145 citations · 2.1k across the 96 of their papers we have counts for
9 papers · 1 filter
Loops rescue the no-boundary proposal
Martin Bojowald, Suddhasattwa Brahma
New and non-trivial properties of off-shell instantons in loop quantum cosmology show that dynamical signature change naturally cures recently observed problems in the semiclassica…
On the geometry of no-boundary instantons in loop quantum cosmology
Suddhasattwa Brahma, Dong-han Yeom
We study the geometry of Euclidean instantons in loop quantum cosmology (LQC) such as those relevant for the no-boundary proposal. Confining ourselves to the simplest case of a cos…
Small magnetic charges and monopoles in non-associative quantum mechanics
Martin Bojowald, Suddhasattwa Brahma, Umut Buyukcam +2
Weak magnetic monopoles with a continuum of charges less than the minimum implied by Dirac's quantization condition may be possible in non-associative quantum mechanics. If a weakl…
Avoiding the string swampland in single-field inflation: Excited initial states
Suddhasattwa Brahma, Md. Wali Hossain
One class of single-field inflationary models compatible with the recently-conjectured Swampland criteria would be those in which a Hubble slow-roll parameter is not t…
The no-boundary wave function for loop quantum cosmology
Suddhasattwa Brahma, Dong-han Yeom
Proposing smooth initial conditions is one of the most important tasks in quantum cosmology. On the other hand, the low-energy effective action, appearing in the semiclassical path…
Effective black-to-white hole bounces: The cost of surgery
Suddhasattwa Brahma, Dong-han Yeom
We investigate possible geometries allowing transitions from a black hole to a white hole spacetime, by placing a space-like thin shell between them. Such proposals have been advan…
On singularity-resolution in mimetic gravity
Suddhasattwa Brahma, Alexey Golovnev, Dong-han Yeom
Recently, it was shown that modified mimetic gravity, with a term, results in a singularity-free model of gravity, for both cosmological and black hole spacetimes [1,…
Effective line elements and black-hole models in canonical (loop) quantum gravity
Martin Bojowald, Suddhasattwa Brahma, Dong-han Yeom
Canonical quantization is often used to suggest new effects in quantum gravity, in the dynamics as well as the structure of space-time. Usually, possible phenomena are first seen i…
Constraining the loop quantum gravity parameter space from phenomenology
Suddhasattwa Brahma, Michele Ronco
Development of quantum gravity theories rarely takes inputs from experimental physics. In this letter, we take a small step towards correcting this by establishing a paradigm for i…