Zobrazeno 1 - 10
of 153
pro vyhledávání: '"Mirbabayi, Mehrdad"'
Autor:
Blum, Kfir, Mirbabayi, Mehrdad
We show that quantum fluctuations of an expanding phase transition bubble give rise to gravitational wave (GW) emission, even when considering a single bubble, without bubble collisions or plasma effects. The ratio of GW energy to the total bubble en
Externí odkaz:
http://arxiv.org/abs/2403.20164
Autor:
Gruzinov, Andrei, Mirbabayi, Mehrdad
It has been claimed that matter effects cause an asymmetry in the density of relic neutrinos versus antineutrinos near the surface of Earth, of order $O(G_F^{1/2})\sim 10^{-4}$, with the vertical extent $\sim 10$m. We argue that the effect is of orde
Externí odkaz:
http://arxiv.org/abs/2403.03152
Autor:
Mirbabayi, Mehrdad
The two-point correlation function of a massive field $\langle \chi(\tau)\chi(0)\rangle$, measured along an observer's worldline in de Sitter (dS), decays exponentially as $\tau \to \infty$. Meanwhile, every dS observer is surrounded by a horizon and
Externí odkaz:
http://arxiv.org/abs/2311.07724
Autor:
Mirbabayi, Mehrdad, Riccardi, Flavio
In a QFT on de Sitter background, one can study correlators between fields pushed to the future and past horizons of a comoving observer. This is a neat probe of the physics in the observer's causal diamond (known as the static patch). We use this ob
Externí odkaz:
http://arxiv.org/abs/2211.11672
Autor:
Amin, Mustafa A., Mirbabayi, Mehrdad
We argue that there is a lower bound of order $10^{-19}$ eV on dark matter mass if it is produced after inflation via a process with finite correlation length. We rely on non-detection of free-streaming suppression and white-noise enhancement of dens
Externí odkaz:
http://arxiv.org/abs/2211.09775
Autor:
Mirbabayi, Mehrdad
The interface between a big bubble of true AdS$_D$ vacuum expanding inside a false AdS$_D$ vacuum is a model of an inflating $D-1$ dimensional universe. It looks like an interesting setup to study fundamentals of inflation. A recent computation shows
Externí odkaz:
http://arxiv.org/abs/2210.14276
Autor:
Baumgart, Matthew, Bishara, Fady, Brauner, Tomas, Brod, Joachim, Cabass, Giovanni, Cohen, Timothy, Craig, Nathaniel, de Rham, Claudia, Draper, Patrick, Fitzpatrick, A. Liam, Gorbahn, Martin, Hartnoll, Sean, Ivanov, Mikhail, Kovtun, Pavel, Kundu, Sandipan, Lewandowski, Matthew, Liu, Hong, Lu, Xiaochuan, Mezei, Mark, Mirbabayi, Mehrdad, Moldanazarova, Ulserik, Nicolis, Alberto, Penco, Riccardo, Goldberger, Walter, Reece, Matthew, Rodd, Nicholas L., Rothstein, Ira, Shao, Shu-Heng, Shepherd, Will, Simonovic, Marko, Solon, Mikhail, Son, Dam Thanh, Szafron, Robert, Tolley, Andrew, Zhang, Zhengkang, Zhou, Shuang-Yong, Zupan, Jure
We summarize recent progress in the development, application, and understanding of effective field theories and highlight promising directions for future research. This Report is prepared as the TF02 "Effective Field Theory" topical group summary for
Externí odkaz:
http://arxiv.org/abs/2210.03199
Autor:
Mirbabayi, Mehrdad, Gruzinov, Andrei
Sphaleron heating has been recently proposed as a mechanism to realize warm inflation when inflaton is an axion coupled to pure Yang-Mills. As a result of heating, there is a friction coefficient $\gamma \propto T^3$ in the equation of motion for the
Externí odkaz:
http://arxiv.org/abs/2205.13227
Autor:
Cabass, Giovanni, Ivanov, Mikhail M., Lewandowski, Matthew, Mirbabayi, Mehrdad, Simonović, Marko
Small fluctuations around homogeneous and isotropic expanding backgrounds are the main object of study in cosmology. Their origin and evolution is sensitive to the physical processes that happen during inflation and in the late Universe. As such, the
Externí odkaz:
http://arxiv.org/abs/2203.08232
If a bulk gravitational path integral can be identified with an average of partition functions over an ensemble of boundary quantum theories, then a corresponding moment problem can be solved. We review existence and uniqueness criteria for the Stiel
Externí odkaz:
http://arxiv.org/abs/2103.12078