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Browsing by Author "Pravabati, C"

Browsing by Author "Pravabati, C"

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  • Geometrical meaning of statistical isotropy of smooth random fields in two dimensions 
    Pravabati, C; Goyal, Priya; Yogendran, K. P; Appleby, Stephen (American Physical Society, 2021-12)
    We revisit the geometrical meaning of statistical isotropy that is manifest in excursion sets of smooth random fields in two dimensions. Using the contour Minkowski tensor, W1, as our basic tool we first examine geometrical ...
  • Ghost Interference and Quantum Erasure 
    Pravabati, C; Qureshi, T (Progress of Theoretical Physics, 2012-03)
    The two-photon ghost interference experiment, generalized to the case of massive particles, is theoretically analyzed. It is argued that the experiment is intimately connected to a double-slit interference experiment ...
  • Hot and cold spot counts as probes of non-gaussianity in the cosmic microwave background 
    Pravabati, C; Park, C; Yogendran, K. P; van de Weygaert, R (IOP Publishing, 2012-08-20)
    We introduce the numbers of hot and cold spots, n/subh/ and n/subc/, of excursion sets of the cosmic microwave background (CMB) temperature anisotropy maps as statistical observables that can discriminate different ...
  • Is the observable Universe consistent with the cosmological principle? 
    Aluri, Pavan Kumar; Cea, Paolo; Pravabati, C; Chu, Ming-Chung; Clowes, Roger G; Hutsemekers, Damien; Kochappan, Joby P; Lopez, Alexia M; Liu, Lang; Martens, Niels C. M; Martins, C. J. A. P; Migkas, Konstantinos; Colgain, Eoin O; Pranav, Pratyush; Shamir, Lior; Singal, Ashok K; Sheikh-Jabbari, M. M; Wagner, Jenny; Wang, Shao-Jiang; Wiltshire, David L; Yeung, Shek; Yin, Lu; Zhao, Wen (IOP Publishing, 2023-05-04)
    The cosmological principle (CP)—the notion that the Universe is spatially isotropic and homogeneous on large scales—underlies a century of progress in cosmology. It is conventionally formulated through the Friedmann-Lem ...
  • Local patch analysis for testing statistical isotropy of the Planck convergence map 
    Goyal, Priya; Pravabati, C (IOP Publishing, 2021-08)
    The small but measurable effect of weak gravitational lensing on the cosmic microwave background radiation provide information about the large-scale distribution of matter in the universe. We use the all sky distribution ...
  • Minkowski Tensors in Redshift Space—Beyond the Plane-parallel Approximation 
    Appleby, Stephen; Kochappan, Joby P; Pravabati, C; Park, Changbom (American Astronomical Society, 2023-01-10)
    The Minkowski tensors (MTs) can be used to probe anisotropic signals in a field, and are well suited for measuring the redshift-space distortion (RSD) signal in large-scale structure catalogs. We consider how the linear ...
  • Minkowski tensors in three dimensions: probing the anisotropy generated by redshift space distortion 
    Appleby, S; Pravabati, C; Park, C; Yogendran, K. P; Joby, P. K (IOP Publishing, 2018-08)
    We apply the Minkowski tensor statistics to three-dimensional Gaussian random fields. Minkowski tensors contain information regarding the orientation and shape of excursion sets that is not present in the scalar Minkowski ...
  • Minkowski Tensors in Two Dimensions: Probing the Morphology and Isotropy of the Matter and Galaxy Density Fields 
    Appleby, S; Pravabati, C; Park, C; Hong, S. E; Kim, J; Vidhya, G (IOP Publishing, 2018-05-10)
    We apply the Minkowski tensor statistics to two-dimensional slices of the three-dimensional matter density field. The Minkowski tensors are a set of functions that are sensitive to directionally dependent signals in the ...
  • Morphology of 21cm brightness temperature during the Epoch of Reionization using Contour Minkowski Tensor 
    Akanksha, K; Pravabati, C; Appleby, S (IOP Publishing, 2019-09)
    We use morphological descriptors, Betti numbers and Contour Minkowski Tensor (CMT) on 21cm brightness temperature excursion sets, to study the ionization and heating history of the intergalactic medium (IGM) during and ...
  • Morphology of CMB fields—effect of weak gravitational lensing 
    Goyal, Priya; Pravabati, C; Appleby, S (IOP Publishing, 2020-02)
    We study the morphology of the cosmic microwave background temperature and polarization fields using the shape and alignment parameters, β and α, that are constructed from the contour Minkowski tensor. The primary goal of ...
  • The nature of non-Gaussianity and statistical isotropy of the 408 MHz Haslam synchrotron map 
    Fazlu Rahman; Pravabati, C; Ghosh, Tuhin (IOP Publishing, 2021-07)
    Accurate component separation of full-sky maps in the radio and microwave frequencies, such as the cosmic microwave background (CMB), relies on a thorough understanding of the statistical properties of the Galactic foreground ...
  • New features in the curvaton model 
    Pravabati, C; Huang, Q. G (The American Physical Society, 2011-01)
    We demonstrate novel features in the behavior of the second- and third-order nonlinearity parameters of the curvature perturbation, namely f NL and g NL , arising from nonlinear motion of the curvaton field. ...
  • Non-gaussianity of diffuse galactic synchrotron emission at 408 MHz 
    Rana, S; Ghosh, T; Bagla, Jasjeet S; Pravabati, C (Oxford University Press on behalf of the Royal Astronomical Society, 2018-11)
    Diffuse Galactic emission at low frequencies is a major contaminant for studies of redshifted 21 cm line studies. Removal of these foregrounds is essential for exploiting the signal from neutral hydrogen at high redshifts. ...
  • A novel probe of ionized bubble shape and size statistics of the epoch of reionization using the contour Minkowski tensor 
    Akanksha, K; Pravabati, C; Appleby, S; Park, C (IOP Publishing, 2018-10)
    We employ the rank-2 contour Minkowski tensor in two dimensions to probe length and time scales of ionized bubbles during the epoch of reionization. We demonstrate that ionized bubbles are not circular, and hence not ...
  • On Minkowski Functionals of CMB polarization 
    Pravabati, C; Vidhya, G; Yogendran, K. P; Park, C (Elsevier B.V, 2017-08)
    CMB polarization data is usually analyzed using Eand Bmodes because they are scalar quantities under rotations along the lines of sight and have distinct physical origins. We explore the possibility of using the Stokes ...
  • Particle production during inflation: a Bayesian analysis with CMB data from Planck 2018 
    Naik, Suvedha Suresh; Furuuchi, Kazuyuki; Pravabati, C (IOP Publishing, 2022-07)
    A class of inflationary models that involve rapid bursts of particle productions predict observational signatures, such as bump-like features in the primordial scalar power spectrum. In this work, we analyze such models ...
  • Particle production during inflation: constraints expected from redshifted 21 cm observations from the epoch of reionization 
    Naik, Suvedha Suresh; Pravabati, C; Furuuchi, Kazuyuki (IOP Publishing, 2023-04)
    We examine a type of feature in the primordial scalar power spectrum, namely, the bump-like feature(s) that arise as a result of burst(s) of particle production during inflation. The latest CMB observations by Planck ...
  • Primordial non-Gaussian signatures in CMB polarization 
    Vidhya, G; Pravabati, C; Yogendran, K. P; Park, C (IOP Publishing, 2015-02)
    We study the signatures of local type primordial non-Gaussianity, parametrized by fNL, of scalar perturbations in CMB polarization using the probability distribution functions, Minkowski Functionals and Betti numbers. We ...
  • Prospects of constraining reionization model parameters using Minkowski tensors and Betti numbers 
    Akanksha, K; Pravabati, C; Ghara, Raghunath; Appleby, Stephen; Choudhury, T. R (IOP Publishing, 2021-05)
    We explore the possibility of constraining model parameters of the Epoch of Reionization (EoR) from 21cm brightness temperature maps, using a combination of morphological descriptors constructed from the eigenvalues of ...
  • Reheating in tachyonic inflationary models: Effects on the large scale curvature perturbations 
    Jain, R. K; Pravabati, C; Sriramkumar, L (Elsevier B.V., 2011-11)
    We investigate the problem of perturbative reheating and its effects on the evolution of the curvature perturbations in tachyonic inflationary models. We derive the equations governing the evolution of the scalar perturbations ...

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