Zobrazeno 1 - 10
of 108
pro vyhledávání: '"Verner, Sarunas"'
Autor:
Verner, Sarunas
We investigate the gravitational production of superheavy scalar fields with nonminimal coupling during and after inflation. We derive analytical approximations using the mode function solution in a de Sitter background and also apply the steepest de
Externí odkaz:
http://arxiv.org/abs/2408.11889
Autor:
Choi, Gongjun, Garcia, Marcos A. G., Ke, Wenqi, Mambrini, Yann, Olive, Keith A., Verner, Sarunas
We study the effects on particle production of a Planck-suppressed coupling between the inflaton and a scalar dark matter candidate, $\chi$. In the absence of this coupling, the dominant source for the relic density of $\chi$ is the long wavelength m
Externí odkaz:
http://arxiv.org/abs/2406.06696
Autor:
Dror, Jeff A., Verner, Sarunas
Ultralight dark matter induces time-dependent perturbations in the spacetime metric, enabling its gravitational direct detection. In this work, we propose using astrometry to detect dark matter. After reviewing the calculation of the metric in the pr
Externí odkaz:
http://arxiv.org/abs/2406.03526
We investigate the gravitational production of a scalar field $\chi$ with a mass exceeding the Hubble scale during inflation $m_\chi \gtrsim H_I$, employing both analytical and numerical approaches. We demonstrate that the steepest descent method eff
Externí odkaz:
http://arxiv.org/abs/2405.13883
We consider the decay of the inflaton in Starobinsky-like models arising from either an $R+R^2$ theory of gravity or $N=1$ no-scale supergravity models. If Standard Model matter is simply introduced to the $R + R^2$ theory, the inflaton (which appear
Externí odkaz:
http://arxiv.org/abs/2404.14545
Theoretical physicists describe nature by i) building a theory model and ii) determining the model parameters. The latter step involves the dual aspect of both fitting to the existing experimental data and satisfying abstract criteria like beauty, na
Externí odkaz:
http://arxiv.org/abs/2401.11513
The discovery process of building new theoretical physics models involves the dual aspect of both fitting to the existing experimental data and satisfying abstract theorists' criteria like beauty, naturalness, etc. We design loss functions for perfor
Externí odkaz:
http://arxiv.org/abs/2311.00087
We compute the density of a spin-$\frac32$ particle, the raritron, produced at the end of inflation due to gravitational interactions. We consider a background inflaton condensate as the source of this production, mediated by the exchange of a gravit
Externí odkaz:
http://arxiv.org/abs/2309.15146
Autor:
Ema, Yohei, Verner, Sarunas
We study the cosmological collider signatures in the Higgs-$R^2$ inflation model. We consider two distinct types of signals: one originating from the inflaton coupling to Standard Model fermions and gauge bosons, and another arising from the isocurva
Externí odkaz:
http://arxiv.org/abs/2309.10841
Autor:
Forestano, Roy T., Matchev, Konstantin T., Matcheva, Katia, Roman, Alexander, Unlu, Eyup B., Verner, Sarunas
Deep learning was recently successfully used in deriving symmetry transformations that preserve important physics quantities. Being completely agnostic, these techniques postpone the identification of the discovered symmetries to a later stage. In th
Externí odkaz:
http://arxiv.org/abs/2309.07860