mathematical string theory meeting
Previous southeastern regional mathematical string theory meetings:
Video of many of these talks can be found
in the string theory folder.
- 15th meeting: Saturday April 23, 2016. Group photos
- Friday April 22: Informal dinner, starting at 7 pm at
810 University City Boulevard in Blacksburg.
(Second right from Price's Fork intersection, located just behind the
- Saturday April 23 at VT, in Robeson 210:
- 9:30 - 10:30: Paul Oehlmann (Bonn, VT),
``Mordell-Weil Torsion in the Mirror of Multi-Sections,''
Photos from his talk
- 10:40 - 11:40: Ilarion Melnikov
``Relevant deformations and c-extremization,''
I will point out a simplification of the c-extremization technique of Benini and Bobev in the context of (0,2) supersymmetric RG flows from unitary compact UV fixed points.
- Photos from his talk
- 11:40-1:15: Lunch. Options include
Macado's (922 University City Blvd, B-burg) and
India Garden Restaurant
(210 Prices Fork Road, B-burg).
- 1:15-2:15: Taizan Watari (IPMU, Harvard),
``Heterotic--Type IIA dualtiy and degeneration of K3 surface,''
This is a survey on discrete choices in Heterotic--Type IIA
duality at 4D, and the role that degeneration of K3 surface plays.
- Photos from his talk
- 2:30-3:30: Louise Dolan
``General Solution of The Scattering Equations,''
The scattering equations, originally introduced by Fairlie and Roberts in
1972 and more recently shown by Cachazo, He and Yuan to provide a kinematic
basis for describing tree amplitudes for massless particles in arbitrary
space-time dimension, have been reformulated in polynomial form. The
scattering equations for $N$ particles are equivalent to $N-3$ polynomial
$h_m=0$, $1\leq m\leq N-3$, in $N-3$ variables, where $h_m$ has degree $m$
and is linear in the individual variables. Facilitated by this linearity,
elimination theory is used to construct a single variable polynomial
equations of degree $(N-3)!$ determining the solutions.
- Photos from her talk
- 14th meeting: Saturday October 24, 2015.
Group photo here.
- Friday October 23: Informal dinner, starting at 7:30 pm at
Sitar Indian Cuisine,
at 3630 Durham Chapel Hill Blvd in Durham NC.
- Saturday October 24 at Duke, in physics room 130:
- 9:30-10:30: Cyril Closset (Stony Brook),
``Localization on twisted spheres in two-dimensional gauge theories''
I will revisit the A-twisted gauged linear sigma model (GLSM) in
the case of (2,2) supersymmetry in two dimensions, together with its
Omega-background deformation. Exact results for correlation functions can be
obtained in terms of residues on the Coulomb branch, which has a number of
interesting applications. I will also consider the generalization to (0,2)
- 10:40-11:40: Abhijit Gadde (IAS), ``Aspects of 2d (0,2) theories''
- 11:40-1: Lunch
- 1-2: Chen Sun (VT), ``Rethinking gauge theory through Connes'
- 2:10-3:10: Daniel Park (Stony Brook, Rutgers),
``Towards finding all string vacua
in six dimensions''
I will review the efforts made towards approaching string
universality in six dimensions and report recent "cartographic" developments
on exploring the landscape of six-dimensional string vacua. A working
conjecture is that all the six-dimensional string vacua can be constructed
in F-theory, which leads to the problem of classifying all elliptically
fibered Calabi-Yau threefolds. I will present some progress on classifying
all the four-manifolds that can be used as a base of such threefolds.
- 3:20-4:20: Xin Gao (VT), ``Generalized Complete Intersection Calabi-Yau
(gCICY) Manifold and Its
We present a generalization of the complete intersection in products of
projective space (CICY)
construction of Calabi-Yau manifolds. Their utility stems from the fact that
they can be simply described
in terms of a `configuration matrix', a matrix of integers from which many
of the details of the
geometries can be easily extracted. The generalization we present is to
allow negative integers
in the configuration matrices which were previously taken to have positive
This broadening of the complete intersection construction leads to a larger
class of Calabi-Yau
manifolds than that considered in previous work. These new Calabi-Yau
manifolds are complete intersections in (not
necessarily Fano) ambient spaces with an effective anticanonical class. We
find examples with
topology distinct from any that has appeared in the literature to date. The
new manifolds thus
obtained have many interesting features. For example, we explore
contributions to the superpotential
and the structure of instantons wrapping effective divisors in Calabi-Yau
- 13th meeting: Saturday April 11, 2015. Schedule:
- Friday April 10: Informal dinner tentatively at
The Pit (321 W. Geer St.) in
Durham, starting at 7 pm.
The Pit is located at the intersection of Geer St and Rigsbee Avenue,
beside Fullsteam Brewery and
across the street from Motorco Music
Hall. There is a parking lot across the street also; however,
access to the lot is from Geer St. There is also parking available in
smaller lots elsewhere in the area, plus -- if you're willing to walk
a bit -- there is a large lot at the 400 block of Morris St.
- Saturday April 11:
- 9:30-10:30: Philip Argyres (University of Cincinnati),
``Geometric constraints on the space of N=2 SCFTs''
- 10:40-11:40: Sheldon Katz (University of Illinois),
``Topological string partition function on
elliptically fibered Calabi-Yau threefolds and Jacobi forms''
- 11:40-1: Lunch
- 1-2: Diana Vaman (University of Virginia),
``Entanglement Hamiltonians for chiral fermions''
- 2:10-3:10: Seung-Joo Lee (VT),
``BPS states, quiver invariants and mutations''
- 3:20-4:20: Jirui Guo (VT), ``Triality of two-dimensional (0,2)
- 12th meeting: Saturday October 25, 2014. Schedule:
- Friday October 24: informal dinner, meet at 6:30 pm at
Dales Indian Cuisine,
811 North Ninth St, Durham. Parking is available in the gravel lot across
the street from the restaurant.
- Saturday October 25 at Duke, in physics room 119:
- 10:15 - 11:15: Chris Beasley (Northeastern University),
``Self-Linking for Legendrian Knots''
- Abstract: I will discuss a new class of supersymmetric Wilson loop
operators in pure
N=2 Yang-Mills-Chern-Simons theory. These Wilson loops preserve one
supercharge on-shell and wrap arbitrary Legendrian knots in the standard
contact R^3. Conjecturally, perturbation theory produces a series of
finite-type Legendrian invariants for the knot. These invariants can be
analyzed by means of a new "perturbative" localization principle, which I
illustrate at leading-order.
This talk is based upon joint work with Brendan McLellan and Ruoran Zhang.
- 11:30-1: Lunch
- 1-2: Anindya Dey (UT Austin), ``Field Theory on Gibbons-Hawking Spaces''
- Abstract: The IR Lagrangian of an N=2 supersymmetric gauge theory
compactified on R^3 x S^1, around a generic point of its moduli space,
is a 3d sigma model with a hyperkahler target space. We consider a related
problem of constructing the IR Lagrangian of an N=2 theory on a special family
of circle fibrations over R^3 -- namely Gibbons-Hawking spaces. We propose
that the answer is a novel deformation of the standard 3d hyperkahler sigma
model and study the constraints imposed by supersymmetry on such a theory.
In particular, supersymmetry implies that the contribution of the NUT center
to the sigma model path integral must be a holomorphic section of a certain
holomorphic line bundle over the hyperkahler target space. We illustrate
various features of this deformed sigma model using certain examples involving
Abelian gauge theories on Gibbons-Hawking spaces.
- 2:15-3:15: Chris Beem (IAS), ``Chiral symmetry algebras and superconformal field theories in four and six dimensions''
- Abstract: I will describe the identification of a supersymmetry-protected subalgebra of the operator algebra of any four-dimensional N=2 SCFT or six-dimensional (2,0) SCFT that takes the form of a two-dimensional chiral algebra. The structure of this protected chiral algebra reflects the physics of the parent four- or six-dimensional theory in interesting ways. In many cases the relevant chiral algebra can be given an economical description as a W-algebra. Applications of this structure include the derivation of new unitarity bounds for four-dimensional SCFTs with global symmetries and the computation of three-point functions of half-BPS operators in the (2,0) theories at finite central charge.
- 3:30-4:30: Falk Hassler (Munich),
``String Geometry Beyond the Torus,''
- Abstract: Besides propagating in target space like a point particle, a
closed string is also able to wind around non-contractible circles. A
direct consequence thereof is T-duality. In the textbook example, it
identifies the closed string dynamics on a large and a small circle by
interchanging its winding and momentum modes. Patching a background by
such dualities clearly goes beyond the notion of conventional geometry.
However, there are extensive efforts to embed them into a framework
called string geometry. It provides access to a vast number of new
backgrounds with intriguing phenomenology, like e.g. the possibility to
obtain de Sitter vacua. Double Field Theory (DFT) is the most promising
approach to describe these backgrounds and their properties. But still,
it is closely related to the torus. I will present a theory based on
Closed String Field theory starting from a Wess-Zumino-Witten model
which goes beyond the torus. It plays an important role in clarifying
the recent confusion about different constraints in DFT. Furthermore it
allows to uplift a large class of new backgrounds to string theory.
These backgrounds are not T-dual to any geometric ones.
- 11th meeting: Fri-Sat April 4-5, joint UNC/Duke meeting following the
theme 'Mathieu moonshine'. Schedule:
- Thursday April 3: informal get-together around 6 pm in the evening at
Hickory Tavern, beside lobby of
(370 East Main, Carrboro, just a few blocks from the physics dep't).
People interested are welcome to join an informal dinner party.
- Friday April 4 at UNC: (see map)
- 9-10: snacks, outside Chapman 201
- 10-11 (Chapman 201): Daniel Persson (Sweden), ``Second quantization of Mathieu moonshine''
- 11-noon (Chapman 201):
Daniel Whalen (Stanford), ``Vector-valued
- noon-1:45: lunch
- 1:45-2:45 (Chapman 201): Timm Wrase (Stanford), ``Mathieu moonshine and
heterotic string compactifications''
- 2:45-4: break, possibly including tour of UNC campus's NC history
- 4-5: discussion in Chapman 125
- 6:30: dinner at
Crook's Corner in Chapel Hill.
- Saturday April 5 at Duke:
- 10:15-11:15 (physics 119):
Lara Anderson (VT),
``Geometric constraints in heterotic/F-theory duality''
- 11:30-1: lunch
- 1-2 (physics 119):
Xi Dong (Stanford),
``String theory avatars of Conway and Mathieu symmetries''
- 2:15-3:15 (physics 119): Christoph Keller (Rutgers), ``Partition functions and
- 3:30-4:30 (physics 119): Ben Gaines (Duke), ``(0,2) deformations
and the Hilbert scheme''
- 10th meeting: Friday October 11, 2013, in Gross Hall 330.
- 10:15-11:15: Sergei Gukov (Caltech), ``Fivebranes and 4-manifolds''
- 1-2: Eirik Svanes (Oxford), ``Heterotic supergravity, SU(3) structures,
and the alpha' expansion''
- 2:15-3:15: Emanuel Scheidegger (Freiburg, Harvard),
``Topological strings and quasimodular
- 3:30-4:30: Mauricio Romo (IPMU), ``Exact results in two-dimensional (2,2)
supersymmetric gauge theories with boundary''
- 9th meeting: Saturday April 6, 2013, in Duke physics room 119.
- 10-11: Daniel Park (Stony Brook)
- 11:05-11:30: Bei Jia (VT)
- 1-2: Paul Aspinwall (Duke)
- 2:15-3:15: Nils Carqueville (Stony Brook)
- 3:30-4:30: Katrin Wendland (Freiburg)
- 8th meeting: Friday-Saturday September 28-29, 2012. Schedule:
Saturday (all talks in physics room 119):
- 10-11: Matt Ballard (Wisconsin) (Hudson Hall 218)
- noon-1: Nick Addington (Duke) (physics faculty lounge)
- 10:30-11:30: Callum Quigley (Chicago)
- 1-2: Marco Bertolini (Duke)
- 2:30-3:30: Djordje Minic (VT)
- 7th meeting: Saturday March 24, 2012, in the physics faculty lounge
- 10:30-11:30: Jacques Distler (Texas-Austin)
- 1-2: Ilarion Melnikov (Potsdam, AEI), ``Adventures in quantum
- 2:30-3:30: Katrin Becker (Texas A&M), ``D-brane and O-plane
actions from string amplitudes,'' update: replaced by Daniel Robbins
- 6th meeting: Saturday October 8, 2011, in the physics first floor
- 10:30-11:30: Josh Lapan (Perimeter), ``Beyond CICY's through
- 1:15-1:45: Bei Jia (VT), ``Rigidly supersymmetric gauge theories
on curved superspace''
- 2-3: Philip Szepieowski (UVA), ``Consistent truncations of IIB on
Sasaki-Einstein manifolds and N-2 supergravity in five dimensions''
- 3:15-4:15: Harry Thacker (UVA), ``The role of the RR U(1) guage
field in holographic QCD''
- 5th meeting: Saturday April 2, 2011, in physics room 119.
- 10:30-11:30: Paul Aspinwall (Duke), ``New results from the ancient
- 1-2: Eric Sharpe (VT), ``Quantization of FI parameters in supergravity''
- 2:30-3:30: Djordje Minic (VT), ``String theory and non-equilibrium
- 4th meeting: Saturday October 16, 2010, in physics 298 (faculty lounge).
- 10:30-11:30: Lara Anderson (U-Penn), ``Supersymmetry and moduli
stabilization in heterotic theories''
- 1-2: Ronen Plesser (Duke)
- 2:30-3:30: Chaolun Wu (UVA), ``Relativistic and non-relativistic
real-time finite-temperature AdS/CFT''
- 3rd meeting: Friday April 2, 2010, in physics 298 (faculty lounge).
- 10-11: Paul Aspinwall (Duke), ``Quivers and matrix factorizations''
- 11:15-12:15: Ronen Plesse (Duke)
- 2-3: Usama al-Binni (Tennessee), ``Hawking radiation and quasinormal
modes for a black hole on a tensional codimension-2 brane''
- 3:20-4:20: Thomas Creutzig (UNC-CH)
- 2nd meeting: Friday October 2, 2009. Schedule:
- 10:15-11:15: James Alsup (Tennessee), ``Gravitational duals to
time-dependent hydrodynamics'' (LSRC A156)
- 1-2: Diana Vaman (UVA), ``All 4-dimensional static, spherically symmetric,
2-charge abelian Kaluza-Klein black holes and their CFT duals''
- 3:15-4:15: Stefano Guerra (Duke), ``The Catanese conjecture for flag
varieties'' (physics 298)
- 1st meeting: Friday April 3, 2009, in LSRC A156. Schedule:
- 10:15-11:45: Paul Aspinwall (Duke), ``Geometry with zero-brane
- 1:15-2:45: Lev Rozansky (UNC-CH)
- 2:45-4:15: Djordje Minic (VT), ``The physics of the Riemann zeros''