3 citations · 9 across the 14 of their papers we have counts for
17 papers
Localized Neutrinos in Two Dark Dimensions
Waqas Ahmed, George K. Leontaris
We study neutrino masses in a six-dimensional framework with two compact dark dimensions. In the conventional flat-bulk realization, the sterile-neutrino zero mode is strongly volu…
The Case for Single-Version Concurrency Control in the Cloud
Lam-Duy Nguyen, Gabriel Haas, Muhammad El-Hindi +2
Multi-version concurrency control (MVCC) has been the dominant concurrency protocol in modern database management systems (DBMSs). However, cloud-native HTAP architectures shift ma…
Kaluza--Klein Dark-Photon Mediation of Inelastic Dark Matter at LUX-ZEPLIN
Waqas Ahmed, George K. Leontaris
We study a five-dimensional realization of endothermic dark matter motivated by the recent high-recoil LUX-ZEPLIN event. A pseudo-Dirac Standard-Model singlet fermion is localized…
A Dark-Dimension Origin of Geometric Inelastic Dark Matter: The LUX-ZEPLIN High-Recoil Event and Multi-Target Tests
Waqas Ahmed, George K. Leontaris
The extended nuclear-recoil analysis of LUX-ZEPLIN (LZ) has reported one event compatible with a recoil energy near keV, motivating endothermic dark-matter scenarios with sup…
Decoherence Effects on Primordial Black Holes and Scalar-Induced Gravitational Waves
Waqas Ahmed
Primordial black holes (PBHs) form when large primordial curvature perturbations re-enter the Hubble radius and exceed the classical collapse threshold. These perturbations origina…
Probing Two Dark Dimensions through Primordial Black Holes, Gravitational Waves, and Colliders
Waqas Ahmed, George K. Leontaris
We study primordial-black-hole (PBH) dark matter in the two-dark-dimensions (2DD) framework, a six-dimensional brane-world scenario with two compact extra dimensions and a fundamen…
Entanglement, Discord, and Residual Coherence in Scalar-Induced Gravitational Waves
Waqas Ahmed
Scalar-induced gravitational waves (SIGWs) are usually characterized by their power spectrum, although their quadratic scalar source also carries higher-order correlation informati…
Quantum Memory in Scalar-Induced Gravitational Waves
Waqas Ahmed
Scalar-induced gravitational waves are usually treated as a classical stochastic background sourced by phase-random curvature perturbations. We show that this description can miss…
Secondary Gravitational Wave Signatures from 5D Rotating Primordial Black Holes in the Dark Dimension
Waqas Ahmed, George K. Leontaris
We investigate five-dimensional rotating primordial black holes (PBHs) as dark matter candidates within the Dark Dimension (DD) scenario motivated by the Swampland Program. In this…
F-Term Hybrid Inflation with T-Model Kähler Geometry and Beyond
Waqas Ahmed, Constantinos Pallis, Mansoor Ur Rehman
We analyze F-term hybrid inflation (FHI) within various grand unified theories (GUTs) in the presence of a Kähler potential for the inflaton field which parameterizes the Kähler ma…
Radiatively Corrected Hybrid Inflation: Parameter Scans and Machine Learning with ACT and Future CMB Experiments
Waqas Ahmed, Saleh O. Allehabi, Mansoor Ur Rehman
We investigate a realistic non-supersymmetric hybrid inflation model incorporating right-handed neutrinos and assess its viability in light of recent cosmological observations. At…
GUT-Scale Smooth Hybrid Inflation with a Stabilized Modulus in Light of ACT and SPT Data
Waqas Ahmed, Constantinos Pallis, Mansoor Ur Rehman
We analyze a generalized framework of smooth F-term hybrid inflation (smFHI) consistent with gauge coupling unification within the Minimal Supersymmetric Standard Model (MSSM). The…
Revisiting Polynomial Hybrid Inflation: Planck and ACT Compatibility via Radiative Corrections
Waqas Ahmed, Saleh O. Allehabi, Mansoor Ur Rehman
We investigate the impact of one-loop radiative corrections in a non-supersymmetric model of hybrid inflation with a chaotic (polynomial-like) potential,, in…
Tribrid Inflation, Type II Leptogenesis, and Observable Gravitational Waves in
Waqas Ahmed, Saleh O. Allehabi, Farishta Israr +1
We present a concrete realization of tribrid inflation within the framework of the gauge group . In this model, inflation i…
Radiatively Corrected Starobinsky Inflation and Primordial Gravitational Waves in Light of ACT Observations
Waqas Ahmed, Mansoor Ur Rehman
Nonminimal coupling between the inflaton and the Ricci scalar plays a crucial role in shaping the predictions of single-field inflationary models. While a quartic potential with su…
Primordial Black Holes and Second-order Gravitational Waves in Axion-like Hybrid Inflation
Waqas Ahmed, Anish Ghoshal, Umer Zubair
We investigate the possibility that primordial black holes (PBHs) can be formed from large curvature perturbations generated during the waterfall phase transition in a hybrid infla…
Inflation, Proton Decay and Gravitational Waves from Metastable Strings in Model
Waqas Ahmed, Maria Mehmood, Mansoor Ur Rehman +1
We present a realistic supersymmetric -hybrid inflation model within the framework of gauge symmetry, wherein the symmetry breaking $SU(4)…