Vacuum polarization of Dirac fermions in the cosmological de Sitter global monopole spacetime

被引：1
|
作者：
Ali, Md Sabir [1 ,2 ]
Bhattacharya, Sourav [1 ]
机构：
[1] Indian Inst Technol Ropar, Dept Phys, Rupnagar 140001, Punjab, India
[2] Indian Inst Sci Educ & Res Kolkata, Dept Phys Sci, Nadia 741246, W Bengal, India
来源：
PHYSICAL REVIEW D | 2022年 / 105卷 / 08期
关键词：
COSMIC-STRING SPACETIME; MASSLESS SCALAR FIELD; CASIMIR DENSITIES; MAGNETIC MONOPOLE;
D O I：
10.1103/PhysRevD.105.085006
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We study the vacuum polarization effects of the Dirac fermionic field induced by a pointlike global monopole located in the cosmological de Sitter spacetime. First we derive the four orthonormal Dirac modes in this background in a closed form. Quantizing the field using these modes, we then compute the fermionic condensate, < 0 vertical bar(Psi) over bar Psi vertical bar 0 >, as well as the vacuum expectation value of the energy-momentum tensor for a massive Dirac field, regularized in a particular way. We have used the Abel-Plana summation formula in order to extract the global monopole contribution to these quantities and have investigated their variations numerically with respect to relevant parameters.
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页数：21
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