Beyond ΛCDM: Problems, solutions, and the road ahead
Despite its continued observational successes, there is a persistent (and growing) interest in
extending cosmology beyond the standard model, Λ CDM. This is motivated by a range of …
extending cosmology beyond the standard model, Λ CDM. This is motivated by a range of …
Unimodular gravity vs general relativity: a status report
Unimodular gravity (UG) is an alternative to general relativity (GR) which, however, is so
closely related to the latter that one can wonder to what extent they are different. The …
closely related to the latter that one can wonder to what extent they are different. The …
Can quantum fluctuations differentiate between standard and unimodular gravity?
A bstract We formally prove the existence of a quantization procedure that makes the path
integral of a general diffeomorphism-invariant theory of gravity, with fixed total spacetime …
integral of a general diffeomorphism-invariant theory of gravity, with fixed total spacetime …
Quantum corrections to unimodular gravity
A bstract The problem of the comological constant appears in a new light in Unimodular
Gravity. In particular, the zero momentum piece of the potential (that is, the constant piece …
Gravity. In particular, the zero momentum piece of the potential (that is, the constant piece …
Unimodular approaches to the cosmological constant problem
P Jiroušek - Universe, 2023 - mdpi.com
We review selected aspects of unimodular gravity and we discuss its viability as a solution of
the old cosmological constant problem. In unimodular gravity, the cosmological constant is …
the old cosmological constant problem. In unimodular gravity, the cosmological constant is …
Path integral of unimodular gravity
Path integral of unimodular gravity Page 1 Path integral of unimodular gravity R. de León
Ardón,1,2,* N. Ohta,3,4,† and R. Percacci1,2,‡ 1International School for Advanced Studies, via …
Ardón,1,2,* N. Ohta,3,4,† and R. Percacci1,2,‡ 1International School for Advanced Studies, via …
Embedding Unimodular Gravity in string theory
A bstract Unimodular Gravity is a theory displaying Weyl rescalings of the metric and
transverse (volume-preserving) diffeomorphisms as gauge symmetries, as opposed to the …
transverse (volume-preserving) diffeomorphisms as gauge symmetries, as opposed to the …
Noether charge formalism for Weyl invariant theories of gravity
Gravitational theories invariant under transverse diffeomorphisms and Weyl transformations
have the same classical solutions as the corresponding fully diffeomorphism invariant …
have the same classical solutions as the corresponding fully diffeomorphism invariant …
Noether charge formalism for Weyl transverse gravity
Weyl transverse gravity (WTG) is a gravitational theory that is invariant under transverse
diffeomorphisms and Weyl transformations. It is characterised by having the same classical …
diffeomorphisms and Weyl transformations. It is characterised by having the same classical …
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 …
unimodular gravity. In particular, the zero-momentum piece of the potential does not …