RESEARCH INTERESTS


Core area
Relativity, Cosmology, Gravitation, Astronomy

Work area
Cosmological modelling, Dark energy modelling, Scalar field modelling, Modelling in modified theories of gravity (f(R, T), f(R), f(Q), f(Q,T) etc.).
Reconstructing cosmic evolution, Cosmological parametrization, Cosmological tests Cosmography, Observational constraints, Dynamical system analysis, Cosmological diagnostics, Energy Conditions.
Gravitational collapse, Exact solutions, Bouncing, Black hole and Worm hole solutions.
Radio Astronomy

Research Publications

2023: Cosmo-dynamics of dark energy models resulting from a parametrization of H in f (Q, T) gravity
Viraj Kalsariya, S. K. J. Pacif

Accepted for Publication in Euro Phys. J. Plus


2023: Some diagnostic analysis of dark energy models with q(z) parametrizations
Dhruv Arora, S. K. J. Pacif

Under review in Chinese Physics Letters


2023: Model-independent study for a quintessence model of dark energy: Analysis and Observational constraints
Amine Bouali, Himanshu Chaudhary, Amritansh Mehrotra, S. K. J. Pacif

Under review in Fortschritte der Physik.


2023: Astrophysical implications of an eternal homogeneous gravitational collapse model with a parametrization of expansion scalar
Annu Jaiswal, Rajesh Kumar, Sudhir Kumar Srivastava, S. K. J. Pacif

Accepted for publication in Euro. Phys. J. C


2023: Eternal homogeneous gravitational collapse: A comprehensive analysis from Θ parametrization
Annu Jaiswal, Rajesh Kumar, Sudhir Kumar Srivastava, S. K. J. Pacif

Under review in Euro. Phys. J. Plus


2023: Cosmological implications of an interacting model of dark matter & dark energy
Keshav Ram Mishra, S. K. J. Pacif, Rajesh Kumar, Kazuharu Bamba

Published in: Phys. Dark Univ. 40 (2023) 101211 arXiv: 2301.08743 [gr-qc]


2023: Generic Modification of Gravity, Late Time Acceleration and Hubble Tension
Mayukh R. Gangopadhyay, S. K. J. Pacif, Mohammad Sami, Mohit K. Sharma

Universe 9 (2023) 2, 83


2022: Late-time acceleration in f(Q) gravity: Analysis and constraints in an anisotropic background
M. Koussour, K. El Bourakadi, S.H. Shekh, S. K. J. Pacif, M. Bennai

Annals Phys. 445 (2022) 169092


2022: A New Parametrization of Hubble Parameter in f(Q)Gravity
M. Koussour, S. K. J. Pacif, M. Bennai, P. K. Sahoo

Fortsch.Phys. 71 (2023) 4-5, 2200172


2022: The oscillatory universe, phantom crossing and the Hubble tension
Mohit K. Sharma, S. K. J. Pacif, Gulmira Yergaliyeva, Kuralay Yesmakhanova

Annals Phys. 454 (2023) 169345


2022: Reconstructing cosmic evolution with a density parametrization
Ritika Nagpal, S. K. J. Pacif, Abhishek Parida

Mod. Phys. Lett. A 37 (2022) 18, 2250112


2021: Observational constraints on the massive neutrinos induced late-time cosmic acceleration
Mohit K. Sharma, S. K. J. Pacif, Shynaray Myrzakul, Zamzagul Shanina

Phys. Scripta 97 (2022) 8, 085010


2021: Cosmological aspects of f(R, T) gravity in a simple model with a parametrization of q
Ritika Nagpal, S. K. J. Pacif

Eur. Phys. J. Plus 136 (2021) 8, 875


2021: Bulk viscous matter and the cosmic acceleration of the universe in f(Q,T) gravity
Simran Arora, S. K. J. Pacif, Abhishek Parida, P.K. Sahoo

J. High Energy Astrohys. 33 (2022) 1-9


2021: Cosmic acceleration with bulk viscosity in modified f(Q) gravity
Raja Solanki, S. K. J. Pacif, Abhishek Parida, P. K. Sahoo

Phys. Dark Univ. 32 (2021) 100820


2021: Late-time acceleration with a scalar field source: Observational constraints and statefinder diagnostics
S. K. J. Pacif, Simran Arora, P. K. Sahoo

Phys. Dark Univ. 32 (2021) 100804


2020: Effective equation of state in modified gravity and observational constraints
Simran Arora, Xin-he Meng, S. K. J. Pacif, P. K. Sahoo

Class. Quant. Grav. 37 (2020) 20, 205022


2020: f(Q,T) gravity models with observational constraints
Simran Arora, S. K. J. Pacif, Snehasish Bhattacharjee, P. K. Sahoo

Phys. Dark Univ. 30 (2020) 100664


2020: Dark energy models from a parametrization of H: A comprehensive analysis and observational constraints
S. K. J. Pacif

Eur. Phys. J. Plus 135 (2020) 10, 792


2020: Accelerating Universe in Hybrid and Logarithmic Teleparallel Gravity
Sanjay Mandal, Snehasish Bhattacharjee, S. K. J. Pacif, P. K. Sahoo

Phys. Dark Univ. 28 (2020) 100551


2019: An Accelerating Cosmological Model from a Parametrization of Hubble Parameter
S. K. J. Pacif, Md Salahuddin Khan, L. K. Paikroy, Shalini Singh

Mod. Phys. Lett. A 35 (2019) 05, 2050011


2020: Viability of the R+e^T cosmology
P. H. R. S. Moraes, P. K. Sahoo, S. K. J. Pacif

Gen. Rel. Grav. 52 (2020) 4, 32


2018: Bouncing cosmology in f(R,T) gravity
J. K. Singh, Kazuharu Bamba, Ritika Nagpal, S. K. J. Pacif

Phys. Rev. D 97 (2018) 12, 123536


2018: Analysis with observational constraints in Λ-cosmology in f(R,T) gravity
Ritika Nagpal, S. K. J. Pacif, J. K. Singh, Kazuharu Bamba, A. Beesham

Eur. Phys. J. C 78 (2018) 11, 946


2019: Cosmic acceleration from coupling of baryonic and dark matter components: Analysis and diagnostics
Abhineet Agarwal, R. Myrzakulov, S. K. J. Pacif, M. Shahalam

Int. J. Mod. Phys. D 28 (2019) 06, 1950083


2017: Statefinder diagnostic for modified Chaplygin gas cosmology in f(R,T) gravity with particle creation
J. K. Singh, Ritika Nagpal, S. K. J. Pacif

Int. J. Geom. Meth. Mod. Phys. 15 (2017) 03, 1850049


2019: Cosmic acceleration sourced by modification of gravity without extra degrees of freedom
Abhineet Agarwal, R. Myrzakulov, S. K. J. Pacif, M. Sami, Anzhong Wang

Int. J. Geom. Meth. Mod. Phys. 16 (2019) 08, 1950128


2017: LRS Bianchi type-I cosmological model with constant deceleration parameter in f(R,T) gravity
BIinaya K. Bishi, S. K. J. Pacif, P. K. Sahoo, G. P. Singh

Int. J. Geom. Meth. Mod. Phys. 14 (2017) 11, 1750158


2018: Anisotropic cosmological models with two fluids
B. Mishra, Pratik P. Ray, S. K. J. Pacif

Adv. High Energy Phys. 2018 (2018) 6306848


2017: Dark Energy Cosmological Models with General forms of Scale Factor
B. Mishra, Pratik P. Ray, S. K. J. Pacif

Eur. Phys. J. Plus 132 (2017) 10, 429


2017: Dynamics of Bianchi VIh universe with bulk viscous fluid in modified gravity
B. Mishra, S Tarai, S. K. J. Pacif

Int. J. Geom. Meth. Mod. Phys. 15 (2017) 03, 1850036


2017: Cosmological parametrizations and their scalar field descendents
S. K. J. Pacif, K. Myrzakulov, R. Myrzakulov

Physics and Astronomy International Journal 1(6) (2017) 00038


2016: Bianchi type string cosmological models in f(R,T) gravity
P. K. Sahoo, B. Mishra, Parbati Sahoo, S. K. J. Pacif

Eur. Phys. J. Plus 131 (2016) 9, 333


2016: Reconstruction of cosmic history from a simple parametrization of H
S. K. J. Pacif, R. Myrzakulov, S. Myrzakul

Int. J. Geom. Meth. Mod. Phys. 14 (2017) 07, 1750111


2016: Galileons, phantom fields, and the fate of the Universe
M. Shahalam, S. K. J. Pacif, R. Myrzakulov

Eur. Phys. J. C 76 (2016) 7, 410


2015: FLRW non-singular cosmological model in general relativity
S. K. J. Pacif, Bivudutta Mishra

Res. Astron. Astrophys. 15 (2015) 12, 2141


2015: Anisotropic cosmological model with a specific form of Hubble parameter
S. K. J. Pacif, B. Mishra

Astrophys. Space Sci. 360 (2015) 2, 48


2014: On the simultaneous variation of some cosmological parameters in the presence of interacting dark energy
S. K. J. Pacif, Abdussattar

Eur. Phys. J. Plus 129 (2014) 11, 244


2011: An Exact chameleon cosmological model unifying phantom inflation with late-time acceleration
Absussattar, S. R. Prajapati

Int. J. Theor. Phys. 50 (2011) 2355


2011: Friedman-Robertson-Walker models with late-time acceleration
Abdussattar, S. R. Prajapati

Chin. Phys. Lett. 28 (2011) 029803


2011: LRS Bianchi type-I perfect fluid cosmological model with modified generalized Chaplygin gas equation of state
Abdussattar, S. R. Prajapati

Astrophys. Space Sci. 332 (2011) 455


2011: Role of deceleration parameter and interacting dark energy in singularity avoidance
Abdussattar, S. R. Prajapati

Astrophys. Space Sci. 331 (2011) 657


2024: All research papers in 2024


RESEARCH SUPERVISION/GUIDANCE


M.Sc. Dissertation/Thesis
Completed: 2
Ongoing: 0

Ph.D. Thesis
Completed: 0
Ongoing: 2
Guided 1

RESEARCH IDENTIFIERS


Google Scholar: https://scholar.google.com/citations?user=qeyPHMQAAAAJ

ArXiv: http://arxiv.org/a/pacif_s_1

Inspire: https://inspirehep.net/authors/1808341?ui-citation-summary=true

Scopus: https://www.scopus.com/authid/detail.uri?authorId=57218145555

Researcher ID: https://publons.com/researcher/2061498/shibesh-k-j-pacif/

Orcid: https://orcid.org/0000-0003-0951-414X

Research gate: https://www.researchgate.net/profile/Shibesh_Pacif

RESEARCH VISITS


International
University of Belgrade, Belgrade, Serbia, 09 – 14 Sept 2019
To attend the 10th Mathematical Physics Meeting: School and Conference on Modern Mathematical Physics & delivered a talk.

Yangzhou University, Yangzhou, China 18 – 20 Oct 2017
To attend the first symposium of the BRICS Association of Gravity, Astrophysics and Cosmology, Centre of Gravity and Cosmology.

National
Inter-University Centre for Astronomy and Astrophysics, Pune
02 April 2023 – 15 April 2023, 23 Dec 2022 – 31 Dec 2022, 01 Sept 2022 – 17 Sept 2022, 15 Aug 2018 – 15 Sept 2018, 24 Dec 2017 – 08 Jan 2018, 04 Jan 2017 – 09 Jan 2017, 14 Dec 2015 – 24 Dec 2015, 25 Nov 2013 – 05 Dec 2013, 25 Mar 2007 – 22 Apr 2007

International Centre for Cosmology, Gujarat, 18 – 23 Nov 2019

Centre for Theoretical Physics, New Delhi 09 – 10 Jul 2019

SCIENCE POPULARIZATION


Through different science popularization program initiatives, such as the Taramandal programs (mobile planetarium), science popularization Talks, invited talks, and visits to schools, I have so far interacted with over 30,000 children of age group 7 – 21 years.

Online Science Popularization Program (my Start-up),2020
With a motivation to develop scientific temper among children (and all citizens), I am conducting science popularization programs through some innovative ideas & action plans. In this direction, I am running an online science popularization program for school students & other enthusiastic students of age group 7-21 by delivering and arranging talks and discussions related to astronomy, astrophysics, cosmology, biology, coding (and few other areas of science).

SCI-POP Group-1 (Junior), https://chat.whatsapp.com/KVHhcxygaAk5aBfO18Bkui

SCI-POP Group-2 (Senior), https://chat.whatsapp.com/DeSTtM2CL1S3Fngc5gswGq

Science Popularization Program (at CCSP, SGTU),2021
Coordinator of the science popularization program of Centre for Cosmology and Science Popularization.

Web Link: https://www.ccspsgt.science/sp-talks

More than 80 science popularization Talks delivered both online and offline. Visited over 50 schools/colleges in various states in India and delivered talks on the theme “Knowing the Universe and Developing Scientific Temper”.

TARAMANDAL PROGRAM


I have conducted more than 30 Taramandal Programs (with my team). Visited many schools, invited some schools, and conducted Taramandal shows and interacted with over 20000 students in Taramandal program.

  • At SGT University, (7 days, 1800 Attendees) 24-30 May 2023
  • Students visits to SGTU, SGT University, (60 Attendees)
  • At Synergy2022, SGTU, A Tech Fest at SGT University, (3 days, 7000 Attendees)10-12 November 2022
  • At Cosmology@ccsp_1, The Inaugural Conference of CCSP (100 Attendees)19 October 2022
  • At Taramandal astronomy show, at SGT University, (2 days, 1000 Attendees)01-02 June 2022
    Web Link: https://www.ccspsgt.science/taramandal-program
  • At Centre for Theoretical Physics, Jamia Millia Islamia, New Delhi, (Conducted 22 programs at various Govt. schools near JMI and special schools in 2 Years, 2016-2018, 5000 Attendees) https://www.ctp-jamia.res.in/outreach/scipop.html
    Web Link: https://www.ctp-jamia.res.in/outreach/scipop.html

TELESCOPE SKY-WATCH


  • At CCSP Conference, 18 October 2022
  • At Telescope making workshop, CCSP, SGTU, 07 November 2022

PUBLIC SPEAKING


Delivering talks & lectures and conducting discussion sessions at various schools, colleges, institutions, Universities and other gatherings on astronomy and cosmology since the past several years.
Web Links:
https://www.ccspsgt.science/sp-talks
https://www.youtube.com/watch?v=D_L7W3j2zWI&t=1272s
https://www.youtube.com/watch?v=zd4mttilQqI&t=8s

MEDIA APPEARENCES


Appeared in newspaper “Dainik Jagaran” after my visit to DDU Gorakhpur University, Gorakhpur for delivering a memorial talk and a student’s talk,2023

Invited as a guest at a radio broadcast AWAZ the voice for a discussion on development of scientific temper and astronomy education.,2022
Web Links:
https://www.awazthevoice.in/podcost

Invited as a guest at the Rozender Science, a YouTube channel for a discussion on the topic “Astronomy and Astrology”2019
Web Links:
https://www.youtube.com/watch?v=BxEdK4M1LxM&t=119s