## 31 Citations

Tilt of primordial gravitational wave spectrum in a universe with sterile neutrinos

- Physics
- 2014

In this work, we constrain the spectral index nt of the primordial gravitational wave power spectrum in a universe with sterile neutrinos by using the Planck temperature data, the WMAP 9-year…

Gravitational waves from inflation

- Physics
- 2016

The production of a stochastic background of gravitational waves is a fundamental prediction of any cosmological inflationary model. The features of such a signal encode unique information about the…

On the viability of Planck scale cosmology with quartessence

- PhysicsThe European Physical Journal C
- 2018

Growing evidence as the observations of the CMB (cosmic microwave background), galaxy clustering and high-redshift supernovae address a stable dynamically universe dominated by the dark components.…

Measuring the speed of cosmological gravitational waves.

- Physics
- 2015

In general relativity gravitational waves propagate at the speed of light, however in alternative theories of gravity that might not be the case. We study the effects of a modified speed of gravity,…

Large angular scale CMB anisotropy from an excited initial mode

- Physics
- 2015

According to inflationary cosmology, the CMB anisotropy gives an opportunity to test predictions of new physics hypotheses. The initial state of quantum fluctuations is one of the important options…

Inflation and alternatives with blue tensor spectra

- Physics
- 2014

We study the tilt of the primordial gravitational waves spectrum. A hint of blue tilt is shown from analyzing the BICEP2 and POLARBEAR data. Motivated by this, we explore the possibilities of blue…

What can we learn from the tension between PLANCK and BICEP2 data?

- Physics
- 2014

Recently BICEP2 collaboration has announced the detection of the primordial gravitational waves at high confidence level. In light of the results of B-modes power spectrum from BICEP2 and using the…

Exploring bouncing cosmologies with cosmological surveys

- Physics
- 2014

From recent observational data two significant directions have been made in the field of theoretical cosmology recently. First, we are now able to make use of present observations, such as the Planck…

Effects of modified gravity on B-mode polarization

- Physics
- 2014

We explore the impact of modified gravity on B-modes, identifying two main separate effects: lensing and propagation of tensor modes. The location of the inflationary peak of the BB spectrum depends…

Noncommutative geometry and the primordial dipolar imaginary power spectrum

- Physics, Mathematics
- 2015

We argue that noncommutative space-times lead to an anisotropic dipolar imaginary primordial power spectrum. We define a new product rule, which allows us to consistently extract the power spectrum…

## References

SHOWING 1-10 OF 32 REFERENCES

Polarizing primordial gravitational waves by parity violation

- Physics
- 2013

We study primordial gravitational waves (PGWs) in the Horava-Lifshitz (HL) theory of quantum gravity, in which high-order spatial derivative operators, including the ones violating parity,…

Tensor modes from a primordial Hagedorn phase of string cosmology.

- PhysicsPhysical review letters
- 2007

It is shown that a Hagedorn phase of string gas cosmology can provide a causal mechanism for generating a nearly scale-invariant spectrum of scalar metric fluctuations, without the need for an intervening period of de Sitter expansion, and the spectrum of tensor metric fluctuations is also nearly scale invariant.

Cosmological parameters from CMB and other data: A Monte Carlo approach

- Physics
- 2002

We present a fast Markov chain Monte Carlo exploration of cosmological parameter space. We perform a joint analysis of results from recent cosmic microwave background ~CMB! experiments and provide…

Effects of nonlinear dispersion relations on non-Gaussianities

- Physics
- 2011

We investigate the effect of non-linear dispersion relations on the bispectrum. In particular, we study the case were the modified relations do not violate the WKB condition at early times, focusing…

U(1) noncommutative gauge fields and magnetogenesis

- Physics
- 2005

The connection between the Lorentz invariance violation in the Lagrangian context and the quantum theory of noncommutative fields is established for the U(1) gauge field. The modified Maxwell…