ACCURATE NEUTRALINO RELIC DENSITY COMPUTATIONS IN SUPERGRAVITY MODELS

被引:49
作者
LOPEZ, JL [1 ]
NANOPOULOS, DV [1 ]
YUAN, K [1 ]
机构
[1] HOUSTON ADV RES CTR,ASTROPARTICLE PHYS GRP,THE WOODLANDS,TX 77381
来源
PHYSICAL REVIEW D | 1993年 / 48卷 / 06期
关键词
D O I
10.1103/PhysRevD.48.2766
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We investigate the question of the proper thermal averaging of neutralino annihilation amplitudes which possess poles and thresholds, as they impact on the calculated neutralino relic density and therefore on the cosmological viability of supersymmetric models. We focus on two typical resonances: namely, the Z boson and the lightest Higgs boson (h). In the context of supergravity models with radiative electroweak symmetry breaking, an exploration of the whole parameter space of the model is possible and the overall relevance of these sophisticated analyses can be ascertained. As an example we choose the minimal SU(5) supergravity model since the presence of such poles is essential to obtain a cosmologically acceptable model. We find that the proper thermal averaging is important for individual points in parameter space and that the fraction of cosmologically acceptable points is increased somewhat by the accurate procedure. However, qualitatively the new set of points is very similar to that obtained previously using the usual series approximations to the thermal average. We conclude that all phenomenological analyses based on the previously determined cosmologically allowed set remain valid.
引用
收藏
页码:2766 / 2776
页数:11
相关论文
共 56 条
[1]   NEUTRALINO DARK MATTER IN A CLASS OF UNIFIED THEORIES [J].
ABEL, SA ;
SARKAR, S ;
WHITTINGHAM, IB .
NUCLEAR PHYSICS B, 1993, 392 (01) :83-110
[2]   SUPERSYMMETRIC MASS-SPECTRUM IN SU(5) SUPERGRAVITY GRAND UNIFICATION [J].
ARNOWITT, R ;
NATH, P .
PHYSICAL REVIEW LETTERS, 1992, 69 (05) :725-728
[3]   COSMOLOGICAL CONSTRAINTS AND SU(5) SUPERGRAVITY GRAND UNIFICATION [J].
ARNOWITT, R ;
NATH, P .
PHYSICS LETTERS B, 1993, 299 (1-2) :58-63
[4]  
ARNOWITT R, 1993, PHYS LETT B, V307, pE403
[5]  
ARNOWITT R, 1983, APPLIED N EQUALS ONE
[6]   THE SEARCH FOR DARK MATTER [J].
CALDWELL, DO .
MODERN PHYSICS LETTERS A, 1990, 5 (20) :1543-1553
[7]   THE END OF COLD DARK MATTER [J].
DAVIS, M ;
EFSTATHIOU, G ;
FRENK, CS ;
WHITE, SDM .
NATURE, 1992, 356 (6369) :489-494
[8]  
DRESS M, 1993, PHYS REV D, V47, P376
[9]   SUPERSYMMETRIC RELICS FROM THE BIG-BANG [J].
ELLIS, J ;
HAGELIN, JS ;
NANOPOULOS, DV ;
OLIVE, K ;
SREDNICKI, M .
NUCLEAR PHYSICS B, 1984, 238 (02) :453-476
[10]   SUPERGRAVITY DARK MATTER [J].
ELLIS, J ;
ROSZKOWSKI, L .
PHYSICS LETTERS B, 1992, 283 (3-4) :252-260