The fitting problem in a lattice Universe
- Authors: Larena, Julien
- Date: 2012
- Language: English
- Type: Text
- Identifier: vital:6780 , http://hdl.handle.net/10962/d1012405
- Description: We present a regular cubic lattice solution to Einstein field equations that is exact at second order in a small parameter. We show that this solution is kinematically equivalent to the Friedmann-Lemaitre-Robertson-Walker (FLRW) solution with the same averaged energy density. This allows us to discuss the fitting problem in that framework: are observables along the past lightcone of observers equivalent to those in the analogue FLRW model obtained by smoothing spatially the distribution of matter? We find a criterion on the compacity of the objects that must be satisfied in order for the answer to this question to be positive and given by perturbative arguments. If this criterion is not met, the answer to this question must be addressed fully non perturbatively along the past lightcone, even though the spacetime geometry can be described perturbatively. , Prepared for the Proceedings of the conference 'Relativity and Gravitation: 100 years after Einstein in Prague', Prague, 25-29th June 2012.
- Full Text:
- Date Issued: 2012
- Authors: Larena, Julien
- Date: 2012
- Language: English
- Type: Text
- Identifier: vital:6780 , http://hdl.handle.net/10962/d1012405
- Description: We present a regular cubic lattice solution to Einstein field equations that is exact at second order in a small parameter. We show that this solution is kinematically equivalent to the Friedmann-Lemaitre-Robertson-Walker (FLRW) solution with the same averaged energy density. This allows us to discuss the fitting problem in that framework: are observables along the past lightcone of observers equivalent to those in the analogue FLRW model obtained by smoothing spatially the distribution of matter? We find a criterion on the compacity of the objects that must be satisfied in order for the answer to this question to be positive and given by perturbative arguments. If this criterion is not met, the answer to this question must be addressed fully non perturbatively along the past lightcone, even though the spacetime geometry can be described perturbatively. , Prepared for the Proceedings of the conference 'Relativity and Gravitation: 100 years after Einstein in Prague', Prague, 25-29th June 2012.
- Full Text:
- Date Issued: 2012
Water and transformation in South Africa
- Authors: Palmer, Carolyn G
- Date: 2012
- Language: English
- Type: Text
- Identifier: vital:578 , http://hdl.handle.net/10962/d1009525
- Description: Water and transformation in South Africa: in special memory of Kader Asmal and Francois Junod.
- Full Text:
- Date Issued: 2012
- Authors: Palmer, Carolyn G
- Date: 2012
- Language: English
- Type: Text
- Identifier: vital:578 , http://hdl.handle.net/10962/d1009525
- Description: Water and transformation in South Africa: in special memory of Kader Asmal and Francois Junod.
- Full Text:
- Date Issued: 2012
Address to the R.U. Staff Association
- Authors: Henderson, Derek Scott
- Date: 20.11.1984
- Language: English
- Type: Text
- Identifier: vital:7471 , http://hdl.handle.net/10962/d1018348
- Full Text:
- Date Issued: 20.11.1984
- Authors: Henderson, Derek Scott
- Date: 20.11.1984
- Language: English
- Type: Text
- Identifier: vital:7471 , http://hdl.handle.net/10962/d1018348
- Full Text:
- Date Issued: 20.11.1984
Address of the Vice-Chancellor at the unveiling of the tapestry in the Rhodes University Council and Senate Chamber
- Authors: Badat, Saleem
- Date: 2011-12-01
- Language: English
- Type: Text
- Identifier: vital:7857 , http://hdl.handle.net/10962/d1016050
- Full Text:
- Date Issued: 2011-12-01
- Authors: Badat, Saleem
- Date: 2011-12-01
- Language: English
- Type: Text
- Identifier: vital:7857 , http://hdl.handle.net/10962/d1016050
- Full Text:
- Date Issued: 2011-12-01
Welcome and opening comments at the Rhodes University Colloquium on Postgraduate Supervision
- Authors: Badat, Saleem
- Date: 2011-11-21
- Language: English
- Type: Text
- Identifier: vital:7850 , http://hdl.handle.net/10962/d1016043
- Full Text:
- Date Issued: 2011-11-21
- Authors: Badat, Saleem
- Date: 2011-11-21
- Language: English
- Type: Text
- Identifier: vital:7850 , http://hdl.handle.net/10962/d1016043
- Full Text:
- Date Issued: 2011-11-21
Humanities colloquium address
- Authors: Badat, Saleem
- Date: 2011-11-11
- Language: English
- Type: Text
- Identifier: vital:7813 , http://hdl.handle.net/10962/d1016006
- Full Text:
- Date Issued: 2011-11-11
- Authors: Badat, Saleem
- Date: 2011-11-11
- Language: English
- Type: Text
- Identifier: vital:7813 , http://hdl.handle.net/10962/d1016006
- Full Text:
- Date Issued: 2011-11-11
Old Rhodian reunion - Johannesburg
- Authors: Badat, Saleem
- Date: 2011-11-04
- Language: English
- Type: Text
- Identifier: vital:7838 , http://hdl.handle.net/10962/d1016031
- Full Text:
- Date Issued: 2011-11-04
- Authors: Badat, Saleem
- Date: 2011-11-04
- Language: English
- Type: Text
- Identifier: vital:7838 , http://hdl.handle.net/10962/d1016031
- Full Text:
- Date Issued: 2011-11-04
Address to Parents Evening, Johannesburg, 2 November 2011
- Authors: Badat, Saleem
- Date: 2011-11-02
- Language: English
- Type: Text
- Identifier: vital:7848 , http://hdl.handle.net/10962/d1016041
- Full Text:
- Date Issued: 2011-11-02
- Authors: Badat, Saleem
- Date: 2011-11-02
- Language: English
- Type: Text
- Identifier: vital:7848 , http://hdl.handle.net/10962/d1016041
- Full Text:
- Date Issued: 2011-11-02
Address at the St. Mary's Diocesan School for Girls Senior School Prize Giving Ceremony
- Authors: Badat, Saleem
- Date: 2011-10-20
- Language: English
- Type: Text
- Identifier: vital:7833 , http://hdl.handle.net/10962/d1016026
- Full Text:
- Date Issued: 2011-10-20
- Authors: Badat, Saleem
- Date: 2011-10-20
- Language: English
- Type: Text
- Identifier: vital:7833 , http://hdl.handle.net/10962/d1016026
- Full Text:
- Date Issued: 2011-10-20
Environment and sustainability
- Authors: Badat, Saleem
- Date: 2011-10-15
- Language: English
- Type: Text
- Identifier: vital:7831 , http://hdl.handle.net/10962/d1016024
- Full Text:
- Date Issued: 2011-10-15
- Authors: Badat, Saleem
- Date: 2011-10-15
- Language: English
- Type: Text
- Identifier: vital:7831 , http://hdl.handle.net/10962/d1016024
- Full Text:
- Date Issued: 2011-10-15
Launch of the Cape Foundation Phase Research Programme
- Authors: Badat, Saleem
- Date: 2011-10-13
- Language: English
- Type: Text
- Identifier: vital:7795 , http://hdl.handle.net/10962/d1015988
- Full Text:
- Date Issued: 2011-10-13
- Authors: Badat, Saleem
- Date: 2011-10-13
- Language: English
- Type: Text
- Identifier: vital:7795 , http://hdl.handle.net/10962/d1015988
- Full Text:
- Date Issued: 2011-10-13
Address at the St. Andrews College Prize Giving Ceremony
- Authors: Badat, Saleem
- Date: 2011-10-12
- Language: English
- Type: Text
- Identifier: vital:7832 , http://hdl.handle.net/10962/d1016025
- Full Text:
- Date Issued: 2011-10-12
- Authors: Badat, Saleem
- Date: 2011-10-12
- Language: English
- Type: Text
- Identifier: vital:7832 , http://hdl.handle.net/10962/d1016025
- Full Text:
- Date Issued: 2011-10-12
Theses on Institutional Planning and Research at Universities
- Authors: Badat, Saleem
- Date: 2011-10-11
- Language: English
- Type: Text
- Identifier: vital:7805 , http://hdl.handle.net/10962/d1015998
- Full Text:
- Date Issued: 2011-10-11
- Authors: Badat, Saleem
- Date: 2011-10-11
- Language: English
- Type: Text
- Identifier: vital:7805 , http://hdl.handle.net/10962/d1015998
- Full Text:
- Date Issued: 2011-10-11
Higher Education in South Africa: governance, leadership and management challenges
- Authors: Badat, Saleem
- Date: 2011-09-28
- Language: English
- Type: Text
- Identifier: vital:7810 , http://hdl.handle.net/10962/d1016003
- Full Text:
- Date Issued: 2011-09-28
- Authors: Badat, Saleem
- Date: 2011-09-28
- Language: English
- Type: Text
- Identifier: vital:7810 , http://hdl.handle.net/10962/d1016003
- Full Text:
- Date Issued: 2011-09-28
Old Rhodian reunion - Cape Town
- Authors: Badat, Saleem
- Date: 2011-09-23
- Language: English
- Type: Text
- Identifier: vital:7837 , http://hdl.handle.net/10962/d1016030
- Full Text:
- Date Issued: 2011-09-23
- Authors: Badat, Saleem
- Date: 2011-09-23
- Language: English
- Type: Text
- Identifier: vital:7837 , http://hdl.handle.net/10962/d1016030
- Full Text:
- Date Issued: 2011-09-23
Political banishments in South Africa
- Authors: Badat, Saleem
- Date: 2011-09-20
- Language: English
- Type: Text
- Identifier: vital:7826 , http://hdl.handle.net/10962/d1016019
- Full Text:
- Date Issued: 2011-09-20
- Authors: Badat, Saleem
- Date: 2011-09-20
- Language: English
- Type: Text
- Identifier: vital:7826 , http://hdl.handle.net/10962/d1016019
- Full Text:
- Date Issued: 2011-09-20
From subject to citizen: how far have we come in Africa?
- Authors: Badat, Saleem
- Date: 2011-09-16
- Language: English
- Type: Text
- Identifier: vital:7798 , http://hdl.handle.net/10962/d1015991
- Full Text:
- Date Issued: 2011-09-16
- Authors: Badat, Saleem
- Date: 2011-09-16
- Language: English
- Type: Text
- Identifier: vital:7798 , http://hdl.handle.net/10962/d1015991
- Full Text:
- Date Issued: 2011-09-16
Welcome message from Dr Saleem Badat, Vice Chancellor, Rhodes University
- Authors: Badat, Saleem
- Date: 2011-09-16
- Language: English
- Type: Text
- Identifier: vital:7799 , http://hdl.handle.net/10962/d1015992
- Full Text:
- Date Issued: 2011-09-16
- Authors: Badat, Saleem
- Date: 2011-09-16
- Language: English
- Type: Text
- Identifier: vital:7799 , http://hdl.handle.net/10962/d1015992
- Full Text:
- Date Issued: 2011-09-16
Wellcome to ISER 2011 Summer School
- Authors: Badat, Saleem
- Date: 2011-09-12
- Language: English
- Type: Text
- Identifier: vital:7800 , http://hdl.handle.net/10962/d1015993
- Full Text:
- Date Issued: 2011-09-12
- Authors: Badat, Saleem
- Date: 2011-09-12
- Language: English
- Type: Text
- Identifier: vital:7800 , http://hdl.handle.net/10962/d1015993
- Full Text:
- Date Issued: 2011-09-12
Critical reflections on Rhodes, 2006-2011
- Authors: Badat, Saleem
- Date: 2011-09-09
- Language: English
- Type: Text
- Identifier: vital:7845 , http://hdl.handle.net/10962/d1016038
- Full Text:
- Date Issued: 2011-09-09
- Authors: Badat, Saleem
- Date: 2011-09-09
- Language: English
- Type: Text
- Identifier: vital:7845 , http://hdl.handle.net/10962/d1016038
- Full Text:
- Date Issued: 2011-09-09