Mar
23

On the theory of relativistic collapse and relativistic explosion.

1. Collapse without horizon and formation of frozars.

Zahid Zakir [1]

Abstract

        In general relativity (GR) the surface of a spherical object as an extended body is defined on hypersurfaces of simultaneity t=const and the proper time on the object’s surface at any moment is strongly related to the finite world time moment t (astronomical epoch). At any finite t this proper time moment always is less than its value at which the surface would cross the gravitational radius in the Newtonian theory. It is shown that in GR, as the surface closely approaches the gravitational radius, the proper times rapidly freeze (in terms of t) firstly at the center, where the time delay is maximal, then at higher layers, and that the surface freezes after all layers beyond the gravitational radius. The freezing of all processes in entire volume means the practically stopping of the collapse also. Thus, in GR there is a universal factor preventing the collapse – a strong gravitational dilation of the proper times, a fundamental physical phenomenon with which GR mainly differs from the Newtonian theory. For this reason in GR the horizons and singularities, as the Newtonian theory artifacts, do not arise and the black holes are forbidden. The collapse in GR leads to the formation of the frozars (frozen stars) the surface and all layers in entire volume of which are frozen. The worldlines of the particles in the star are timelike and almost parallel to the taxis and between each other. The formation of the frozars is shown for the standard idealized models of the collapse – a thin dust shell, a dust ball, a star of constant density and a star with ultrarelativistic matter. The astrophysical consequences of the theory of collapsed stars as frozars of GR are shortly discussed.

PACS: 04.20.Dg;  04.70.-s;  97.60.-s,  98.54.-h

Key words: relativistic stars, collapse, frozars, black holes, horizon, singularity, time dilation

Vol. 7, No 1, p. 1 – 13, v1,  23 March 2012

Online: TPAC: 4100-024 v2,  28 September 2012; DOI: 10.9751/TPAC.4100-024


Sep
14

Rotatory quantization of charge-conjugation symmetric systems.

3. Relativistic fields.

Zahid Zakir [1]

Abstract    

Quantum theory of complex fields with rotational modes based on a harmonic rotator model is constructed. For purely rotational modes the energy spectrum is equidistant, observables are automatically normal-ordered and there is no zero-point vacuum energy and zero-point charge. Frequencies of quanta are angular speeds of rotating field vectors (in real or field spaces). States of two signs of the helicity (particle-antiparticle) are related through the crossing symmetry. The well-known examples are photon field with circular polarization and complex fields. The spin and isospins of particles appear as related to their frequencies, representing angular momenta of rotations of field vectors with these frequencies. It is shown that the standard covariant perturbation theory is constructed in fact for description on the basis of harmonic rotators, where the recipe of transition from oscillatory to the rotatory representations of modes earlier it has been found empirically as normal-ordering of operators. The vacuum energy vanishes for free Hamiltonians and C-symmetric interactions.

PACS: 03.70. +k, 11.30.Er

Key words: quantization of fields, charge conjugation, parity, vacuum energy

Vol. 6, No 3, p. 48 – 63, v1,  14 December 2011

Online: TPAC: 4000-023 v2,  28 September 2012; DOI: 10.9751/TPAC.4000-023


[1] Centre for Theoretical Physics and Astrophyics, Tashkent, Uzbekistan

      zahidzakir@theor-phys.org

Sep
05

Rotatory quantization of charge-conjugation symmetric systems.

1. Harmonic oscillators

       Zahid Zakir [1]

Abstract    

In a system of a particle and antiparticle in the harmonic potential, represented as an oscillator with a complex generalized coordinate, there is a global U(1) symmetry and the charge conjugation (C) symmetry. It is shown that two pairs of ladder operators, introduced at the frequency decomposition of canonical variables, are not mutually charge-conjugate and that, therefore, their standard interpretation as operators of the charge-conjugate quanta breaks C-symmetry. Operator identities between bilinear products of the ladder operators are discovered, allowing expressing observables through charge-conjugate operators and it is correct to take into account C-symmetry. It is shown that these identities are maintained and at insert of the C-symmetric interactions. In a Lagrangian unsymmetrized and symmetrized orderings of complex conjugate operators of a momentum lead to different charge operators and are not equivalent at interaction with the gauge field. It is shown that due to C-symmetry conditions a zero-point charge does not arise in both orderings and in the first case a zero-point energy disappears also. The contribution of interaction with the gauge field and anharmonic potentials in higher orders of perturbation theory is considered. The same system also can be presented as a particle with positive and negative frequencies and, if to consider that a sign of mass of the particle coincides with a sign of its frequency, then the norm of negative frequency states remains positive.

PACS: 03.65.Ge, 11.30.Er, 1130.Ly, 11.90. +t

Key words: Hamiltonian dynamics, discrete symmetries, quantization

Vol. 6, No 2, p. 14 – 30, v1, 5 September 2011

Online: TPAC: 3900-021 v2, 28 September 2012; DOI: 10.9751/TPAC.3900-021

Download pdf 426 kb


[1] Centre for Theoretical Physics and Astrophyics, Tashkent, Uzbekistan

      zahidzakir@theor-phys.org

Sep
05

Rotatory quantization of charge-conjugation symmetric systems.

2. Harmonic and magneto-harmonic rotators

Zahid Zakir [1]

Abstract

     For soft rotators the lack of a radial component of velocity is a defining property and it allows to simplify quantization of harmonic and magneto-harmonic rotators. Operators of observables of soft rotators are normal ordered due to symmetries of the system, energy spectrum is linear under frequency and equidistant, and in the ground state there is no zero-point energy from rotational modes. It coincides with a generalization of the uncertainty relations for systems with non-hermitian canonical variables where the restrictions on fluctuations depend on state’s charge. Applications of the new formalism to quantization of waves at collective rotations of one-dimensional chain of harmonic rotators allows to model fields with charge-conjugation and gauge symmetries. For the rotating modes there is a crossing symmetry between states with opposite rotation directions, and arising of negative-frequency modes are positive-frequency states of antiquanta with replaced initial and final states. The commutators and causal correlators (propagators) of generalized coordinates of the harmonic rotator are derived.

PACS: 03.65.Ge, 11.30.Er, 1130.Ly, 11.90. + t

Key words: discrete symmetries, rotations, charge-conjugation symmetry, Landau levels, chain of rotators, propagators

Vol. 6, No 2, p. 31 – 47, v1,      5 September 2011

Online: TPAC: 3900-022 v2,  28 September 2012; DOI: 10.9751/TPAC.3900-022


[1] Centre for Theoretical Physics and Astrophyics, Tashkent, Uzbekistan

      zahidzakir@theor-phys.org

May
28

Models of soft rotators and the theory of a harmonic rotator

Zahid Zakir [1]

Abstract

    The states of a planar oscillator are separated to a vibrational mode, containing a zero-point energy, and a rotational mode without the zero-point energy, but having a conserved angular momentum. On the basis of the analysis of properties of models of rigid and semirigid rotators, the theory of soft rotators is formulated where the harmonic attractive force is balanced only by the centrifugal force. As examples a Coulomb rotator (the Bohr model) and a magneto-harmonic rotator (the Fock-Landau levels) are considered. Disappearance of the radial speed in the model of a magneto-harmonic rotator is taken as a defining property of a pure rotational motion in the harmonic potential. After the exception of energies of the magnetic and spin decompositions, specific to magnetic fields, one turns to a simple and general model of a plane harmonic rotator (circular oscillator without radial speed) where kinetic energy is reduced to the purely rotational energy. Energy levels of the harmonic rotator have the same frequency and are twice degenerate, the energy spectrum is equidistant. In the ground state there is no zero-point energy from rotational modes, and the zero-point energy of vibrational modes can be compensated by spin effects or symmetries of the system. In this case the operators of observables vanish the ground state, i.e. are “strongly” normally ordered. In a chain of harmonic rotators collective rotations around a common axis lead to transverse waves, at quantization of which there appear quasi-particles and holes carrying an angular momentum. In the chain SU (2) appears as a group of symmetry of a rotator.

PACS: 03.65.Ge, 11.30.Er, 1130.Ly, 11.90. + t

Key words: quantization, zero-point energy, vibrations, rotations, discrete symmetries

Vol. 6, No 1, p. 1 – 13, v1,        28 May 2011

Online: TPAC: 3800-020 v2, 18 September 2012; DOI: 10.9751/TPAC.3800-020

Download  pdf 320 kb


[1] Centre for Theoretical Physics and Astrophyics, Tashkent, Uzbekistan

      zahidzakir@theor-phys.org

Nov
09

Four-index equations for gravitation and the gravitational energy-momentum tensor [1]

      Zahid Zakir [2]

Abstract

    A new treatment of the gravitational energy on the basis of 4-index gravitational equations is reviewed. The gravitational energy for the Schwarzschild field is considered.

PACS: 04.20.Cv, 04.20.Fy, 11.10.-z

Key words: gravitational energy, curvature tensor, vacuum energy

Vol. 5, No 2,  p. 22 – 25, v1,   9 November 2010

Online: TPAC: 3600-019 v2,  28 September 2012; DOI: 10.9751/TPAC.3600-019

[1] The preprint of the paper has been presented in 1999 (revised 2003): Zakir Z. arXiv:gr-qc/9906039

[2] Centre for Theoretical Physics and Astrophyics, Tashkent, Uzbekistan

      zahidzakir@theor-phys.org


Nov
09

Four-index energy-momentum tensors for gravitation and matter [1]

      Zahid Zakir [2]

Abstract

   The 4-index energy-momentum tensors for gravitation and matter are analyzed on the basis of new equations for the gravitational field with the Riemann tensor. Some properties of such defined gravitational energy are discussed.

PACS: 04.20.Cv, 04.20.Fy, 11.10.-z

Key words: gravitational energy, curvature tensor, vacuum energy

Vol. 5, No 2, p. 18 – 21, v1,   9 November 2010

Online: TPAC: 3600-018 v2,  28 September 2012; DOI: 10.9751/TPAC.3600-018


[1] The preprint of the paper has been presented in 1999 (revised 2003): Zakir Z. arXiv:gr-qc/9905036

[2] Centre for Theoretical Physics and Astrophyics, Tashkent, Uzbekistan

      zahidzakir@theor-phys.org


Nov
09

New equations for gravitation with the Riemann tensor and 4-index energy-momentum tensors for gravitation and matter [1]

      Zahid Zakir [2]

Abstract

    A generalized version of the Einstein equations in the 4-index form, containing the Riemann curvature tensor linearly, is derived. It is shown, that the gravitational energy-momentum density outside a source is represented across the Weyl tensor vanishing at the 2-index contraction. The 4-index energy-momentum density tensor for matter also is constructed.

PACS: 04.20.Cv, 04.20.Fy, 11.10.-z

Key words: gravitational energy, curvature tensor, vacuum energy

Vol. 5, No 2, p. 14 – 17, v1,   9 November 2010

Online: TPAC: 3600-017 v2, 28 September 2012; DOI:  10.9751/TPAC.3600-017


[1] The preprint of the paper has been presented in 1999 (revised 2003): Zakir Z. arXiv:gr-qc/9905009

[2] Centre for Theoretical Physics and Astrophyics, Tashkent, Uzbekistan

      zahidzakir@theor-phys.org


May
20

Are strings thermostrings? [1]

      Zahid Zakir [2]

Abstract

      In the method of thermostring quantization the time evolution of point particles at finite temperature kT is described in a geometric manner. The temperature paths of particles are represented as closed (thermo)strings, which are swept surfaces in a space-time-temperature manifold. The method makes it possible a new physical interpretation of superstrings IIA and heterotic strings as point particles in a thermal bath with Planck temperature.

PACS: 11.10.Wx, 11.10.Kk, 11.25.-w, 11.25.Uw, 11.25.Wx

Key words: quantization, finite temperature, extra dimensions, strings, branes

Vol. 5, No 1,  p. 8 – 13, v1,  20 May 2010

Online: TPAC: 3400-016 v2,  28 September 2012; DOI: 10.9751/TPAC.3400-016

Download  pdf 182 kb


[1] The preprint of the paper has been presented in 1998 (revised 2003): Zakir Z. arXiv:hep-th/9809247

[2] Centre for Theoretical Physics and Astrophyics, Tashkent, Uzbekistan

      zahidzakir@theor-phys.org


May
20

Thermostring quantization.

An interpretation of strings as particles at finite temperatures [1]

      Zahid Zakir [2]

Abstract

     In a space-temperature configurational manifold an instantaneous temperature path of a point particle can be represented as a string of length L=1/kT (thermostring). The thermostring swepts a surface in the space-time-temperature manifold at its temporal evolution. The thermostring is closed, its points can be rearranged and the charge is distributed along the length. Some predictions of this method for statistical mechanics and string theories are discussed.

PACS: 11.10.Wx, 11.10.Kk, 11.25.-w, 11.25.Uw, 11.25.Wx

Key words: quantization, finite temperature, extra dimensions, strings, branes

Vol. 5, No 1,  p. 1 – 7, v1,  20 May 2010

Online: TPAC: 3400-015 v2,  28 September 2012; DOI: 10.9751/TPAC.3400-015


[1] The preprint of the paper has been presented in 1998 (revised 2003): Zakir Z. arXiv:hep-th/9809170

[2] Centre for Theoretical Physics and Astrophyics, Tashkent, Uzbekistan

      zahidzakir@theor-phys.org