16 citations
2 papers
cond-mat.str-el2008★ 16 cited
Heat capacity of Schottky type in low-dimensional spin system
Saeed Mahdavifar, Alireza Akbari
The heat capacity of low-dimensional spin systems is studied using theoretical and numerical techniques. Keeping only two energy states, the system is mapped onto the two -level-sy…
gr-qc2008★ 3 cited
Time and Dirac Observables in Friedmann Cosmologies
Hossein Farajollahi
A cosmological time variable is emerged from the Hamiltonian formulation of Friedmann model to measure the evolution of dynamical observables in the theory. A set of observables ha…