14 papers
Tetra-quadric CY Threefold and Assisted Fibre Inflation
Swagata Bhattacharyya, George K. Leontaris, Pramod Shukla
In the context of type IIB superstring compactification, we demonstrate the assisted fibre inflation proposal for a four-field model realized using the orientifold of a tetra-quadr…
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…
Micron-sized Extra Dimensions and Primordial Black Holes: Charged, Rotating, and Memory Burdened
George K. Leontaris, George Prampromis
We explore the possibility of explaining dark matter through six-dimensional (6D) primordial black holes (PBHs) in a theory with two extra dimensions. Interestingly, in this scenar…
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…
Towards Systematics of Calabi-Yau Landscape for String Cosmology
George K. Leontaris, Pramod Shukla
In this review, we discuss the relevance and impact of studying Calabi-Yau threefolds in the context of global model building in string phenomenology. First, taking a phenomenologi…
On Global Embedding of Assisted Fibre Inflation
George K. Leontaris, Pramod Shukla
Fibre inflation is one of the most attractive models realized in the type IIB orientifold compactification. It is embedded in the framework of L(arge) V(olume) S(cenarios) using a…