Article
Physics, Particles & Fields
Hajime Otsuka, Yutaka Sakamura
Summary: This study investigates the time evolution of the background spacetime during the moduli stabilization process in the radiation dominated era. The findings suggest that when the mass scale of stabilization is larger than the compactification scale, the contribution of radiation to the total energy density remains significant for a longer time, resulting in slower expansion of the non-compact 3D space and continued perception of extra dimensions by radiation.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Borna Salehian, Hong-Yi Zhang, Mustafa A. Amin, David Kaiser, Mohammad Hossein Namjoo
Summary: This paper systematically derives the SP equations and relativistic corrections from the nonlinear and fully relativistic KGE equations in an expanding universe, providing insights into deviations and applicability beyond the SP system. The method presented simplifies the analysis of scalar dark matter dynamics and accurately captures deviations from the SP system towards the full KGE case, particularly in calculating the mass-radius relationship of solitons.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Ahmad Moursy
Summary: This paper presents a no-scale supergravity scenario of hybrid inflation with detailed investigation on inflation dynamics, emphasizing the connection between inflation, R-symmetry breaking, and GUT scales, as well as discussing parameters constrained by observables. Successful reheating is not influenced by R-symmetry breaking, but has interesting consequences. The study also explores reheating in the flipped GUT model and advocates for the Z(2) symmetry associated with it to avoid dangerous operators and allow decay channels for the inflaton to right-handed neutrinos (sneutrinos).
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Sergei M. Kuzenko, Jake C. Stirling
Summary: In this study, a new family of U(1) duality-invariant models is proposed for the coupling between nonlinear N = 1 supersymmetric electrodynamics and supergravity. This family includes the Cribiori-FarakosTournoy-van Proeyen supergravity-matter theory for spontaneously broken local supersymmetry and introduces a novel Fayet-Iliopoulos term without gauged R-symmetry.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Physics, Particles & Fields
Murat Gunaydin, Renata Kallosh, Andrei Linde, Yusuke Yamada
Summary: This study investigates M-theory compactification on twisted 7-tori with G(2)-holonomy, proposing superpotentials based on octonions and Fano planes to describe various vacuum states and inflation models. The research suggests that these models can predict benchmark targets for detecting B-modes in future cosmological observations.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Wilfried Buchmueller
Summary: The study investigates symmetry breaking and topological defects in a supersymmetric model with gauge group U(2), which predicts the formation of either monopoles and strings or dumbbells during two phases of hybrid inflation terminated by tachyonic preheating. In one case, a stochastic gravitational wave background generated by a metastable cosmic string network is predicted in the LIGO-Virgo band, extending possibly to the LISA frequency band and to nanohertz frequencies, while in the other case, no topological defects survive inflation and no stochastic gravitational wave background is produced.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Sergei M. Kuzenko, Kai Turner
Summary: The study investigates the massless and massive p-form models in curved space, revealing differences in their quantisation methods but demonstrating that an achievable quantisation can be obtained by introducing a mass term and Stueckelberg reformulation. Additionally, the analysis extends to the case of massive super p-forms coupled to background N=1 supergravity, showing interesting relationships between the effective actions of different multiplets.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Prateek Agrawal, Michael Nee
Summary: The study focuses on first order phase transitions in Randall-Sundrum models in the early universe related to confinement in large-N gauge theories. The proposed mechanism of avoided deconfinement aims to stabilize the theory and allows for a viable cosmology for theories with parametrically large N.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Wei Cheng, Yuan He, Jing-Wang Diao, Yu Pan, Jun Zeng, Jia-Wei Zhang
Summary: This paper investigates the testing of WIMP dark matter models by introducing an interaction term between dark energy and WIMP dark matter. The study reveals new insights on the evolution of parameters associated with dark matter freeze-out temperature and the magnification of dark matter relic density. The results suggest that with more precise cosmological observations, more stringent constraints can be placed on the WIMP dark matter models.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Guillermo Ballesteros, Sebastian Cespedes, Luca Santoni
Summary: This paper studies the mechanisms for generating a large power spectrum within the effective theory of single-field inflation, which is necessary for the formation of primordial black holes. The mechanisms considered include a transition into a ghost-inflation-like phase and scenarios where an exponentially growing mode is temporarily turned on. The enhancement in the power spectrum results from either a swift change in some effective coupling or a modification of the dispersion relation for the perturbations, while the background evolution remains unchanged and approximately de Sitter throughout inflation. The weakly broken galileon symmetry guarantees the robustness of the results.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Amjad Ashoorioon, Abasalt Rostami, Javad T. Firouzjaee
Summary: This paper presents a mechanism for enhancing the power spectrum during inflation, based on the observation that if the quartic coefficient in the dispersion relation is negative, the amplitude of the power spectrum is substantially enhanced. The mechanism must kick in at scales related to the mass of the PBHs one would like to produce, and it can be applied to produce solar mass PBHs or to contribute to the dark matter energy density.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Yusuke Yamada
Summary: In this study, we investigate scenarios where both supersymmetry and Lorentz symmetry are broken spontaneously in scalar fluid or vector condensation models. We find that the scalar fluid model faces several issues, but extending it to a vector condensation model avoids these problems while achieving soft SUSY breaking and accelerated expansion. The soft SUSY breaking in our simple setup is constrained to be less than O(100)TeV due to limitations on modification of gravity.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Ignatios Antoniadis, Anthony Guillen, Kyriakos Tamvakis
Summary: In this study, we investigate the ultraviolet behavior of Higgs inflation models above the apparent unitarity violation scale caused by the large non minimal coupling to gravity. By computing on-shell 4-point scattering amplitudes in the presence of a large inflaton background, we find that all tree-level amplitudes behave well at high energies below the inflaton background. This result holds true in both the metric and Palatini formulation, regardless of the frame used (Jordan or Einstein), and remains consistent even when an R-2 term is added to the action.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
I Antoniadis, C. Markou, F. Rondeau
Summary: This study examines the most general Kaluza-Klein compactification of a 5D graviton-dilaton system, investigating the Higgs mechanism for KK vectors and the resulting N = 1, D = 4 supersymmetric theory. The impact of background variation on vector compactification and supersymmetry breaking is explored in detail.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Sebastian Baum, Marcela Carena, Nausheen R. Shah, Carlos E. M. Wagner, Yikun Wang
Summary: Electroweak baryogenesis is an attractive mechanism for generating the baryon asymmetry of the Universe through a strong first order electroweak phase transition. Research suggests that nucleation becomes difficult when the barrier between local minima is too high or when the distance between minima is too large. Calculating nucleation probabilities can provide a more accurate determination of parameter space suitable for a strong first order electroweak phase transition than calculations based solely on critical temperatures.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Multidisciplinary Sciences
Kaushik Y. Bhagat, Baibhab Bose, Sayantan Choudhury, Satyaki Chowdhury, Rathindra N. Das, Saptarshhi G. Dastider, Nitin Gupta, Archana Maji, Gabriel D. Pasquino, Swaraj Paul
Summary: The concept of the out-of-time-ordered correlation (OTOC) function is introduced as a strong theoretical probe of quantum randomness, with a general class defined to capture quantum randomness phenomena better. An equivalent formalism of computation using a general time-independent Hamiltonian for integrable Supersymmetric quantum systems is demonstrated, requiring consideration of two new correlators. By analyzing the Harmonic Oscillator and one-dimensional potential well models within the framework of Supersymmetry, distinct parameter dependences and time scales compared to non-Supersymmetric quantum mechanics are found. The consistency of the prescribed formalism in the classical limit is established through phase space averaged versions of OTOCs.
Article
Physics, Particles & Fields
Hardik Bohra, Sayantan Choudhury, Prashali Chauhan, Purnima Narayan, Sudhakar Panda, Abinash Swain
Summary: This study investigates the connection between the curvature of background De Sitter space-time and the spectroscopic study of entanglement of two atoms, revealing the intricate interplay between them. It shows that the Resonant Casimir Polder Interaction (RCPI) in an Open Quantum System (OQS) depends on the de Sitter space-time curvature relevant to the temperature of the thermal bath, impacting the effective Hamiltonian of the system. The findings suggest a novel understanding of the Lamb shift behavior characterized by an inverse square power law and its relationship to the background geometry.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Physics, Multidisciplinary
Subhashish Banerjee, Sayantan Choudhury, Satyaki Chowdhury, Rathindra Nath Das, Nitin Gupta, Sudhakar Panda, Abinash Swain
Summary: The study focuses on the indirect detection of the Cosmological Constant using spectroscopic shifts in an open quantum system of weakly interacting spins in the de Sitter background. The results show that the spectroscopic shifts, caused by the Casimir Polder interaction, play a crucial role in predicting a very tiny value of the Cosmological Constant in the static patch of de Sitter space, consistent with the observed value from the Planck measurements of the cosmic microwave background (CMB) anisotropies.
Article
Multidisciplinary Sciences
Sayantan Choudhury, Sachin Panneer Selvam, K. Shirish
Summary: Computation of circuit complexity has recently gained attention in the physics community to understand chaotic features and random fluctuations in the quantum regime. This paper studies the relationship between circuit complexity and Morse theory in the framework of algebraic topology, focusing on supersymmetric quantum field theory and providing a technical proof of the universal connecting relation between quantum chaos and circuit complexity.
Article
Physics, Multidisciplinary
Kiran Adhikari, Sayantan Choudhury
Summary: In this paper, the Krylov complexity (K) of the de Sitter space is studied using the two mode squeezed state formalism in the presence of an effective sound speed. The explicit behavior of Krylov complexity (K) and Lancoz coefficients (bn) with respect to the conformal time scale and scale factor are obtained. The results suggest that the universe acts like a chaotic system during this period and that Krylov complexity (K) is related to the volume.
FORTSCHRITTE DER PHYSIK-PROGRESS OF PHYSICS
(2022)
Article
Physics, Multidisciplinary
Sayantan Choudhury, Sudhakar Panda, Nilesh Pandey, Abhishek Roy
Summary: This paper investigates the application of four-mode squeezed states in the cosmological context, focusing on the weakly coupled two scalar field model in the planar patch of the de Sitter space. By constructing the formalism of four-mode squeezed states and obtaining the coupled differential equations for time evolution, interesting dynamics with physical implications are observed and explored.
FORTSCHRITTE DER PHYSIK-PROGRESS OF PHYSICS
(2022)
Article
Physics, Multidisciplinary
Sayantan Choudhury
Summary: In this paper, we utilize the Lewis Riesenfeld invariant quantum operator method to find continuous eigenvalues of quantum mechanical wave functions. We derive analytical expressions for the cosmological geometric phase and compute it in different physical situations. The aim of this work is to investigate unknown quantum mechanical features of the primordial universe. The results are expressed in terms of cosmological observables, providing numerical constraints on the Pancharatnam Berry phase that are consistent with recent cosmological observations.
FORTSCHRITTE DER PHYSIK-PROGRESS OF PHYSICS
(2022)
Article
Physics, Multidisciplinary
Sayantan Choudhury, Arghya Mukherjee, Nilesh Pandey, Abhishek Roy
Summary: In this article, the physical implications of the causality constraint on Quantum Circuit Complexity (QCC) in the framework of Cosmological Effective Field Theory (COSMOEFT) are investigated using the two-mode squeezed quantum states. The relevant measures of the circuit complexity and their cosmological evolution for different values of the effective speed of sound are computed using two different approaches. The underlying relationship between the entanglement entropy and the circuit complexity is also established.
FORTSCHRITTE DER PHYSIK-PROGRESS OF PHYSICS
(2023)
Article
Multidisciplinary Sciences
Kiran Adhikari, Sayantan Choudhury, Sourabh Kumar, Saptarshi Mandal, Nilesh Pandey, Abhishek Roy, Soumya Sarkar, Partha Sarker, Saadat Salman Shariff
Summary: Motivated by recent studies, this research explores the computation of circuit complexity in Z2 Even Effective Field Theories (Z2 EEFTs) in the context of weakly interacting scalar field theory. The complexity of a massive free field theory with higher-order Wilsonian operators is calculated, considering both the simple case of two oscillators and the general case of N oscillators. Geometric approach and parameterization techniques are used to compute the complexity, taking into account the contribution of higher-order operators and the dependency on other parameters.
Article
Multidisciplinary Sciences
Sayantan Choudhury, Rakshit Mandish Gharat, Saptarshi Mandal, Nilesh Pandey
Summary: In this work, we investigate the impact of quantum quenching on the circuit complexity of quenched quantum field theory with weakly coupled quartic interactions. By using the invariant operator method under a perturbative framework, we compute the ground state of this system and provide analytical expressions for specific reference and target states. Additionally, we analytically compute the circuit complexity for the quenched and interacting field theory using a particular cost functional, and numerically estimate the circuit complexity with respect to the quench rate, dt, for two coupled oscillators. We also comment on the variation in circuit complexity for different coupling strengths, numbers of oscillators, and dimensions.
Article
Multidisciplinary Sciences
Kiran Adhikari, Sayantan Choudhury, Hardey N. Pandya, Rohan Srivastava
Summary: In this article, the physical implications of quantum circuit complexity are investigated using the squeezed state formalism of Primordial Gravitational Waves (PGW). Quantum information-theoretic concepts have played a crucial role in understanding quantum systems, even in fields such as high-energy physics and cosmology. The paper focuses on studying the quantum circuit complexity of PGW for various cosmological models and computes complexity measures using different methods. By comparing complexity and entanglement entropy, various features regarding the evolution dynamics of different cosmological models can be probed.
Article
Astronomy & Astrophysics
Sayantan Choudhury, Sudhakar Panda, M. Sami
Summary: In this study, we provide a detailed analysis of the formation of Primordial Black Holes (PBHs) during Slow Roll (SR) to Ultra Slow Roll (USR) sharp transitions in the framework of single-field inflation using an effective field theory (EFT) approach. Our results show that the prospects for PBH formation are severely limited in a single-field inflationary framework when renormalizing the power spectrum to one loop order in P(X, phi) theories. We also demonstrate that the addition of an SR regime after USR before the end of inflation does not significantly change our conclusions. Moreover, our findings strictly rule out the possibility of generating large masses of PBHs from all possible models of single field inflation (canonical and non-canonical).
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2023)
Article
Physics, Multidisciplinary
Sayantan Choudhury
Summary: In this work, the signatures of quantum entanglement in 3 + 1 dimensional global de Sitter space are studied by computing the entanglement negativity between two causally unrelated regions. It is found that the quantitative quantum information theoretic measure for entanglement negativity is consistent with the results obtained for entanglement entropy. The study also reveals the influence of axionic decay constant and supersymmetry breaking scale on the entanglement state. In addition, the possibility of a mini version of the multiverse within the current theoretical setup is discussed.
FORTSCHRITTE DER PHYSIK-PROGRESS OF PHYSICS
(2023)
Article
Astronomy & Astrophysics
Sayantan Choudhury, Rakshit Mandish Gharat, Saptarshi Mandal, Nilesh Pandey, Abhishek Roy, Partha Sarker
Summary: In this work, we investigate the effects of a quantum quench on the entanglement measures of a coupled oscillator system and provide analytical and numerical results. The study reveals that the entanglement measures exhibit different behaviors with respect to the coupling strength and time periods.
Article
Astronomy & Astrophysics
Sayantan Choudhury, K. Shirish
Summary: This paper examines the fate of wormholes in a model without quenched disorder and discusses their role in the factorization problem. It also explores the relationship between wormholes and topological defects, as well as the impact of wormholes on the spectral form factor.