Isolating the Decay Rate of Cosmological Gravitational Potential

Isolating the Decay Rate of Cosmological Gravitational Potential

The decay rate of cosmological gravitational potential measures the deviation from Einstein-de Sitter universe and can put strong constraints on the nature of dark energy and gravity. Usual method to measure this decay rate is through the integrated Sachs-Wolfe (ISW) effect-large scale structure (LSS) cross correlation. However, the interpretation of the measured correlation signal is complicat...

Evolution of the Potential in Cosmological Gravitational Clustering

In recent years there has been a developing realization that the interesting large–scale structure of voids, “pancakes”, and filaments in the Universe is a consequence of the efficacy of an approximation scheme for cosmological gravitation clustering proposal by Zel’dovich in 1970. However, this scheme was only supposed to apply to smoothed initial conditions. We show that this can be explained...

Cosmological Gravitational Wave Backgrounds

An overview is presented of possible cosmologically distant sources of gravitational wave backgrounds, especially those which might produce detectable backgrounds in the LISA band between 0.1 and 100 mHz. Examples considered here include inflation-amplified vacuum fluctuations in inflaton and graviton fields, bubble collisions in first-order phase transitions, Goldstone modes of classical self-...

Cosmological Applications of Gravitational Lensing

The role of postsynaptic potential decay rate in neural synchrony

Integrate-and-fire neurons have been used widely to model large-scale networks with temporal dynamics. Previous work has focused on temporal delays in modulating synchronization behavior; not much attention has been given to the postsynaptic potential (PSP) decay rate. In this paper, we show that varying the PSP decay rate has the same effect as adjusting the axonal conduction delay. The decay ...