Volume 116, Number 4, November 2016
|Number of page(s)||5|
|Section||Geophysics, Astronomy and Astrophysics|
|Published online||28 December 2016|
Loop quantum cosmology gravitational baryogenesis
1 ICREA - Passeig Luis Companys, 23, 08010 Barcelona, Spain
2 Institute of Space Sciences (IEEC-CSIC) - C. Can Magrans s/n, 08193 Barcelona, Spain
3 Tomsk State Pedagogical University - 634061 Tomsk, Russia
4 Laboratory for Theoretical Cosmology, Tomsk State University of Control Systems and Radioelectronics (TUSUR) 634050 Tomsk, Russia
Received: 21 October 2016
Accepted: 5 December 2016
Loop quantum cosmology is an appealing quantum completion of classical cosmology, which brings along various theoretical features which in many cases offer a remedy for or modify various classical cosmology aspects. In this paper we address the gravitational baryogenesis mechanism in the context of loop quantum cosmology. As we demonstrate, when loop quantum cosmology effects are taken into account in the resulting Friedmann equations for a flat Friedmann-Robertson-Walker Universe, then even for a radiation-dominated Universe, the predicted baryon-to-entropy ratio from the gravitational baryogenesis mechanism is non-zero, in contrast to the Einstein-Hilbert case, in which case the baryon-to-entropy ratio is zero. We also discuss various other cases apart from the radiation domination case, and we discuss how the baryon-to-entropy ratio is affected from the parameters of the quantum theory. In addition, we use illustrative exact solutions of loop quantum cosmology and we investigate under which circumstances the baryon-to-entropy ratio can be compatible with the observational constraints.
PACS: 98.80.Cq – Particle-theory and field-theory models of the early Universe (including cosmic pancakes, cosmic strings, chaotic phenomena, inflationary universe, etc.) / 11.25.-w – Strings and branes / 95.36.+x – Dark energy
© EPLA, 2016
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