All Outputs (59)

Stability and Vacuum Energy in Open String Models with Broken Supersymmetry (2019)
Journal Article
Abel, S., Dudas, E., Lewis, D., & Partouche, H. (2019). Stability and Vacuum Energy in Open String Models with Broken Supersymmetry. Journal of High Energy Physics, 2019(10), Article 226. https://doi.org/10.1007/jhep10%282019%29226

We construct type I string models with supersymmetry broken by compactifi- cation that are non-tachyonic and have exponentially small effective potential at one-loop. All open string moduli can be stabilized, while the closed string moduli remain mas... Read More about Stability and Vacuum Energy in Open String Models with Broken Supersymmetry.

Out-of-the-box baryogenesis during relaxation (2019)
Journal Article
Abel, S., Gupta, R., & Scholtz, J. (2019). Out-of-the-box baryogenesis during relaxation. Physical Review D, 100, Article 015034. https://doi.org/10.1103/physrevd.100.015034

We show that spontaneous baryogenesis occurs automatically in relaxion models if the reheating temperature is larger than the weak scale, provided the Standard Model fields are charged under the U(1) of which the relaxion is a pseudo-Nambu-Goldstone... Read More about Out-of-the-box baryogenesis during relaxation.

UV completion on the worldline (2019)
Journal Article
Abel, S., & Dondi, N. A. (2019). UV completion on the worldline. Journal of High Energy Physics, 2019(7), Article 90. https://doi.org/10.1007/jhep07%282019%29090

A framework for UV completing particle theories is proposed, based on the worldline formalism, which is equivalent to weighting all sums over histories with a propertime dependent measure that has a smallest proper-time. We deduce a criterion to avoi... Read More about UV completion on the worldline.

Dual renormalization group flows in 4D (2019)
Journal Article
Abel, S., Bajc, B., & Sannino, F. (2019). Dual renormalization group flows in 4D. Physical Review D, 99(6), Article 065001. https://doi.org/10.1103/physrevd.99.065001

We present a prescription for using the a central charge to determine the flow of a strongly coupled supersymmetric theory from its weakly coupled dual. The approach is based on the equivalence of the scale-dependent a parameter derived from the four... Read More about Dual renormalization group flows in 4D.

Complete asymptotically safe embedding of the standard model (2019)
Journal Article
Abel, S., Mølgaard, E., & Sannino, F. (2019). Complete asymptotically safe embedding of the standard model. Physical Review D, 99(3), Article 035030. https://doi.org/10.1103/physrevd.99.035030

We present and discuss the “Tetrad Model”, a large color/flavor embedding of the Standard model which has an interacting ultraviolet fixed point. It is shown that its extended-Pati-Salam symmetry is broken radiatively via the Coleman-Weinberg mechani... Read More about Complete asymptotically safe embedding of the standard model.

GUT precursors and entwined SUSY: The phenomenology of stable nonsupersymmetric strings (2018)
Journal Article
Abel, S., Dienes, K. R., & Mavroudi, E. (2018). GUT precursors and entwined SUSY: The phenomenology of stable nonsupersymmetric strings. Physical Review D, 97(12), Article 126017. https://doi.org/10.1103/physrevd.97.126017

Recent work has established a method of constructing nonsupersymmetric string models that are stable, with near-vanishing one-loop dilaton tadpoles and cosmological constants. This opens up the tantalizing possibility of realizing stable string model... Read More about GUT precursors and entwined SUSY: The phenomenology of stable nonsupersymmetric strings.

Exponential suppression of the cosmological constant in nonsupersymmetric string vacua at two loops and beyond (2017)
Journal Article
Abel, S., & Stewart, R. J. (2017). Exponential suppression of the cosmological constant in nonsupersymmetric string vacua at two loops and beyond. Physical Review D, 96(10), Article 106013. https://doi.org/10.1103/physrevd.96.106013

Two independent criteria are presented that together guarantee exponential suppression of the two-loop cosmological constant in nonsupersymmetric heterotic strings. They are derived by performing calculations in both the full string theory and in its... Read More about Exponential suppression of the cosmological constant in nonsupersymmetric string vacua at two loops and beyond.

Radiative symmetry breaking from interacting UV fixed points (2017)
Journal Article
Abel, S., & Sannino, F. (2017). Radiative symmetry breaking from interacting UV fixed points. Physical Review D, 96(5), Article 056028. https://doi.org/10.1103/physrevd.96.056028

It is shown that the addition of positive mass-squared terms to asymptotically safe gauge-Yukawa theories with perturbative UV fixed points leads to calculable radiative symmetry breaking in the IR. This phenomenon, and the multiplicative running of... Read More about Radiative symmetry breaking from interacting UV fixed points.

Framework for an asymptotically safe standard model via dynamical breaking (2017)
Journal Article
Abel, S., & Sannino, F. (2017). Framework for an asymptotically safe standard model via dynamical breaking. Physical Review D, 96(5), Article 055021. https://doi.org/10.1103/physrevd.96.055021

We present a consistent embedding of the matter and gauge content of the Standard Model into an underlying asymptotically safe theory that has a well-determined interacting UV fixed point in the large color/flavor limit. The scales of symmetry breaki... Read More about Framework for an asymptotically safe standard model via dynamical breaking.

Interpolations from supersymmetric to nonsupersymmetric strings and their properties (2017)
Journal Article
Aaronson, B., Abel, S., & Mavroudi, E. (2017). Interpolations from supersymmetric to nonsupersymmetric strings and their properties. Physical Review D, 95(10), Article 106001. https://doi.org/10.1103/physrevd.95.106001

A dynamical mechanism for large volumes with consistent couplings (2016)
Journal Article
Abel, S. (2016). A dynamical mechanism for large volumes with consistent couplings. Journal of High Energy Physics, 2016(11), Article 085. https://doi.org/10.1007/jhep11%282016%29085

A mechanism for addressing the “decompactification problem” is proposed, which consists of balancing the vacuum energy in Scherk-Schwarzed theories against contributions coming from non-perturbative physics. Universality of threshold corrections ensu... Read More about A dynamical mechanism for large volumes with consistent couplings.

Photo-production of a 750 GeV di-photon resonance mediated by Kaluza-Klein leptons in the loop (2016)
Journal Article
Abel, S., & Khoze, V. V. (2016). Photo-production of a 750 GeV di-photon resonance mediated by Kaluza-Klein leptons in the loop. Journal of High Energy Physics, 2016(5), Article 063. https://doi.org/10.1007/jhep05%282016%29063

We consider the phenomenology of a 750 GeV resonance X which can be produced at the LHC by only photon fusion and subsequently decay into di-photons. We propose that the spin-zero state X is coupled to a heavy lepton that lives in the bulk of a highe... Read More about Photo-production of a 750 GeV di-photon resonance mediated by Kaluza-Klein leptons in the loop.

Shift-Symmetries at Higher Order (2016)
Journal Article
Abel, S., & Stewart, R. (2016). Shift-Symmetries at Higher Order. Journal of High Energy Physics, 2016(2), Article 182. https://doi.org/10.1007/jhep02%282016%29182

The fate of shift-symmetries in effective string models is considered beyond tree-level. Such symmetries have been proposed in the past as a way to maintain a hierarchically small Higgs mass and also play a role in schemes of cosmological relaxation.... Read More about Shift-Symmetries at Higher Order.

Q-branes (2015)
Journal Article
Abel, S., & Kehagias, A. (2015). Q-branes. Journal of High Energy Physics, 2015(11), Article 096. https://doi.org/10.1007/jhep11%282015%29096

Non-topological solitons (Q-balls) are discussed in some stringy settings. Our main result is that the dielectric D-brane system of Myers admits non-abelian Q-ball solutions on their world-volume, in which N Dp-branes relax to the standard dielectric... Read More about Q-branes.

Towards a nonsupersymmetric string phenomenology (2015)
Journal Article
Abel, S., Dienes, K., & Mavroudi, E. (2015). Towards a nonsupersymmetric string phenomenology. Physical Review D, 91(12), Article 126014. https://doi.org/10.1103/physrevd.91.126014

Over the past three decades, considerable effort has been devoted to studying the rich and diverse phenomenologies of heterotic strings exhibiting spacetime supersymmetry. Unfortunately, during this same period, there has been relatively little work... Read More about Towards a nonsupersymmetric string phenomenology.

Genetic Algorithms and the Search for Viable String Vacua (2014)
Journal Article
Abel, S., & Rizos, J. (2014). Genetic Algorithms and the Search for Viable String Vacua. Journal of High Energy Physics, 2014(8), Article 10. https://doi.org/10.1007/jhep08%282014%29010

Genetic Algorithms are introduced as a search method for finding string vacua with viable phenomenological properties. It is shown, by testing them against a class of Free Fermionic models, that they are orders of magnitude more efficient than a rand... Read More about Genetic Algorithms and the Search for Viable String Vacua.

Natural supersymmetry and dynamical flavour with meta-stable vacua (2014)
Journal Article
Abel, S., & McGarrie, M. (2014). Natural supersymmetry and dynamical flavour with meta-stable vacua. Journal of High Energy Physics, 2014(7), Article 145. https://doi.org/10.1007/jhep07%282014%29145

We show how gauged flavour breaking and N = 1 supersymmetry breaking can be dynamically aligned to produce natural models. Supersymmetry is broken in a metastable vacuum, while a weakly gauged flavour symmetry is identified with an SU (3) F subgroup... Read More about Natural supersymmetry and dynamical flavour with meta-stable vacua.

Novel Higgs potentials from gauge mediation of exact scale breaking (2014)
Journal Article
Abel, S., & Mariotti, A. (2014). Novel Higgs potentials from gauge mediation of exact scale breaking. Physical Review D, 89(12), Article 125018. https://doi.org/10.1103/physrevd.89.125018

We present a gauge mediation principle for beyond standard model theories where exact UV scale invariance is broken in a hidden sector. The relevant configurations are those in which the standard model and a hidden sector emanate from a scale invaria... Read More about Novel Higgs potentials from gauge mediation of exact scale breaking.

Mapping Dirac gaugino masses (2013)
Journal Article
Abel, S., & Busbridge, D. (2013). Mapping Dirac gaugino masses. Journal of High Energy Physics, 2013(11), Article 098. https://doi.org/10.1007/jhep11%282013%29098

We investigate the mapping of Dirac gaugino masses through regions of strong coupling, focussing on SQCD with an adjoint. These models have a well-known Kutasov duality, under which a weakly coupled electric UV description can flow to a different wea... Read More about Mapping Dirac gaugino masses.

Seiberg Duality versus Hidden Local Symmetry (2012)
Journal Article
Abel, S., & Barnard, J. (2012). Seiberg Duality versus Hidden Local Symmetry. Journal of High Energy Physics, 2012(5), Article 44. https://doi.org/10.1007/jhep05%282012%29044

It is widely believed that the emergent magnetic gauge symmetry of SQCD is analogous to a hidden local symmetry (HLS). We explore this idea in detail, deriving the entire (spontaneously broken) magnetic theory by applying the HLS formalism to spontan... Read More about Seiberg Duality versus Hidden Local Symmetry.