Dr. Nandan Roy

Personal Webpage

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 Education

• 2010 – 2015, Ph.D. Indian Institute of Science Education and Research Kolkata,Supervisor: Prof. Narayan Banerjee
• 2006 – 2008, M.Sc (Physics)Vidyasagar University
• 2002 – 2006, B.Sc (Physics)Midnapore College, Vidyasagar University

Post Doctoral Experiences

• October 2016 – July 2018The Department of Physical Sciences, Campus Leon, University of Guanajuato, Mexico
• April 2015 – September 2016Harish-Chandra Research Institute, Allahabad, India

Research Interest

The general topics of my research interest are cosmology, general relativity, and dynamical systems analysis. At present, I am working to find out the true nature of dark energy. Recently our universe has entered into an accelerated expansion phase and the reason behind it is unknown. The component of the universe which drives this accelerated expansion of the universe is generally called dark energy and almost 70% of the universe is dominated by this mysterious component. So personally to me, investigations of the true nature of dark energy are very important.

List of topics

• Study of different dark energy models using cosmological data and dynamical systems analysis.
• Application of dynamical systems analysis to general relativity and cosmology.
• Application of dynamical systems analysis to general relativity and cosmology.
• Study of the critical phenomenon in general relativity.

Postdoctoral Supervision:
Name: Dr. Masroor c. Pookkillath
PhD: Yukawa Institute for Theoretical Physics, Kyoto University, Japan

 PhD thesis supervision:
1. Miss. Phusuda Thanankullapong

2. Phichayoot Baisri (DPST Scholar)

3. Mr. Prasanta Sahoo (Co-supervising)

MS thesis supervision:

Supervised jointly with Dr. Luis Urena Lopez at Universidad de Guanajuato.
Name: Mr. Jose Alberto Gonzalez Bernal
Thesis Title: Alternative models of dark energy

Journal Referee

Modern Physics Letter A

Annals of Physics

Arxiv preprint

• Second Order Perturbative Effects on the Acoustic Geometry, Nandan Roy, Shivani Singh, Sankhasubhra Nag, Tapas K. Das, e-Print: 1803.05312 [gr-qc]

List of Publications

See my publications in Arxiv, Inspire Hep, Google Scholar.

1. Quintessence or Phantom: Study of scalar field dark energy models through a general parametrization of the Hubble parameter Nandan Roy (Mahidol U.), Sangita Goswami (Visva Bharati U.), Sudipta Das (Visva Bharati U.), e-Print: 2201.09306 [astro-ph.CO].  Published in:   Physics of the Dark Universe, Volume 36, June 2022, 101037
2. Tracker phantom field and a cosmological constant: Dynamics of a composite dark energy model Francisco X. Linares Cedeño, Nandan Roy, L. Arturo Ureña-López ,e-Print: 2105.07103 [astro-ph.CO] DOI: 10.1103/PhysRevD.104.123502 (publication) Published in: Phys.Rev.D 104 (2021) 12, 123502
3. Generalized tracker quintessence models for dark energy L. Arturo Ureña-López (Guanajuato U.), Nandan Roy (Naresuan U.), e-Print: 2007.08873 [astro-ph.CO] DOI: 10.1103/PhysRevD.102.063510 Published in: Phys.Rev.D 102 (2020) 6, 063510
4. Dynamical System Analysis for Steep Potentials Sudipta Das, Manisha Banerjee, Nandan Roy, e-Print: 1903.02288 [gr-qc] DOI: 10.1088/1475-7516/2019/08/024 Published in: JCAP 08 (2019), 024.
5. Arbitrariness of potentials in interacting quintessence models, Nandan Roy (Naresuan U.), Kazuharu Bamba (Fukushima U.), e-Print: 1811.03234 [astro-ph.CO], DOI: 10.1103/PhysRevD.99.123520, Published in: Phys.Rev.D 99 (2019) 12, 123520
6. New general parametrization of quintessence fields and its observational constraints,Nandan Roy (Guanajuato U.), Alma X. Gonzalez-Morales (Guanajuato U.), L. Arturo Urena-Lopez (Guanajuato U.), e-Print: 1803.09204 [gr-qc], DOI: 10.1103/PhysRevD.98.063530, Published in: Phys.Rev.D 98 (2018) 6, 063530
7. Dynamical systems analysis of phantom dark energy models, Nandan Roy (Guanajuato U.), Nivedita Bhadra (IISER, Kolkata), e-Print: 1710.05968 [gr-qc], DOI: 10.1088/1475-7516/2018/06/002, Published in: JCAP 06 (2018), 002
8. Extended Phase Space Analysis of Interacting Dark Energy Models in Loop Quantum Cosmology, Hmar Zonunmawia (Northeastern Hill U., Shillong), Wompherdeiki Khyllep (M.N. College), Nandan Roy (Guanajuato U. and Harish-Chandra Res. Inst.), Jibitesh Dutta (Northeastern Hill U., Shillong and IUCAA, Pune), Nicola Tamanini (IPhT, Saclay), e-Print: 1708.07716 [gr-qc], DOI: 10.1103/PhysRevD.96.083527, Published in: Phys.Rev.D 96 (2017) 8, 083527
9. Generalized Brans-Dicke Theory: A Dynamical Systems Analysis, Nandan Roy, Narayan Banerjee, e-Print: 1702.02169 [gr-qc], DOI: 10.1103/PhysRevD.95.064048, Published in: Phys.Rev.D 95 (2017) 6, 064048
10. Dynamical Systems Analysis of Various Dark Energy Models , Nandan Roy (IISER, Kolkata),e-Print: 1511.07978 [gr-qc]
11. Stability analysis of a holographic dark energy model, Narayan Banerjee (IISER, Kolkata), Nandan Roy (IISER, Kolkata), DOI: 10.1007/s10714-015-1933-1, Published in: Gen.Rel.Grav. 47 (2015) 8, 92
12. Dynamical systems study of Chameleon scalar field, Nandan Roy (IISER, Kolkata), Narayan Banerjee (IISER, Kolkata), e-Print: 1411.1164 [gr-qc], DOI: 10.1016/j.aop.2015.03.013, Published in: Annals Phys. 356 (2015), 452-466
13. Quintessence Scalar Field: A Dynamical Systems Study, Nandan Roy (IISER, Kolkata), Narayan Banerjee (IISER, Kolkata), e-Print: 1402.6821 [gr-qc], DOI: 10.1140/epjp/i2014-14162-7, Published in: Eur.Phys.J.Plus 129 (2014), 162
14. Tracking quintessence: a dynamical systems study, Nandan Roy (IISER, Kolkata), Narayan Banerjee (IISER, Kolkata), e-Print: 1312.2670 [gr-qc], DOI: 10.1007/s10714-013-1651-5, Published in: Gen.Rel.Grav. 46 (2014), 1651

 

Teaching Experience

Following is the list of courses that I have taught throughout my academic career.

• Currently teaching Waves and Fluid dynamics, and Equilibrium Statistical Mechanics and Kinetic Theory at The Institute for Fundamental Study, Naresuan University, (Level:PG).
• Waves and Fluid dynamics, The Institute for Fundamental Study, Naresuan University in the spring semester 2019 (Level: PG).
• Introduction to cosmology, The Institute for Fundamental Study, Naresuan University in the fall semester 2018 (Level: PG).
• Equilibrium Statistical Mechanics and Kinetic Theory, The Institute for Fundamental Study, Naresuan University in the fall semester 2018 (Level: PG)
• Cosmology, Universidad De Guanajuato Campus Leon, Mexico in the spring semester 2017(Level: UG).
• Teaching assistant at IISER Kolkata: Physics I, titled Mechanics, Course instructor: Prof. Amitava Dutta (Level: UG).
• Teaching assistant at IISER Kolkata: Physics II, titled Electromagnetism, Course instructor: Dr. Dibyendu Nandi (Level: UG).
• Part-time lecturer, Midnapore college and Raja N L Khan Women’s college,
• Midnapore, West Bengal, India: Statistical mechanics, mathematical physics, electromagnetism, and physics practical classes to the undergraduate students (Level: UG).

Supervision of project students and M.Sc thesis

• Supervised one MS thesis student jointly with Dr. Luis Urena Lopez at Universidad de Guanajuato.

Name: Mr. Jose Alberto Gonzalez Bernal

Thesis Title: Alternative models of dark energy

• Following students have worked jointly with me and Dr. Tapas Das, Associate Professor, under Visiting Student Research Programme (VSRP) in Harish Chandra Research Institute, Allahabad:

Name:  MS Shivani Singh from IIT Hyderabad.

Name:  Mr.Arindam Chakrabarti from North Bengal University.