2009 Cascade Topology Seminar
- Start Date: 04/25/2009
- End Date: 04/26/2009
Jose Maria Cantarero (UBC)
Dan Dugger (U.Oregon)
Chad Giusti (U.Oregon)
Veronique Godin (U.Calgary)
Laurent Meersseman (U.Bourgogne/PIMS)
Ron Stern (UC Irvine)
Gang Tian (Princeton University)
Troy Winfree (U.Washington)
University of British Columbia
The Cascade Topology Seminar is a biennial gathering of topologists from the Pacific Northwest and Southwestern Canada.
Speaker: Daniel Dugger (U.Oregon)
Title: Motivic stable homotopy groups
Speaker: Chad Giusti (U.Oregon)
Title: Unstable Vassiliev theory
Speaker: Veronique Godin (U.Calgary)
Title: Relative invariant of string topology
Speaker: Jose Maria Cantarero (UBC)
Title: Twisted K-theory and Groupoids
Speaker: Laurent Meersseman (PIMS/U.Bourgogne)
Title : Complex Manifolds, Real Quadrics and Convex Polytopes
Abstract : This is a joint work with Frederic Bosio (Poitiers,
France).
We investigate the topology of a large class of non-Kaehler compact
complex manifolds called LV-M manifolds. These manifolds are
diffeomorphic to real quadrics in the complex space C^n of a special
form, so we forget about the complex structures and work with this
model. On the other hand, LV-M manifolds admit a smooth torus action
whose quotient is a simple convex polytope and can be seen as a smooth
realization of moment-angle manifolds.
In this talk, I will explain how complicated is the topology of LV-M
manifolds by making a reduction to combinatorics of convex polytopes.
In particular, I will give a combinatorial formula for the homology
with coefficients in Z of LV-M manifolds. This uses cohomological
results of Buchstaber and Panov. I will also resolve an associated
wall-crossing problem by studying a set of surgeries defined on simple
convex polytopes.
Finally, I will discuss some consequences for compact complex
manifolds. In particular, I will prove that there exist affine compact
complex manifolds (that is manifolds with an atlas whose changes of
charts are affine biholomorphisms of C^n) with arbitrary complicated
homology groups. This contrasts with the Kaehler case : affine Kaehler
compact complex manifolds are covered by a complex torus.
Speaker: Ronald J. Stern (UC Irvine)
Title: Finite group actions on smooth 4-manifolds
Abstract: We will outline the construction of infinite families
of smooth actions of finite cyclic groups on simply connected smooth
4-manifolds with nontrivial Seiberg-Witten invariants with the property
that the actions are equivariantly homeomorphic but not equivariantly
diffeomorphic. This is joint work with Ron Fintushel and Nathan
Sunukjian.
Speaker: Troy Winfree (U. Washington)
Title: Continuous homotopy fixed point spectra: finiteness properties and computations
Speaker: Gang Tian (Princeton University)
Title: Spaces with bounded Ricci curvature in dimension 4
Location: PIMS UBC--West Mall Annex Room 110
Saturday April 25
10:30 am Coffee & pastries
11:00 am Ron Stern (UC Irvine)
==lunch break==
1:30-1:55pm Troy Winfree (U.Washington)
2:05-2:30pm Chad Giusti (U.Oregon)
2:35-3:00pm Jose Maria Cantarero (UBC)
coffee break
3:30pm Dan Dugger (U.Oregon)
4:45pm Veronique Godin (U.Calgary)
7:00pm Conference Dinner/Party
SUNDAY April 26
9:30 am Coffee & pastries
10:00am Laurent Meersseman (U.Bourgogne/PIMS)
11:15am Gang Tian (Princeton University)
See http://www.mth.pdx.edu/events/cts/
for more information about the Cascade Topology Seminar
Participants should arrange their own accommodations.
Please contact Ken Leung (kleung@pims.math.ca) if you need assistance.
List of on-campus hotels
1. Carey Centre
contact: Hazel (hazel@careytheologicalcollege.ca)
http://www.careycentre.com/index.php?option=com_content&task=view&id=31
2. TRIUMF House
(604) 222-1062
Contact: Connie Santiago,TRIUMF House Reservation Office
Email: housing@triumf.ca
3. UBC Conference
(604) 822-1000
West Coast Suites and Walter Gage Towers
Pacific Spirit Hostel (Summer only)
E-Mail: reservations@housing.ubc.ca
4 Green College (Guest rooms / Student residence)
Contact: Ms. Simone Goguen
(604) 822-8660
Email: greencol@interchange.ubc.ca
http://www.greencollege.ubc.ca
5. St. John's College
(604) 822-6522
Email: allam@interchange.ubc.ca
contact: Alice Lam
Rate: $95/night
http://www.stjohns.ubc.ca/
6. Vancouver School of Theology (VST)
6000 Iona Drive, Vancouver, BC V6T 1L4
Phone: 604-822-6398
Rate: $96.9/night (15% tax)
http://www.vst.edu/housing/guestrooms.php