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pro vyhledávání: '"Prasad, Jayanti"'
In the absence of any available vaccines or drugs, prevention of the spread of Coronavirus Disease 2019 (COVID-19) pandemic is being achieved by putting many mitigation measures in place. It is indispensable to have robust and reliable ways of evalua
Externí odkaz:
http://arxiv.org/abs/2004.07750
Publikováno v:
JCAP02(2018)043
We revisit the constraints that Planck 2015 temperature, polarization and lensing data impose on the parameters of warm inflation. To this end, we study warm inflation driven by a single scalar field with a quartic self interaction potential in the w
Externí odkaz:
http://arxiv.org/abs/1710.11109
The success of a given inflationary model crucially depends upon two features: its predictions for observables such as those of the Cosmic Microwave background (CMB) and its insensitivity to the unknown ultraviolet (UV) physics such as quantum gravit
Externí odkaz:
http://arxiv.org/abs/1705.11071
Publikováno v:
Phys. Rev. D 93, 023516 (2016)
If the inflationary era is preceded by a radiation dominated era in which the inflaton too was in thermal equilibrium at some very early time then the CMB data places an upper bound on the comoving temperature of the (decoupled) inflaton quanta. In a
Externí odkaz:
http://arxiv.org/abs/1506.04808
Publikováno v:
JCAP 06(2015) 014
The remarkable progress in cosmic microwave background (CMB) studies over past decade has led to the era of precision cosmology in striking agreement with the $\Lambda$CDM model. However, the lack of power in the CMB temperature anisotropies at large
Externí odkaz:
http://arxiv.org/abs/1501.02647
Publikováno v:
JCAP06(2015)001
We revisit the scenario where inflation is preceded by a radiation era by considering that the inflaton too could have been in thermal equilibrium early in the radiation era. Hence we take into account not only the effect of a pre-inflationary era on
Externí odkaz:
http://arxiv.org/abs/1412.7093
Autor:
Prasad, Jayanti
Constraining theoretical models with measuring the parameters of those from cosmic microwave background (CMB) anisotropy data is one of the most active areas in cosmology. WMAP, Planck and other recent experiments have shown that the six parameters s
Externí odkaz:
http://arxiv.org/abs/1412.3298
Autor:
Goswami, Gaurav, Prasad, Jayanti
Publikováno v:
Phys. Rev. D 88, 023522 (2013)
It is well known that CMB temperature anisotropies and polarization can be used to probe the metric perturbations in the early universe. Presently, there exist neither any observational detection of tensor modes of primordial metric perturbations nor
Externí odkaz:
http://arxiv.org/abs/1303.4747
Publikováno v:
2012MNRAS.426.3295-3314
Foreground removal is a major challenge for detecting the redshifted 21-cm neutral hydrogen (HI) signal from the Epoch of Reionization (EoR). We have used 150 MHz GMRT observations to characterize the statistical properties of the foregrounds in four
Externí odkaz:
http://arxiv.org/abs/1208.1617
Autor:
Prasad, Jayanti, Chengalur, Jayaram
Publikováno v:
Exp Astron (2012) 33:157-171
We describe a flagging and calibration pipeline intended for making quick look images from GMRT data. The package identifies and flags corrupted visibilities, computes calibration solutions and interpolates these onto the target source. These flagged
Externí odkaz:
http://arxiv.org/abs/1111.6415