Corpus ID: 243938808

Unimodular Cosmological models

@inproceedings{lvarez2021UnimodularCM,
  title={Unimodular Cosmological models},
  author={Enrique {\'A}lvarez and Jes{\'u}s G Anero},
  year={2021}
}
It is claimed that in the unimodular gravity framework the observational fact of exponential expansion of the universe cannot be taken as evidence for the presence for a cosmological constant or similar quintessence. ar X iv :2 10 9. 08 07 7v 2 [ gr -q c] 1 0 N ov 2 02 1 

References

SHOWING 1-10 OF 14 REFERENCES
Unimodular gravity redux
It is well known that the problem of the cosmological constant appears in a new light in unimodular gravity. In particular, the zero-momentum piece of the potential does not automatically produce aExpand
Unimodular cosmology and the weight of energy
Some models are presented in which the strength of the gravitational coupling of the potential energy relative to the same coupling for the kinetic energy is, in a precise sense, adjustable. TheExpand
Relativistic Cosmology. I
The paper presents some general relations obtaining in relativistic cosmology. It appears from these that a simple change over to anisotropy without the introduction of spin does not solve any of theExpand
The exchange of massless spin-two particles
The theory of gravity is considered from the little group viewpoint. This leads to a theory with a constraint, which is equivalent to general relativity with an arbitrary cosmological term. With thisExpand
Can one tell Einstein's unimodular theory from Einstein's general relativity?
The so called unimodular theory of gravitation is compared with general relativity in the quadratic (Fierz-Pauli) regime, using a quite broad framework, and it is argued that quantum effects allow inExpand
Measuring the speed of sound of quintessence.
TLDR
If the quintessence density is at least 1% of the critical density at the surface of last scattering the cosmic microwave background anisotropy can distinguish between models whose sound speed is near the speed of light versus near zero, which could be useful in distinguishing competing candidates for dark energy. Expand
Spherically Symmetrical Models in General Relativity
The field equations of general relativity areapplied to pressure-free spherically symmetrical systemsof particles. The equations of motion are determinedwithout the use of approximations and areExpand
Note on the gauge symmetries of unimodular gravity
It has been partially supported by the European Union FP7 ITN INVISIBLES (Marie Curie Actions, PITNGA-2011- 289442) and (HPRN-CT-200-00148); COST action MP1405 (Quantum Structure of Spacetime), COSTExpand
Einstein Spaces
Einstein-Räume(Mathematische Lehrbücher und Monographien. Heraus-gegeben von der Deutschen Akademie der Wissenschaften zu Berlin Institut für Mathematik. 11, Abteilung Mathematische Monographien,Expand
Spielen Gravitationsfelder im Aufbau der materiellen Elementarteilchen eine wesentliche Rolle
Weder die Newtonsche noch die relativistische Gravitationstheorie hat bisher der Theorie von der Konstitution der Materie einen Fortschritt gebracht. Demgegenuber soll im folgenden gezeigt werden,Expand
...
1
2
...