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White dwarf bounds on charged massive particles

Authors :
Peter W. Graham
Michael A. Fedderke
Surjeet Rajendran
Source :
Physical Review
Publication Year :
2020
Publisher :
American Physical Society (APS), 2020.

Abstract

White dwarfs (WD) effectively act as high-gain amplifiers for relatively small energy deposits within their volume via their supernova instability. In this paper, we consider the ways a galactic abundance of O(1)-charged massive relics (i.e., CHAMPs) could trigger this instability, thereby destroying old WD. The dense central core structure formed inside the WD when heavy CHAMPs sink to its center can trigger a supernova via injection of energy during collapse phases, via direct density-enhanced (pycnonuclear) fusion processes of carbon nuclei dragged into the core by the CHAMPs, or via the formation of a black hole (BH) at the center of the WD. In the latter scenario, Hawking radiation from the BH can ignite the star if the BH forms with a sufficiently small mass; if the BH instead forms at large enough mass, heating of carbon nuclei that accrete onto the BH as it grows in size may be able to achieve the same outcome (with the conservative alternative being simply that the WD is devoured by the BH). The known existence of old WD that have not been destroyed by these mechanisms allows us to improve by many orders of magnitude on the existing CHAMP abundance constraints in the regime of large CHAMP mass, mX∼1011–1018 GeV. Additionally, in certain regions of parameter space, we speculate that this setup could provide a trigger mechanism for the calcium-rich gap transients: a class of anomalous, subluminous supernova events that occur far outside of a host galaxy.

Details

ISSN :
24700029 and 24700010
Volume :
101
Database :
OpenAIRE
Journal :
Physical Review D
Accession number :
edsair.doi.dedup.....e0ed942bb3ec556d843518978a7b67b7
Full Text :
https://doi.org/10.1103/physrevd.101.115021