Zobrazeno 1 - 10
of 48
pro vyhledávání: '"Joy, Minu"'
Publikováno v:
Class. Quantum Grav. 41 (2024) 205001
A sharp step on a chaotic potential can enhance primordial curvature fluctuations on smaller scales to the $\mathcal{O}(10^{-2})$ to form primordial black holes (PBHs). The present study discusses an inflationary potential with a sharp step that resu
Externí odkaz:
http://arxiv.org/abs/2411.10076
Publikováno v:
International Journal of Modern Physics D 2023
We discuss a cosmological scenario with a stochastic background of gravitational waves sourced by the tensor perturbation due to a hybrid inflationary model with cubic potential. The tensor-to-scalar ratio for the present hybrid inflationary model is
Externí odkaz:
http://arxiv.org/abs/2302.05769
We introduce a novel evolutionary method that takes leverage from the MCMC method that can be used for constraining the parameters and theoretical models of Cosmology. Unlike the MCMC technique, which is essentially a non-parallel algorithm by design
Externí odkaz:
http://arxiv.org/abs/2205.01752
Publikováno v:
Pramana J. Phys. (2022) 96:56
Inflationary model driven by a scalar field whose potential has a step in the second derivative with respect to the field is considered. For the best fit potential parameter values, the 3-point function and the non-Gaussianity associated with the fea
Externí odkaz:
http://arxiv.org/abs/2106.02043
Publikováno v:
In Physics of the Dark Universe December 2023 42
Autor:
A, Aiswarya., Joy, Minu
Publikováno v:
JCAP02(2019)025
Using Wenzel-Kramers-Brillouin (WKB) approximation the scalar and tensor power spectra are obtained. Scale invariant spectra are obtained and the spectral indices come very close to the observed data from WMAP and Planck experiments. The advantage of
Externí odkaz:
http://arxiv.org/abs/1809.08572
Publikováno v:
JCAP 01 (2015) 043
Cosmic Microwave Background (CMB) is an important probe for understanding the inflationary era of the Universe. We consider the Perturbed Power Law (PPL) model of inflation which is a soft deviation from Power Law (PL) inflationary model. This model
Externí odkaz:
http://arxiv.org/abs/1410.8835
Autor:
Joy, Minu, Souradeep, Tarun
Publikováno v:
JCAP 1102:016,2011
We present a perturbative approach for studying inflation models with soft departures from scale free spectra of the power law model. In the perturbed power law (PPL) approach one obtains at the leading order both the scalar and tensor power spectra
Externí odkaz:
http://arxiv.org/abs/1011.4357
Publikováno v:
JCAP 0906:028,2009
A sudden small change in the second derivative of the inflaton potential can result in a universal local feature in the spectrum of primordial perturbations generated during inflation. The exact solution describing this feature \cite{minu} is charact
Externí odkaz:
http://arxiv.org/abs/0807.3334
Publikováno v:
Phys.Rev.D77:023514,2008
A model is developed in which the inflaton potential experiences a sudden small change in its second derivative (the effective mass of the inflaton). An exact treatment demonstrates that the resulting density perturbation has a quasi-flat power spect
Externí odkaz:
http://arxiv.org/abs/0711.1585