Prespacetime Journal | May 2016 | Volume 7 | Issue 8 | pp. 1223 − 1231 1223 Nyambuya, G. G., On the Accelerated Expansion of the Universe and the Preponderance of Matter over Antimatter Exploration On the Accelerated Expansion of the Universe and the Preponderance of Matter over Antimatter G. G. Nyambuya 1 Department of Applied Physics, National University of Science & Technology, Republic of Zimbabwe Abstract When the Dirac equation is modified to include a universal all-pervading Cosmic Four Vector Field,Λμ, the modified Dirac equation violates all the seven discrete symmetries i.e.: C, P, T, CP, CT, PT and CPT. The violation of the C-symmetry seems to be capable of explaining why the Universe appears to be made up chiefly of matter. By applying this Field to Einstein’s original Field Equation, one is able to link this Field with Einstein’s cosmological constant term, Λ. Since the cosmologi- cal term is invoked to explain the supposed accelerated expansion of the Universe, the inclusion of this Field into the Dirac equation may be justified on this basis of the accelerated expansion of the Universe. Thus, the preponderance of matter over antimatter may be justified on the same basis. In conclusion, the Einstein Λ-field (hence the Λμ-field) which causes the acceleration of the the ex- pansion of the Universe may also be responsible for the observed asymmetry in matter and antimatter. Keywords: Cosmological constant, dark energy, dark matter, Dirac equation, matter, antimatter, asymmetry. “The measure of greatness in a scientific idea is the extent to which it stimulates thought and opens up new lines of research.” – Paul Adrien Maurice Dirac (1902 - 1984) 1 Introduction Each electronically charged elementary particle has a counterpart with the opposite electronic charge which is known as its antiparticle (antiparticles are also referred to as antimatter ) and just like normal particles, antiparticles do combine, forming atoms of antimatter (Amole et al. 2012, Ahmadi et al. 2016) which some call antiatoms – albeit, unlike atoms, these do not live long. Paul Dirac (1928a,b)’s brilliant theory predicted the existence of antimatter (Dirac 1930). It [Dirac’s Theory] is one of the most successful Theories of Physics. This theory, suggested that the Laws of Nature are exactly the same for matter and antimatter; so given this symmetry, the Universe must contain matter and antimatter in equal propositions everywhere and everytime – that is, across all of spacetime. Unfortunately (or maybe fortunately – as will be argued soon), when we look into our immediate vicinity, we see that this is not the case – our terrestrial habitate seems to be dominated exclusively by matter – so the question: “Why is our measurable Universe made up chiefly of matter with no significant quantities of antimatter?”, has always been hanging in-limbo since Dirac (1928a,b, 1930)’s theory was set forth. While we may wonder why the Universe is formed this way, viz matter-antimatter imbalance, we must be very thankful that the Universe is formed this way, because if it [Universe] did really have equal proportions of matter and antimatter uniformly distributed throughout all of space and time, you the reader would not be reading this because the Universe would be nothing but a hot-bath of radiation because matter and antimatter would annihilate to form radiation. Despite its great success, the search for an answer to this great cosmic mystery – why we are so lucky to have a Universe chiefly made-up of 1 Correspondence: E-mail: physicist.ggn@gmail.com