptions\, these results imply that the decomposition matri
x for a class of\nunipotent representation of split $p$-adic groups is a s
ubmatrix of the decomposition matrix\nof representations of split real gro
ups.\n
LOCATION:https://researchseminars.org/talk/voganish/13/
END:VEVENT
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