1.
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From Minkowski to de Sitter in Multifield No-Scale Models
/ Ellis, John (King's Coll. London ; CERN ; NICPB, Tallinn) ; Nagaraj, Balakrishnan (Texas A-M) ; Nanopoulos, Dimitri V. (Texas A-M ; HARC, Woodlands ; Athens Academy) ; Olive, Keith A. (Minnesota U., Theor. Phys. Inst.) ; Verner, Sarunas (Minnesota U., Theor. Phys. Inst.)
We show the uniqueness of superpotentials leading to Minkowski vacua of single-field no-scale supergravity models, and the construction of dS/AdS solutions using pairs of these single-field Minkowski superpotentials. We then extend the construction to two- and multifield no-scale supergravity models, providing also a geometrical interpretation. [...]
arXiv:1907.09123; KCL-PH-TH/2019-62; CERN-TH-2019-119; ACT-04-19; MI-TH-1928, UMN-TH-3829/19; MI-TH-1928,
UMN-TH-3829/19; FTPI-MINN-19/20.-
2019-10-14 - 31 p.
- Published in : JHEP 1910 (2019) 161
Article from SCOAP3: scoap3-fulltext - PDF; scoap - PDF; Fulltext: PDF;
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2.
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De Sitter Vacua in No-Scale Supergravity
/ Ellis, John (King's Coll. London ; CERN) ; Nagaraj, Balakrishnan (Texas A-M) ; Nanopoulos, Dimitri V. (Texas A-M ; HARC, Woodlands ; Athens Academy) ; Olive, Keith A. (Minnesota U., Theor. Phys. Inst.)
No-scale supergravity is the appropriate general framework for low-energy effective field theories derived from string theory. The simplest no-scale Kähler potential with a single chiral field corresponds to a compactification to flat Minkowski space with a single volume modulus, but generalizations to single-field no-scale models with de Sitter vacua are also known. [...]
arXiv:1809.10114; KCL-PH-TH/2018-52; CERN-TH/2018-206; CERN-TH-2018-206; ACT-01-18; MI-TH-1889; UMN-TH-3726/18; MI-TH-1889,
UMN-TH-3726/18; FTPI-MINN-18/15.-
2018-11-19 - 22 p.
- Published in : JHEP 11 (2018) 110
Article from SCOAP3: scoap3-fulltext - PDF; scoap - PDF; Fulltext: PDF;
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3.
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A General Classification of Starobinsky-like Inflationary Avatars of SU(2,1)/SU(2) x U(1) No-Scale Supergravity
/ Ellis, John (King's Coll. London ; CERN) ; Nanopoulos, Dimitri V. (Texas A-M ; HARC, Woodlands ; Athens Academy) ; Olive, Keith A. (Minnesota U., Theor. Phys. Inst.) ; Verner, Sarunas (Minnesota U., Theor. Phys. Inst.)
Measurements of the cosmic microwave background (CMB) favour models of inflation with a small tensor-to-scalar ratio $r$, as predicted by the Starobinsky $R + R^2$ model. It has been shown previously that various models based on no-scale supergravity with different forms of superpotential make predictions similar to those of the Starobinsky model. [...]
arXiv:1812.02192; KCL-PH-TH-2018-69; KCL-PH-TH/2018-69; CERN-TH-2018-260; ACT-04-18; MI-TH-1813; UMN-TH-3806-18; FTPI-MINN-18-21; MI-TH-1813,
UMN-TH-3806/18; FTPI-MINN-18/21.-
2019-03-18 - 21 p.
- Published in : JHEP 03 (2019) 099
Article from SCOAP3: scoap3-fulltext - PDF; scoap - PDF; Fulltext: PDF;
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4.
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A Unified No-Scale Model of Modulus Fixing, Inflation, Supersymmetry Breaking and Dark Energy
/ Ellis, John (King's Coll. London ; CERN ; NICPB, Tallinn) ; Nanopoulos, Dimitri V. (Texas A-M ; HARC, Woodlands ; Athens Academy) ; Olive, Keith A. (Minnesota U., Theor. Phys. Inst.) ; Verner, Sarunas (Minnesota U., Theor. Phys. Inst.)
We present a minimal SU(2,1)/SU(2) x U(1) no-scale model that incorporates in an economical way modulus fixing, Starobinsky-like inflation, an adjustable scale for supersymmetry breaking and the possibility of a small cosmological constant, a.k.a. dark energy..
arXiv:1903.05267; KCL-PH-TH/2019-24; CERN-TH-2019-024; ACT-01-19; MI-TH-1917; MI-TH-1917,
UMN-TH-3820/19; FTPI-MINN-19/11; UMN-TH-3820/19.-
2019-07-19 - 6 p.
- Published in : Phys. Rev. D 100 (2019) 025009
Article from SCOAP3: PDF; Fulltext: PDF; Fulltext from Publisher: PDF;
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5.
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From $R^2$ Gravity to No-Scale Supergravity
/ Ellis, John (King's Coll. London ; NICPB, Tallinn ; CERN) ; Nanopoulos, Dimitri V. (Texas A-M ; HARC, Woodlands ; Athens Academy) ; Olive, Keith A. (Minnesota U., Theor. Phys. Inst.)
We show that $R^2$ gravity coupled conformally to scalar fields is equivalent to the real bosonic sector of SU(N,1)/SU(N)$\times$U(1) no-scale supergravity, where the conformal factor can be identified with the K\"ahler potential, and we review the construction of Starobinsky-like models of inflation within this framework..
arXiv:1711.11051; KCL-PH-TH-2017-60; CERN-PH-TH-2017-248; CERN-TH-2017-248; ACT-06-17; MI-TH-1771; UMN-TH-3706-17; FTPI-MINN-17-22.-
2018-02-26 - 8 p.
- Published in : Phys. Rev. D 97 (2018) 043530
Article from SCOAP3: PDF; Fulltext: PDF;
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6.
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Proton Decay: Flipped vs Unflipped SU(5)
/ Ellis, John (King's Coll. London ; CERN ; NICPB, Tallinn) ; Garcia, Marcos A.G. (Madrid, IFT) ; Nagata, Natsumi (Tokyo U. ; HARC, Woodlands ; Athens Academy) ; Nanopoulos, Dimitri V. (Texas A-M ; HARC, Woodlands ; Athens Academy) ; Olive, Keith A. (Minnesota U., Theor. Phys. Inst.)
We analyze nucleon decay modes in a no-scale supersymmetric flipped SU(5) GUT model, and contrast them with the predictions for proton decays via dimension-6 operators in a standard unflipped supersymmetric SU(5) GUT model. We find that these GUT models make very different predictions for the ratios $\Gamma(p \to \pi^0 \mu^+)/\Gamma(p \to \pi^0 e^+)$, $\Gamma(p \to \pi^+ \bar{\nu})/\Gamma(p \to \pi^0 e^+)$, $\Gamma(p \to K^0 e^+)/\Gamma(p \to \pi^0 e^+)$ and $\Gamma(p \to K^0 \mu^+)/\Gamma(p \to \pi^0 \mu^+)$, and that predictions for the ratios $\Gamma(p \to \pi^0 \mu^+)/\Gamma(p \to \pi^0 e^+)$ and $\Gamma(p \to \pi^+ \bar{\nu})/\Gamma(p \to \pi^0 e^+)$ also differ in variants of the flipped SU(5) model with normal- or inverse-ordered light neutrino masses. [...]
arXiv:2003.03285; KCL-PH-TH/2020-10; CERN-TH-2020-031; UT-20-03; ACT-01-20; MI-TH-206, UMN-TH-3914/20; MI-TH-206,
UMN-TH-3914/20; FTPI-MINN-20/04; IFT-UAM/CSIC-20-36.-
2020-05-06 - 25 p.
- Published in : JHEP 2005 (2020) 021
Article from SCOAP3: scoap3-fulltext - PDF; scoap - PDF; Fulltext: PDF;
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7.
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No-Scale SU(5) Super-GUTs
/ Ellis, John (King's Coll. London ; CERN) ; Evans, Jason L. (Korea Inst. Advanced Study, Seoul) ; Nagata, Natsumi (Tokyo U.) ; Nanopoulos, Dimitri V. (Texas A-M ; HARC, Woodlands ; Athens Academy) ; Olive, Keith A. (Minnesota U.)
We reconsider the minimal SU(5) Grand Unified Theory (GUT) in the context of no-scale supergravity, assuming that the soft supersymmetry-breaking parameters satisfy universality conditions at some input scale M_in above the GUT scale M_GUT. When setting up such a no-scale super-GUT model, special attention must be paid to avoiding the Scylla of rapid proton decay and the Charybdis of an excessive density of cold dark matter, while also having an acceptable mass for the Higgs boson. [...]
arXiv:1702.00379; KCL-PH-TH-2017-05; CERN-TH-2017-010; KIAS-P17008; UT-17-03; MI-TH-1738; UMN-TH-3618-17; FTPI-MINN-17-02; ACT-01-17.-
2017-04-12 - 24 p.
- Published in : Eur. Phys. J. C 77 (2017) 232
Article from SCOAP3: PDF; Fulltext: PDF; Springer Open Access article: PDF;
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8.
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Unified No-Scale Attractors
/ Ellis, John (King's Coll. London ; CERN ; NICPB, Tallinn) ; Nanopoulos, Dimitri V. (TAMU, College Station ; HARC, Woodlands ; Athens Academy) ; Olive, Keith A. (Minnesota U.) ; Verner, Sarunas (Minnesota U.)
We have presented previously a general treatment of Starobinsky-like inflation in no-scale supergravity where the tensor-to-scalar ratio $r = 3(1 - n_s)^2$, and $n_s$ is the tilt of the scalar perturbations. In particular, we have shown how this scenario can be unified with modulus fixing, supersymmetry breaking and a small cosmological constant. [...]
arXiv:1906.10176; KCL-PH-TH/2019-51; CERN-TH-2019-089; ACT-03-19; MI-TH-1923; UMN-TH-3826/19; MI-TH-1923,
UMN-TH-3826/19; FTPI-MINN-19/17.-
2019-09-20 - 32 p.
- Published in : JCAP 1909 (2019) 040
Fulltext: PDF;
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9.
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Starobinsky-Like Inflation and Neutrino Masses in a No-Scale SO(10) Model
/ Ellis, John (CERN ; King's Coll. London) ; Garcia, Marcos A. G. (Rice U.) ; Nagata, Natsumi (Tokyo U.) ; Nanopoulos, Dimitri V. (Athens Academy ; HARC, Woodlands ; Texas A-M) ; Olive, Keith A. (Minnesota U., Theor. Phys. Inst.)
Using a no-scale supergravity framework, we construct an SO(10) model that makes predictions for cosmic microwave background observables similar to those of the Starobinsky model of inflation, and incorporates a double-seesaw model for neutrino masses consistent with oscillation experiments and late-time cosmology. We pay particular attention to the behaviour of the scalar fields during inflation and the subsequent reheating..
arXiv:1609.05849; KCL-PH-TH-2016-54; CERN-TH-2016-188; UT-16-29; ACT-05-16; MI-TH-1625; UMN-TH-3603-16; FTPI-MINN-16-26; KCL-PH-TH-2016-54; CERN-TH-2016-188; UT-16-29; ACT-05-16; MI-TH-162; UMN-TH-3603-16; FTPI-MINN-16-26.-
2016-11-08 - 38 p.
- Published in : JCAP 11 (2016) 018
Article from SCOAP3: PDF; Fulltext: arXiv:1609.05849 - PDF; 10.1088_1475-7516_2016_11_018 - PDF; IOP Open Access article: PDF; External link: Preprint
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10.
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Flipped ${g_\mu - 2}$
/ Ellis, John (King's Coll. London ; CERN ; NICPB, Tallinn) ; Evans, Jason L. (Tsung-Dao Lee Inst., Shanghai ; Shanghai Jiao Tong U.) ; Nagata, Natsumi (Tokyo U.) ; Nanopoulos, Dimitri V. (Texas A-M ; Baylor U. ; HARC, Woodlands ; Athens Academy ; Athens U.) ; Olive, Keith A. (Minnesota U., Theor. Phys. Inst.)
We analyze the possible magnitude of the supersymmetric contribution to $g_\mu - 2$ in a flipped SU(5) GUT model. Unlike other GUT models which are severely constrained by universality relations, in flipped SU(5) the U(1) gaugino mass and the soft supersymmetry-breaking masses of right-handed sleptons are unrelated to the other gaugino, slepton and squark masses. [...]
arXiv:2107.03025; KCL-PH-TH/2021-46,CERN-TH-2021-099; ACT-1-21; MI-HET-751,
UMN-TH-4018/21; FTPI-MINN-21/11.-
2021-12-07 - 10 p.
- Published in : Eur. Phys. J. C 81 (2021) 1079
Fulltext: 2107.03025 - PDF; document - PDF;
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