Enlarging minimal-supergravity parameter space by decreasing pre-nucleosynthesis Hubble rate in scalar-tensor cosmologies

被引：26

作者：

Catena, Riccardo ^{[1
]}

Fornengo, Nicolao ^{[2
,3
]}

Masiero, Antonio ^{[4
,5
]}

Pietroni, Massimo ^{[5
]}

Schelke, Mia ^{[3
]}

机构：

[1] Scuola Int Super Studi Avanzati, Via Beirut 2-4, I-34014 Trieste, Italy

[2] Univ Turin, Dipartimento Fis Teor, I-10125 Turin, Italy

[3] Ist Nazl Fis Nucl, Sez Torino, I-10125 Turin, Italy

[4] Univ Padua, Dipartimento Fis, I-35131 Padua, Italy

[5] Ist Nazl Fis Nucl, Sez Padova, I-35131 Padua, Italy

来源：

JOURNAL OF HIGH ENERGY PHYSICS | 2008年 / 10期

关键词：

Cosmology of Theories beyond the SM; Classical Theories of Gravity; Supergravity Models; Supersymmetry Phenomenology;

D O I：

10.1088/1126-6708/2008/10/003

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

We determine under what conditions Scalar Tensor cosmologies predict an expansion rate which is reduced as compared to the standard General Relativity case. We show that ST theories with a single matter sector typically predict an enchanced Hubble rate in the past, as a consequence of the requirement of an attractive fixed point towards General Relativity at late times. Instead, when additional matter sectors with different conformal factors are added, the late time convergence to General Relativity is mantained and at the same time a reduced expansion rate in the past can be driven. For suitable choices of the parameters which govern the scalar field evolution, a sizeable reduction of the Hubble rate prior to Big Bang Nucleosynthesis can be obtained. We then discuss the impact of these cosmological models on the relic abundance of dark matter in minimal Supergravity models: we show that the cosmologically allowed regions in parameter space are significantly enlarged in this class of ST theories with reduced Hubble rate. The ensuing effect on the potential reach of LHC are biefly discussed.

引用

页数：26

共 91 条

[1] Search for pair production of scalar bottom quarks in p(p)over-bar collisions at √s = 1.96 TeV [J].

Abazov, V. M. ;

Abbott, B. ;

Abolins, M. ;

Acharya, B. S. ;

Adams, M. ;

Adams, T. ;

Agelou, M. ;

Ahn, S. H. ;

Ahsan, M. ;

Alexeev, G. D. ;

Alkhazov, G. ;

Alton, A. ;

Alverson, G. ;

Alves, G. A. ;

Anastasoaie, M. ;

Andeen, T. ;

Anderson, S. ;

Andrieu, B. ;

Anzelc, M. S. ;

Arnoud, Y. ;

Arov, M. ;

Askew, A. ;

Asman, B. ;

Jesus, A. C. S. Assis ;

Atramentov, O. ;

Autermann, C. ;

Avila, C. ;

Ay, C. ;

Badaud, F. ;

Baden, A. ;

Bagby, L. ;

Baldin, B. ;

Bandurin, D. V. ;

Banerjee, P. ;

Banerjee, S. ;

Barberis, E. ;

Bargassa, P. ;

Baringer, P. ;

Barnes, C. ;

Barreto, J. ;

Bartlett, J. F. ;

Bassler, U. ;

Bauer, D. ;

Bean, A. ;

Begalli, M. ;

Begel, M. ;

Belanger-Champagne, C. ;

Bellantoni, L. ;

Bellavance, A. ;

Benitez, J. A. .

PHYSICAL REVIEW LETTERS, 2006, 97 (17)

[2] Search for Bs0→μ+μ- decays at D0 [J].

Abazov, V. M. ;

Abbott, B. ;

Abolins, M. ;

Acharya, B. S. ;

Adams, M. ;

Adams, T. ;

Aguilo, E. ;

Ahn, S. H. ;

Ahsan, M. ;

Alexeev, G. D. ;

Alkhazov, G. ;

Alton, A. ;

Alverson, G. ;

Alves, G. A. ;

Anastasoaie, M. ;

Ancu, L. S. ;

Andeen, T. ;

Anderson, S. ;

Andrieu, B. ;

Anzelc, M. S. ;

Arnoud, Y. ;

Arov, M. ;

Arthaud, M. ;

Askew, A. ;

Asman, B. ;

Jesus, A. C. S. Assis ;

Atramentov, O. ;

Autermann, C. ;

Avila, C. ;

Ay, C. ;

Badaud, F. ;

Baden, A. ;

Bagby, L. ;

Baldin, B. ;

Bandurin, D. V. ;

Banerjee, S. ;

Banerjee, P. ;

Barberis, E. ;

Barfuss, A. -F. ;

Bargassa, P. ;

Baringer, P. ;

Barreto, J. ;

Bartlett, J. F. ;

Bassler, U. ;

Bauer, D. ;

Beale, S. ;

Bean, A. ;

Begalli, M. ;

Begel, M. ;

Belanger-Champagne, C. .

PHYSICAL REVIEW D, 2007, 76 (09)

[3]

ABDALLAH J, 2001085 DELPHI COLL

[4] Search for neutral supersymmetric Higgs bosons in p(p)over-bar collisions at √s=1.8 TeV [J].

Affolder, T ;

Akimoto, H ;

Akopian, A ;

Albrow, MG ;

Amaral, P ;

Amendolia, SR ;

Amidei, D ;

Anikeev, K ;

Antos, J ;

Apollinari, G ;

Arisawa, T ;

Asakawa, T ;

Ashmanskas, W ;

Azfar, F ;

Azzi-Bacchetta, P ;

Bacchetta, N ;

Bailey, MW ;

Bailey, S ;

de Barbaro, P ;

Barbaro-Galtieri, A ;

Barnes, VE ;

Barnett, BA ;

Baroiant, S ;

Barone, M ;

Bauer, G ;

Bedeschi, F ;

Belforte, S ;

Bell, WH ;

Bellettini, G ;

Bellinger, J ;

Benjamin, D ;

Bensinger, J ;

Beretvas, A ;

Berge, JP ;

Berryhill, J ;

Bevensee, B ;

Bhatti, A ;

Binkley, M ;

Bisello, D ;

Bishai, M ;

Blair, RE ;

Blocker, C ;

Bloom, K ;

Blumenfeld, B ;

Blusk, SR ;

Bocci, A ;

Bocek, A ;

Bokhari, W ;

Bolla, G ;

Bonushkin, Y .

PHYSICAL REVIEW LETTERS, 2001, 86 (20) :4472-4478

[5] Production of massive stable particles in inflaton decay [J].

Allahverdi, R ;

Drees, M .

PHYSICAL REVIEW LETTERS, 2002, 89 (09) :913021-913024

[6] Thermalization after inflation and production of massive stable particles [J].

Allahverdi, R ;

Drees, M .

PHYSICAL REVIEW D, 2002, 66 (06)

[7]

[Anonymous], ISAJET

[8]

[Anonymous], COMMUNICATION

[9]

Baer H, 2004, J HIGH ENERGY PHYS

[10]

Baer H, 2003, J HIGH ENERGY PHYS

← 1 2 3 4 5 6 7 8 9 10 →