---
_id: '15235'
abstract:
- lang: eng
text: Radiative corrections of quantum electrodynamics cause a vacuum threaded by
a magnetic field to be birefringent. This means that radiation of different polarizations
travels at different speeds. Even in the strong magnetic fields of astrophysical
sources, the difference in speed is small. However, it has profound consequences
for the extent of polarization expected from strongly magnetized sources. We demonstrate
how the birefringence arises from first principles, show how birefringence affects
the polarization state of radiation and present recent calculations for the expected
polarization from magnetars and X-ray pulsars.
article_number: '76'
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Jeremy
full_name: Heyl, Jeremy
last_name: Heyl
- first_name: Ilaria
full_name: Caiazzo, Ilaria
id: 8ae5b6e7-2a03-11ee-914d-b58ed7a3b47d
last_name: Caiazzo
orcid: 0000-0002-4770-5388
citation:
ama: 'Heyl J, Caiazzo I. Strongly magnetized sources: QED and X-ray polarization.
Galaxies. 2018;6(3). doi:10.3390/galaxies6030076'
apa: 'Heyl, J., & Caiazzo, I. (2018). Strongly magnetized sources: QED and X-ray
polarization. Galaxies. MDPI. https://doi.org/10.3390/galaxies6030076'
chicago: 'Heyl, Jeremy, and Ilaria Caiazzo. “Strongly Magnetized Sources: QED and
X-Ray Polarization.” Galaxies. MDPI, 2018. https://doi.org/10.3390/galaxies6030076.'
ieee: 'J. Heyl and I. Caiazzo, “Strongly magnetized sources: QED and X-ray polarization,”
Galaxies, vol. 6, no. 3. MDPI, 2018.'
ista: 'Heyl J, Caiazzo I. 2018. Strongly magnetized sources: QED and X-ray polarization.
Galaxies. 6(3), 76.'
mla: 'Heyl, Jeremy, and Ilaria Caiazzo. “Strongly Magnetized Sources: QED and X-Ray
Polarization.” Galaxies, vol. 6, no. 3, 76, MDPI, 2018, doi:10.3390/galaxies6030076.'
short: J. Heyl, I. Caiazzo, Galaxies 6 (2018).
date_created: 2024-03-26T10:38:46Z
date_published: 2018-07-21T00:00:00Z
date_updated: 2024-04-08T07:02:25Z
day: '21'
doi: 10.3390/galaxies6030076
extern: '1'
external_id:
arxiv:
- '1802.00358'
intvolume: ' 6'
issue: '3'
keyword:
- Astronomy and Astrophysics
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.3390/galaxies6030076
month: '07'
oa: 1
oa_version: Published Version
publication: Galaxies
publication_identifier:
eissn:
- 2075-4434
publication_status: published
publisher: MDPI
quality_controlled: '1'
scopus_import: '1'
status: public
title: 'Strongly magnetized sources: QED and X-ray polarization'
tmp:
image: /images/cc_by.png
legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
short: CC BY (4.0)
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 6
year: '2018'
...
---
_id: '15237'
abstract:
- lang: eng
text: 'The effect of vacuum birefringence is one of the first predictions of quantum
electrodynamics (QED): the presence of a charged Dirac field makes the vacuum
birefringent when threaded by magnetic fields. This effect, extremely weak for
terrestrial magnetic fields, becomes important for highly magnetized astrophysical
objects, such as accreting black holes. In the X-ray regime, the polarization
of photons traveling in the magnetosphere of a black hole is not frozen at emission
but is changed by the local magnetic field. We show that, for photons traveling
along the plane of the disk, where the field is expected to be partially organized,
this results in a depolarization of the X-ray radiation. Because the amount of
depolarization depends on the strength of the magnetic field, this effect can
provide a way to probe the magnetic field in black-hole accretion disks and to
study the role of magnetic fields in astrophysical accretion in general.'
article_number: '57'
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Ilaria
full_name: Caiazzo, Ilaria
id: 8ae5b6e7-2a03-11ee-914d-b58ed7a3b47d
last_name: Caiazzo
orcid: 0000-0002-4770-5388
- first_name: Jeremy
full_name: Heyl, Jeremy
last_name: Heyl
citation:
ama: Caiazzo I, Heyl J. Probing black hole magnetic fields with QED. Galaxies.
2018;6(2). doi:10.3390/galaxies6020057
apa: Caiazzo, I., & Heyl, J. (2018). Probing black hole magnetic fields with
QED. Galaxies. MDPI. https://doi.org/10.3390/galaxies6020057
chicago: Caiazzo, Ilaria, and Jeremy Heyl. “Probing Black Hole Magnetic Fields with
QED.” Galaxies. MDPI, 2018. https://doi.org/10.3390/galaxies6020057.
ieee: I. Caiazzo and J. Heyl, “Probing black hole magnetic fields with QED,” Galaxies,
vol. 6, no. 2. MDPI, 2018.
ista: Caiazzo I, Heyl J. 2018. Probing black hole magnetic fields with QED. Galaxies.
6(2), 57.
mla: Caiazzo, Ilaria, and Jeremy Heyl. “Probing Black Hole Magnetic Fields with
QED.” Galaxies, vol. 6, no. 2, 57, MDPI, 2018, doi:10.3390/galaxies6020057.
short: I. Caiazzo, J. Heyl, Galaxies 6 (2018).
date_created: 2024-03-26T10:39:26Z
date_published: 2018-05-24T00:00:00Z
date_updated: 2024-10-14T12:33:20Z
day: '24'
doi: 10.3390/galaxies6020057
extern: '1'
external_id:
arxiv:
- '1805.11018'
intvolume: ' 6'
issue: '2'
keyword:
- Astronomy and Astrophysics
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.3390/galaxies6020057
month: '05'
oa: 1
oa_version: Published Version
publication: Galaxies
publication_identifier:
eissn:
- 2075-4434
publication_status: published
publisher: MDPI
quality_controlled: '1'
scopus_import: '1'
status: public
title: Probing black hole magnetic fields with QED
tmp:
image: /images/cc_by.png
legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
short: CC BY (4.0)
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 6
year: '2018'
...