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BEGIN:VEVENT
SUMMARY:Gregório Pacelli Bessa (Universidade Federal do Ceará)
DTSTART:20200417T200000Z
DTEND:20200417T210000Z
DTSTAMP:20260404T110959Z
UID:SGFM/1
DESCRIPTION:Title: Green function and Dirichlet spectrum.\nby Gregório Pacelli Bessa
(Universidade Federal do Ceará) as part of Seminario de Geometría y Fí
sica - Matemática UCN-USP\n\n\nAbstract\nIn this talk\, we show that the
first eigenvalue $\\lambda_1(\\Omega)$ of the Laplacian of a bounded domai
n with smooth boundary can be obtained by S. Sato's iteration scheme of th
e Green operator.\nWe also prove an identity relating the radial eigenvalu
es of a geodesic ball centered at the origin $B_r$ for a model manifold $M
_h^n$ of an isoperimetric quotient.\n\nThese results are joint work with
Vicent Gimeno (Casteló\, Spain) and Luquesio Jorge (UFC\, Brazil).\n
LOCATION:https://stable.researchseminars.org/talk/SGFM/1/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Chris Woodward (Rutgers University)
DTSTART:20200430T200000Z
DTEND:20200430T210000Z
DTSTAMP:20260404T110959Z
UID:SGFM/2
DESCRIPTION:Title: Fukaya categories and blow-ups\nby Chris Woodward (Rutgers Univers
ity) as part of Seminario de Geometría y Física - Matemática UCN-USP\n\
n\nAbstract\nI will talk about joint work with Sushmita Venugopalan and Gu
angbo Xu describing the Fukaya category of the blow-up of a symplectic man
ifold at a point.\n
LOCATION:https://stable.researchseminars.org/talk/SGFM/2/
END:VEVENT
BEGIN:VEVENT
SUMMARY:José Figueroa-O'Farrill (University of Edinburgh)
DTSTART:20200514T200000Z
DTEND:20200514T210000Z
DTSTAMP:20260404T110959Z
UID:SGFM/3
DESCRIPTION:Title: Supersymmetry and Lie algebra deformations\nby José Figueroa-O'Fa
rrill (University of Edinburgh) as part of Seminario de Geometría y Físi
ca - Matemática UCN-USP\n\n\nAbstract\nI will summarise recent work in co
llaboration with Andrew Beckett\, Paul de Medeiros\, and Andrea Santi conc
erning the generalised Spencer cohomology of Lie superalgebras and its app
lication to the classification problem of supersymmetric supergravity back
grounds and to the construction of supersymmetric field theories in curved
space. I will not assume any prior knowledge of supergravity or supersym
metric field theories.\n
LOCATION:https://stable.researchseminars.org/talk/SGFM/3/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Marcos Jardim (Universidade Estadual de Campinas)
DTSTART:20200528T200000Z
DTEND:20200528T210000Z
DTSTAMP:20260404T110959Z
UID:SGFM/4
DESCRIPTION:Title: Complex instantons\nby Marcos Jardim (Universidade Estadual de Cam
pinas) as part of Seminario de Geometría y Física - Matemática UCN-USP\
n\n\nAbstract\nI will ADHM-like description of non-singular\, anti-self-du
al connections on the euclidean space with gauge group $\\mathrm{SL}(2\,\\
mathbb{C})$\, based on a complexified version of the ADHM equations. I wil
l also discuss how these complex instantons relate to torsion free sheaves
on the twistor space.\n
LOCATION:https://stable.researchseminars.org/talk/SGFM/4/
END:VEVENT
BEGIN:VEVENT
SUMMARY:M. Pilar García del Moral (Universidad de Antofagasta)
DTSTART:20200611T200000Z
DTEND:20200611T210000Z
DTSTAMP:20260404T110959Z
UID:SGFM/5
DESCRIPTION:Title: Fluxes\, Twisted Tori\, Monodromy and $U(1)$ supermembranes\nby M.
Pilar García del Moral (Universidad de Antofagasta) as part of Seminario
de Geometría y Física - Matemática UCN-USP\n\n\nAbstract\nIn this talk
I will discuss about recent advances in the characterization of Supermemb
rane Theory with constant fluxes. I will show that the $D=11$ Supermembran
e theory (M2-brane) compactified on a $M_9\\times T^2$ target space\, with
constant fluxes $C_\\pm$ naturally incorporates the geometrical structure
of a twisted torus. Its global formulation corresponds to a twisted torus
bundle fibered over the world volume of the supermembrane. This structure
allows to understand better its effective limit described by the Type II
Gauged supergravities. The spectrum of the theory is purely discrete\, wi
th finite multiplicity. The theory is invariant under symplectomorphisms c
onnected and non-connected to the identity\, a result relevant to guarante
e the U-dual invariance of the theory. The Hamiltonian of the theory exhib
its interesting new $U(1)$ gauge and global symmetries on the world volume
induced by the symplectomorphism transformations. I will discuss also its
supersymmetric algebra. The zero modes decouple from the nonzero ones. T
he nonzero mode algebra corresponds to a massive superalgebra that preserv
es either $1/2$ or $1/4$ of the original supersymmetry depending on the st
ate considered.\n\nThis talk is based on:\n\n1.Fluxes\, Twisted tori\, Mon
odromy and $U(1)$ Supermembranes. arXiv: 2005.06397\n By MPGM\, Camilo Las
Heras\, Pablo León\, Joselen Peña and Alvaro Restuccia.\n\n2. M2-brane
s in a constant flux background. Physics Letters B\, 797\, 2019.\nBy MPGM\
, Camilo Las Heras\, Pablo León\, Joselen Peña and Alvaro Restuccia.\n
LOCATION:https://stable.researchseminars.org/talk/SGFM/5/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Nuno Cardoso (University of Miami)
DTSTART:20200625T200000Z
DTEND:20200625T210000Z
DTSTAMP:20260404T110959Z
UID:SGFM/6
DESCRIPTION:Title: Towards a new technique to compute the Orlov spectrum\nby Nuno Car
doso (University of Miami) as part of Seminario de Geometría y Física -
Matemática UCN-USP\n\n\nAbstract\nA generator of a triangulated category
is an object from which we can obtain the whole category through certain o
perations. Associated to a generator\, there is the notion of the generati
on time\, which is the number describing how long the rebuilding process t
akes. The generation time of the fastest generator is called the Rouquier
dimension of the category and it is conjectured that the Rouquier dimensio
n of the derived category of a smooth projective variety of dimension $n$
is exactly $n$. Orlov suggested that in order to extract additional geomet
ric information from the category\, one should study all possible generati
on times – the Orlov spectrum. Later\, Ballard\, Favero\, and Katzarkov
developed considerably our understanding of the topic\, making connections
to rationality\, computing the Orlov spectrum in several cases and findin
g bounds for it. In this talk\, we will review part of their results and d
iscuss our work in progress on a new technique to compute the Orlov spectr
um\, which takes inspiration on Abouzaid's criterion for generating the Fu
kaya category in terms of open-closed maps.\n
LOCATION:https://stable.researchseminars.org/talk/SGFM/6/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Mark Gross (University of Cambridge)
DTSTART:20200709T183000Z
DTEND:20200709T200000Z
DTSTAMP:20260404T110959Z
UID:SGFM/7
DESCRIPTION:Title: Intrinsic Mirror Symmetry\nby Mark Gross (University of Cambridge)
as part of Seminario de Geometría y Física - Matemática UCN-USP\n\n\nA
bstract\nI will talk about joint work with Bernd Siebert\, proposing a\nge
neral mirror construction for log Calabi-Yau pairs\, i.e.\, a pair $(X\,D)
$\nwith $D$ a "maximally degenerate" boundary divisor and $K_X+D=0$\, and
for\nmaximally unipotent degenerations of Calabi - Yau manifolds. We accom
plish\nthis by constructing the coordinate ring or homogeneous coordinate
ring\nrespectively in the two cases\, using certain kinds of Gromov-Witten
\ninvariants we call "punctured invariants"\, developed jointly with\nAbra
movich and Chen.\n
LOCATION:https://stable.researchseminars.org/talk/SGFM/7/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Koushik Ray (Indian Association for the Cultivation of Science)
DTSTART:20200723T183000Z
DTEND:20200723T200000Z
DTSTAMP:20260404T110959Z
UID:SGFM/8
DESCRIPTION:Title: Conformal Correlation functions in four dimensions from Quaternionic L
auricella system\nby Koushik Ray (Indian Association for the Cultivati
on of Science) as part of Seminario de Geometría y Física - Matemática
UCN-USP\n\n\nAbstract\nI shall discuss how the correlation functions in Eu
clidean conformal field theories in four dimensions are expressed as repre
sentations of the conformal group $SL(2\,\\mathbb H)$\, $\\mathbb H$ being
the field of quaternions\, on the configuration space of points. The repr
esentations are obtained in terms of Lauricella system\nfor quaternions\,
generalizing the two-dimensional counterpart where the correlation functio
ns pertain to the group $\\mathrm{SL}(2\,\\mathbb C)$.\n
LOCATION:https://stable.researchseminars.org/talk/SGFM/8/
END:VEVENT
BEGIN:VEVENT
SUMMARY:J. Sebastián Báez (Universidade Estadual de Campinas)
DTSTART:20200910T190000Z
DTEND:20200910T200000Z
DTSTAMP:20260404T110959Z
UID:SGFM/9
DESCRIPTION:Title: Coadjoint semi-direct orbit andsymplectic Deformations\nby J. Seba
stián Báez (Universidade Estadual de Campinas) as part of Seminario de G
eometría y Física - Matemática UCN-USP\n\n\nAbstract\nGiven a non-compa
ct semisimple Lie algebra $\\mathfrak{g}$\, we induce on it a semi-direct
product structure such that its coadjoint orbit can be seen as a deformati
on by diffeomorphism of the classical semisimple adjoint orbit (in fact\,
a symplectomorphism with respect to the Hermitian symplectic form). As an
application of this deformation\, we can find out some Lagrangian submani
folds (with respect to the Hermitian form) of the adjoint orbit.\n\nThis t
alk will be delivered in Spanish with slides in English.\n
LOCATION:https://stable.researchseminars.org/talk/SGFM/9/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Francisco Rubilar (Universidad Católica del Norte)
DTSTART:20200924T190000Z
DTEND:20200924T200000Z
DTSTAMP:20260404T110959Z
UID:SGFM/10
DESCRIPTION:Title: The Kuranishi map for moduli of vector bundles on surfaces of general
type.\nby Francisco Rubilar (Universidad Católica del Norte) as part
of Seminario de Geometría y Física - Matemática UCN-USP\n\n\nAbstract\
nWe use the Kuranishi map to study moduli of rank two vector bundles on su
rfaces of general type\, focusing on the case of product of smooth project
ive curves. More concretely\, we compare the set of stable bundles to the
irreducible component of the stack containing them and prove that they hav
e the same homology at a range bounded by $c_2$.\n\nThis is joint work wit
h E. Ballico\, E. Gasparim\, and B. Suzuki.\n
LOCATION:https://stable.researchseminars.org/talk/SGFM/10/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Henrique N. Sá Earp (Universidade Estadual de Campinas)
DTSTART:20201008T190000Z
DTEND:20201008T200000Z
DTSTAMP:20260404T110959Z
UID:SGFM/11
DESCRIPTION:Title: Instantons on Sasakian 7-manifolds\nby Henrique N. Sá Earp (Univ
ersidade Estadual de Campinas) as part of Seminario de Geometría y Físic
a - Matemática UCN-USP\n\n\nAbstract\nWe study a natural contact instanto
n (CI) equation on gauge fields over $7$-dimensional Sasakian manifolds\,
which is closely related both to the transverse Hermitian Yang-Mills (tHYM
) condition and the $G_2$-instanton equation. We obtain\, by Fredholm theo
ry\, a finite-dimensional local model for the moduli space of irreducible
solutions. We derive cohomological conditions for smoothness\, and we expr
ess its dimension in terms of the index of a transverse elliptic operator.
Finally we show that the moduli space of self dual contact instantons (AS
DI) is Kähler\, in the Sasakian case. As an instance of concrete interest
\, we specialise to transversely holomorphic Sasakian bundles over contact
Calabi-Yau $7$-manifolds\, and we show that\, in this context\, the notio
ns of contact instanton\, integrable $G_2$-instanton and HYM connection co
incide.\n
LOCATION:https://stable.researchseminars.org/talk/SGFM/11/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Sebastián Reyes-Carocca (Universidad de La Frontera)
DTSTART:20201022T190000Z
DTEND:20201022T200000Z
DTSTAMP:20260404T110959Z
UID:SGFM/12
DESCRIPTION:Title: On regular non-cyclic covers of the projective line\nby Sebastiá
n Reyes-Carocca (Universidad de La Frontera) as part of Seminario de Geome
tría y Física - Matemática UCN-USP\n\n\nAbstract\nA regular cover of th
e projective line is a compact Riemann surface $S$ (or smooth projective a
lgebraic curve) with action of a group $G$ in such a way that the correspo
nding quotient $S/G$ has genus zero. In this talk we shall consider those
cases in which $G$ is non-cyclic and of order $pq$ where $p$ and $q$ are p
rime numbers. We shall discuss some recent results concerning the surfaces
$S$ as before that form complex one-dimensional families in the moduli sp
ace of Riemann surfaces\, and some related aspects concerning their Jacobi
an varieties.\n
LOCATION:https://stable.researchseminars.org/talk/SGFM/12/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Stephen Griffeth (Universidad de Talca)
DTSTART:20201126T190000Z
DTEND:20201126T200000Z
DTSTAMP:20260404T110959Z
UID:SGFM/13
DESCRIPTION:Title: Representations of Weyl groups via the geometry of the Springer resol
ution\nby Stephen Griffeth (Universidad de Talca) as part of Seminario
de Geometría y Física - Matemática UCN-USP\n\n\nAbstract\nIn this expo
sitory talk\, I will explain how to relate representations of Weyl groups
to perverse sheaves. Harish-Chandra's philosophy of cusp forms appears in
a way that might be surprising.\n
LOCATION:https://stable.researchseminars.org/talk/SGFM/13/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Marija Dimitrijevic (University of Belgrade)
DTSTART:20201105T190000Z
DTEND:20201105T200000Z
DTSTAMP:20260404T110959Z
UID:SGFM/14
DESCRIPTION:Title: L-infinity Algebras of Gravity and their Braided Deformations\nby
Marija Dimitrijevic (University of Belgrade) as part of Seminario de Geom
etría y Física - Matemática UCN-USP\n\n\nAbstract\nIn this talk we will
describe the cyclic $L_\\infty$-algebra formulation\nof classical general
relativity without matter fields in the\nEinstein-Cartan (EC) formalism.
We will start with a brief review of\n$L_\\infty$-algebra and then apply t
his formalism to the EC gravity.\nAfter discussing the $L_\\infty$ structu
re of classical (undeformed)\ngravity\, we will present the $L_\\infty$ fo
rmulation of noncommutative\n(deformed\, braided) gravity. The noncommutat
ivity is introduced via the\nDrinfeld twist and the corresponding symmetri
es (diffeomorphisms and\nlocal Lorentz symmetry) are given in terms of twi
sted (braided)\nHopf-algebras. For simplicity\, we will discuss only the t
hree and four-dimensional cases. Nevertheless\, the whole construction can
be done in\nan arbitrary dimensional case.\n
LOCATION:https://stable.researchseminars.org/talk/SGFM/14/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Yang-Hui He (City\, University of London & Merton\, University of
Oxford)
DTSTART:20201112T190000Z
DTEND:20201112T200000Z
DTSTAMP:20260404T110959Z
UID:SGFM/15
DESCRIPTION:Title: Universes as Bigdata: Superstrings\, Calabi-Yau Manifolds and Machine
-Learning\nby Yang-Hui He (City\, University of London & Merton\, Univ
ersity of Oxford) as part of Seminario de Geometría y Física - Matemáti
ca UCN-USP\n\n\nAbstract\nWe review how historically the problem of string
phenomenology lead theoretical physics first to algebraic/differential ge
ometry\, and then to computational geometry\, and now to data science and
AI.\n\nWith the concrete playground of the Calabi-Yau landscape\, accumula
ted by the collaboration of physicists\, mathematicians\, and computer sci
entists over the last 4 decades\, we show how the latest techniques in mac
hine-learning can help explore problems of physical and mathematical inter
est\, from geometry to group theory\, to combinatorics and number theory.\
n
LOCATION:https://stable.researchseminars.org/talk/SGFM/15/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Edward Hirst (City\, University of London)
DTSTART:20201203T190000Z
DTEND:20201203T200000Z
DTSTAMP:20260404T110959Z
UID:SGFM/16
DESCRIPTION:Title: Machine-Learning Dessins d'Enfants: Explorations via Modular and Seib
erg-Witten Curves\nby Edward Hirst (City\, University of London) as pa
rt of Seminario de Geometría y Física - Matemática UCN-USP\n\n\nAbstrac
t\nWe introduce in the context of Calabi-Yau manifolds\, and then apply ma
chine-learning to\, the study of dessins d'enfants. Specifically\, we inve
stigate a class of dessins which reside at the intersection of the investi
gations of modular subgroups and extremal elliptic K3 surfaces. A deep fee
d-forward neural network performs classification of Galois extension degre
e over the rationals\, known to be a difficult problem. The classification
s reached accuracy 0.92 relatively quickly.\nIn relation to papers: 2004.0
5218 & 2001.01212\n
LOCATION:https://stable.researchseminars.org/talk/SGFM/16/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Giuseppe De Nittis (Pontificia Universidad Católica de Chile)
DTSTART:20201217T190000Z
DTEND:20201217T200000Z
DTSTAMP:20260404T110959Z
UID:SGFM/17
DESCRIPTION:Title: Quantization of edge currents along magnetic interfaces: A K-theory a
pproach\nby Giuseppe De Nittis (Pontificia Universidad Católica de Ch
ile) as part of Seminario de Geometría y Física - Matemática UCN-USP\n\
n\nAbstract\nThe purpose of this talk is to explain how to describe the pr
opagation of topological currents along magnetic interfaces (also known as
magnetic walls) of a two-dimensional material using K-theory. We initiall
y consider tight-binding magnetic models associated with generic magnetic
multi-interfaces and we will describe the K-theoretical setting in which a
bulk-interface duality can be derived. Then\, we will focus on the (nont
rivial) case of the Iwatsuka magnetic field. The exposition is intended to
be pedagogical and aimed at a non-specialist audience.\n\nWork in collabo
ration with: Esteban Gutiérrez\n
LOCATION:https://stable.researchseminars.org/talk/SGFM/17/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Emilia Mezzetti (Università degli Studi di Trieste)
DTSTART:20210408T200000Z
DTEND:20210408T210000Z
DTSTAMP:20260404T110959Z
UID:SGFM/18
DESCRIPTION:Title: Lefschetz properties\, Laplace equations and Galois coverings\nby
Emilia Mezzetti (Università degli Studi di Trieste) as part of Seminario
de Geometría y Física - Matemática UCN-USP\n\n\nAbstract\nIn an articl
e in collaboration with Rosa M. Mirò-Roig and Giorgio Ottaviani (Canad. J
. Math. 65\, 2013)\, we established a relation\, due to apolarity\, betwee
n Artinian homogeneous ideals of a polynomial ring not satisfying the Weak
Lefschetz Property - WLP - and projective varieties that verify a Laplace
equation of a certain order s\, i.e. such that all the s-osculating space
s have dimension less than expected. Thanks to this relation\, it is possi
ble to extend to various classes of toric varieties some classical results
due to Eugenio Togliatti. In the seminar\, I will introduce these notions
and I will speak of some recent results in collaboration with Liena Colar
te and Rosa M. Miro'-Roig\, relating them to cyclic Galois coverings.\n
LOCATION:https://stable.researchseminars.org/talk/SGFM/18/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Brent Pym (McGill University)
DTSTART:20210422T200000Z
DTEND:20210422T210000Z
DTSTAMP:20260404T110959Z
UID:SGFM/19
DESCRIPTION:Title: A global Weinstein splitting theorem for holomorphic Poisson manifold
s.\nby Brent Pym (McGill University) as part of Seminario de Geometrí
a y Física - Matemática UCN-USP\n\n\nAbstract\nA foundational result in
Poisson geometry\, due to Weinstein\,\nstates that any Poisson bracket on
a manifold can be written locally as\nthe Poisson bracket of symplectic fo
rm in canonical coordinates\, and a\nPoisson bracket that vanishes at a po
int. A key consequence is that\nevery Poisson manifold has a canonical f
oliation with symplectic leaves.\nI will give an introduction to these ide
as\, and then discuss the problem\nof globalizing Weinstein's decompositio
n\, to split the manifold itself\n(or a covering thereof) as a product of
a symplectic leaf and a\ntransverse Poisson manifold. While the existenc
e of such a splitting is\nrare in the context of smooth manifolds\, it tur
ns out to be automatic\nfor holomorphic Poisson structures on compact Käh
ler manifold admitting\na simply-connected compact symplectic leaf. This
talk is based on joint\nwork with Stéphane Druel\, Jorge Vitório Pereir
a\, and Frédéric Touzet\,\nwhich in turn relies in an essential way on a
notion of "subcalibrations"\nin Poisson geometry introduced recently by P
edro Frejlich and Ioan Mărcuț.\n
LOCATION:https://stable.researchseminars.org/talk/SGFM/19/
END:VEVENT
BEGIN:VEVENT
SUMMARY:João Nuno Mestre (University of Coimbra)
DTSTART:20210506T200000Z
DTEND:20210506T210000Z
DTSTAMP:20260404T110959Z
UID:SGFM/20
DESCRIPTION:Title: Deformations of symplectic groupoids\nby João Nuno Mestre (Unive
rsity of Coimbra) as part of Seminario de Geometría y Física - Matemáti
ca UCN-USP\n\n\nAbstract\nSymplectic groupoids are geometric objects that
function as global counterparts to Poisson manifolds\, in the same way\, t
hat Lie groups are global counterparts to Lie algebras. In this talk\, I w
ill first give an idea of what these objects are and of how that analogy w
orks\, and I will then present the construction of the deformation cohomol
ogy controlling deformations of symplectic groupoids.\nI will then compute
this cohomology in some examples\, explain how to use it in a Moser path
argument\, and relate it to the deformation theory of the corresponding Po
isson manifolds. The talk is based on joint work with Cristian Cárdenas (
UFF) and Ivan Struchiner (USP).\n
LOCATION:https://stable.researchseminars.org/talk/SGFM/20/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Jorge Gamboa (Universidad de Santiago de Chile)
DTSTART:20210520T200000Z
DTEND:20210520T210000Z
DTSTAMP:20260404T110959Z
UID:SGFM/21
DESCRIPTION:Title: Corrections of the magnetic moment of the muon and possibilities of n
ew physics\nby Jorge Gamboa (Universidad de Santiago de Chile) as part
of Seminario de Geometría y Física - Matemática UCN-USP\n\n\nAbstract\
nThe seminar will explain the meaning of the recent measurements by FermiL
ab and Brookhaven of the anomalous magnetic moment of the muon and the pos
sibilities that these results have to understand Physics beyond the standa
rd model.\n
LOCATION:https://stable.researchseminars.org/talk/SGFM/21/
END:VEVENT
BEGIN:VEVENT
SUMMARY:James Pascaleff (University of Illinois)
DTSTART:20210603T200000Z
DTEND:20210603T210000Z
DTSTAMP:20260404T110959Z
UID:SGFM/22
DESCRIPTION:Title: Structures in the Floer theory of Symplectic Groupoids\nby James
Pascaleff (University of Illinois) as part of Seminario de Geometría y F
ísica - Matemática UCN-USP\n\n\nAbstract\nA symplectic groupoid is a Lie
groupoid with a multiplicative symplectic form. We take the perspective t
hat such an object is a symplectic manifold with an extra categorical stru
cture. Applying the machinery of Floer theory\, the extra structure is exp
ected to yield a monoidal structure on the Fukaya category. I will take an
examples-based approach to work out what these structures are\, focusing
on cases such as the cotangent bundle of a compact manifold.\n
LOCATION:https://stable.researchseminars.org/talk/SGFM/22/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Silvina Ponce Dawson (Universidad de Buenos Aires)
DTSTART:20210617T200000Z
DTEND:20210617T210000Z
DTSTAMP:20260404T110959Z
UID:SGFM/23
DESCRIPTION:Title: Nested pooling for the efficient detection of infected samples\nb
y Silvina Ponce Dawson (Universidad de Buenos Aires) as part of Seminario
de Geometría y Física - Matemática UCN-USP\n\n\nAbstract\nThe rapid spr
ead of the SARS-CoV-2 pandemic confronted us with the need of designing la
rge-scale\, cost-effective testing programs. To this end\, running the tes
t on pooled samples can be a solution if the detection method (in the case
of SARS-CoV-2\, the method to detect the viral RNA) is sensitive enough.
Cost-effective strategies\, on the other hand\, require the definition of
efficient deconvolution and re-testing procedures for the identifcation of
the carrier. In this talk I will describe an efficient nested pooling str
ategy that we have devised in collaboration with Ines Armendariz\, Pablo F
errari\, Daniel Fraiman and Mario Martinez and discuss its practical imple
mentation using droplet digital PCR (ddPCR)\, which was shown to be 10-100
times more sensitive than the current gold standard for viral RNA detecti
on\, RT-qPCR. The latter part of the work was also done with Hugo Menzella
. Among other aspects\, I will discuss how the RNA quantification that ddP
CR provides at the end of the test and the nested nature of the strategy c
an be combined to perform self-consistency tests for a better identificati
on of infected individuals and of unviable samples. A user-friendly interf
ace is available at pooling.df.uba.ar for those who want to define their b
est pooling strategy under different constraints.\n
LOCATION:https://stable.researchseminars.org/talk/SGFM/23/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Mark Colarusso (University of South Alabama)
DTSTART:20210701T200000Z
DTEND:20210701T210000Z
DTSTAMP:20260404T110959Z
UID:SGFM/24
DESCRIPTION:Title: Geometry of complex Gelfand - Zeitlin integrable systems\nby Mark
Colarusso (University of South Alabama) as part of Seminario de Geometrí
a y Física - Matemática UCN-USP\n\n\nAbstract\nWe discuss the geometry o
f the Gelfand-Zeitlin integrable systems on the complex general linear and
orthogonal Lie algebras. We show how geometric invariant theory and the t
heory of spherical varieties can be used to understand the fibres of the m
oment maps of these systems and discuss possible applications to the study
of Gelfand - Zeitlin modules.\n
LOCATION:https://stable.researchseminars.org/talk/SGFM/24/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Soren Galatius (University of Copenhagen)
DTSTART:20210715T200000Z
DTEND:20210715T210000Z
DTSTAMP:20260404T110959Z
UID:SGFM/25
DESCRIPTION:Title: Equivariant cobordism categories\nby Soren Galatius (University o
f Copenhagen) as part of Seminario de Geometría y Física - Matemática U
CN-USP\n\n\nAbstract\nI will explain recent work with G. Szucs (arXiv:1805
.12342) studying a category $\\mathrm{Cob}_d^G$ whose objects are closed $
(d-1)$-manifolds equipped with an action of a finite group $G$\, and whose
morphisms are equivariant cobordisms. The main result determines the homo
topy type of the classifying space of this category in terms of equivarian
t stable homotopy theory. Time permitting\, I will outline why this may be
a step towards an equivariant Madsen-Weiss theorem.\n
LOCATION:https://stable.researchseminars.org/talk/SGFM/25/
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