Zobrazeno 1 - 10
of 192
pro vyhledávání: '"Palma, Gonzalo A."'
Particle production in de Sitter spacetime arises from the exponential expansion of space, rendering the Bunch-Davies vacuum perceived as a particle-containing state by late-time observers. For states defined as eigenstates of both momentum and the H
Externí odkaz:
http://arxiv.org/abs/2410.13843
Correlation functions of light scalar fields in de Sitter spacetime, computed via standard perturbation theory, often exhibit secular growth characterized by time-dependent divergent terms in the form of powers of $\ln a(t)$, where $a(t)$ is the scal
Externí odkaz:
http://arxiv.org/abs/2406.07610
Autor:
Palma, Gonzalo A., Sypsas, Spyros
A long-standing problem within the study of cosmic inflation consists in fully reconciling the stochastic approach with perturbation theory. A complete connection between both formalisms has remained elusive even in the simple case of a single scalar
Externí odkaz:
http://arxiv.org/abs/2311.17644
Autor:
Palma, Gonzalo A., Sypsas, Spyros
Scalar fields interacting with the primordial curvature perturbation during inflation may communicate their statistics to the latter. This situation motivates the study of how the probability density function (PDF) of a light spectator field $\varphi
Externí odkaz:
http://arxiv.org/abs/2309.16474
Autor:
Green, Daniel, Ruderman, Joshua T., Safdi, Benjamin R., Shelton, Jessie, Achúcarro, Ana, Adshead, Peter, Akrami, Yashar, Baryakhtar, Masha, Baumann, Daniel, Berlin, Asher, Blinov, Nikita, Boddy, Kimberly K., Buschmann, Malte, Cabass, Giovanni, Caldwell, Robert, Castorina, Emanuele, Chen, Thomas Y., Chen, Xingang, Coulton, William, Croon, Djuna, Cui, Yanou, Curtin, David, Cyr-Racine, Francis-Yan, Dessert, Christopher, Dienes, Keith R., Draper, Patrick, Du, Peizhi, Ellis, Sebastian A. R., Essig, Rouven, Flauger, Raphael, Fong, Chee Sheng, Foster, Joshua W., Fumagalli, Jacopo, Harigaya, Keisuke, Horiuchi, Shunsaku, Ivanov, Mikhail M., Kahn, Yonatan, Knapen, Simon, Leane, Rebecca K., Lee, Hayden, Lentz, Erik W., Lewandowski, Matthew, Lisanti, Mariangela, Long, Andrew J., Loverde, Marilena, Maleknejad, Azadeh, McAllister, Liam, McDermott, Samuel D., McGehee, Robert, Meerburg, P. Daniel, Meyers, Joel, Dizgah, Azadeh Moradinezhad, Münchmeyer, Moritz, Outmezguine, Nadav Joseph, Pajer, Enrico, Palma, Gonzalo A., Parikh, Aditya, Park, Jong-Chul, Peter, Annika H. G., Pimentel, Guilherme L., Renaux-Petel, Sébastien, Rodd, Nicholas L., Shakya, Bibhushan, Shiu, Gary, Silverstein, Eva, Simonovic, Marko, Singh, Rajeev, Sleight, Charlotte, Takhistov, Volodymyr, Tanedo, Philip, Taronna, Massimo, Thomas, Brooks, Toro, Natalia, Tsai, Yu-Dai, Vitagliano, Edoardo, Vogelsberger, Mark, Wallisch, Benjamin, Wandelt, Benjamin D., Wechsler, Risa H., Weniger, Christoph, Wu, W. L. Kimmy, Xu, Weishuang Linda, Yamada, Masaki, Yu, Hai-Bo, Zhang, Zhengkang, Zhong, Yi-Ming, Zurek, Kathryn
We summarize progress made in theoretical astrophysics and cosmology over the past decade and areas of interest for the coming decade. This Report is prepared as the TF09 "Astrophysics and Cosmology" topical group summary for the Theory Frontier as p
Externí odkaz:
http://arxiv.org/abs/2209.06854
Autor:
Achúcarro, Ana, Biagetti, Matteo, Braglia, Matteo, Cabass, Giovanni, Caldwell, Robert, Castorina, Emanuele, Chen, Xingang, Coulton, William, Flauger, Raphael, Fumagalli, Jacopo, Ivanov, Mikhail M., Lee, Hayden, Maleknejad, Azadeh, Meerburg, P. Daniel, Dizgah, Azadeh Moradinezhad, Palma, Gonzalo A., Pimentel, Guilherme L., Renaux-Petel, Sébastien, Wallisch, Benjamin, Wandelt, Benjamin D., Witkowski, Lukas T., Wu, W. L. Kimmy
Cosmic inflation provides a window to the highest energy densities accessible in nature, far beyond those achievable in any realistic terrestrial experiment. Theoretical insights into the inflationary era and its observational probes may therefore sh
Externí odkaz:
http://arxiv.org/abs/2203.08128
It is becoming increasingly clear that large but rare fluctuations of the primordial curvature field, controlled by the tail of its probability distribution, could have dramatic effects on the current structure of the universe -- {\it e.g.} via primo
Externí odkaz:
http://arxiv.org/abs/2112.14712
Autor:
Fumagalli, Jacopo, Palma, Gonzalo A., Renaux-Petel, Sébastien, Sypsas, Spyros, Witkowski, Lukas T., Zenteno, Cristobal
Publikováno v:
JHEP 03 (2022) 196
We show that a scalar excited state with large occupation numbers during inflation leads to an enhancement of tensor modes and a characteristic pattern of order-one oscillations in the associated stochastic gravitational wave background (SGWB) source
Externí odkaz:
http://arxiv.org/abs/2111.14664
Autor:
Dahal, Sumit, Appel, John W., Datta, Rahul, Brewer, Michael K., Ali, Aamir, Bennett, Charles L., Bustos, Ricardo, Chan, Manwei, Chuss, David T., Cleary, Joseph, Couto, Jullianna D., Denis, Kevin L., Dünner, Rolando, Eimer, Joseph, Espinoza, Francisco, Essinger-Hileman, Thomas, Golec, Joseph E., Harrington, Kathleen, Helson, Kyle, Iuliano, Jeffrey, Karakla, John, Li, Yunyang, Marriage, Tobias A., McMahon, Jeffrey J., Miller, Nathan J., Novack, Sasha, Núñez, Carolina, Osumi, Keisuke, Padilla, Ivan L., Palma, Gonzalo A., Parker, Lucas, Petroff, Matthew A., Reeves, Rodrigo, Rhoades, Gary, Rostem, Karwan, Valle, Deniz A. N., Watts, Duncan J., Weiland, Janet L., Wollack, Edward J., Xu, Zhilei
Publikováno v:
The Astrophysical Journal, 926:33 (9pp), 2022 February 10
The Cosmology Large Angular Scale Surveyor (CLASS) observes the polarized cosmic microwave background (CMB) over the angular scales of 1$^\circ \lesssim \theta \leq$ 90$^\circ$ with the aim of characterizing primordial gravitational waves and cosmic
Externí odkaz:
http://arxiv.org/abs/2107.08022
Autor:
Bravo, Rafael, Palma, Gonzalo A.
We study the generation of local non-Gaussianity in models of canonical single field inflation when their backgrounds are either attractor or non-attractor. We show that the invariance of inflation under space-time diffeomorphisms can be exploited to
Externí odkaz:
http://arxiv.org/abs/2009.03369