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Krishnendu Mukherjee

Publications and source records attributed to Krishnendu Mukherjee.

12 recordsLinked to original sources
arXiv2026

Dynamical generation of fermion mass in a scalar-fermion theory with ${\lambda}{\phi}^4$ interaction

The effective potential for a scalar theory with $\lambda\phi^4$ interaction, coupled to a massless fermion through Yukawa interaction is calculated by summing over infinite number of two particle irreducible (2PI) diagrams of two different types and a 2PI diagram of a third type using Cornwall, Jackiw and Tomboulis (CJT) method. There is an inversion symmetry present in the effective potential under $\phi\rightarrow -\phi$. When the value of coupling constant falls beyond an open set of positive real numbers, the effective potential exhibits both maxima and minima above and below the zero potential line respectively on either side of its minimum at $\phi=0$. The fermion acquires a mass in this region of coupling constant when the system settles into the minimum at positive, non-zero $\phi$ breaking the inversion symmetry of the vacuum. However, the effective potential exhibits a minimum only at $\phi=0$ and also the fermion remains massless when the coupling constant assumes any value from this open set.

hep-th↗
arXiv2021

Sequential Design of Adsorption Simulations in Metal-Organic Frameworks

The large number of possible structures of metal-organic frameworks (MOFs) and their limitless potential applications has motivated molecular modelers and researchers to develop methods and models to efficiently assess MOF performance. Some of the techniques include large-scale high-throughput molecular simulations and machine learning models. Despite those advances, the number of possible materials and the potential conditions that could be used still pose a formidable challenge for model development requiring large data sets. Therefore, there is a clear need for algorithms that can efficiently explore the spaces while balancing the number of simulations with prediction accuracy. Here, we present how active learning can sequentially select simulation conditions for gas adsorption, ultimately resulting in accurate adsorption predictions with an order of magnitude less number of simulations. We model adsorption of pure components methane and carbon dioxide in Cu-BTC. We employ Gaussian process regression (GPR) and use the resulting uncertainties in the predictions to guide the next sampling point for molecular simulation. We outline the procedure and demonstrate how this model can emulate adsorption isotherms at 300 K from $10^{-6}$ to 300 bar (methane)/100 bar (carbon dioxide). We also show how this procedure can be used for predicting adsorption on a temperature-pressure phase space for a temperature range of 100 to 300 K, and pressure range of $10^{-6}$ to 300 bar (methane)/100 bar (carbon dioxide)

cond-mat.mtrl-sci↗
arXiv2018

Stable, finite energy density solutions in the effective theory of non-abelian gauge fields

We consider the gauge fixed partition function of pure $SU(N_c)$ gauge theory in axial gauge following the Halpern's field strength formalism. We integrate over $3 (N_c^2-1)$ field strengths using the Bianchi identities and obtain an effective action of the remaining $3 (N_c^2-1)$ field strengths in momentum space. We obtain the static solutions of the equations of motion (EOM) of the effective theory. The solutions exhibit Gaussian nature in the $z$ component of momentum and are proportional to the delta functions of the remaining components of momentum. The solutions render a finite energy density of the system and the parameters are found to be proportional to fourth root of the gluon condensate. It indicates that the solutions offer a natural mass scale in the low energy phase of the theory.

hep-th↗
arXiv2016

Heat transport in an anharmonic crystal

We take an ordered, anharmonic crystal in the form of slab geometry in three dimensions. Apart from attaching baths of Langevin type to the extreme surfaces, we also attach baths of same type to the intermediate surfaces of the slab to simulate the environment surrounding the system. We assume noise functions to be Gaussian and their widths to be site dependent. We find that the radiated heat from the slab does not receive any correction at the leading order of anharmonic coupling and the Newton's law of cooling holds for an appropriate choice of the widths. We observe that in the steady state limit entire slab becomes an assembly of $N$ different thermally equilibriated layers, where $N$ is the number of sites in the direction of conduction current flow. We find an exponentially falling nature of the temperature profile as its leading behaviour and its non-leading behaviour is governed by the two site dependent functions. Our evaluation suggests that in the thermodynamic limit thermal conductivity remains independent of the environment temperature and is dependent only on the difference of temperature of the extreme surfaces linearly at the leading order of anharmonic coupling. We find that owing to finiteness of conductivity in the thermodynamic limit, Fourier's law holds to leading order in anharmonic coupling.

cond-mat.stat-mech↗
arXiv2013

Heat transport in a three dimensional slab geometry and the temperature profile of Ingen-Hausz's experiment

We study the transport of heat in a three dimensional harmonic crystal of slab geometry whose boundaries and the intermediate surfaces are connected to stochastic, white noise heat baths at different temperatures. Heat baths at the intermediate surfaces are required to fix the initial state of the slab in respect of its surroundings. We allow the flow of energy fluxes between the intermediate surfaces and the attached baths and impose conditions that relate the widths of the Gaussian noises of the intermediate baths. The radiated heat obeys Newton's law of cooling when intermediate baths collectively constitute the environment surrounding the slab. We show that Fourier's law holds in the continuum limit. We obtain an exponentially falling temperature profile from high to low temperature end of the slab and this very nature of the profile was already confirmed by Ingen Hausz's experiment. Temperature profile of similar nature is also obtained in the one dimensional version of this model.

cond-mat.stat-mech↗
arXiv2011

Fourier's law of heat conduction in a three dimensional harmonic crystal: A retrospection

We present an exact solution of the Langevin's equation in the steady state limit in a three dimensional, harmonic crystal of slab geometry whose boundary surfaces along its length are connected to two stochastic, white noise heat baths at different temperatures. We show that the heat trasport obeys the Fourier's law in the continuum limit.

cond-mat.stat-mech↗
arXiv2001

Susceptibilities to order $α_s$ in the high density phase of QCD

We compute the free energy density of QCD to order $α_s$ at very high density and non-zero quark masses. The counterterms needed to renormalise the theory to order $α_s$ is same as the vacuum (non-zero density) theory. We investigate the response of the theory to non-zero quark masses and chemical potentials. We study quark number density and quark number susceptibility in the high density limit, where the ratio of the quark mass to the corresponding chemical potential is very small ($m/μ\ll 1$). In this limit both number density and susceptibility contain a $\ln(m/μ)$ contribution at order $α_s$. We compute the scalar and pseudoscalar susceptibilities to order $α_s$ in three flavour QCD at high density taking quark masses and chemical potentials to be degenerate and non-zero. At extremely high density, since $α_s$ is very small, both the susceptibilities are found to be same in the chiral limit. This means that the scalar-pseudoscalar splitting is absent in the CFL phase.

hep-ph↗
arXiv2000

Jet rates in the hard scattering process at finite temperature

We compute the cross-section of the hadronic jets arising from the quark antiquark pair which are produced from a hard photons (of 4-momentum $q$) in the plasma, predominantly consisting of thermalised quarks and gluons. The quark antiquark pair is hard and scattered off the heat bath to form jets, while the gluons being soft get thermalised in the heat bath. The infrared divergences cancel in the observable cross-section to $α_s$ order, which includes the process of emission and absorption of real gluons. Since the massless quark antiquark pair is hard the Compton scattering processes are absent in the heat bath and it renders an uncancelled collinear divergent piece in the cross-section. We regularize it by eliminating the collinear region from the phase space and write it in terms of jet parameters. The temperature dependent part of the jet cross-section is regular at large ${\sqrt{q^2}\over T}$ and vanishes when ${\sqrt{q^2}\over T}\to \infty$. Since jets carry the thermal signature of the hot plasma the jet production rate can be used as a thermometer of the heat bath.

hep-ph↗
arXiv1999

Rho parameters from odd and even chirality, thermal QCD sum rules

Like the even chirality correlation functions of, say, the two vector currents, one can also consider odd chirality correlation functions to write thermal QCD sum rules. They contain fewer non-perturbative corrections, at least to the leading order. Here we write such a sum rule for the correlation function of vector and tensor 'currents'. The odd and even chirality sum rules are taken together to evaluate the effective parameters of the $ρ$ meson to second order in temperature. To within errors, the results are consistent and reproduce the absence of shift in the $ρ$ meson mass to this order.

hep-ph↗
arXiv1998

Gap equation in scalar field theory at finite temperature

We investigate the two-loop gap equation for the thermal mass of hot massless $g^2ϕ^4$ theory and find that the gap equation itself has a non-zero finite imaginary part. This indicates that it is not possible to find the real thermal mass as a solution of the gap equation beyond $g^2$ order in perturbation theory. We have solved the gap equation and obtain the real and the imaginary part of the thermal mass which are correct up to $g^4$ order in perturbation theory.

hep-th↗
arXiv1998

QCD sum rules at finite temperature

We derive thermal QCD sum rules for the correlation function of two vector currents in the rho-meson channel. It takes into account the leading non-perturbative corrections from the additional operators, which appear due to the breakdown of Lorentz invariance at finite temperature. The mixing of the new operators has a drastic effect on their coefficients. The thermal average of all the operators can be related to that of the quark condensate and the energy density. The sum rules then yield the temperature dependence of the parameters of the $ρ$-meson, namely its mass and coupling to the vector current. Our result is that these parameters are practically independent of temperature at least up to a temperature of 125 MeV.

hep-ph↗