arXiv subjects

Ravikant Verma

Publications and source records attributed to Ravikant Verma.

8 recordsLinked to original sources

arXiv2019

Effect of Non-commutativity of space-time on Thermodynamics of Photon gas

Doubly special relativity(DSR) introduce a minimal length scale i.e. the Planck length scale, which is independent length scale in addition to the speed of light in the normal special theory of relativity(STR). Doubly special relativity leads to study the $κ$-Minkowski space-time. In this paper, we present the result of our investigation on the thermodynamics of photon gas in the $κ$-Minkowski space-time. For studying this, we start with the $κ$-deformed dispersion relation and keep terms upto first order in the deformation parameter $a$ and we study that how does $κ$-deformed dispersion relation affect the thermodynamics of photon gas. In the limit, deformation parameter $a \rightarrow 0$, we get back all the results in the special theory of relativity(STR)\cite{partition}.

physics.gen-ph↗

arXiv2018

Particle Dynamics and Lie-algebraic type of Non-commutativity of space-time

In this paper, we present the results of our investigation relating particle dynamics and non-commutativity of space-time by using Dirac's constraint analysis. In this study, we re-parameterise the time $t=t(τ)$ along with $x=x(τ)$ and treat both as configuration space variables. Here, $τ$ is a monotonic increasing parameter and the system evolves with this parameter. After constraint analysis, we find the deformed Dirac brackets similar to the $κ$-deformed space-time and also, get the deformed Hamilton's equations of motion. Moreover, we study the effect of non-commutativity on the generators of Galilean group and Poincare group and find undeformed form of the algebra. Also, we work on the extended space analysis in the Lagrangian formalism. We find the primary as well as the secondary constraints. Strikingly on calculating the Dirac brackets among the phase space variables, we obtain the classical version of $κ$-Minkowski algebra.

physics.gen-ph↗

arXiv2018

Path integral action of a particle in $κ$-Minkowski spacetime

In this letter, we derive the path integral action of a particle in $κ$-Minkowski spacetime. The equation of motion for an arbitrary potential due to the $κ$-deformation of the Minkowski spacetime is then obtained. The action contains a dissipative term which owes its origin to the $κ$-Minkowski deformation parameter $a$. We take the example of the harmonic oscillator and obtain the frequency of oscillations in the path integral approach as well as operator approach upto the first order in the deformation parameter $a$. For studying this, we start with the $κ$-deformed dispersion relation which is invariant under the undeformed $κ$-Poincar$\acute{e}$ algebra and take the non-relativistic limit of the $κ$-deformed dispersion relation to find the Hamiltonian. The propagator for the free particle in the $κ$-Minkowski spacetime is also computed explicitly. In the limit, $a\rightarrow 0$, the commutative results are recovered.

physics.gen-ph↗

arXiv2017

Effect of Noncommutativity of Space-time on Zitterbewegung

In this paper, we present the results of our investigation on the modification of Zitterbewegung due to the noncommutativity of the space-time. First, we study the effect of $κ$-deformation of the space-time on Zitterbewegung. For this, we start with the $κ$-deformed Dirac theory and using $κ$-deformed Dirac equation valid upto first order in deformation parameter $a$, we find the modification in the Zitterbewegung valid upto first order in the deformation parameter $a$. In the limit $a\rightarrow 0$, we get back the commutative result. Secondly, we find the modification in the Zitterbewegung due to the Magueijo-Smolin(MS) approach of doubly special relativity(DSR) and in the limit $E_p \rightarrow \infty$, we get back the result in the commutative space-time.

physics.gen-ph↗

arXiv2014

Twisted Fermionic Oscillator Algebra in $κ$-Minkowski space-time

In this paper, we investigate the twisted algebra of the fermionic oscillators associated with Dirac field defined in $κ$-Minkowski space-time. Starting from $κ$-deformed Dirac theory, which is invariant under the undeformed $κ$-Poincare algebra, using the twisted flip operator, we derive the deformed algebra of the creation and annihilation operators corresponding to the Dirac field quanta in $κ$-Minkowski space-time. In the limit $a\rightarrow 0$, the deformed algebra reduces to the commutative result.

hep-th↗

arXiv2014

Dirac Equation in $κ$-Minkowski space-time

In this paper, we derive the Dirac equation in the $κ$-deformed Minkowski space-time. We start with $κ$-deformed Minkowski space-time and investigate the undeformed $κ$-Lorentz transformation valid to all order in the deformation parameter $a$. Using the undeformed $κ$-Lorentz algebra, we obtain the $κ$-deformed Dirac equation, valid to all order in the deformation parameter $a$. In limit $a\rightarrow$0, we get back the correct commutative result.

hep-th↗

arXiv2013

Uniformly accelerated detector in the $κ$-deformed Dirac vacuum

In this paper, we investigate how a uniformly accelerated detector responds to vacuum state of a Dirac field in the $κ$-Minkowski space-time. Starting from $κ$-deformed Dirac theory, which is invariant under $κ$-Poincare algebra, we derive $κ$-deformed Wightmann function for Dirac field, which is valid up to first order in the deformation parameter $a$. Using this, we calculate the response function of the uniformly accelerated detector, which is coupled to massless Dirac field in $κ$-spacetime. From this, we obtain the modification to Unruh effect for the $κ$-deformed Dirac field, valid up to first order in the deformation parameter.

hep-th↗

arXiv2012

Uniformly accelerating observer in $κ$-deformed space-time

In this paper, we study the effect of $κ$-deformation of the space-time on the response function of a uniformly accelerating detector coupled to a scalar field. Starting with $κ$-deformed Klein-Gordon theory, which is invariant under a $κ$-Poincaré algebra and written in commutative space-time, we derive $κ$-deformed Wightman functions, valid up to second order in the deformation parameter $a$. Using this, we show that the first non-vanishing correction to the Unruh thermal distribution is only in the second order in $a$. We also discuss various other possible sources of $a$-dependent corrections to this thermal distribution.

hep-th↗