151 citations
- Helsinki Institute of PhysicsFI5 papers
- University of HelsinkiFI5 papers
- Alexandru Ioan Cuza UniversityRO3 papers
- Jadavpur UniversityIN2 papers
- University of ThessalyGR2 papers
- Instituto Nacional de Matemática Pura e AplicadaBR1 paper
- National Taitung UniversityTW1 paper
- Payame Noor UniversityIR1 paper
- Quy Nhon UniversityVN1 paper
- University of CagliariIT1 paper
19 papers
On the (1+3) threading of spacetime with respect to an arbitrary timelike vector field
Aurel Bejancu, Constantin Călin
We develop a new approach on the (1+3) threading of spacetime with respect to a congruence of curves defined by an arbitrary timelike vector field. The study is based on s…
Metric regularity of composition set-valued mappings: metric setting and coderivative conditions
Marius Durea, Van Ngai Huynh, Huu Tron Nguyen +1
The paper concerns a new method to obtain a direct proof of the openness at linear rate/metric regularity of composite set-valued maps on metric spaces by the unification and refin…
A note on surfaces with parallel mean curvature
Dorel Fetcu, Harold Rosenberg
We use a Simons type equation in order to characterize complete non-minimal pmc surfaces with non-negative Gaussian curvature.
On the energy of charged black holes in generalized dilaton-axion gravity
I. Radinschi, Farook Rahaman, Asish Ghosh
In this paper we calculate the energy distribution of some charged black holes in generalized dilaton-axion gravity. The solutions correspond to charged black holes arising in a Ka…
Gauge field theories with covariant star-product
M. Chaichian, A. Tureanu, G. Zet
A noncommutative gauge theory is developed using a covariant star-product between differential forms defined on a symplectic manifold, considered as the space-time. It is proven th…
A note on biharmonic curves in Sasakian space forms
Dorel Fetcu
We classify the biharmonic non-Legendre curves in a Sasakian space form for which the angle between the tangent vector field and the characteristic vector field is constant and obt…