# 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

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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 a… Expand

Unimodular cosmology and the weight of energy

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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. The… Expand

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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 this… Expand

Can one tell Einstein's unimodular theory from Einstein's general relativity?

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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 in… Expand

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- Physics, Medicine
- Physical review letters
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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

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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 are… Expand

Note on the gauge symmetries of unimodular gravity

- Physics
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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), COST… Expand

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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