Artykuły naukowe | Articles: Ostatnio dodane

Wyświetlanie pozycji 41-44 z 44

    • Perturbative quantum damping of cosmological expansion 

      Broda, Bogusław (North-Holland, 2014)
      Perturbative quantum gravity in the framework of the Schwinger–Keldysh formalism is applied to compute lowest-order corrections to expansion of the Universe described in terms of the spatially flat Friedman–Lemaître–Robe ...

    • Conformal Newton–Hooke symmetry of Pais–Uhlenbeck oscillator 

      Andrzejewski, Krzysztof; Galajinsky, A.; Gonera, Joanna (North-Holland, 2014)
      It is demonstrated that the Pais–Uhlenbeck oscillator in arbitrary dimension enjoys the l -conformal Newton–Hooke symmetry provided frequencies of oscillation form the arithmetic sequence ωk=(2k−1)ω1, where k=1,…,n, and ...

    • “Isochronic” dynamical systems and nullification of amplitudes 

      Domienik, Joanna; Kosinski, Piotr (North-Holland, 2003)
      We construct the set of theories which share the property that the tree-level threshold amplitudes nullify even if both initial and final states contain the same type of particles. The origin of this phenomenon lies in ...

    • On the triviality of higher-derivative theories 

      Andrzejewski, Krzysztof; Gonera, Joanna; Machalski, Piotr; Bolonek-Lasoń, Katarzyna (North-Holland, 2012)
      The higher-derivative theories with degenerate frequencies exhibit BRST symmetry [V.O. Rivelles, Phys. Lett. B 577 (2003) 147]. In the present Letter meaning of BRST-invariance condition is analyzed. The BRST symmetry is ...