Narlikar, J. V.2012-04-032012-04-031987-04-12http://hdl.handle.net/11007/1688This review highlights some of the cosmological theories proposed as alternatives to the standard hot big bang model. Specific ideas discussed here are the matter-antimatter symmetric cosmologies, the empirical two-component model, the G-varying cosmologies, the chronometric cosmology and a simplified quantum cosmology. It is argued that many alternative cosmologies have contributed useful concepts and offered observational tests that have enriched the field of cosmology as a science.enAntimatterGravitation theoryQuantum theorySpace-time functionsSteady stateCosmologyArticle