Cooperative Faculty Member
YOSHIYASU, Toru
 Position
 Professional staff
 Organization
 Institute for the Advancement of Higher Education
 Research Field
 Symplectic Geometry
 Keywords
 hprinciple, Lagrangian submanifold
 Research Activities
 I am interested in flexibilities in Symplectic Geometry. I study the topology of Lagrangian submanifolds by using the theory of hprinciples. These days, I also have an interest in flexibility phenomena of limits in Symplectic Geometry.
 Papers:

1. T. Yoshiyasu, On Lagrangian embeddings into the complex projective
spaces, Internat. J. Math. 27 (2016), no. 5, 1650044, 12 pp.
 2. N. Kasuya and T. Yoshiyasu, On Lagrangian embeddings of
parallelizable manifolds, Internat. J. Math. 24 (2013), no. 9, 1350073,
9 pp.
 Personal webpage
 https://sites.google.com/site/toruyoshiyasu/
YORDANOV, Borislav
 Position
 Assistant Professor
 Organization
 Office of International Affairs
 Research Field
 Hyperbolic Partial Differential Equations
 Keywords
 Nonlinear wave equation, Diffusion Phenomenon, Nonlinear Damping
 Research Activities
 My research interests lie in the field of dissipative linear and nonlinear hyperbolic PDEs. The study of such equations has been inspired by theoretical physics. Indeed, hyperbolic equations arise in some of the fundamental
theories including general relativity, quantum field theory, electrodynamics, acoustics and elasticity.
My recent work concerns two problems: (1) global wellposedness for nonlinear wave equations with critical and supercritical damping and (2) asymptotic behavior for dissipative wave equations related to the socalled diffusion approximation of damped waves.
 Papers:

1. P. Radu, G. Todorova and B. Yordanov, The Generalized Diffusion Phenomenon and Applications, accepted in SIAM Journal of Math. Anal., 2015.

2. G. Todorova and B. Yordanov, On the Regularizing Effect of Nonlinear Damping in Hyperbolic Equations, Trans. Amer. Math. Soc., 367 (2015), 50435058.

3. R. Ikehata, G. Todorova and B. Yordanov, Diffusion Phenomenon for Strongly Damped Wave Equations, J. Diff. Equations 254 (2013), 33523368.