Associate Professor
Department of Physical Sciences
📍 AB1-2F1
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Research Area
General Relativity and Cosmology
Research Interests
My research interests are theoretical and observational aspects of dark energy. Understanding dark energy has been the focus of a flurry of activity for nearly two decades. This negative pressure component is required to drive the present day acceleration of the Universe, a fact which is confirmed by various observations. Since dark energy is an unknown component of the Universe, various models have been proposed to explain the acceleration of the Universe. Given a large number of models: and the relative lack of understanding, it becomes important to constrain and if possible rule out various models using observations. A large amount of data and the quality of observations available makes this task possible. I work on obtaining constraints on the cosmological parameters, especially constraining present day value of dark energy and its variation with redshift. On the theoretical front, I investigate is modified gravity models can be alternative explanation to the accelerated expansion of the Universe.
I am also interested in studying galaxy interactions and how these interactions affect star formation in the galaxies.
Since 2024 : Member, Executive Council, Indian Association for General Relativity and Gravitation
Since 2022 : Member, Executive Council, Astronomical Society of India
2010 - 2011 : Research Associate, IISER Mohali
2007 - 2010 : DST-WOSA Fellow, Harish Chandra Research Institute, Allahabad
2004 - 2007 : Visiting Fellow : Harish Chandra Research Institute, Allahabad
2001 - 2004 : Post Doctotal Fellow, IUCAA, Pune
2001 - 2001 : Post Doctoral Fellow, Harish Chandra Research Institute, Allahabad
1995 - 2000 : PhD, University of Delhi
1993 - 1995 : M.Sc., University of Delhi
1990 - 1993 : B. Sc. (Honours) Physics, S. G. T. B. Khalsa College, University of Delhi
Ranbir Sharma, Ankan Mukherjee and HK Jassal. Reconstruction of latetime cosmology using principal component analysis. The European Physical Journal Plus 137(2):219, 2022.
Avinash Singh, Archana Sangwan and HK Jassal. Low redshift observational constraints on tachyon models of dark energy. Journal of Cosmology and Astroparticle Physics 2019(04):047, 2019.
Archana Sangwan, Ankan Mukherjee and HK Jassal. Reconstructing the dark energy potential. Journal of Cosmology and Astroparticle Physics 2018(01):018, 2018.
Ashutosh Tripathi, Archana Sangwan and HK Jassal. Dark energy equation of state parameter and its evolution at low redshift. Journal of Cosmology and Astroparticle Physics 2017(06):012, 2017.
HK Jassal. Scalar field dark energy perturbations and the integrated Sachs-Wolfe effect. Physical Review D 86(4):043528, 2012.
HK Jassal. Evolution of perturbations in distinct classes of canonical scalar field models of dark energy. Physical Review D 81(8):083513, 2010.
HK Jassal. Comparison of perturbations in fluid and scalar field models of dark energy. Physical Review D 79(12):127301, 2009.
Sanil Unnikrishnan, HK Jassal and TR Seshadri. Scalar field dark energy perturbations and their scale dependence. Physical Review D 78(12):123504, 2008.
HK Jassal, JS Bagla and T Padmanabhan. WMAP constraints on low redshift evolution of dark energy. Monthly Notices of the Royal Astronomical Society: Letters 356(1):L11–L16, 2005.
JS Bagla, Harvinder Kaur Jassal and T Padmanabhan. Cosmology with tachyon field as dark energy. Physical Review D 67(6):063504, 2003.