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- Events — Department of Mathematics and Computer Science

Now Prospective Students Info Events All department events and seminars See also the individual seminar pages Geometry Topology Seminar Orbifolds 04 Kimberly Druschel 314 Ritter Hall from Feb 16 2016 11 00 AM to Feb 16 2016 12 00 PM Math CS Club New options for math and stat majors and minors Russell Blyth and Darrin Speegle SLU Ritter Lobby from Feb 17 2016 04 00 PM to Feb 17 2016 05 00 PM Topology Seminar Exotic Spheres 05 Open to the public a learning seminar with talks from advanced graduate students 202 Ritter Hall from Feb 18 2016 11 00 AM to Feb 18 2016 12 00 PM Also in this section Past Events Events which have already happened Document Actions RSS feed Send this Print this February 2016 February Su Mo Tu We Th Fr Sa 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 Upcoming Events Geometry Topology Seminar Tue Feb 16 2016 Orbifolds 04 Kimberly Druschel Math CS Club Wed Feb 17 2016 New options for math and stat majors and minors Russell Blyth and Darrin

Original URL path: http://mathcs.slu.edu/virtual_hosting//events/aggregator/ (2016-02-12)

Open archived version from archive - Events — Department of Mathematics and Computer Science

this page Address info Send to Required The e mail address to send this link to From Required Your email address Comment A comment about this link February 2016 February Su Mo Tu We Th Fr Sa 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 Upcoming Events Geometry Topology

Original URL path: http://mathcs.slu.edu/virtual_hosting//events/aggregator/sendto_form (2016-02-12)

Open archived version from archive - Events — Department of Mathematics and Computer Science

Prospective Students Info Events All department events and seminars See also the individual seminar pages Geometry Topology Seminar Orbifolds 04 Kimberly Druschel 314 Ritter Hall from Feb 16 2016 11 00 AM to Feb 16 2016 12 00 PM Math CS Club New options for math and stat majors and minors Russell Blyth and Darrin Speegle SLU Ritter Lobby from Feb 17 2016 04 00 PM to Feb 17 2016 05 00 PM Topology Seminar Exotic Spheres 05 Open to the public a learning seminar with talks from advanced graduate students 202 Ritter Hall from Feb 18 2016 11 00 AM to Feb 18 2016 12 00 PM Also in this section Past Events Events which have already happened Document Actions RSS feed Send this Print this January 2016 January Su Mo Tu We Th Fr Sa 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 Upcoming Events Geometry Topology Seminar Tue Feb 16 2016 Orbifolds 04 Kimberly Druschel Math CS Club Wed Feb 17 2016 New options for math and stat majors and minors Russell Blyth and

Original URL path: http://mathcs.slu.edu/virtual_hosting//events/aggregator/?month:int=1&year:int=2016&orig_query= (2016-02-12)

Open archived version from archive - Null Distance on a Spacetime — Department of Mathematics and Computer Science

Geometry Topology Seminar Topology Seminar When Tue Sep 22 2015 from 02 10 PM to 03 00 PM Where 225 Ritter Hall Contact Name Dr Khan Add event to calendar vCal iCal Given any time function on a spacetime M we define an induced null distance function built from and closely related to the causal structure of M This null distance is a conformal pseudometric in general but is positive definite under natural conditions Further in basic model cases the causal structure is encoded completely in the resulting metric space In the cosmological setting a canonical choice of time function was introduced and studied by Andersson Galloway and Howard We show that under their basic niceness condition the induced null distance is definite and hence provides a uniform way of encoding big bang and related spacetimes as metric spaces This is joint work with Christina Sormani Document Actions iCalendar vCalendar Send this Print this Subscribe to Talklist Sign up here for a weekly email of upcoming department events Email address Your name February 2016 February Su Mo Tu We Th Fr Sa 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18

Original URL path: http://mathcs.slu.edu/seminars/null-distance-on-a-spacetime/?searchterm=None (2016-02-12)

Open archived version from archive - Orbifold Morse Functions and Associated Handle Decompositions — Department of Mathematics and Computer Science

Nov 17 2015 from 11 00 AM to 12 00 PM Where 323 Ritter Hall Contact Name Dr Khan Add event to calendar vCal iCal Morse theory has been an indispensable tool in the study of manifolds but its generalization to orbifolds has gone mostly undeveloped until the past decade I will discuss the basic definitions surrounding Morse theory for orbifolds particularly the index of an orbifold critical point and show some examples which convey the correspondence between orbifold Morse functions and orbifold handle decompositions A particular emphasis will be placed on oriented 3 dimensional orbifolds where we will see a list of 20 distinct handle types I will provide a Morse function for an orbifold three sphere whose singular locus is a set of Borromean rings and we will look at the corresponding handle decomposition This example has the property that the singular orbifold handle attachments will affect the orbifold structure without altering the topology of the underlying space Document Actions iCalendar vCalendar Send this Print this Subscribe to Talklist Sign up here for a weekly email of upcoming department events Email address Your name February 2016 February Su Mo Tu We Th Fr Sa 1 2 3 4

Original URL path: http://mathcs.slu.edu/seminars/topology-seminar/orbifold-morse-functions-and-associated-handle-decompositions/?searchterm=None (2016-02-12)

Open archived version from archive - Asphericity Results for Labeled Oriented Tree Complexes — Department of Mathematics and Computer Science

to 03 00 PM Where 225 Ritter Hall Contact Name Dr Khan Add event to calendar vCal iCal Labeled oriented tree LOT complexes are 2 dimensional complexes whose structure is encoded in directed trees with vertex labels on their edges These complexes it turns out strongly resemble spines for classical knot complements in the 3 sphere In fact every classical knot complement may be regarded as an LOT complex In light of this connection it is natural to ask whether or not LOT complexes are aspherical that is whether or not their higher homotopy groups vanish In this talk we will explore the connection with classical knot complements and consider partial results relating to asphericity Beyond their role in 3 dimensional matters LOT complexes are known to correspond to the complements of certain kinds of disks in the 4 ball We will use this higher dimensional connection to obtain additional asphericity results The techniques here are visual for just a moment then combinatorial Document Actions iCalendar vCalendar Send this Print this Subscribe to Talklist Sign up here for a weekly email of upcoming department events Email address Your name February 2016 February Su Mo Tu We Th Fr Sa 1

Original URL path: http://mathcs.slu.edu/seminars/asphericity-results-for-labeled-oriented-tree-complexes/?searchterm=None (2016-02-12)

Open archived version from archive - Complete Connection on the Causal Boundary of Spherically Symmetric Static Spacetimes — Department of Mathematics and Computer Science

Stacey Harris of Saint Louis U What Geometry Topology Seminar Topology Seminar When Tue Oct 27 2015 from 02 10 PM to 03 00 PM Where 225 Ritter Hall Contact Name Dr Khan Add event to calendar vCal iCal Theoretical cosmology likes to make use of a conformal boundary for various spacetime models this means mapping via diffeomorphism on the image a physical spacetime M into a non physical spacetime M such that the mapping is conformal preserved causality and the image of M has compact closure in M hence M gets endowed with a boundary inheriting geometry from M One of the desireable properties of such a boundary is that it be complete in an appropriate sense A recent observation is that this is always possible for a static spherically symmetric spacetime or at any rate for physically reasonable ones But a conformal boundary is inherently a very ad hoc construction Is there any way to do this naturally The answer is yes The causal boundary construction is entirely natural in a categorical sense and it is well understood for static spherically symmetric spacetimes The problem is that the causal boundary comes with a topology but not a geometry and it is geometry that is needed to answer the question about completeness This talk illustrates a method of imputing a linear connection on the causal boundary of a static spherically symmetric spacetime There is not a unique way to do so but all ways in this method agree on completeness Document Actions iCalendar vCalendar Send this Print this Subscribe to Talklist Sign up here for a weekly email of upcoming department events Email address Your name February 2016 February Su Mo Tu We Th Fr Sa 1 2 3 4 5 6 7 8 9 10 11 12 13

Original URL path: http://mathcs.slu.edu/seminars/complete-connection-on-the-causal-boundary-of-spherically-symmetric-static-spacetimes/?searchterm=None (2016-02-12)

Open archived version from archive - Generalizing the Kneser Conjecture — Department of Mathematics and Computer Science

The Kneser Conjecture says that if a closed connected 3 manifold M has π 1 M G 1 G 2 then there exist 3 manifolds M 1 and M 2 such that π 1 M i G i and M M 1 M 2 Hillman has generalized this to 4 manifolds at the expense of introducing stabilizing S 2 S 2 factors to M More precisely if a closed connected 4 manifold M has π 1 M G 1 G 2 then there exist 4 manifolds M 1 and M 2 such that π 1 M i G i and M n S 2 S 2 M 1 M 2 for some nonnegative integer n This talk will review these results and then consider a generalization of these theorems to 3 and 4 manifolds with fundamental groups which are amalgamated free products The 3 dimensional case for amalgamated products has been done by Feustel The talk will end with a discussion of progress made in the case that the amalgamation is over a cyclic group of prime order Document Actions iCalendar vCalendar Send this Print this Subscribe to Talklist Sign up here for a weekly email of upcoming department events

Original URL path: http://mathcs.slu.edu/seminars/generalizing-the-kneser-conjecture/?searchterm=None (2016-02-12)

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