Matter sources for a null big bang

We consider the properties of stress-energy tensors compatible with a null big bang, i.e., cosmological evolution starting from a Killing horizon rather than a singularity. For Kantowski-Sachs cosmologies, it is shown that if matter satisfies the null energy condition, then (i) regular cosmological evolution can only start from a Killing horizon, (ii) matter is absent at the horizon and (iii) matter can only appear in the cosmological region due to interaction with vacuum. The latter is understood phenomenologically as a fluid whose stress tensor is insensitive to boosts in a particular direction. We also argue that matter is absent in a static region beyond the horizon. All this generalizes the observations recently obtained for a mixture of dust and a vacuum fluid. If, however, we admit the existence of phantom matter, its certain special kinds (with the parameter w ≤ -3) are consistent with a null big bang without interaction with vacuum (or without vacuum fluid at all). Then in the static region there is matter with w ≥ -1/3. Alternatively, the evolution can begin from a horizon in an infinitely remote past, leading to a scenario combining the features of a null big bang and an emergent universe. © 2008 IOP Publishing Ltd.

Bronnikov K.A. 1, 2 , Zaslavskii O.B.3
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  • 1 Center for Gravitation and Fundamental Metrology, VNIIMS, 46 Ozyornaya St., Moscow 119361, Russian Federation
  • 2 Institute of Gravitation and Cosmology, Peoples' Friendship University of Russia, 6 Miklukho-Maklaya St., Moscow 117198, Russian Federation
  • 3 Astronomical Institute of Kharkov, V N Karazin National University, Ukraine, Svoboda Square 4, Kharkov 61077, Ukraine
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Cornélissen G., Halberg F., Singh R.B., Manukyan L., Khalilov E., Muller C., Quadens O., Barreto L.M., Wang Z., Wu J., Zhao Z., Dusek J., Fiser B., Homolka P., Prikryl P., Siegelova J., Strestik J., Amory-Mazaudier C., Berger S., Hecht K., Jozsa R., Pati A.K., Singh R.K., Carandente F., Maggioni C., Laffi G., Perfetto F., Rostagno C., Tarquini R., Salti R., Fujimura A., Kumagai Y., Mitsutake G., Otsuka K., Watanabe Y., Weydahl A., Chirinos J., Blank M., Denisova O., Breus T.K., Blagonravov M.B., Chibisov S.M., Masalov A., Malkova I., Mitish M., Syutkina E.V., Turti T., Zaslavskaya R.M., Gvozdjakova A., Zeman M., Revilla M., Ulmer W., Valenzi V., Bogdanov V., Gorgo Y., Delyukov A., Wilson D., Simpson H., Hillman D., Sothern R.B., Bingham C., Hawkins D., Holte J., Johnson D., Adams C., Beaty L., Nolley E., Engebretson M., Bakken E., Holley D., Sundaram S., De Prins J., Delcourt A., Deruyck C., Toussaint G., De La Peña S.S., Mikulecky Sr.M.
World Heart Journal. Vol. 1. 2008. P. 15-21