Spin-dominated inflation in the Einstein-Cartan theory
Abstract
In the framework of the simplest Einstein-Cartan generalization of the standard cosmological model, it is shown that an inflationary phase may occur at a sufficiently early epoch, during which the dominant contributions to the effective energy-momentum tensor are represented by the spin density of the matter sources. The general features of this inflationary scenario are briefly discussed, and in particular the possibility of obtaining an expansion rate different from that of the standard exponential inflation is stressed.
Integrity signals
Registry
Cites
Statistics
Claims the paper makes
Claims other papers make about this one
Each is checked against this paper’s own text: does it say what the citing paper says it does?
In the comoving frame, the Einstein field Equation (6) for the FLRW metric becomes the Friedmann equations (10) and (11).
“In the comoving frame of reference, in which the four-velocity u i of the cosmological spin fluid satisfies u 0 =1 and u α =0 (α denotes spatial indices), the Einstein field Equation (6) for this metric becomes the Friedmann equations (the cosmological constant is negligible in the early universe; Kuchowicz 1978;Gasperini 1986;Brechet et al. 2008;Popławski 2010cPopławski , 2011a)):”
From UNIVERSE IN A BLACK HOLE IN EINSTEIN–CARTAN GRAVITY (2016) · cites this paper as Gasperini 1986
The square of the spin density for a fluid consisting of fermions with no spin polarization is given by Equation (8).
“The square of the spin density for a fluid consisting of fermions with no spin polarization is given by (Nurgaliev & Ponomariev 1983;Gasperini 1986;Brechet et al. 2008”
From UNIVERSE IN A BLACK HOLE IN EINSTEIN–CARTAN GRAVITY (2016) · cites this paper as Gasperini 1986
Cites
Inflationary universe: A possible solution to the horizon and flatness problems
Guth, A. H. (1981) · Physical Review D · doi:10.1103/physrevd.23.347 · Cited by 9,983 · see citing works
Flagged first, then by citations
Cited by
Sorted by citations
Cosmology with torsion: An alternative to cosmic inflation
Popławski, N. J. (2010) · Physics Letters B · doi:10.1016/j.physletb.2010.09.056 · Cited by 205 · see citing works
Nonsingular, big-bounce cosmology from spinor-torsion coupling
Popławski, N. (2012) · Physical Review D · doi:10.1103/physrevd.85.107502 · Cited by 180 · see citing works
UNIVERSE IN A BLACK HOLE IN EINSTEIN–CARTAN GRAVITY
Popławski, N. (2016) · The Astrophysical Journal · doi:10.3847/0004-637x/832/2/96 · Cited by 91 · see citing works
A nonsingular, anisotropic universe in a black hole with torsion and particle production
Popławski, N. J. (2021) · General Relativity and Gravitation · doi:10.1007/s10714-021-02790-7 · Cited by 12 · see citing works
Energy condition respecting warp drives: the role of spin in Einstein–Cartan theory
DeBenedictis, A., & Ilijić, S. (2018) · Classical and Quantum Gravity · doi:10.1088/1361-6382/aae326 · Cited by 4 · see citing works
- Authors
- Gasperini, M.
- Affiliations
- Istituto Nazionale di Fisica Nucleare, Sezione di Torino (IT)
- Corresponding author
- Gasperini, M.
- ORCID
- Gasperini, M.
- Venue
- Physical Review Letters
- Publisher
- American Physical Society (APS)
- Published
- 1986-06-30
- Volume
- 56
- Issue
- 26
- Pages
- 2873-2876
- ISSN
- 0031-9007 (ISSN-L)
- OpenAlex
- W2088368747
- Cited by
- 146
- References
- 1
- Citations by year
- 2026: 6 · 2025: 10 · 2024: 9 · 2023: 7 · 2022: 3 · 2021: 8 · 2020: 5 · 2019: 13 · 2018: 9 · 2017: 8 · 2016: 3 · 2015: 3 · 2014: 3 · 2013: 3 · 2012: 4
- FWCI
- 4.24
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Physical Review Letters (publishedVersion)
- PubMed (publishedVersion)
- CINECA IRIS Institutional Research Information System (University of Bari Aldo Moro) (submittedVersion)
- Topics
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Cosmology and Gravitation Theories
- Physical Sciences › Physics and Astronomy › Statistical and Nonlinear Physics › Noncommutative and Quantum Gravity Theories
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Relativity and Gravitational Theory
- Keywords
- Einstein-Cartan theory, spin density, early universe inflation, effective stress-energy tensor, modified gravity, Hubble parameter, exponential inflation
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
What counts as a claim ›How we measure confidence ›How we check this ›
Are you an author, or do you see a problem with this page? Request a review
