Constraints on astro-unparticle physics from SN 1987A
- Department of Physics and Electronics, SGTB Khalsa College, University of Delhi, Delhi-110007 (India)
- Department of Physics and Astrophysics, University of Delhi, Delhi-110007 (India)
SN 1987A observations have been used to place constraints on the interactions between standard model particles and unparticles. In this study we calculate the energy loss from the supernovae core through scalar, pseudo-scalar, vector, and pseudo-vector unparticle emission from nuclear bremsstrahlung for degenerate nuclear matter interacting through one pion exchange. In order to examine the constraints on d{sub U} = we considered the emission of scalars, pseudo-scalars, vectors, pseudo-vectors and tensors through the pair annihilation process e{sup +}e{sup -} {yields} U{sub {gamma}}. In addition we have re-examined other pair annihilation processes. The most stringent bounds on the dimensionless coupling constants for d{sub U}=1 and {Lambda}{sub U}=m{sub Z} are obtained from the nuclear bremsstrahlung process for the pseudo-scalar and pseudo-vector couplings |{lambda}{sup P}{sub 0,1}|{<=}4 Multiplication-Sign 10{sup -11}, and for tensor interaction, the best limit on dimensionless coupling is obtained from e{sup +}e{sup -} {yields} U{sub {gamma}} and we get |{lambda}{sup T}|{<=}6 Multiplication-Sign 10{sup -6}.
- OSTI ID:
- 22137822
- Journal Information:
- Journal of Cosmology and Astroparticle Physics, Vol. 2008, Issue 03; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1475-7516
- Country of Publication:
- United States
- Language:
- English
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