Articles written in Pramana – Journal of Physics
Volume 51 Issue 1-2 July 1998 pp 273-286
Subhendra Mohanty Varun Sahni S Chakraborty Ashok Goyal Sukanta Dutta Debajyoti Choudhury Shobhit Mahajan Amitabha Mukherjee Hatem Widyan Urjit Yajnik S Mohanty J A Grifols Uma Mahanta Sarira Sahu Varun Sahni Tarun Souradeep Albert Stebbins Ioav Waga Vikram Soni N Panchapakesan R Brandenberger
The astroparticle physics working group witnessed intense discussion and activity covering a broad range of topics ranging from supergravity and baryogenesis to compact stars and the large scale structure of the Universe. A summary of some of the subject areas in which collaborations were initiated during WHEPP-5 is presented below.
Volume 60 Issue 3 March 2003 pp 453-459
In this paper, a study on string theory has been done in five-dimensional space-time based on Lyra geometry. Also a polynomial relation between the two scale factors is assumed. The equations of state for strings have been used for different solutions
Volume 60 Issue 6 June 2003 pp 1153-1159
A class of cosmological solutions of massive strings for the Bianchi-IX space-time are obtained within the framework of Lyra geometry. Various physical and kinematical properties of the models are discussed
Volume 64 Issue 3 March 2005 pp 443-454
We report our experimental observations of the Shil’nikov-type homoclinic chaos in asymmetry-induced Chua’s oscillator. The asymmetry plays a crucial role in the related homoclinic bifurcations. The asymmetry is introduced in the circuit by forcing a DC voltage. For a selected asymmetry, when a system parameter is controlled, we observed transition from large amplitude limit cycle to homoclinic chaos via a sequence of periodic mixed-mode oscillations interspersed by chaotic states. Moreover, we observed two intermediate bursting regimes. Experimental evidences of homoclinic chaos are verified with PSPICE simulations.
Volume 76 Issue 5 May 2011 pp 693-698
Raghavan Rangarajan Ajit Srivastava A Bandyopadhyay A Basak M Bastero-Gil A Berera J Bhatt K Bhattacharya S Chakraborty M Das S Das K Dutta D Ghosh S Goswami U Gupta P Jain Y-Y Keum E Masso D Majumdar A P Mishra S Mohanty R Mohapatra A Nautiyal T Prokopec S Rao D P Roy N Sahu A Sarkar P Saumia A Sen A Shivaji
This is the report of the cosmology and astroparticle physics working group at WHEPPXI. We present the discussions carried out during the workshop on selected topics in the above ﬁelds. The problems discussed concerned axions, infrared divergences in inﬂationary theories, supersonic bubbles in a ﬁrst-order electroweak phase transition, dark matter, MOND, interacting dark energy, composite Higgs models and statistical anisotropy of the Universe.
Volume 96, 2022
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