Welcome to Guest !
 
       IUP Publications
              (Since 1994)
Home About IUP Journals Books Archives Publication Ethics
     
  Subscriber Services   |   Feedback   |   Subscription Form
 
 
Login:
- - - - - - - - - - - - - - - - - -- - - - - - - - - - - -
-
   
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 
The IUP Journal of Physics

April-July '09
Focus

Geological studies estimate earth to be around 4.5 billion years old. Anthropological studies reveal that the anatomical evolution of human beings was completed some 50,000 years ago. There is however no study that gives us an estimate of when the first seed of man's quest to know about the universe in which he is placed was sown.

Articles
   
Price
(INR)
Buy
Towards the Reinstatement of Absolute Space: Some Possible Cosmological Implications
Relativistic Invariance
Torsion and Axial Current
On Completion of Einstein's Unified Field Theory
Quantum Corrections in N = 1 Supersymmetric Theories: Is Everything Clear?
Dark Matter from Stable Charged Particles?
State, Statistics and Quantization in Einstein's 1907 Paper, `Planck's Theory of Radiation and the Theory of Specific Heat of Solids'
Select/Remove All    

Towards the Reinstatement of Absolute Space: Some Possible Cosmological Implications

-- Héctor A Múnera

This paper reviews empirical evidences from several optical experiments on the earth showing the possiblility to detect the motion of the Earth. Four different experiments with different technical means, and from widely separated places in time and space, point towards solar motion in a plane with right ascension of 75º. However, there is no agreement on the declination, which seems to be large. This evidence contradicts the widely accepted heuristic principle that the motion of the Earth cannot be detected by terrestrial experiments, and opens the door for a reinstatement of the currently forbidden concept of absolute space S. A closed finite Newtonian universe has interesting cosmological implications, as compatibility with the variation of speed with distance (without expansion), and the appearance of new acceleration term of the same order of magnitude as the Modified Newtonian Dynamics (MOND) cut-off, thus offering an alternative explanation to the dark matter and MOND hypotheses.

Article Price : Rs.50

The Identical Physical and Geometrical Sense of Transformations of Galileo and Lorentz

-- Nikolai V Mitskievich

The idea of unification of space and time was first proposed by d'Alembert in 1754, while the Galilean transformation was already given by Newton. As a synthesis of these ideas, the author elementarily deduces the standard form of Lorentz transformation using the complementarity of coordinates and their axes under coordinates' transformations in general. The Galilean transformation in this sense is equivalent to the Lorentz one, only being its non-orthonormalized version.

Electromagnetic Field: Its Existence and Distinctions in Spacetimes of Different Dimensionalities

-- Nikolai V Mitskievich

It is shown that the Maxwellian-type electromagnetic field possesses a vector potential only in the D = 4 spacetime. In other numbers of dimensions, it either has an ( r = D/2-1) form potential, or when D is an odd number, does not exist at all. When it exists, it belongs to intrinsically relativistic fields, which do not admit any non-relativistic approximation. Other r-form fields are also discussed, including those which model perfect fluids in the field-theoretical language.

Inevitability of Relativistic Generalization of the Inertial Versus Gravitational Mass Equivalence Principle

-- Nikolai V Mitskievich

The Newtonian approximation for the gravitational field equation does not necessarily involve admission of non-relativistic properties of the source terms in Einstein's equations. It is sufficient to merely consider the weak-field condition for a gravitational field. When a source has electromagnetic nature, one simply cannot ignore its intrinsically relativistic properties, since any non-relativistic approximation, which would describe electromagnetic stress-energy-momentum complex adequately, cannot be invented. But the test particle on which gravitational field of the source is acting, should be treated as non-relativistic.

Relativistic Invariance

-- W W Zachary and Tepper L Gill

A modification of the conventional Maxwell theory of electrodynamics is constructed by replacing the observer-time by the proper-time of the source. This formulation is mathematically, but not physically, equivalent to the conventional formulation. The change induces a new symmetry group that is distinct from, but closely related to, the Lorentz group and fixes the clock of the source for all observers. The new wave equation contains an additional dissipative term that arises instantaneously with acceleration. This shows that the origin of radiation reaction is not the action of a charge on itself, but arises from inertial resistance to changes in motion. This dissipative term is equivalent to an effective mass, so that classical radiation has both a massless and a massive part. Hence, at the local level, the theory is one of particles and fields, but there exists no self-energy divergence (nor any of the other problems with which the conventional theory is afflicted). It is also shown that, for any closed system of particles, there exists, for each observer, a global inertial frame and a unique invariant global proper-time from which the system may be observed. This global clock is intrinsically related to the proper clocks of the individual particles and provides a unique definition of simultaneity for all events associated with the system. We suggest that this global clock is the historical clock, discussed by Horwitz and Piron (1973) and Fanchi (1993a and 1993b). The theory is of the action-at-a-distance type and the absorption hypothesis of Wheeler and Feynman follows from global conservation of energy. The present theory is analogous to theirs, but we do not use advanced fields.

Article Price : Rs.50

Torsion and Axial Current

-- Prasanta Mahato

The role of torsion and a scalar field in gravitation, especially, in the presence of a Dirac field in the background of a particular class of the Riemann-Cartan geometry is considered here. Recently, a Lagrangian density with Lagrange multipliers has been proposed, which has been obtained by picking some particular terms from the SO (4, 1) Pontryagin density, where the scalar field causes the de Sitter connection to have the proper dimension of a gauge field. In this formalism, conserved axial vector matter current can be constructed, irrespective of any gauge choice, in any space-time manifold having arbitrary background geometry. This current is not a Noether current.

Article Price : Rs.50

The Symmetries C , P and T of the Dirac Field and Their Non-Relativistic Limit

-- Dalia Cervantes C

Initially, we found a bundle,which contains the matrix representation of the transformations C, P, T and for the Dirac field and we studied their action on the elements of the Dirac algebra D16. We give a geometrical description of the action of the parity on non-relativistic 1/2 spin Pauli spinors in terms of the bundle theory. The relevant bundle, is a non-trivial extension of the universal covering group . From the direct product of O(3) by Z2 naturally induced by the structure of Galilean group, we identify, in its double cover, the time reversal operator acting on spinors, and its product with . At the end, we study the non-relativistic limit of the charge conjugation transformation C in the context of the Dirac equation coupled to an electromagnetic field. The existence of these limits is supported by the consistence between the `large' and `small' components for the spinor and the conjugate spinor respectively and by an argument based in the quantum field theory. Finally, if one complexifies the Lorentz group, and therefore, the Galilean spacetime, the explicit form of the matrix for allows C to interpret it, in this context, as the complex conjugation of the spatial coordinates . This result is natural in a fiber bundle description.

On Completion of Einstein's Unified Field Theory

-- Mendel Sachs

The author's research program over the past 50 years has dealt with a generalization of the expression of the theory of general relativity, within its own logical base, and its application to problems of cosmology, astrophysics and particle physics. One part of this program was to show that a generalized version of the theory yields the formal structure of quantum mechanics as a linear approximation for a generally covariant field theory of the inertia of matter (Sachs, 1986). The second part of this program was to demonstrate that the generalized version of general relativity yields a unified field theory of gravitation and electromagnetism, in terms of a single field (Sachs, 1982). This paper is devoted to the latter, demonstrating a unified field theory within the confines of the logical basis of the theory of general relativity.

Article Price : Rs.50

Quantum Corrections in N = 1 Supersymmetric Theories: Is Everything Clear?

-- K V Stepanyantz

This paper discusses some interesting features of quantum corrections in N = 1 supersymmetric theories, which have been discovered analyzing calculations made with the higher covariant derivative regularization. In particular, the author argues that all integrals, defining the Gell-Mann-Low function in supersymmetric theories, are integrals of total derivatives. As a consequence, possibly there are some interesting identities, which restrict Green functions and do not follow from usual Slavnov-Taylor identities.

Article Price : Rs.50

Mirror Dark Matter Discovered?

-- Z K Silagadze

Recent astrophysical data indicates that dark matter shows a controversial behavior in galaxy cluster collisions. In case of the notorious bullet cluster, dark matter component of the cluster behaves like a collisionless system. However, its behavior in the Abell 520 cluster indicates a significant self-interaction cross-section. It is hard for the Weakly Interacting Massive Particles (WIMP) based dark matter models to reconcile such a diverse behavior. Mirror dark matter models, on the contrary, are more flexible and for them diverse behavior of the dark matter is a natural expectation.

Dark Matter from Stable Charged Particles?

-- Maxim Yu Khlopov

Particle physics candidates for cosmological dark matter are usually considered as neutral and weakly interacting. However, stable charged leptons and quarks can also exist and, hidden in elusive atoms, play the role of dark matter. The necessary condition for such scenario is the absence of stable particles with charge -1 and effective mechanism for suppression of free positively charged heavy species. These conditions are realized in several recently developed scenarios. In a scenario based on the walking technicolor model, excess of stable particles with charge -2 and the corresponding dark matter density is naturally related with the value and sign of cosmological baryon asymmetry. The excessive charged particles are bound with primordial helium in techni-O-helium `atoms', maintaining specific nuclear-interacting form of dark matter. Some properties of techni-O-helium universe are discussed.

Article Price : Rs.50

State, Statistics and Quantization in Einstein's 1907 Paper, `Planck's Theory of Radiation and the Theory of Specific Heat of Solids'

-- Peter Enders

Einstein's paper, "Planck's Theory of Radiation and the Theory of Specific Heat of Solids" (1907) is famous for that it marks the beginning of the quantum theory of solids. In contrast to classical statistics, a simple quantum oscillator model of lattice vibrations yields a decreasing specific heat with decreasing temperature, in agreement with the then few experimental findings. This brought him to the attention of Nernst, who became one of the driving forces to attract Einstein to Berlin. Less known is, however, that this paper contains two other fundamental insights. First, it shows that the differences between classical and quantum statistical distribution functions are related to the energetic spectra of systems, rather than to the (in)distinguishability of particles. Second, the problem of quantization is (indirectly) formulated as the problem to select the set of quantum states out of the set of classical states. Such an approach allows to satisfy the requirements of any quantization posed by SchrÖdinger as early as 1926. Nevertheless, this paper has found much less attention than most other pioneering contributions by Einstein. It is hoped that the revival of these thoughts will help to overcome some of the still present difficulties in the interpretation of quantum mechanics as well as to provide a dynamical solution to Gibbs' paradox within classical statistical mechanics.

Article Price : Rs.50

Search
 

  www
  IUP

Search
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

Click here to upload your Article

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Automated Teller Machines (ATMs): The Changing Face of Banking in India

Bank Management
Information and communication technology has changed the way in which banks provide services to its customers. These days the customers are able to perform their routine banking transactions without even entering the bank premises. ATM is one such development in recent years, which provides remote banking services all over the world, including India. This paper analyzes the development of this self-service banking in India based on the secondary data.

The Information and Communication Technology (ICT) is playing a very important role in the progress and advancement in almost all walks of life. The deregulated environment has provided an opportunity to restructure the means and methods of delivery of services in many areas, including the banking sector. The ICT has been a focused issue in the past two decades in Indian banking. In fact, ICTs are enabling the banks to change the way in which they are functioning. Improved customer service has become very important for the very survival and growth of banking sector in the reforms era. The technological advancements, deregulations, and intense competition due to the entry of private sector and foreign banks have altered the face of banking from one of mere intermediation to one of provider of quick, efficient and customer-friendly services. With the introduction and adoption of ICT in the banking sector, the customers are fast moving away from the traditional branch banking system to the convenient and comfort of virtual banking. The most important virtual banking services are phone banking, mobile banking, Internet banking and ATM banking. These electronic channels have enhanced the delivery of banking services accurately and efficiently to the customers. The ATMs are an important part of a bank’s alternative channel to reach the customers, to showcase products and services and to create brand awareness. This is reflected in the increase in the number of ATMs all over the world. ATM is one of the most widely used remote banking services all over the world, including India. This paper analyzes the growth of ATMs of different bank groups in India.
International Scenario

If ATMs are largely available over geographically dispersed areas, the benefit from using an ATM will increase as customers will be able to access their bank accounts from any geographic location. This would imply that the value of an ATM network increases with the number of available ATM locations, and the value of a bank network to a customer will be determined in part by the final network size of the banking system. The statistical information on the growth of branches and ATM network in select countries.

Indian Scenario

The financial services industry in India has witnessed a phenomenal growth, diversification and specialization since the initiation of financial sector reforms in 1991. Greater customer orientation is the only way to retain customer loyalty and withstand competition in the liberalized world. In a market-driven strategy of development, customer preference is of paramount importance in any economy. Gone are the days when customers used to come to the doorsteps of banks. Now the banks are required to chase the customers; only those banks which are customercentric and extremely focused on the needs of their clients can succeed in their business today.

more...

 
View Previous Issues
Physics