Effect of torsion on neutron star structure in Einstein-Cartan gravity - INSPIRE

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Effect of torsion on neutron star structure in Einstein-Cartan gravity

Cédric Jockel
(
- Potsdam, Max Planck Inst. and
- Frankfurt U.
)
,
Leon Menger
(
- U. Notre Dame, Dept. Math. and
- ETH, Zurich (main)
)

Jun 9, 2024

1 page

Published in:

Phys.Rev.D 110 (2024) 10, 104022

Published: Nov 12, 2024

e-Print:

2406.05851 [gr-qc]

DOI:

10.1103/PhysRevD.110.104022 (publication)

View in:

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Abstract: (APS)

Einstein-Cartan gravity is a close historical sibling of general relativity that allows for spacetime torsion. As a result, angular momentum couples to spacetime geometry in a similar way to energy. While consequences of this are well studied on cosmological scales, their role in neutron star physics is largely underexplored. We study the effects that torsion, sourced by either microphysical spin or macroscopic angular momentum, has on neutron stars. For this, we use a simplified polytropic model to quantify the microphysical coupling to torsion. We also derive expressions to model rotation-induced torsion effects and estimate the consequences for rotating neutron stars with different rotation rates. We find that the presence of torsion in general leads to neutron stars with smaller radii and masses but higher central densities. Realistic models for microphysical spin lead to torsion effects that have no relevant influence on the neutron star structure. Rotation-induced torsion effects, however, can decrease the radius by up to 900 m, which is comparable to the increase due to centrifugal forces. Depending on which effect dominates, this leads to a torsion-induced spin-up or spin-down of the neutron star. We conclude that torsion effects due to rotation can not be neglected and are large enough to be tested using current or near-future technology.

Note:

17+1 pages, 4 figures. v2: updated to match published version

space-time: torsion
general relativity
angular momentum
gravitation: Einstein-Cartan
structure
neutron star: rotation
geometry
spin
neutron star: mass
density

References(98)

Figures(4)

[1]

The Confrontation between General Relativity and Experiment

Clifford M. Will
(
- Florida U.
)

- Living Rev.Rel. 17 (2014) 4
•
e-Print:
- 1403.7377
•
DOI:
- 10.12942/lrr-2014-4

[2]

Testing General Relativity with Present and Future Astrophysical Observations

Emanuele Berti
(
- Mississippi U. and
- Lisbon, CENTRA
)
,
Enrico Barausse
(
- Paris, Inst. Astrophys. and
- Paris U., VI-VII
)
,
Vitor Cardoso
(
- Lisbon, IST and
- Perimeter Inst. Theor. Phys. and
- Lisbon, CENTRA
)
,
Leonardo Gualtieri
(
- Rome U. and
- INFN, Rome
)
,
Paolo Pani
(
- Rome U. and
- INFN, Rome and
- Lisbon, IST and
- Lisbon, CENTRA
)

et al.

- Class.Quant.Grav. 32 (2015) 243001
•
e-Print:
- 1501.07274
•
DOI:
- 10.1088/0264-9381/32/24/243001

[3]

Modified Gravity and Cosmology

Timothy Clifton
(
- Oxford U.
)
,
Pedro G. Ferreira
(
- Oxford U.
)
,
Antonio Padilla
(
- Nottingham U.
)
,
Constantinos Skordis
(
- Nottingham U.
)

- Phys.Rept. 513 (2012) 1-189
•
e-Print:
- 1106.2476
•
DOI:
- 10.1016/j.physrep.2012.01.001

[4]

(, Princeton, New Jersey, )

J. Leroy
,
J. Ritter

[5]

General Relativity with Spin and Torsion: Foundations and Prospects

- Rev.Mod.Phys. 48 (1976) 393-416
•
DOI:
- 10.1103/RevModPhys.48.393

[6]

Torsion gravity: A Reappraisal

H.I. Arcos
(
- Sao Paulo, IFT
)
,
J.G. Pereira
(
- Sao Paulo, IFT
)

- Int.J.Mod.Phys.D 13 (2004) 2193-2240
•
e-Print:
- gr-qc/0501017
•
DOI:
- 10.1142/S0218271804006462

[7]

Torsion gravity

R.T. Hammond
(
- North Dakota State U.
)

- Rept.Prog.Phys. 65 (2002) 599-649
•
DOI:
- 10.1088/0034-4885/65/5/201

[8]

Review on $f (Q)$ gravity

Lavinia Heisenberg
(
- Heidelberg U.
)

- Phys.Rept. 1066 (2024) 1-78
•
e-Print:
- 2309.15958
•
DOI:
- 10.1016/j.physrep.2024.02.001

[9]

The Geometrical Trinity of Gravity

Jose Beltrán Jiménez
(
- Salamanca U., IUFFyM and
- Salamanca U.
)
,
Lavinia Heisenberg
(
- Zurich, ETH
)
,
Tomi S. Koivisto
(
- Nordita and
- Royal Inst. Tech., Stockholm and
- NICPB, Tallinn
)

- Universe 5 (2019) 7, 173
•
e-Print:
- 1903.06830
•
DOI:
- 10.3390/universe5070173

[10]

E. Cartan

- Ann. Sci. l’Éc. Norm. Supér. 40 (1923) 325
•
DOI:
- 10.24033/asens.751

[11]

E. Cartan

- Ann. Sci. l’Éc. Norm. Supér. 41 (1924) 1
•
DOI:
- 10.24033/asens.753

[12]

E. Cartan

- Ann. Sci. l’Éc. Norm. Supér. 42 (1925) 17
•
DOI:
- 10.24033/asens.761

[13]

Lorentz invariance and the gravitational field

T.W.B. Kibble
(
- Imperial Coll., London
)

- J.Math.Phys. 2 (1961) 212-221,
•
DOI:
- 10.1063/1.1703702

[14]

The Physical Structure of General Relativity

D.W. Sciama

- Rev.Mod.Phys. 36 (1964) 1, 463
•
DOI:
- 10.1103/RevModPhys.36.463

[14]

The Physical structure of general relativity

Dennis W. Sciama
(
- Cambridge U.
)

- Rev.Mod.Phys. 36 (1964) 463-469,
- Rev.Mod.Phys. 36 (1964) 1103-1103 (erratum)
•
DOI:
- 10.1103/RevModPhys.36.1103

[15]

On the gauge aspects of gravity

Frank Gronwald
(
- Cologne U.
)
,
Friedrich W. Hehl
(
- Cologne U.
)

•
e-Print:
- gr-qc/9602013

[16]

General relativity as a special case of Poincaré gauge gravity

Yuri N. Obukhov
(
- NSI, Moscow
)
,
Friedrich W. Hehl
(
- Cologne U.
)

- Phys.Rev.D 102 (2020) 4, 044058
•
e-Print:
- 2007.00043
•
DOI:
- 10.1103/PhysRevD.102.044058

[17]

Intrinsic spin requires gravity with torsion and curvature

Nikodem Poplawski
(
- Indiana U.
)

e-Print:
- 1304.0047

[18]

Big bounce from spin and torsion

Nikodem J. Poplawski
(
- Indiana U.
)

- Gen.Rel.Grav. 44 (2012) 1007-1014
•
e-Print:
- 1105.6127
•
DOI:
- 10.1007/s10714-011-1323-2

[19]

Analysis of big bounce in Einstein–Cartan cosmology

- Class.Quant.Grav. 37 (2020) 2, 025011
•
e-Print:
- 1906.11824
•
DOI:
- 10.1088/1361-6382/ab5cb9

[20]

Higgs-Dilaton inflation in Einstein-Cartan gravity

Matteo Piani
(
- Lisbon, CENTRA
)
,
Javier Rubio
(
- Lisbon, CENTRA
)

- JCAP 05 (2022) 05, 009
•
e-Print:
- 2202.04665
•
DOI:
- 10.1088/1475-7516/2022/05/009

[21]

Preheating in Einstein-Cartan Higgs Inflation: oscillon formation

Matteo Piani
(
- Lisbon, CENTRA
)
,
Javier Rubio
(
- Madrid U.
)

- JCAP 12 (2023) 002
•
e-Print:
- 2304.13056
•
DOI:
- 10.1088/1475-7516/2023/12/002

[22]

How does the electromagnetic field couple to gravity, in particular to metric, nonmetricity, torsion, and curvature?

Friedrich W. Hehl
(
- Princeton, Inst. Advanced Study and
- Cologne U.
)
,
Yuri N. Obukhov
(
- Moscow State U.
)

- Lect.Notes Phys. 562 (2001) 479,
•
e-Print:
- gr-qc/0001010
•
DOI:
- 10.1007/3-540-40988-2_25

[23]

Gauge Theory of Gravity and Spacetime

Friedrich W Hehl

- Einstein Stud. 13 (2017) 145-169
•
e-Print:
- 1204.3672
•
DOI:
- 10.1007/978-1-4939-3210-8_5

[24]

Pseudo-orthogonal Yang-Mills theories and connections to gravity

Giovanni Mistretta
(
- Utrecht U.
)
,
Tomislav Prokopec
(
- Utrecht U.
)

e-Print:
- 2310.14827

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