Dr. Rajesh Kumar

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Academic Career Length

9Years (2018-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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5 June 2024 in Living Reviews in Relativity

Journal Article

Theoretical and experimental constraints for the equation of state of dense and hot matter

Rajesh Kumar

Veronica Dexheimer

Johannes Jahan

Jorge Noronha

Jacquelyn Noronha-Hostler

MUSES Collaboration

+55

This review aims at providing an extensive discussion of modern constraints relevant for dense and hot strongly interacting matter. It includes theoretical first-principle results from lattice and perturbative QCD, as well as chiral effective field theory results. From the experimental side, it includes heavy-ion collision and low-energy nuclear physics results, as well as observations from neutron stars and their mergers. The validity of different constraints, concerning specific conditions and ranges of applicability, is also provided.

14 May 2019 in The European Physical Journal C

Journal Article

$$J/\psi $$ and $$\eta _c$$ in asymmetric hot magnetized nuclear matter: a unified approach of Chiral SU(3) model and QCD sum rules

Rajesh Kumar

Arvind Kumar

We investigate the mass-shift of vector channel [equation] and pseudoscalar channel [equation] in strongly magnetized asymmetric nuclear medium at finite temperature using the conjunction of chiral SU...

10 April 2024 in Physical Review D

Journal Article

Modern nuclear and astrophysical constraints of dense matter in a redefined chiral approach

Rajesh Kumar

Yuhan Wang

Nikolas Cruz Camacho

Arvind Kumar

Jacquelyn Noronha-Hostler

Veronica Dexheimer

We explore the quantum chromodynamics (QCD) phase diagram’s complexities, including quark deconfinement transitions, liquid-gas phase changes, and critical points by using the chiral mean-field (CMF) model that is able to capture all these features. We introduce a vector meson field redefinition within the CMF framework, enabling precise adjustments of meson masses and coupling strengths related to vector meson interactions. Performing a new fit to the deconfinement potential, we are able to replicate recent lattice QCD results, low-energy nuclear physics properties, neutron star observational data, and key phase diagram features as per modern constraints. This approach enhances our understanding of vector mesons’ roles in mediating nuclear interactions and their impact on the equation of state, contributing to a more comprehensive understanding of the QCD phase diagram and its implications for nuclear and astrophysical phenomena.

19 May 2025 in Physical Review D

Journal Article

Building neutron stars with the MUSES calculation engine

Mateus Reinke Pelicer

Nikolas Cruz-Camacho

Carlos Conde-Ocazionez

David Friedenberg

Satyajit Roy

Nicolás Yunes

+22

20 May 2025 in Physical Review D

Journal Article

Phase stability in the three-dimensional open-source code for the chiral mean-field model

Nikolas Cruz-Camacho

Rajesh Kumar

Mateus Reinke Pelicer

Jeff Peterson

T. Andrew Manning

Jaquelyn Noronha-Hostler

8 January 2020 in Physical Review C

Journal Article

Analysis of pseudoscalar and scalar

D

mesons and charmonium decay width in hot magnetized asymmetric nuclear matter

Rajesh Kumar

Arvind Kumar

In this paper, we calculate the mass shift and decay constant of isospin-averaged pseudoscalar

(D^{+}, D^{0})

and scalar

(D_{0}^{+}, D_{0}^{0})

mesons by the magnetic-field-induced quark and gluon condensates at finite density and temperature of asymmetric nuclear matter. We have calculated the in-medium chiral condensates from the chiral

SU (3)

mean-field model and subsequently used these condensates in QCD sum rules to calculate the effective mass and decay constant of

D

mesons. Consideration of external magnetic-field effects in hot and dense nuclear matter lead to appreciable modification in the masses and decay constants of

D

mesons. Furthermore, we also studied the effective decay width of higher charmonium states

[ψ (3686), ψ (3770), {χ_{c}}_{0} (3414), {χ_{c}}_{2} (3556)]

as a by-product by using the

{}^{3}P_{0}

model, which can have an important impact on the yield of

J / ψ

mesons. The results of the present work will be helpful to understand the experimental observables of heavy-ion colliders which aim to produce matter at finite density and moderate temperature.

About Me

I am Dr. Rajesh Kumar, a nuclear astrophysicist and postdoctoral fellow at Kent State University. I hold a Ph.D. in Physics from Dr B R Ambedkar National Institute of Technology Jalandhar India, where my research focused on adronh dynamics in nuclear matter. My work spans neutron stars, quark matter, neutrino transport, and the equation of state of dense matter, with contributions to open-source scientific software, particularly in the Chiral Mean Field (CMF) model. Previously, I served as an Assistant Professor in India, teaching electrodynamics and astrophysics at both undergraduate and graduate levels. My research has been supported by the National Science Foundation (NSF), and I have collaborated with international researchers within the MUSES project. I have co-authored multiple publications, including work on meson dynamics, neutron star equations of state, and CMF++, an open-source model integrated into the MUSES framework. I have delivered plenary talks and presented at several international conferences, discussing dense matter physics, hybrid stars, and transport properties. As a reviewer for a physics journal, I contributed to the peer-review process, ensuring the dissemination of high-quality research.

Dr. Rajesh Kumar

Dr. Rajesh Kumar

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