Zobrazeno 1 - 10
of 156
pro vyhledávání: '"BISWAS, TIRTHABIR"'
Theoretical neuroscientists often try to understand how the structure of a neural network relates to its function by focusing on structural features that would either follow from optimization or occur consistently across possible implementations. Bot
Externí odkaz:
http://arxiv.org/abs/2310.20309
Publikováno v:
Physical Review Research 4, 023255, 2022
Neural computation in biological and artificial networks relies on the nonlinear summation of many inputs. The structural connectivity matrix of synaptic weights between neurons is a critical determinant of overall network function, but quantitative
Externí odkaz:
http://arxiv.org/abs/2010.09660
Publikováno v:
Phys. Rev. D 95, 043533 (2017)
In this paper we provide the criteria for any generally covariant, parity preserving, and torsion free theory of gravity to possess a stable de Sitter (dS) or anti-de Sitter (AdS) background. By stability we mean the absence of tachyonic or ghost-lik
Externí odkaz:
http://arxiv.org/abs/1606.01250
In this article we will construct the most general torsion-free parity-invariant covariant theory of gravity that is free from ghost-like and tachyonic nstabilities around constant curvature space-times in four dimensions. Specifically, this includes
Externí odkaz:
http://arxiv.org/abs/1602.08475
Publikováno v:
Phys. Rev. D 93, 063505 (2016)
Being able to reliably track perturbations across bounces and turnarounds in cyclic and bouncing cosmology lies at the heart of being able to compare the predictions of these models with the Cosmic Microwave Background observations. This has been a c
Externí odkaz:
http://arxiv.org/abs/1502.05875
Autor:
Biswas, Tirthabir, Talaganis, Spyridon
Publikováno v:
Mod. Phys. Lett. A, Vol. 30, Nos. 3 & 4 (2015) 1540009
In String Theory there often appears a rather interesting class of higher derivative theories containing an infinite set of derivatives in the form of an exponential. These theories may provide a way to tame ultraviolet divergences without introducin
Externí odkaz:
http://arxiv.org/abs/1412.4256
Publikováno v:
Class. Quant. Grav. 32 (2015) no. 21, 215017
In this paper we will consider quantum aspects of a non-local, infinite-derivative scalar field theory - a $\it toy \, model$ depiction of a covariant infinite-derivative, non-local extension of Einstein's general relativity which has previously been
Externí odkaz:
http://arxiv.org/abs/1412.3467
Autor:
Biswas, Tirthabir, Okada, Nobuchika
Publikováno v:
Nucl.Phys. B898 (2015) 113-131
We take a few steps towards constructing a string-inspired nonlocal extension of the Standard Model. We start by illustrating how quantum loop calculations can be performed in nonlocal scalar field theory. In particular, we show the potential to addr
Externí odkaz:
http://arxiv.org/abs/1407.3331
Atick-Witten Hagedorn Conjecture, near scale-invariant matter and blue-tilted gravity power spectrum
We will provide an interesting new mechanism to generate almost scale invariant seed density perturbations with a red spectrum, while keeping the gravitational wave spectrum blue-tilted in a stringy thermal contracting phase at temperatures beyond th
Externí odkaz:
http://arxiv.org/abs/1403.7163
In this paper we study the most general covariant action of gravity up to terms that are quadratic in curvature. In particular this includes non-local, infinite derivative theories of gravity which are ghost-free and exhibit asymptotic freedom in the
Externí odkaz:
http://arxiv.org/abs/1308.2319