10 citations · 23 across the 10 of their papers we have counts for
10 papers
Hidden quantum-informatic symmetries of quasi-de Sitter backgrounds
Suddhasattwa Brahma, Jaime Calderon-Figueroa, Xiancong Luo +1
We investigate how degeneracies in quasi-de Sitter backgrounds, in the sense of Wands' duality, are reflected in real-space quantum correlations of primordial perturbations. Using…
Stochastic instantons and the tail of the inflationary density perturbation
Jaime Calderón-Figueroa, David Seery
In the "stochastic formalism", the statistics of the inflationary density perturbation are obtained from the first passage distribution of a stochastic process. We develop a g…
Heterotic Warm Inflation
Arjun Berera, Heliudson Bernardo, Suddhasattwa Brahma +3
We propose a two-field model of warm inflation motivated by a heterotic string construction, involving an axion and a dilaton-like scalar field with non-trivial kinetic mixing. Gau…
Is the CMB revealing signs of pre-inflationary physics?
Suddhasattwa Brahma, Jaime Calderón-Figueroa
Given the latest observational constraints coming from the joint analyses of the Atacama Cosmology Telescope, the Planck Satellite and other missions, we point out the possibility…
The special case of slow-roll attractors in de Sitter: Non-Markovian noise and evolution of entanglement entropy
Suddhasattwa Brahma, Jaime Calderón-Figueroa, Xiancong Luo +1
We analyse the evolution of the reduced density matrix of inflationary perturbations, coupled to a heavy entropic field via the leading-order term within the Effective Field Theory…
Time-convolutionless cosmological master equations: Late-time resummations and decoherence for non-local kernels
Suddhasattwa Brahma, Jaime Calderón-Figueroa, Xiancong Luo
We revisit a simple toy model of two scalar fields in de Sitter space, playing the roles of "system" and "environment" degrees of freedom, which interact with each other. We show t…
Astrophysically sourced quantum coherent photonic signals
Arjun Berera, Jaime Calderón-Figueroa, Liang Chen +1
Stimulated emission is shown to be robust in stars. Through Bose enhancement this produces quantum states of aligned, monochromatic photons similar to a laser. The probability of c…
Momentum-space entanglement entropy in de Sitter
Suddhasattwa Brahma, Jaime Calderón-Figueroa, Moatasem Hassan +1
We study the momentum-space entanglement between the sub- and super-Hubble modes of a spectator scalar field, with a cubic interaction, in de Sitter space. Momentum-space en…
Viability of quantum communication across interstellar distances
Arjun Berera, Jaime Calderón-Figueroa
The possibility of achieving quantum communication using photons across interstellar distances is examined. For this, different factors are considered that could induce decoherence…
Quantum coherence of photons at cosmological distances
Arjun Berera, Suddhasattwa Brahma, Robert Brandenberger +2
We identify potential sources of decoherence for gauge bosons from a cosmological standpoint. Besides interactions with different species in the cosmological medium, we also…