ABSTRACT The Universe is currently undergoing accelerated expansion driven by dark energy. Dark energy’s essential nature remains mysterious: one means of revealing it measuring the Universe’s size at different redshifts. This may be done using baryon acoustic oscillation (BAO) feature, a standard ruler in galaxy two-point correlation function (2PCF). In order to measure distance scale, dilates...

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We study Taylor series expansions of stationary characteristics of general-state-space Markov chains. The elements of the Taylor series are explicitly calculated and a lower bound for the radius of convergence of the Taylor series is established. The analysis provided in this paper applies to the case where the stationary characteristic is given through an unbounded sample performance function ...