Zobrazeno 1 - 10
of 1 934
pro vyhledávání: '"Sheikh, A. M."'
In Adil et al. 2023, we reported an increasing trend in $S_8$ with effective redshift $z_{\textrm{eff}}$ based on $f \sigma_8(z)$ constraints over the redshift range $0 \lesssim z \lesssim 2$, and predicted that this trend would be observable in inde
Externí odkaz:
http://arxiv.org/abs/2410.23134
We revisit the canonical quantization of free bosonic closed string theory and observe that the physicality of states requires vanishing of the worldsheet Virasoro algebra generators sandwiched between any two physical states. This requirement yields
Externí odkaz:
http://arxiv.org/abs/2409.16152
It is well-established that black holes obey laws of thermodynamics, in particular, there is the seminal Iyer-Wald derivation of the first law of thermodynamics for any stationary black hole solution of a generic diffeomorphism invariant theory of gr
Externí odkaz:
http://arxiv.org/abs/2407.15994
We reconsider formulating $D$ dimensional gauge theories, with the focus on the case of gravity theories, in spacetimes with boundaries. We extend covariant phase space formalism to the cases in which boundaries are allowed to fluctuate. We analyze t
Externí odkaz:
http://arxiv.org/abs/2407.03259
Dark Energy Survey five-year supernovae data (DES 5YR SNe) in conjunction with Planck CMB and Dark Energy Spectroscopic Instrument (DESI) BAO data has detected a strong dynamical dark energy deviation from the $\Lambda$CDM model. Here, we shift the f
Externí odkaz:
http://arxiv.org/abs/2406.06389
The James Webb Space Telescope (JWST) is reporting unexpectedly massive high redshift galaxies that appear challenging from the $\Lambda$CDM perspective. Interpreted as a problem of cosmological origin, this necessitates Planck underestimating either
Externí odkaz:
http://arxiv.org/abs/2405.19953
We develop the framework that reveals the intrinsic conserved stress tensor and current associated with the null infinity of a three-dimensional ($3d$) asymptotically flat spacetime. These are, respectively, canonical conjugates of degenerate metric
Externí odkaz:
http://arxiv.org/abs/2405.00149
Autor:
Colgáin, Eoin Ó, Dainotti, Maria Giovanna, Capozziello, Salvatore, Pourojaghi, Saeed, Sheikh-Jabbari, M. M., Stojkovic, Dejan
We demonstrate that a $\sim 2 \sigma$ discrepancy with the Planck-$\Lambda$CDM cosmology in DESI Luminous Red Galaxy (LRG) data at $z_{\textrm{eff}} = 0.51$ translates into an unexpectedly large $\Omega_m$ value, $\Omega_m = 0.668^{+0.180}_{-0.169}$.
Externí odkaz:
http://arxiv.org/abs/2404.08633
We study 4 dimensional $(4d$) gravitational waves (GWs) with compact wavefronts, generalizing Robinson-Trautman (RT) solutions in Einstein gravity with an arbitrary cosmological constant. We construct the most general solution of the GWs in the prese
Externí odkaz:
http://arxiv.org/abs/2402.17658
Publikováno v:
Universe 2024, 10(8), 305
$\Lambda$CDM tensions are by definition model dependent; one sees anomalies through the prism of $\Lambda$CDM. Thus, progress towards tension resolution necessitates checking the consistency of the $\Lambda$CDM model to localise missing physics eithe
Externí odkaz:
http://arxiv.org/abs/2402.04767