2012/06/17 by A. D. Dolgov, Dolgov, A. D.
Physics and Astronomy · #Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #General Relativity and Quantum Cosmology (gr-qc) #High Energy Physics - Phenomenology (hep-ph) #Space Science and Extraterrestrial Life #astro-ph.CO #gr-qc #hep-ph
paper · pdf · doi:10.48550/arxiv.1206.3725
Lectures presented for particle physicists at International ITEP Winter School, Moscow, feb. 2012; 28 pages
arxiv created 2012/06/17 · openalex publication_date 2012/06/17 · arxiv updated 2012/06/19 · openalex created_date 2024/04/10 · openalex updated_date 2026/07/28
Possibility of gravitational repulsion in General Relativity is discussed and astronomical data in favor of cosmological acceleration are described. The problem of vacuum energy is emphasized and possible ways of its solution are indicated. The main attention is payed to adjustment mechanism which in principle could compensate originally huge vacuum energy down to cosmologically acceptable value and to solve the coincidence problem of a close magnitudes of the non-compensated remnants of vacuum energy and the energy density of the universe at the present time. Finally possible modifications of gravity at large scales which could induce accelerated cosmological expansion are considered.