International Workshop
Sphere packings, coverings, and spherical codes
SPCSC2023
May 28 – 31, 2023,
Sofia, Bulgaria
organized by
Institute of Mathematics and Informatics at the Bulgarian Academy of Sciences (IMI-BAS)
Faculty of Mathematics and Informatics, Sofia University “St. Kliment Ohridski” (FMI-SU)
Confirmed invited talks
The workshop will bring together leading experts from the fields of Sphere packings, sphere coverings and spherical codes to present new results and developments, open problems and new directions.
Eight invited lectures will be given in the morning sessions. The afternoon sessions will be devoted to contributed talks.
Organizing Committee
- Maya Stoyanova (Faculty of Mathematics and Informatics, Sofia University “St. Kliment Ohridski”), Chair
- Krassimira Ivanova (Institute of Mathematics and Informatics, Bulgarian Academy of Sciences)
- Silvia Boumova (Faculty of Mathematics and Informatics, Sofia University “St. Kliment Ohridski”)
- Konstantin Delchev (Institute of Mathematics and Informatics, Bulgarian Academy of Sciences)
- Anna Branzova (Institute of Mathematics and Informatics, Bulgarian Academy of Sciences)
Programme Committee
- Peter Boyvalenkov (Institute of Mathematics and Informatics, Bulgarian Academy of Sciences), Chair
- Ludmil Katzarkov (Institute of Mathematics and Informatics, Bulgarian Academy of Sciences)
- Geno Nikolov (Faculty of Mathematics and Informatics, Sofia University “St. Kliment Ohridski”)
May 28, 2023
08:00 Registration
08:55 Welcome Address
09:00 – 10:00, Oleg Pikhurko, Lower bounds via the hard-core sphere model
10:00 Coffee Break
10:30 – 11:00, Matthew de Courcy-Ireland, Six-dimensional sphere packing and linear programming
11:00 – 11:30, Danila Cherkashin, On the chromatic number of 2-dimensional spheres
11:30 Break
13:00 – 14:00, Yufei Zhao, Equiangular lines and eigenvalue multiplicities
14:00 Coffee Break
14:30 – 15:00, Nikolaj Glazunov, Optimal packing of Minkowski balls and domains, and applications
15:00 – 15:30, Alexander Polyanskii, Polynomial plank problems
17:00 Welcome Reception
May 29, 2023
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09:00 – 10:00, Edward B. Saff, Universal lower bounds for discrete potentials of spherical codes and designs
10:00 Coffee Break
10:30 – 11:00, Grigory Kabatiansky, Convex polyhedra with Boolean cube vertices which are far apart from each other
11:00 Break
13:00 – 13:30, Alexander Barg, The size of optimal binary codes with 2, 3, and 4 distances
13:30 – 14:00, Ilya Vorobyev, Correcting one error in channels with feedback
14:00 Coffee Break
14:30 – 15:00, Ivan Landjev, W-admissible partitions and MacWilliams-type Identities for linear codes over finite Frobenius rings
May 30, 2023
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09:00 – 10:00, Szilard Revesz, Delsarte’s extremal problem and packing on locally compact abelian groups
10:00 Coffee Break
10:30 – 11:30, Peter Grabner, Upper and lower bounds for Riesz and Green energies on projective spaces
11:30 Break
13:00 – 13:30, Damir Ferizović, Uniform distribution via projected lattices: from point sets to point sequences
13:30 – 14:00, Jordi Marzo, Discrepancy and covering radius of random point configurations on the sphere
14:00 Coffee Break
14:30 – 15:00, Ryan Matzke, Second-order asymptotics of maximal Riesz polarization on the sphere
15:00 – 15:30, Pirahmad Olimjoni, Tveberg-type properties of diametrical balls induced by matching of points
19:00 Official Dinner
May 31, 2023
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09:00 – 10:00, Masoud Zargar, New upper bounds on spherical codes and sphere packing densities (on-line)
10:00 Coffee Break
10:30 – 11:30, Oleg Musin, The SDP and LP bounds for spherical codes using their distance distribution
11:30 Break
13:00 – 13:30, Hiroshi Nozaki, Uniqueness of the D4 root system as tight antipodal spherical {10, 4, 2}-design
13:30 – 14:00, Pedro R. López-Gómez, A family of well-distributed points on the sphere with antipodal symmetry
14:00 Coffee Break
Venue and General Information
The Event is Supported by:
