359 citations · 1.8k across the 36 of their papers we have counts for
39 papers
de Sitter Spacetime: Geometry, Causal Structure, and Quantum Fields
Azadeh Maleknejad, Ethan Richardson
de~Sitter spacetime plays a central role in modern cosmology, providing an excellent approximation to both inflation and the present accelerated expansion. It also offers a particu…
Stochastic Schwinger Effect: de Sitter and beyond
Lucas Vicente García-Consuegra, Azadeh Maleknejad
We develop a stochastic formulation of the Schwinger effect in de Sitter spacetime using the Schwinger--Keldysh (in-in) formalism, tailored to particle production by non-stationary…
Squashed Pyramid Interferometer Network (SPIN): Direct Access to Chirality of Cosmological Gravitational Waves
Dmitri E. Kharzeev, Azadeh Maleknejad, Saba Shalamberidze
The cosmological gravitational wave background provides a powerful window on parity-violating physics at energies far beyond the reach of terrestrial experiments. However, any colo…
When Geometry Radiates Review: Gravitational Waves in Theory, Cosmology, and Observation
Azadeh Maleknejad
Gravitational waves provide a unique window into gravity, cosmology, and high-energy physics, enabling the exploration of fundamental phenomena across a wide range of scales. This…
The Stochastic Schwinger Effect
Lucas Vicente García-Consuegra, Azadeh Maleknejad
We formulate a stochastic generalisation of the Schwinger effect, extending pair production to statistically fluctuating gauge-field backgrounds. Our approach captures realistic fi…
QuGrav: Bringing gravitational waves to light with Qumodes
Dmitri E. Kharzeev, Azadeh Maleknejad, Saba Shalamberidze
We propose using qumodes, quantum bosonic modes, for detecting high-frequency gravitational waves via the inverse Gertsenshtein effect, where a gravitational wave resonantly conver…
Terrestrial Very-Long-Baseline Atom Interferometry: Summary of the Second Workshop
Adam Abdalla, Mahiro Abe, Sven Abend +307
This summary of the second Terrestrial Very-Long-Baseline Atom Interferometry (TVLBAI) Workshop provides a comprehensive overview of our meeting held in London in April 2024, build…
Gravitational ABJ Anomaly, Stochastic Matter Production, and Leptogenesis
Azadeh Maleknejad
Partially chiral stochastic gravitational wave backgrounds can arise from various processes in the early Universe. The gravitational ABJ anomaly links the chirality of the gravitat…
Weyl Fermion Creation by Cosmological Gravitational Wave Background at 1-loop
Azadeh Maleknejad, Joachim Kopp
Weyl fermions of spin minimally coupled to Einstein's gravity in 4 dimensions cannot be produced purely gravitationally in an expanding Universe at tree level. Surprising…
Gravitational Wave-Induced Freeze-In of Fermionic Dark Matter
Azadeh Maleknejad, Joachim Kopp
The minimal coupling of massless fermions to gravity does not allow for their gravitational production solely based on the expansion of the Universe. We argue that this changes in…
Terrestrial Very-Long-Baseline Atom Interferometry: Workshop Summary
Sven Abend, Baptiste Allard, Iván Alonso +250
This document presents a summary of the 2023 Terrestrial Very-Long-Baseline Atom Interferometry Workshop hosted by CERN. The workshop brought together experts from around the world…
Photon Chiral Memory Effect Stored on Celestial Sphere
Azadeh Maleknejad
This work introduces the chiral memory effect on the celestial sphere that measures the permanent change of electromagnetic fields by spin-dependent processes in bulk. Unlike the c…
Snowmass Theory Frontier: Astrophysics and Cosmology
Daniel Green, Joshua T. Ruderman, Benjamin R. Safdi +84
We summarize progress made in theoretical astrophysics and cosmology over the past decade and areas of interest for the coming decade. This Report is prepared as the TF09 "Astrophy…
Ultra-Light Pion and Baryon WIMPzilla Dark Matter
Azadeh Maleknejad, Evan McDonough
We consider a dark confining gauge theory with millicharged Ultra-Light Pions (ULP) and heavy baryons as dark matter candidates. The model simultaneously realizes the ultra-light (…
Cosmology with the Laser Interferometer Space Antenna
Pierre Auclair, David Bacon, Tessa Baker +177
The Laser Interferometer Space Antenna (LISA) has two scientific objectives of cosmological focus: to probe the expansion rate of the universe, and to understand stochastic gravita…
New Ideas in Baryogenesis: A Snowmass White Paper
Gilly Elor, Julia Harz, Seyda Ipek +21
The Standard Model of Particle Physics cannot explain the observed baryon asymmetry of the Universe. This observation is a clear sign of new physics beyond the Standard Model. Ther…
Inflation: Theory and Observations
Ana Achúcarro, Matteo Biagetti, Matteo Braglia +19
Cosmic inflation provides a window to the highest energy densities accessible in nature, far beyond those achievable in any realistic terrestrial experiment. Theoretical insights i…
Cold Atoms in Space: Community Workshop Summary and Proposed Road-Map
Ivan Alonso, Cristiano Alpigiani, Brett Altschul +246
We summarize the discussions at a virtual Community Workshop on Cold Atoms in Space concerning the status of cold atom technologies, the prospective scientific and societal opportu…
The isotropic attractor solution of axion-SU(2) inflation: Universal isotropization in Bianchi type-I geometry
Ira Wolfson, Azadeh Maleknejad, Tomoaki Murata +2
SU(2) gauge fields coupled to an axion field can acquire an isotropic background solution during inflation. We study homogeneous but anisotropic inflationary solutions in the prese…
Chiral Anomaly in SU(2)-Axion Inflation and the New Prediction for Particle Cosmology
Azadeh Maleknejad
Upon embedding the axion-inflation in the minimal left-right symmetric gauge extension of the SM with gauge group , [arXiv:2012.11516] prop…
SU(2) and its Axion in Cosmology: A common Origin for Inflation, Cold Sterile Neutrinos, and Baryogenesis
Azadeh Maleknejad
We introduce an axion-inflation model embedded in the Left-Right symmetric extension of the SM in which is coupled to the axion. This model merges three milestones of modern…
How attractive is the isotropic attractor solution of axion-SU(2) inflation?
Ira Wolfson, Azadeh Maleknejad, Eiichiro Komatsu
The key to the phenomenological success of inflation models with axion and SU(2) gauge fields is the isotropic background of the SU(2) field. Previous studies showed that this isot…
Dark Fermions and Spontaneous violation in -axion Inflation
Azadeh Maleknejad
Remarkably, if was spontaneously broken in the physics of inflation, fermions would notice and remember it. Based on that, we present a new (non-thermal) mechanism for generat…
Production and Backreaction of Fermions from Axion- Gauge Fields during Inflation
Leila Mirzagholi, Azadeh Maleknejad, Kaloian D. Lozanov
gauge fields and axions can have a stable, isotropic and homogeneous configuration during inflation. However, couplings to other matter species lead to particle production,…