Workshop
Pseudospectra of operators: spectral singularities, semiclassics, pencils and random matrices
Sep 15, 2014  Sep 19, 2014
ICMS, 15 South College Street
Organisers
Name  Institution 

Boulton, Lyonell  HeriotWatt University 
Marletta, Marco  Cardiff University 
Pseudospectra of operators have been studied since the mid1970s and during the 1990s interest in the subject grew pushed by the scientific work and personal enthusiasm of Nick Trefethen. Pseudospectra crop up in diverse areas but it is unusual to have a workshop devoted to this as a central topic but with the developments in the subject over the last decade it now feels appropriate to survey the current state of the subject, identify problems of interest and speculate on future directions.
The workshop will focus on the following topics:
pseudospectra, matrix polynomials and operator pencils
spectral singularities, evolution equations and pseudospectra
semiclassical and asymptotic methods for pseudospectra of differential operators
(structured) pseudospectra of random matrices
The workshop will feature an "open science day" on the computation of pseudospectra: reallife challenges offering scientists and engineers an opportunity to discuss issues they encounter. The workshop will also have a public lecture at 4pm on Wednesday 17th September .
Arrangements
It is anticipated that the workshop will commence with Registration on Monday morning 15 September and close around midday on Friday 19 September 2014. Please take these timings into account when organising your travel to the workshop.
Participation
Participation is by invitation only. Invitations were sent at the end of March. If you were expecting an invitation and have not received one please contact diane.horberry(at)icms.org.uk .
Venue
The workshop will be held at 15 South College Street, Edinburgh. You may also find this map useful for the workshop. All lectures will be held in the Newhaven Lecture Theatre.
The Lecture Theatre is equipped with a data projector, computer, visualiser (the new generation of overhead projectors) and two blackboards. The projector and one board may be used simultaneously. It is best to bring your presentation on a memory stick to use in our ICMS computer. Alternatively, it is possible for you to use your own laptop with our data projector, but please be aware that you may have to alter your laptop resolutions/settings.
Travel
Information about travel to the UK and Edinburgh is available here.
Please note that it is your responsibility to have adequate travel insurance to cover medical and other emergencies that may occur on your trip.
A taxi directly from the airport will cost approximately 20.00 to 25.00 GBP to the city centre for a oneway journey. There is also a bus service direct from the airport to the city centre which will cost 4.00 GBP single or 7.00 GBP return  the Airlink 100. This is a frequent service (every 10 minutes during peak times) and will bring you close to Waverley Railway Station, only a short walk to the accommodation and the workshop venue (see map in 'Venue' section above).
Lothian buses charge £1.50 for a single, £3.50 for a day ticket. Please note that the exact fare is required and no change is given.
If travelling by train, please note that Edinburgh has three railway stations  Waverley Railway Station being the main station and closest to the workshop venue at 15 South College Street. If you alight at Edinburgh Waverley, the workshop venue is an easy 10 minute walk over North and South Bridge. (The other stations are Haymarket and Edinburgh Park at the West side of the city).
UK Visas
If you are travelling from overseas you may require an entry visa. A European visa does not guarantee entry to the UK. Please use this link to the UK Visas site to find out if you need a visa and if so how to apply for one.
Participants who require a visa for entry to the UK should contact ICMS as soon as possible.
Accommodation
Most participants will be staying at Pollock Halls of Residence:
Masson House, Pollock Halls of Residence, The University of Edinburgh, 18 Holyrood Park Road, Edinburgh EH16 5AY
0800 028 7118 (UK only)  +44 (0)131 651 2189
Pollock Halls is about a 2025 minute walk from ICMS.
Catering
The workshop grant will cover refreshments throughout the event, lunch on three days, an informal wine reception and a workshop dinner.
Wireless Access
The workshop venue, 15 South College Street, has wireless access throughout. On arrival at Registration you will be given instructions and a code for accessing the wireless network. For those without laptops, there will also be a couple of computers available for you to check your emails.
Registration Fee
A 70.00 GBP registration fee is payable by all. Unfortunately, we do not yet have an online payment system at ICMS. Details of how to pay will be emailed nearer the time of the workshop.
Who to contact?
If you have any enquiries about the arrangements for this workshop, please email: diane.horberry(at)icms.org.uk .
Programme
Monday 15 September 2014
09.0010.00  Registration & coffee in the Chapterhouse, Level 1 
10.0011.00  Nils Dencker (Lund University) 
11.0011.30  Coffee/Tea in the Chapterhouse 
11.3012.30  Olavi Nevanlinna (Aalto University) 
12.3014.00  Lunch provided in the Chapterhouse 
14.0014.30  Bernd Schroers (HeriotWatt University) 
14.3015.00  Michael Levitin (University of Reading) 
15.0015.30  Coffee/Tea in the Chapterhouse 
15.3016.00  Melina Freitag (University of Bath) 
16.0016.30  E.B. Davies (King's College London)

17.0018.30  Informal wine reception in the Chapterhouse 
Tuesday 16 September 2014
09.3010.30  Karl Meerbergen (KU Leuven) 
10.3011.00  Coffee/Tea in the Chapterhouse 
11.0012.00  Michael L. Overton (New York University) 
12.0014.00  Lunch provided in the Chapterhouse 
14.0014.30  Charles Batty (University of Oxford) 
14.3015.00  Anders Hansen (University of Cambridge) 
15.0015.30  Coffee/Tea in the Chapterhouse 
15.3016.00  Luka Grubisic (University of Zagreb) 
16.0016.30  Joe Viola (Universite de Nantes) 
Wednesday 17 September 2014
09.3010.30  Seamus Garvey (Nottingham University) 
10.3011.00  Coffee/Tea in the Chapterhouse 
11.0011.30  I. Goldshied (Queen Mary University of London) 
11.3012.00  Boris Khoruzhenko (Queen Mary University of London) 
12.00 onwards  Free afternoon 
15.30  Doors open for Open Science Session 
16.0017.00  Open Science session 
Thursday 18 September 2014
09.3010.30  Simon ChandlerWilde (University of Reading) 
10.3011.00  Coffee/Tea in the Chapterhouse 
11.0012.00  Marko Lindner (Hamburg University of Technology) 
12.0014.00  Lunch provided in the Chapterhouse 
14.0014.30  Eugene Shargorodsky (King's College London) 
14.3015.00  Sergey Naboko ( University of Kent and St Petersburg State University) 
15.0015.30  Coffee/Tea in the Chapterhouse 
15.3016.00  Thomas Ransford (Laval University) 
19.00  Workshop dinner at Magnum Restaurant, 1 Albany Street, Edinburgh 
Friday 19 September 2014
09.3010.30  Maciej Zworski (University of California at Berkeley) 
10.3011.00  Coffee/Tea in the Chapterhouse 
11.0012.00  Mark Embree (Virginia Tech) 
12.00  Close of workshop 
Presentations:
Presentation Details  

Batty, Charles  
From resolvent estimates to rates of decay  
View Abstract  
ChandlerWilde, Simon  
On Spectral Inclusion Sets and Computing the Spectra and Pseudospectra of Bounded Linear Operators  
View Abstract  
Davies, E.B.  
Complex eigenvalues of a selfadjoint linear pencil  
View Abstract  
Dencker, Nils  
Pseudospectra of nonselfadjoint semiclassical operators  
View Abstract  
Embree, Mark  
Nonnormality and the solution of matrix equations  
View Abstract  
Freitag, Melina  
A quadratically convergent algorithm for matrix distance problems  
View Abstract  
Goldsheid, Ilya  
Eigenfunctions of nonselfadjoint Jacobitype matrices  
View Abstract  
Grubisic, Luka  
Resolvent estimates and eigenvalue decay of solutions to Lyapunov operator equations.  
View Abstract  
Hansen, Anders  
Can everything be computed?  On the Solvability Complexity Index and Towers of Algorithms  
View Abstract  
Khoruzhenko, Boris  
How many eigenvalues of a truncated orthogonal matrix are real?  
View Abstract  
Levitin, Michael  
Real and nonreal spectra of indefinite linear pencils  
View Abstract  
Lindner, Marko  
Essential pseudospectra  
View Abstract  
Meerbergen, Karl  
Lyapunov and Sylvester inverse iteration for solving parametric eigenvalue problem  
View Abstract  
Naboko, Sergey  
On the detectable subspaces of the nonselfadjoint Friedrichs model.  
View Abstract  
Nevanlinna, Olavi  
Polynomial hulls, low rank perturbations and multicentric calculus  
View Abstract  
Overton, Michael L.  
Pseudospectra and spectral value sets: results and open problems  
View Abstract  
Ransford, Thomas  
Do the pseudospectra of a matrix determine its behavior?  
View Abstract  
Schroers, Bernd  
Resonances in quantised monopole dynamics  
View Abstract  
Shargorodsky, Eugene  
On the definition of pseudospectra  
View Abstract  
Viola, Joe  
Solution operators for evolution equations with quadratic generators.  
View Abstract  
Zworski, Maciej  
Stochastic stability for PollicottRuelle resonances  
View Abstract 
Participants
Name  Institution 

Anahtarci, Berkay  Sabanci University 
Batty, Charles  University of Oxford 
Bögli, Sabine  University of Bern 
Boulton, Lyonell  HeriotWatt University 
ChandlerWilde, Simon  University of Reading 
Davies, E.B.  King's College London 
Dencker, Nils  Lund University 
Embree, Mark  Virginia Tech 
Freitag, Melina  University of Bath 
Garvey, Seamus  Nottingham University 
Goldsheid, Ilya  Queen Mary University of London 
Grubisic, Luka  University of Zagreb 
Hansen, Anders  University of Cambridge 
Khoruzhenko, Boris  Queen Mary University of London 
Levitin, Michael  University of Reading 
Lindner, Marko  Hamburg University of Technology 
Marletta, Marco  Cardiff University 
Meerbergen, Karl  KU Leuven 
Melkonian, Houry  HeriotWatt University 
Naboko, Sergey  University of Kent and St Petersburg State University 
Nevanlinna, Olavi  Aalto University 
Overton, Michael L.  New York University 
Ransford, Thomas  Laval University 
Schroers, Bernd  HeriotWatt University 
Shargorodsky, Eugene  King's College London 
SmedleyWilliams, Kim  HeriotWatt University 
Spence, Alastair  University of Bath 
Viola, Joe  Universite de Nantes 
Zworski, Maciej  University of California at Berkeley 