Darkness without dark matter and energy – generalized unimodular gravity
We suggest a Lorentz non-invariant generalization of the unimodular gravity theory, which is classically equivalent to general relativity with a locally inert (devoid of local degrees of freedom) perfect fluid having an equation of state with a constant parameter w. For the range of w near −1 this d...
| Main Authors: | , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2017-11-01
|
| Series: | Physics Letters B |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0370269317307578 |
| _version_ | 1818499539648118784 |
|---|---|
| author | A.O. Barvinsky A.Yu. Kamenshchik |
| author_facet | A.O. Barvinsky A.Yu. Kamenshchik |
| author_sort | A.O. Barvinsky |
| collection | DOAJ |
| description | We suggest a Lorentz non-invariant generalization of the unimodular gravity theory, which is classically equivalent to general relativity with a locally inert (devoid of local degrees of freedom) perfect fluid having an equation of state with a constant parameter w. For the range of w near −1 this dark fluid can play the role of dark energy, while for w=0 this dark dust admits spatial inhomogeneities and can be interpreted as dark matter. We discuss possible implications of this model in the cosmological initial conditions problem. In particular, this is the extension of known microcanonical density matrix predictions for the initial quantum state of the closed cosmology to the case of spatially open Universe, based on the imitation of the spatial curvature by the dark fluid density. We also briefly discuss quantization of this model necessarily involving the method of gauge systems with reducible constraints and the effect of this method on the treatment of recently! suggested mechanism of vacuum energy sequestering. |
| first_indexed | 2024-12-10T20:30:54Z |
| format | Article |
| id | doaj.art-897a2a92135d40a689506fd29b2390ea |
| institution | Directory Open Access Journal |
| issn | 0370-2693 1873-2445 |
| language | English |
| last_indexed | 2024-12-10T20:30:54Z |
| publishDate | 2017-11-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Physics Letters B |
| spelling | doaj.art-897a2a92135d40a689506fd29b2390ea2022-12-22T01:34:41ZengElsevierPhysics Letters B0370-26931873-24452017-11-01774C596310.1016/j.physletb.2017.09.045Darkness without dark matter and energy – generalized unimodular gravityA.O. Barvinsky0A.Yu. Kamenshchik1Theory Department, Lebedev Physics Institute, Leninsky Prospect 53, Moscow 119991, RussiaDipartimento di Fisica e Astronomia, Università di Bologna and INFN, Via Irnerio 46, 40126 Bologna, ItalyWe suggest a Lorentz non-invariant generalization of the unimodular gravity theory, which is classically equivalent to general relativity with a locally inert (devoid of local degrees of freedom) perfect fluid having an equation of state with a constant parameter w. For the range of w near −1 this dark fluid can play the role of dark energy, while for w=0 this dark dust admits spatial inhomogeneities and can be interpreted as dark matter. We discuss possible implications of this model in the cosmological initial conditions problem. In particular, this is the extension of known microcanonical density matrix predictions for the initial quantum state of the closed cosmology to the case of spatially open Universe, based on the imitation of the spatial curvature by the dark fluid density. We also briefly discuss quantization of this model necessarily involving the method of gauge systems with reducible constraints and the effect of this method on the treatment of recently! suggested mechanism of vacuum energy sequestering.http://www.sciencedirect.com/science/article/pii/S0370269317307578Unimodular gravityCosmologyDark matter |
| spellingShingle | A.O. Barvinsky A.Yu. Kamenshchik Darkness without dark matter and energy – generalized unimodular gravity Physics Letters B Unimodular gravity Cosmology Dark matter |
| title | Darkness without dark matter and energy – generalized unimodular gravity |
| title_full | Darkness without dark matter and energy – generalized unimodular gravity |
| title_fullStr | Darkness without dark matter and energy – generalized unimodular gravity |
| title_full_unstemmed | Darkness without dark matter and energy – generalized unimodular gravity |
| title_short | Darkness without dark matter and energy – generalized unimodular gravity |
| title_sort | darkness without dark matter and energy generalized unimodular gravity |
| topic | Unimodular gravity Cosmology Dark matter |
| url | http://www.sciencedirect.com/science/article/pii/S0370269317307578 |
| work_keys_str_mv | AT aobarvinsky darknesswithoutdarkmatterandenergygeneralizedunimodulargravity AT ayukamenshchik darknesswithoutdarkmatterandenergygeneralizedunimodulargravity |