Neutrino gravitational redshift and the electron fraction above nascent neutron stars

George M. Fuller; Yong Zhong Qian

doi:10.1016/0375-9474(96)00268-0

Neutrino gravitational redshift and the electron fraction above nascent neutron stars

George M. Fuller, Yong Zhong Qian

Physics and Astronomy (Twin Cities)

Research output: Contribution to journal › Article › peer-review

14 Scopus citations

Abstract

Neutrinos emitted from near the surface of the hot proto-neutron star produced by a supernova explosion may be subject to significant gravitational redshift at late times. Electron antineutrinos (ν̄_e) decouple deeper in the gravitational potential well of the neutron star than do the electron neutrinos (ν_e), so that the ν̄_e experience a larger redshift effect than do the ν_e. We show how this differential redshift can increase the electron fraction Y_e in the neutrino-heated ejecta from the neutron star. Any r-process nucleosynthesis originating in the neutrino-heated ejecta would require a low Y_e, implying that the differential redshift effect cannot be too large. In turn, this effect may allow nucleosynthesis to probe the nuclear equation of state parameters which set the neutron star radius and surface density scale height at times of order t_ph ≈ 10s to 25s after core bounce.

Original language	English (US)
Pages (from-to)	167-172
Number of pages	6
Journal	Nuclear Physics A
Volume	606
Issue number	1-2
DOIs	https://doi.org/10.1016/0375-9474(96)00268-0
State	Published - Aug 26 1996

Bibliographical note

Funding Information:
This work was supportedb y NSF Grant PHY95-03384 and NASA Grant NAG5-3062 at UCSD. Y.-Z. Qian was supportedb y the D. W. Morrisroe Fellowshipa t Caltech.

Publisher link

10.1016/0375-9474(96)00268-0

Find It

Find It at U of M Libraries

Cite this

@article{0032fcc1111046febba9da373fa0e3a0,

title = "Neutrino gravitational redshift and the electron fraction above nascent neutron stars",

abstract = "Neutrinos emitted from near the surface of the hot proto-neutron star produced by a supernova explosion may be subject to significant gravitational redshift at late times. Electron antineutrinos ({\=ν}e) decouple deeper in the gravitational potential well of the neutron star than do the electron neutrinos (νe), so that the {\=ν}e experience a larger redshift effect than do the νe. We show how this differential redshift can increase the electron fraction Ye in the neutrino-heated ejecta from the neutron star. Any r-process nucleosynthesis originating in the neutrino-heated ejecta would require a low Ye, implying that the differential redshift effect cannot be too large. In turn, this effect may allow nucleosynthesis to probe the nuclear equation of state parameters which set the neutron star radius and surface density scale height at times of order tph ≈ 10s to 25s after core bounce.",

author = "Fuller, {George M.} and Qian, {Yong Zhong}",

note = "Funding Information: This work was supportedb y NSF Grant PHY95-03384 and NASA Grant NAG5-3062 at UCSD. Y.-Z. Qian was supportedb y the D. W. Morrisroe Fellowshipa t Caltech.",

year = "1996",

month = aug,

day = "26",

doi = "10.1016/0375-9474(96)00268-0",

language = "English (US)",

volume = "606",

pages = "167--172",

journal = "Nuclear Physics A",

issn = "0375-9474",

publisher = "Elsevier B.V.",

number = "1-2",

}

TY - JOUR

T1 - Neutrino gravitational redshift and the electron fraction above nascent neutron stars

AU - Fuller, George M.

AU - Qian, Yong Zhong

N1 - Funding Information: This work was supportedb y NSF Grant PHY95-03384 and NASA Grant NAG5-3062 at UCSD. Y.-Z. Qian was supportedb y the D. W. Morrisroe Fellowshipa t Caltech.

PY - 1996/8/26

Y1 - 1996/8/26

N2 - Neutrinos emitted from near the surface of the hot proto-neutron star produced by a supernova explosion may be subject to significant gravitational redshift at late times. Electron antineutrinos (ν̄e) decouple deeper in the gravitational potential well of the neutron star than do the electron neutrinos (νe), so that the ν̄e experience a larger redshift effect than do the νe. We show how this differential redshift can increase the electron fraction Ye in the neutrino-heated ejecta from the neutron star. Any r-process nucleosynthesis originating in the neutrino-heated ejecta would require a low Ye, implying that the differential redshift effect cannot be too large. In turn, this effect may allow nucleosynthesis to probe the nuclear equation of state parameters which set the neutron star radius and surface density scale height at times of order tph ≈ 10s to 25s after core bounce.

AB - Neutrinos emitted from near the surface of the hot proto-neutron star produced by a supernova explosion may be subject to significant gravitational redshift at late times. Electron antineutrinos (ν̄e) decouple deeper in the gravitational potential well of the neutron star than do the electron neutrinos (νe), so that the ν̄e experience a larger redshift effect than do the νe. We show how this differential redshift can increase the electron fraction Ye in the neutrino-heated ejecta from the neutron star. Any r-process nucleosynthesis originating in the neutrino-heated ejecta would require a low Ye, implying that the differential redshift effect cannot be too large. In turn, this effect may allow nucleosynthesis to probe the nuclear equation of state parameters which set the neutron star radius and surface density scale height at times of order tph ≈ 10s to 25s after core bounce.

UR - http://www.scopus.com/inward/record.url?scp=0030602932&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0030602932&partnerID=8YFLogxK

U2 - 10.1016/0375-9474(96)00268-0

DO - 10.1016/0375-9474(96)00268-0

M3 - Article

AN - SCOPUS:0030602932

SN - 0375-9474

VL - 606

SP - 167

EP - 172

JO - Nuclear Physics A

JF - Nuclear Physics A

IS - 1-2

ER -

Neutrino gravitational redshift and the electron fraction above nascent neutron stars

Abstract

Bibliographical note

Publisher link

Find It

Other files and links

Fingerprint

Cite this