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- Felix Berkhahn, Dennis D. Dietrich, Stefan Hofmann, Florian Kühnel, Parvin Moyassari
- Physical review letters
- 2012

We construct deformations of general relativity that are consistent and phenomenologically viable, since they respect, in particular, cosmological backgrounds. These deformations have unique symmetries in accordance with their Minkowski cousins (Fierz-Pauli theory for massive gravitons) and incorporate a background curvature induced self-stabilizing… (More)

- Akbar Shirzad, M. Monemzadeh, Parvin Moyassari
- 2004

A generalization of BFT method is given in which it is not needed to do a reduction process to separate all second class constraints from first class ones. We have shown that it is better to add auxiliary fields whenever second class constraints emerge. The non-abelian Chern-Simons theory is discussed to demonstrate this approach.

- Parvin Moyassari
- 2008

The two dimensional analog of the Hadamard state condition is used to specify the local Hadamard states associated with a linear quantum field coupled to a two dimensional gravitational background. To characterize a local Hadamard state corresponding to a physical vacuum state, we apply a superselection rule in which the state dependent part of the… (More)

We demonstrate the capabilities of nonlinear Volterra models to simulate the behavior of an audio system and compare them to linear filters. In this paper a nonlinear model of an audio system based on Volterra series is presented and Normalized Least Mean Square algorithm is used to determine the Volterra series to third order. Training data for the models… (More)

- Parvin Moyassari, S . Jalalzadeh
- 2004

In the present work we show that planetary mean distances can be calculated through considering the Weyl geometry. We interpret the Weyl gauge field as a vector field associated with the hypercharge of the particles and apply the gauge concept of the Weyl geometry. The results obtained are shown to agree with the observed orbits of all the planets and of… (More)

- Parvin Moyassari
- 2009

In this paper we consider a Z2 symmetrical 3-brane embedded in a 5-dimensional spacetime. We study the effective Einstein equation and acceleration condition in presence of the quintom dark energy fluid as the bulk matter field. It is shown that the time-dependent bulk quintom field induces a time-dependent cosmological constant on the brane. In the… (More)

- Parvin Moyassari
- 2008

The induced Einstein equation on a perturbed brane in the Induced Matter Theory is reanalyzed. We indicate that in a conformally flat background, the local quantum corrections to the Einstein equation can be obtained via the IMT. Using the FRW metric as the 4D gravitational model, we show that the classical fluctuations of the brane may be related to the… (More)

In this paper we consider a Z2 symmetrical 3-brane embedded in a 5-dimensional spacetime. We study the effective Einstein equation and acceleration condition in presence of the quintom dark energy fluid as the bulk matter field. The effective Einstein equation on the brane in the framework of DGP model is obtained where the quintom field is considered as… (More)

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