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Khin Maung Maung

Publications and source records attributed to Khin Maung Maung.

8 recordsLinked to original sources
arXiv2026

Energy per base pair model from NN parameters and its applications in genomic research

Nearest-neighbor(NN) free energy parameters for DNA are well studied and reliable values of these parameters exist in the literature. They have been found to be very useful in studying DNA melting and DNA stabilization studies. In this paper, using these parameters, we have constructed a model in which one can define the energy of a base pair between any two neighboring base pairs. This model allows us to use the Boltzmann weighting factor to perform Monte Carlo sampling to probe the average energy per base pair in random sequences that must have existed at the very beginning before life existed. We then employed our model to the publicly available human Genome data. We calculated the average energy per base pair in inter-gene regions where there is no overlap of genes and also for exons and introns separately. We found that (1) these 'ancient' random sequences still persist in human genome although very scarce (2) the average energy per base pair has drifted about $22.5 \%$ of the ancient value. (3) Our model together with known mutation rates provide us with a new way to look at the 'age of life'.

q-bio.OT↗
arXiv2024

Modified Coulomb potential and the S-state wavefunction of heavy quarkonia

The combination of relativistic kinematics together with Coulomb or Yukawa potentials is a common place in atomic, nuclear and meson mass phenomenology. In meson spectroscopy, linear and Coulomb-like potentials are the most commonly used potentials and decays rates are also calculated using the value of the wavefunction at the origin. But, it has been known for sometime that the use of relativistic kinematics together with Coulomb or Coulomb-like potentials produces wavefunction singularity at the origin for S-wave \cite{DuranFriarPolyzou}. Therefore, there is a need to address this problem somehow. In this letter, we show how to overcome this problem without destroying the phenomenological success of the use of relativistic kinematics in meson mass spectroscopy. Our method can be easily implemented for similar problems in atomic, nuclear and particle phenomenology.

hep-ph↗
arXiv2007

Relativistic Multiple Scattering Theory and the Relativistic Impulse Approximation

It is shown that a relativistic multiple scattering theory for hadron-nucleus scattering can be consistently formulated in four-dimensions in the context of meson exchange. We give a multiple scattering series for the optical potential and discuss the differences between the relativistic and non-relativistic versions. We develop the relativistic multiple scattering series by separating out the one boson exchange term from the rest of the Feynman series. However this particular separation is not absolutely necessary and we discuss how to include other terms. We then show how to make a three-dimensional reduction for hadron-nucleus scattering calculations and we find that the relative energy prescription used in the elastic scattering equation should be consistent with the one used in the free two-body t-matrix involved in the optical potential. We also discuss what assumptions are involved in making a Dirac Relativistic Impulse Approximation (RIA).

nucl-th↗
arXiv2006

Electromagnetic Dissociation and Space Radiation

Relativistic nucleus-nucleus reactions occur mainly through the Strong or Electromagnetic (EM) interactions. Transport codes often neglect the latter. This work shows the importance of including EM interactions for space radiation applications.

nucl-th↗
arXiv2003

Equivalence of Minkowski and Euclidean Field Theory Solutions

We consider the correspondence between solutions of non-gravitational field theories formulated in Euclidean space-time and Minkowski space-time. Infinitely many "Euclidean" spaces can be obtained from M4 via a group of transformations in which the Wick rotation is a special case. We then discuss how the solutions of gauge field theories formulated in these "Euclidean" spaces have a one-to-one correspondence with the solutions of field theories formulated in Minkowski space-time, provided we avoid the one-point compactification into S4 = E4 U infinity.

hep-ph↗
arXiv2000

Instantaneous Bethe-Salpeter equation: utmost analytic approach

The Bethe-Salpeter formalism in the instantaneous approximation for the interaction kernel entering into the Bethe-Salpeter equation represents a reasonable framework for the description of bound states within relativistic quantum field theory. In contrast to its further simplifications (like, for instance, the so-called reduced Salpeter equation), it allows also the consideration of bound states composed of "light" constituents. Every eigenvalue equation with solutions in some linear space may be (approximately) solved by conversion into an equivalent matrix eigenvalue problem. We demonstrate that the matrices arising in these representations of the instantaneous Bethe-Salpeter equation may be found, at least for a wide class of interactions, in an entirely algebraic manner. The advantages of having the involved matrices explicitly, i.e., not "contaminated" by errors induced by numerical computations, at one's disposal are obvious: problems like, for instance, questions of the stability of eigenvalues may be analyzed more rigorously; furthermore, for small matrix sizes the eigenvalues may even be calculated analytically.

hep-ph↗