scholarly journals Scale dependence of halo bispectrum from non-Gaussian initial conditions in cosmological N-body simulations

2010 ◽  
Vol 2010 (07) ◽  
pp. 002-002 ◽  
Author(s):  
Takahiro Nishimichi ◽  
Atsushi Taruya ◽  
Kazuya Koyama ◽  
Cristiano Sabiu
Keyword(s):  
Initial Conditions ◽  
Scale Dependence ◽  
Non Gaussian

Adaptive distributed partitioning filters: non-gaussian initial conditions

1999 ◽  
Vol 17 (3) ◽  
pp. 405-419
Author(s):  
Demetrios G. Lainiotis ◽  
Pavlos K. Giannakopoulos ◽  
Sokrates K. Katsikas
Keyword(s):  
Initial Conditions ◽  
Non Gaussian

SEARCHING FOR QUANTUM GRAVITY EFFECTS IN COSMOLOGICAL DATA

1994 ◽  
Vol 03 (01) ◽  
pp. 257-263 ◽  
Author(s):  
D.S. SALOPEK
Keyword(s):  
Quantum Gravity ◽  
Initial Conditions ◽  
Microwave Background ◽  
Nonlinear Quantum ◽  
Gravity Effects ◽  
Cosmological Data ◽  
Clustering Data ◽  
Non Gaussian ◽  
Excess Power ◽  
The Universe

If the inflationary scenario describes our Universe, then it is possible that quantum gravity phenomena could be observed in anisotropy experiments of the microwave background as well as in galaxy clustering data. Primordial gravitational radiation arising from inflation is a consequence of quantum gravity. Moreover, the wavefunction of the Universe is currently being measured by the COBE satellite. A non-Gaussian distribution could be a signature of nonlinear quantum gravity. In fact, the excess power power seen in the APM survey of galaxies can arise from non-Gaussian initial conditions generated during inflation.

scholarly journals Review of Local Non-Gaussianity from Multifield Inflation

2010 ◽  
Vol 2010 ◽  
pp. 1-18 ◽  
Author(s):  
Christian T. Byrnes ◽  
Ki-Young Choi
Keyword(s):  
Field Model ◽  
Scale Dependence ◽  
Separable Potential ◽  
Local Form ◽  
Slow Roll ◽  
Hybrid Inflation ◽  
Non Gaussian ◽  
General Conditions ◽  
Slow Roll Inflation

We review models which generate a large non-Gaussianity of the local form. We first briefly consider three models which generate the non-Gaussianity either at or after the end of inflation; the curvaton scenario, modulated (p)reheating, and an inhomogeneous end of inflation. We then focus on ways of generating the non-Gaussianity during inflation. We derive general conditions which a product or sum separable potential must satisfy in order to generate a large local bispectrum during slow-roll inflation. As an application, we consider two-field hybrid inflation. We then derive a formalism not based on slow roll which can be applied to models in which the slow-roll parameters become large before inflation ends. An exactly soluble two-field model is given in which this happens. Finally, we also consider further non-Gaussian observables, a scale dependence offNLand the trispectrum.

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