Browsing Journal Articles by Title

Browsing Journal Articles by Title

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  • Ultrafast Airy beam optical parametric oscillator 
    Apurv Chaitanya, N.; Chaitanya Kumar, S.; Aadhi, A.; Samanta, Goutam Kumar; Ebrahim-Zadeh, M. (Nature Publishing Group, 2016-08)
    We report on the first realization of an ultrafast Airy beam optical parametric oscillator (OPO). By introducing intracavity cubic phase modulation to the resonant Gaussian signal in a synchronously-pumped singly-resonant ...
  • Ultrafast optical vortex beam generation in the ultraviolet 
    Apurv Chaitanya, N.; Devi, Kavita; Samanta, Goutam Kumar; Ebrahim-Zadeh, M.; Suddapalli, Chaitanya Kumar D. (OSA Publishing, 2016-01)
    We report on the generation of ultrafast vortex beams in the deep ultraviolet (DUV) wavelength range at 266 nm, for the first time to our knowledge. Using a Yb-fiber-based green source in combination with two spiral phase ...
  • Understanding photon sphere and black hole shadow in dynamically evolving spacetimes 
    Mishra, Akash K.; Chakraborty, Sumanta; Sarkar, Sudipta (APS, 2019-05)
    We have derived the differential equation governing the evolution of the photon sphere for dynamical black hole spacetimes with or without spherical symmetry. Numerical solution of the same depicting evolution of the photon ...
  • Understanding the masses and mixings of one-zero textures in 3+1 scenario 
    Nath, Newton; Ghosh, Monojit; Gupta, Shivani (World Scientific Publishing, 2016-08)
    We present a detailed analysis and phenomenological consequences of neutrino mass matrix, MνMν, with one-zero texture in the flavor basis where the active neutrino sector is extended by one sterile neutrino (3+1 case). In ...
  • Universal local operator quenches and entanglement entropy 
    Bhattacharyya, Arpan; Takayanagi, Tadashi; Umemoto, Koji (Springer Verlag, 2019-11)
    We present a new class of local quenches described by mixed states, parameterized universally by two parameters. We compute the evolutions of entanglement entropy for both a holographic and Dirac fermion CFT in two dimensions. ...
  • Upper limits on gravitational waves from scorpius X-1 from a model-based cross-correlation search in Advanced LIGO data 
    Sengupta, Anand (IOP Publishing, 2017-09)
    We present the results of a semicoherent search for continuous gravitational waves from the low-mass X-ray binary Scorpius X-1, using data from the first Advanced LIGO observing run. The search method uses details of the ...
  • Upper limits on the rates of binary neutron star and neutron star–black hole mergers from advanced LIGO’s first observing run 
    Sengupta, Anand (American Physical Society, 2016-11)
    We report here the non-detection of gravitational waves from the merger of binary–neutron star systems and neutron star–black hole systems during the first observing run of the Advanced Laser Interferometer Gravitational-wave ...
  • Upper limits on the stochastic gravitational-wave background from advanced LIGO’s first observing Run 
    Sengupta, Anand (American Physical Society, 2017-03)
    A wide variety of astrophysical and cosmological sources are expected to contribute to a stochastic gravitational-wave background. Following the observations of GW150914 and GW151226, the rate and mass of coalescing binary ...
  • Using Nanomagnetic Fluid for Corrosion Inhibition of Mild Steel 
    Jauhari, Smita; Parekh, Kinnari; Pai, K.B.; Upadhyay, Ramesh V. (National Association of Corrosion Engineers, 2010)
    Nanomagnetic fluid (ferromagnetic nanoparticles) which has been evaluated as a corrosion inhibitor and the corrosion behavior of carbon steel in 1 M sulfuric acid (H2S04) is discussed. The nanomagnetic fluid was synthesized ...
  • Validation of δ18O as a proxy for past monsoon rain by multi-GCM simulations 
    Midhun, M.; Ramesh, R. (Springer, 2016-03)
    Stable oxygen isotope ratios (δ18O) of tree cellulose and speleothem carbonate are useful proxies for past monsoon rain in many tropical regions, as a decrease in rain δ18O is observed with increase in rainfall on a monthly ...
  • Variability of atmospheric carbonyl sulfide at a semi-arid urban site in western India 
    Mallika, Chinmay; Chandra, Naveen; Venkataramani, S.; Lal, Shyam (Elsevier, 2016-05)
    Atmospheric carbonyl sulfide (COS) is a major precursor for sulfate aerosols that play a critical role in climate regulation. Recent studies have highlighted the importance of COS measurements as a reliable means to constrain ...
  • Vertical coupling of atmospheres: dependence on strength of sudden stratospheric warming and solar activity 
    Laskar, Fazlul I.; Pallamraju, Duggirala; Veenadhari, Bhaskara (Terra Scientific Publishing Company, 2014-08)
    Comprehensive behavior of the low-latitude upper atmosphere during sudden stratospheric warming (SSW) events at varying levels of solar activity has been investigated. The equatorial electrojet (EEJ) strength and the total ...
  • Violation of bell's inequality for phase-singular beams 
    Prabhakar, Shashi; Salla, Gangi Reddy; Aadhi, A.; Perumangatt, Chithrabhanu; Samanta, Goutam Kumar; Singh, Ravindra P. (American Physical Society, 2015-08)
    We have considered optical beams with phase singularity and experimentally verified that these beams, although classical, have properties of two-mode entanglement in quantum states. We have observed the violation of Bell's ...
  • Viscosity calculations from hadron resonance gas model: Finite size effect 
    Ghosh, Snigdha; Samanta, Subhasis; Ghosh, Sabyasachi; Mishra, Hiranmaya (World Scientific Publishing, 2019-06)
    We have attempted to review on microscopic calculation of transport coefficients like shear and bulk viscosities in the framework of hadron resonance gas (HRG) model, where a special attention is explored on the effect of ...
  • Viscosity in cosmic fluids 
    Natwariya, Pravin Kumar; Bhatt, Jitesh R.; Pandey, Arun Kumar (Springer, 2020-08)
    The effective theory of large-scale structure formation based on CDM paradigm predicts finite dissipative effects in the resulting fluid equations. In this work, we study how viscous effect that could arise if one includes ...
  • Viscous dark matter and 21 cm cosmology 
    Bhatt, Jitesh R.; Mishra, Arvind Kumar; Nayak, Alekha C. (American Physical Society, 2019-09)
  • Viscous self interacting dark matter and cosmic acceleration 
    Atreya, Abhishek; Bhatt, Jitesh R.; Mishra, Arvind (IOP Publishing, 2018-02)
    Self interacting dark matter (SIDM) provides us with a consistent solution to certain astrophysical observations in conflict with collision-less cold DM paradigm. In this work we estimate the shear viscosity (η) and bulk ...
  • Viscous self interacting dark matter cosmology for small redshift 
    Atreya, Abhishek; Bhatt, Jitesh R.; Mishra, Arvind (IOP Publishing, 2019-02)
    The viscosity of dark matter in cosmological models may cause an accelerated expansion and when this effect is sufficiently large, it can explain the dark energy. In this work, attributing the origin of viscosity to ...
  • Water-ice exposing scarps within the northern mid?latitude craters on Mars 
    Harish; Vijayan, S.; Mangold, N.; Bhardwaj, Anil (American Geophysical Union, 2020-07)
    We report new exposures of water?ice along the scarps wall located within craters in the northern mid?latitude region of Mars using high?resolution imagery and spectral data of Mars Reconnaissance Orbiter. The exposed ...
  • Wigner-Kirkwood method for microscopic-macroscopic calculation of binding energies 
    Bhagwat, Ameeya A.; Vinas, X.; Wyss, R.; Schuck, P. (World Scientific Publishing, 2010-04)
    We propose to use the semi-classical Wigner-Kirkwood ħ expansion to calculate shell corrections for spherical and deformed nuclei. The expansion is carried out up to fourth order in ħ. A systematic study of Wigner-Kirkwood ...

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