Abstract
The Standard Cosmological model is extended to include particles created by Universe expansion. Accordingly, the density ρ and pressure p are modified by the adjoint of terms in the form \(\alpha (t)\dot R(t)/R(t)\), \(\beta (t)\dot R(t)/R(t)\). Such expressions are based on results, previously obtained, relative to field quantization in curved space-time for spin 0 , 1/2 , 1 . The model is discussed in general and for special physical configurations. The case p = wρ is solved in the flat space-time case, and is discussed in some special asymptotic cases, leaving, however, the problem of determining α(t), β(t) open. The matter- and radiation-dominated models, analogous to those of the Standard Cosmology, are studied by choosing α(t), β(t) to be constant in time. The two models are integrated in the flat space-time case and both allow a numerical evaluation of the parameter Ω 0c relative to particle creation. Such value lies into the expected range. The results support the expectation that particle production plays an active role in the formulation of the cosmological model. Its importance should, however, be tested also in open and closed models and within a discussion including all kinds of energy contributions in the cosmological Einstein equation.
Similar content being viewed by others
References
L. Parker, Phys. Rev. Lett. 21, 562 (1968).
L. Parker, Phys. Rev. 183, 1057 (1969).
L. Parker, Phys. Rev. 3, 346 (1971).
S.A. Fulling, Phys. Rev. D 7, 2850 (1973).
S.A. Fulling, Aspects of Quantum Field Theory in curved space-time (Cambridge University Press, Cambridge, 1989).
N.D. Birrell, P.C.W. Davies, Quantum fields in curved space-time (Cambridge University Press, Cambridge, 1982).
L. Parker, D. Toms, Quantum Field Theory in Curved Space-time (Cambridge University Press, Cambridge, 2009).
A. Zecca, Adv. Stud. Theor. Phys. 3, 493 (2009).
A. Zecca, Adv. Stud. Theor. Phys. 4, 797 (2010).
A. Zecca, Adv. Stud. Theor. Phys. 4, 951 (2010).
A. Zecca, Separation and solution of spin 1 field equation and particle production in Lemaitre-Tolman-Bondi cosmologies, in Aspects of Todays Cosmology, edited by A. Alfonso-Faus (InTech, 2011) ISBN 978-953-307-626-3.
S. Moradi, Int. J. Theor. Phys. 48, 969 (2009).
I. Prigogine, J. Geheniau, Proc. Natl. Acad. Sci. USA 83, 6245 (1986).
I. Prigogine, J. Geheniau, E. Gunzig, P. Nardone, Gen. Relativ. Gravit. 21, 767 (1989).
I. Prigogine, Int. J. Theor. Phys. 28, 927 (1989).
J.A.S. Lima, F.E. Silva, R.C. Santos, Class. Quantum Grav. 25, 205006 (2008).
S. Debnath, A.K. Sanyal, Class. Quantum Grav. 28, 145015 (2011).
L. Parker, J.Z. Simon, Phys. Rev. D 47, 1339 (1993).
E.E. Flanagan, M. Wald, Phys. Rev. D 54, 6293 (1996).
V.F. Mukhanov, S. Winitzki, Quantum Effects in Gravity (Cambridge University Press, Cambridge, 2009).
A. Zecca, Adv. Stud. Theor. Phys. 4, 191 (2010).
A. Zecca, Adv. Stud. Theor. Phys. 5, 305 (2011).
S. Weinberg, Cosmology (Oxford University Press, New York, 2008).
S. Weinberg, Gravitation and Cosmology (John Wiley & Sons, New York, 1972).
E.W. Kolb, M.S. Turner, The Early Universe (Addison-Wesley, New York, 1988).
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Zecca, A. Standard Cosmology extended to include particle creation originated from Universe expansion. Eur. Phys. J. Plus 127, 18 (2012). https://doi.org/10.1140/epjp/i2012-12018-x
Received:
Revised:
Accepted:
Published:
DOI: https://doi.org/10.1140/epjp/i2012-12018-x