Charles W. Hellaby
Encyclopedia
Dr Charles Hellaby is a lecturer at the University of Cape Town
, South Africa
. He is a member of the Baha'i Faith. His research interests include:
He has also worked on
University of Cape Town
The University of Cape Town is a public research university located in Cape Town in the Western Cape province of South Africa. UCT was founded in 1829 as the South African College, and is the oldest university in South Africa and the second oldest extant university in Africa.-History:The roots of...
, South Africa
South Africa
The Republic of South Africa is a country in southern Africa. Located at the southern tip of Africa, it is divided into nine provinces, with of coastline on the Atlantic and Indian oceans...
. He is a member of the Baha'i Faith. His research interests include:
- Inhomogeneous cosmologyInhomogeneous cosmologyInhomogeneous cosmology usually means the study of structure in the universe by means of exact solutions of Einstein's field equations...
. Standard cosmology assumes a smooth homogeneous universeCosmological PrincipleIn modern physical cosmology, the cosmological principle is the working assumption that observers on Earth do not occupy an unusual or privileged location within the universe as a whole, judged as observers of the physical phenomena produced by uniform and universal laws of physics...
, but the real universe is very lumpy - Inhomogeneous cosmological models - their evolution, geometry and singularitiesGravitational singularityA gravitational singularity or spacetime singularity is a location where the quantities that are used to measure the gravitational field become infinite in a way that does not depend on the coordinate system...
- Non-linear structure formation in the universe
- Extracting the geometry of the cosmos from observations
- The LemaitreGeorges LemaîtreMonsignor Georges Henri Joseph Édouard Lemaître was a Belgian priest, astronomer and professor of physics at the Catholic University of Louvain. He was the first person to propose the theory of the expansion of the Universe, widely misattributed to Edwin Hubble...
-TolmanRichard C. TolmanRichard Chace Tolman was an American mathematical physicist and physical chemist who was an authority on statistical mechanics. He also made important contributions to theoretical cosmology in the years soon after Einstein's discovery of general relativity...
cosmological model - The Szekeres cosmological model
- Junction conditions in GR
- Dense black holes
- Local inhomogeneities and the Swiss cheese model
He has also worked on
- The models of VaidyaP. C. VaidyaPrahalad Chunnilal Vaidya , was an Indian physicist and mathematician, renowned for his instrumental work in general theory of relativity...
, SchwarzschildSchwarzschild metricIn Einstein's theory of general relativity, the Schwarzschild solution describes the gravitational field outside a spherical, uncharged, non-rotating mass such as a star, planet, or black hole. It is also a good approximation to the gravitational field of a slowly rotating body like the Earth or...
-Kruskal-SzekeresKruskal-Szekeres coordinatesIn general relativity Kruskal–Szekeres coordinates, named for Martin Kruskal and George Szekeres, are a coordinate system for the Schwarzschild geometry for a black hole...
& KinnersleyWilliam Morris KinnersleyWilliam Morris Kinnersley is an American physicist who is well known for his contributions to general relativity.Kinnersley earned his Ph.D. from Caltech in 1968, under the direction of Kip Thorne... - Classical signature change
- Cosmic strings
- Gravitational collapse