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274 papers · 1 filter
Amplifying the Cosmological Collider with Ghost Spectators
Matheus Curado Ferreira, F. T. Falciano, Guilherme L. Pimentel
Ghost inflation is a well-known framework in which cosmological fluctuations can generate enhanced primordial non-Gaussianity, typically of the equilateral type. In its original fo…
Strongly Coupled Sectors in Inflation: Gapped Theories of Unparticles
Yikun Jiang, Guilherme L. Pimentel, Chen Yang
We consider a novel scenario for a strongly coupled spectator sector during inflation, that of a higher dimensional conformal field theory with large anomalous dimensions -- ``unpa…
Primordial Non-Gaussianity from a String-Inspired Cosmology
M. Meo
The interplay between string theory and early-universe cosmology offers promising avenues to explore high-energy regimes where the standard single-field slow-roll model may no long…
Aspects of strings without spacetime supersymmetry
Giorgio Leone, Salvatore Raucci
String theory relies on spacetime supersymmetry to guarantee the existence of stable vacua. In this review, we survey two features of non-supersymmetric strings that challenge both…
On the Asymptotic Nature of Cosmological Effective Theories
Carlos Duaso Pueyo, Harry Goodhew, Ciaran McCulloch +1
Much of our intuition about Effective Field Theories (EFTs) stems from their formulation in flat spacetime, yet EFTs have become indispensable tools in cosmology, where time-depend…
Black Hole Critical Collapse in Infinite Dimensions: Continuous Self-Similar Solutions
Craig R. Clark, Guilherme L. Pimentel
We investigate the dynamics of black hole critical collapse in the limit of a large number of spacetime dimensions, . In particular, we study the spherical gravitational collaps…