14.2k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
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4 papers · 2 filters
Existence of periodic orbits in nonlinear oscillators of Emden-Fowler form
S. C. Mancas, H. C. Rosu
The nonlinear pseudo-oscillator recently tackled by Gadella and Lara is mapped to an Emden-Fowler (EF) equation that is written as an autonomous two-dimensional ODE system for whic…
Barotropic FRW cosmologies with Chiellini damping
Haret C. Rosu, Stefan C. Mancas, Pisin Chen
It is known that barotropic FRW equations written in the conformal time variable can be reduced to simple linear equations for an exponential function involving the conformal Hubbl…
One-parameter supersymmetric Hamiltonians in momentum space
Haret C. Rosu, Stefan C. Mancas, Pisin Chen
Recent results on the one-parameter supersymmetric deformation in momentum space by Curtright and Zachos (2014 J. Phys. A: Math. and Theor. 47 145201; arXiv:1311.6147v2) are presen…
Ermakov-Lewis Invariants and Reid Systems
Stefan C Mancas, Haret C Rosu
Reid's m'th-order generalized Ermakov systems of nonlinear coupling constant alpha are equivalent to an integrable Emden-Fowler equation. The standard Ermakov-Lewis invariant is di…