145 citations · 2.1k across the 96 of their papers we have counts for
10 papers · 1 filter
de Sitter Excited State in Heterotic E_8 x E_8 Theory
Suddhasattwa Brahma, Keshav Dasgupta, Bohdan Kulinich +3
We devise a novel duality sequence to study late-time cosmology in the heterotic E_8 x E_8 setup of Horava and Witten with dynamical walls that are moving towards each other. Surpr…
Lessons for loop quantum gravity from emergent modified gravity
Idrus Husin Belfaqih, Martin Bojowald, Suddhasattwa Brahma +1
Most of the potential physical effects of loop quantum gravity have been derived in effective models that modify the constraints of canonical general relativity in specific forms.…
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…
Collective field theory of gauged multi-matrix models: Integrating out off-diagonal strings
Suddhasattwa Brahma, Robert Brandenberger, Keshav Dasgupta +2
We study a two-matrix toy model with a BFSS-like interaction term using the collective field formalism. The main technical simplification is obtained by gauge-fixing first, and int…
Benchmarking quantum chaos from geometric complexity
Arpan Bhattacharyya, Suddhasattwa Brahma, Satyaki Chowdhury +1
Recent studies have shown that there is a strong interplay between quantum complexity and quantum chaos. In this work, we consider a new method to study geometric complexity for in…
Glauber-Sudarshan States, Wave Functional of the Universe and the Wheeler-De Witt equation
Suddhasattwa Brahma, Keshav Dasgupta, Fangyi Guo +1
One of the pertinent question in the analysis of de Sitter as an excited state is what happens to the Glauber-Sudarshan states that are off-shell, i.e. the states that do not satis…
Finite complexity of the de Sitter vacuum
Suddhasattwa Brahma, Lucas Hackl, Moatsem Hassan +1
The ER=EPR conjecture states that quantum entanglement between boundary degrees of freedom leads to the emergence of bulk spacetime itself. Although this has been tested extensivel…
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…
Black holes in effective loop quantum gravity: Covariant holonomy modifications
Idrus Husin Belfaqih, Martin Bojowald, Suddhasattwa Brahma +1
Emergent modified gravity provides a covariant, effective framework for obtaining spherically symmetric black hole solutions in models of loop quantum gravity with scale-dependent…
The Early Universe as an Open Quantum System: Complexity and Decoherence
Arpan Bhattacharyya, Suddhasattwa Brahma, S. Shajidul Haque +2
In this work, we extend previous results, demonstrating how complexity in an open quantum system can identify decoherence between two fields, even in the presence of an acceleratin…