Author pages are created from data sourced from our academic publisher partnerships and public sources.

Publications Influence

Share This Author

On the covariance of teleparallel gravity theories

- A. Golovnev, T. Koivisto, M. Sandstad
- Physics
- 23 January 2017

The basics of teleparallel gravity and its extensions are reviewed with particular emphasis on the problem of the Lorentz-breaking choice of connection in pure-tetrad versions of the theories. Vari… Expand

95 7- PDF

A note on covariant conservation of energy–momentum in modified gravities

- T. Koivisto
- Physics
- 25 May 2005

An explicit proof of the vanishing of the covariant divergence of the energy–momentum tensor in modified theories of gravity is presented. The gravitational action is written in arbitrary dimensions… Expand

142 3- PDF

Matter power spectrum in f(R) gravity

- T. Koivisto
- Physics
- 1 February 2006

Modified gravity can be considered as an alternative to dark energy. In a generalized theory of gravity, the Universe may accelerate while containing only baryonic and dark matter. We study, in… Expand

100 3- PDF

An integrable geometrical foundation of gravity

- T. Koivisto
- Physics
- 2 February 2018

In a talk at the conference Geometrical Foundations of Gravity at Tartu, 2017, it was suggested that the affine spacetime connection could be associated with purely fictitious forces. This leads to… Expand

23 3- PDF

An Analog Viterbi Decoder Array for DS-UWB Receiver

- J. Maunu, T. Koivisto, M. Laiho, A. Paasio
- Computer Science
- IEEE International Conference on Ultra-Wideband
- 1 September 2006

TLDR

8 2

Generalized quadratic curvature, non-local infrared modifications of gravity and Newtonian potentials

- Aindri'u Conroy, T. Koivisto, A. Mazumdar, A. Teimouri
- Physics
- 19 June 2014

Metric theories of gravity are studied, beginning with a general action that is quadratic in curvature and allows infinite inverse powers of the d'Alembertian operator, resulting in infrared… Expand

73 2- PDF

Cosmological perturbations in the Palatini formulation of modified gravity

- T. Koivisto, H. Kurki-Suonio
- Physics
- 15 September 2005

Cosmology in extended theories of gravity is considered assuming the Palatini variational principle, for which the metric and connection are independent variables. The field equations are derived to… Expand

120 1- PDF

Dynamics of nonlocal cosmology

- T. Koivisto
- Physics
- 24 March 2008

Nonlocal quantum corrections to gravity have been recently proposed as a possible solution to the cosmological fine-tuning problems. We study the dynamics of a class of nonlocal actions defined by… Expand

126 1- PDF

An Analog DS-UWB receiver

- T. Koivisto, J. Maunu, E. Tiiliharju
- Engineering
- IEEE International Conference on Ultra-Wideband
- 12 November 2007

In this paper, we propose a direct-conversion direct-sequence inductorless CMOS receiver for pulse-based UWB communications using a high-speed analog Viterbi decoder. The circuit system architecture… Expand

3 1

Mixed-signal Viterbi decoder for a MB-OFDM receiver

- J. Maunu, M. Laiho, T. Koivisto, K. Virtanen, M. Pankaala, A. Paasio
- Computer Science
- IEEE International Conference on Ultra-Wideband
- 17 October 2008

TLDR

5 1

...

1

2

3

...