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Radiative Corrections and Reheating in Supergravity Models of Inflation
John Ellis, Tony Gherghetta, Kunio Kaneta +2
We consider the effects of radiative corrections in Starobinsky-like models of inflation, concentrating on models of inflation formulated in N=1 no-scale supergravity. Inflaton cou…
Suppressing Extra-Dimensional Axion Isocurvature Dynamically
Gongjun Choi, Tony Gherghetta
Extra-dimensional QCD axion is well motivated by string compactifications and enjoys enhanced protection against quality-violating effects. If present during inflation, however, it…
Radiative Corrections in Supergravity Models of Inflation
John Ellis, Tony Gherghetta, Kunio Kaneta +2
Supergravity provides the natural supersymmetric framework for early universe cosmology. A broad class of inflationary models in no-scale supergravity yields tree-level predictions…
An Extra-Dimensional Axion in a 5D Warped Orbifold GUT
Gongjun Choi, Tony Gherghetta
We study the QCD axion arising from the 5th component of a bulk gauge field in a five-dimensional warped grand unified theory, and determine the viable range of the axion de…
Effects of Radiative Corrections on Starobinsky Inflation
John Ellis, Tony Gherghetta, Kunio Kaneta +2
We analyze radiative corrections to the Starobinsky model of inflation arising from self-interactions of the inflaton, and from its Yukawa couplings, , to matter fermions, and d…
Heavy QCD Axions at High-Energy Muon Colliders
Ravneet Bedi, Tony Gherghetta, Soubhik Kumar +2
We study the physics potential of heavy QCD axions at high-energy muon colliders. Unlike typical axion-like particles, heavy QCD axions solve the strong CP problem with phenomenolo…
A High-Quality Composite Pati-Salam Axion
Tony Gherghetta, Hitoshi Murayama, Pablo Quílez
We present a composite QCD axion model where the Peccei--Quinn (PQ) symmetry emerges as a high-quality, accidental symmetry. The axion potential is only modified by eight-fermion,…
Holographic phase transitions via thermally-assisted tunneling
Tony Gherghetta, Arpon Paul, Andrey Shkerin
We construct the thermal bounce solution in holographic models that describes first-order phase transitions between the deconfined and confined phases in strongly-coupled gauge the…
Effective interactions and on-shell recursion relation for massive spin 3/2
Tony Gherghetta, Wenqi Ke
We use on-shell methods to compute all three-point interactions of massive spin-3/2 particles involving a graviton and particles of spin . By employing the massive spinor-h…
Solving the strong CP problem with massless grand-color quarks
Ravneet Bedi, Tony Gherghetta, Keisuke Harigaya
We propose a solution to the strong CP problem that specifically relies on massless quarks and has no light axion. The QCD color group is embedded into a larger, simple g…
A Light QCD Axion with Hilltop Misalignment
Raymond T. Co, Tony Gherghetta, Zhen Liu +1
We study the cosmological evolution of a light QCD axion and identify the parameter space to obtain the correct relic dark matter abundance. The axion potential is flattened at the…
Small instanton-induced flavor invariants and the axion potential
Ravneet Bedi, Tony Gherghetta, Christophe Grojean +3
Small instantons which increase the axion mass due to an appropriate modification of QCD at a UV scale , can also enhance the effect of CP-violating operators to shift…
A Common Origin for the QCD Axion and Sterile Neutrinos from Strong Dynamics
Peter Cox, Tony Gherghetta, Arpon Paul
We identify the QCD axion and right-handed (sterile) neutrinos as bound states of an chiral gauge theory with Peccei-Quinn (PQ) symmetry arising as a global symmetry of the…
Probing the Local Dark Matter Halo with Neutrino Oscillations
Tony Gherghetta, Andrey Shkerin
Dark matter particles can form halos gravitationally bound to massive astrophysical objects. The Earth could have such a halo where depending on the particle mass, the halo either…
Report of the Topical Group on Physics Beyond the Standard Model at Energy Frontier for Snowmass 2021
Tulika Bose, Antonio Boveia, Caterina Doglioni +318
This is the Snowmass2021 Energy Frontier (EF) Beyond the Standard Model (BSM) report. It combines the EF topical group reports of EF08 (Model-specific explorations), EF09 (More gen…
Axiogenesis with a Heavy QCD Axion
Raymond T. Co, Tony Gherghetta, Keisuke Harigaya
We demonstrate that the observed cosmological excess of matter over antimatter may originate from a heavy QCD axion that solves the strong CP problem but has a mass much larger tha…
Enhanced EDMs from Small Instantons
Ravneet S. Bedi, Tony Gherghetta, Maxim Pospelov
We show that models in which the strong problem is solved by introducing an axion field with a mass enhanced by non-QCD UV dynamics at a scale exhibit enhanced se…
Light Sterile Neutrinos and a High-Quality Axion from a Holographic Peccei-Quinn Mechanism
Peter Cox, Tony Gherghetta, Minh D. Nguyen
We present a 5D axion-neutrino model that explains the Standard Model fermion mass hierarchy and flavor structure, while simultaneously generating a high-quality axion. The axion a…
Flavoured Warped Axion
Quentin Bonnefoy, Peter Cox, Emilian Dudas +2
We consider a 5D extension of the DFSZ axion model that addresses both the axion quality and fermion mass hierarchy problems, and predicts flavour-dependent, off-diagonal axion-fer…
A Composite Higgs with a Heavy Composite Axion
Tony Gherghetta, Minh D. Nguyen
We consider the strong dynamics associated with a composite Higgs model that simultaneously produces dynamical axions and solves the strong CP problem. The strong dynamics arises f…
The Axion Mass from 5D Small Instantons
Tony Gherghetta, Valentin V. Khoze, Alex Pomarol +1
We calculate a new contribution to the axion mass that arises from gluons propagating in a 5th dimension at high energies. By uplifting the 4D instanton solution to five dimensions…
Partially Composite Dynamical Dark Matter
Yusuf Buyukdag, Keith R. Dienes, Tony Gherghetta +1
In this paper, we consider a novel realization of the Dynamical Dark Matter (DDM) framework in which the ensemble of particles which collectively constitute the dark matter are the…
A Holographic Perspective on the Axion Quality Problem
Peter Cox, Tony Gherghetta, Minh D. Nguyen
The axion provides a compelling solution to the strong CP problem as well as a candidate for the dark matter of the universe. However, the axion solution relies on the spontaneous…
The Price of Tiny Kinetic Mixing
Tony Gherghetta, Joern Kersten, Keith Olive +1
We consider both "bottom-up" and "top-down" approaches to the origin of gauge kinetic mixing. We focus on the possibilities for obtaining kinetic mixings which are consistent w…