We focus on the inflationary predictions of $beta$-exponential potential models, in which the inflaton is a representation of the field delineating the size of extra-dimension. Since it offers a well-motivated starting point for the study of physics at very high energies, we incorporate an $R^2$ term in the Palatini gravity. In addition, afterward the inflation, the inflaton oscillates about the minimum of the inflation potential, and reheats the universe. This occurs during the reheating phase, at which the inflaton decays into the standard model particles, which fill the universe. We extend our examination by considering the reheating effects on inflationary observables by employing the different scenarios of the reheat temperature. Supposing the standard thermal history after inflation, we display the inflationary predictions, $n_s, r, mathrm{d}n_s/mathrm{d}ln k$ of $beta$-exponential potential with minimal coupling in Palatini $R^2$ gravity. Also, different kinds of constraints from a variety of observations, such as BICEP/Keck, Planck 2018, as well as future possible detectable sensitivities that might be reached by CMB experiments: CMB-S4 and LiteBIRD are taken into account in this work. We indicate that our results are consistent with both the latest data and the future sensitivity forecasts of LiteBIRD/Planck and CMB-S4. Finally, the results in this study highlight the viability of our model even in the case of the existence of more stringent constraints expected from future achievable confidence level limits.
{"title":"Minimally coupled $β$-exponential inflation with an $R^2$ term in the Palatini formulation","authors":"Nilay Bostan, Rafid H. Dejrah","doi":"arxiv-2409.10398","DOIUrl":"https://doi.org/arxiv-2409.10398","url":null,"abstract":"We focus on the inflationary predictions of $beta$-exponential potential\u0000models, in which the inflaton is a representation of the field delineating the\u0000size of extra-dimension. Since it offers a well-motivated starting point for\u0000the study of physics at very high energies, we incorporate an $R^2$ term in the\u0000Palatini gravity. In addition, afterward the inflation, the inflaton oscillates\u0000about the minimum of the inflation potential, and reheats the universe. This\u0000occurs during the reheating phase, at which the inflaton decays into the\u0000standard model particles, which fill the universe. We extend our examination by\u0000considering the reheating effects on inflationary observables by employing the\u0000different scenarios of the reheat temperature. Supposing the standard thermal\u0000history after inflation, we display the inflationary predictions, $n_s, r,\u0000mathrm{d}n_s/mathrm{d}ln k$ of $beta$-exponential potential with minimal\u0000coupling in Palatini $R^2$ gravity. Also, different kinds of constraints from a\u0000variety of observations, such as BICEP/Keck, Planck 2018, as well as future\u0000possible detectable sensitivities that might be reached by CMB experiments:\u0000CMB-S4 and LiteBIRD are taken into account in this work. We indicate that our\u0000results are consistent with both the latest data and the future sensitivity\u0000forecasts of LiteBIRD/Planck and CMB-S4. Finally, the results in this study\u0000highlight the viability of our model even in the case of the existence of more\u0000stringent constraints expected from future achievable confidence level limits.","PeriodicalId":501067,"journal":{"name":"arXiv - PHYS - High Energy Physics - Phenomenology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142258927","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The subtitle of my talk is ``The quest for understanding the origin of neutrino masses''. After reviewing why the discovery of neutrino masses is also the discovery of New Physics, the substance of the talk details mechanisms for generating Majorana neutrino masses and implications for experimental searches and/or cosmology. I review high-scale seesaw, low-scale seesaw and radiative mechanisms, asking at every turn how testable the scenario is. While it is clear that determining the origin of neutrino masses -- knowing what Lagrangian to put into textbooks -- is a distant and ambitious goal, I end with experimental advances that we can reasonably hope for that would constitute progress.
{"title":"Neutrino theory: open questions and future opportunities","authors":"Raymond R. Volkas","doi":"arxiv-2409.09992","DOIUrl":"https://doi.org/arxiv-2409.09992","url":null,"abstract":"The subtitle of my talk is ``The quest for understanding the origin of\u0000neutrino masses''. After reviewing why the discovery of neutrino masses is also\u0000the discovery of New Physics, the substance of the talk details mechanisms for\u0000generating Majorana neutrino masses and implications for experimental searches\u0000and/or cosmology. I review high-scale seesaw, low-scale seesaw and radiative\u0000mechanisms, asking at every turn how testable the scenario is. While it is\u0000clear that determining the origin of neutrino masses -- knowing what Lagrangian\u0000to put into textbooks -- is a distant and ambitious goal, I end with\u0000experimental advances that we can reasonably hope for that would constitute\u0000progress.","PeriodicalId":501067,"journal":{"name":"arXiv - PHYS - High Energy Physics - Phenomenology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142258983","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
We explore the potential primordial connection between the black hole merger events detected by LIGO and the nano-Hz stochastic gravitational wave background observed by pulsar timing arrays. We propose an innovative mechanism for the formation of primordial black holes, suggesting that the Poisson fluctuations within the domain wall network can give rise to horizon-sized overdense regions. Our results indicate a plausible common origin for gravitational wave observations in two different frequency bands, potentially linked to the annihilation of the domain wall network at the QCD scale, while accounting for the accretion effects on primordial black holes. Furthermore, we demonstrate that the bias potential induced by the QCD instanton effect may naturally facilitate the annihilation of the domain wall network during the QCD phase transition. Additionally, our scenario can yield the correct axion dark matter relic abundance, particularly if realized within the clockwork axion framework.
{"title":"A Common Origin for Nano-Hz Gravitational Wave Background and Black Hole Merger Events","authors":"Bo-Qiang Lu, Cheng-Wei Chiang, Tianjun Li","doi":"arxiv-2409.10251","DOIUrl":"https://doi.org/arxiv-2409.10251","url":null,"abstract":"We explore the potential primordial connection between the black hole merger\u0000events detected by LIGO and the nano-Hz stochastic gravitational wave\u0000background observed by pulsar timing arrays. We propose an innovative mechanism\u0000for the formation of primordial black holes, suggesting that the Poisson\u0000fluctuations within the domain wall network can give rise to horizon-sized\u0000overdense regions. Our results indicate a plausible common origin for\u0000gravitational wave observations in two different frequency bands, potentially\u0000linked to the annihilation of the domain wall network at the QCD scale, while\u0000accounting for the accretion effects on primordial black holes. Furthermore, we\u0000demonstrate that the bias potential induced by the QCD instanton effect may\u0000naturally facilitate the annihilation of the domain wall network during the QCD\u0000phase transition. Additionally, our scenario can yield the correct axion dark\u0000matter relic abundance, particularly if realized within the clockwork axion\u0000framework.","PeriodicalId":501067,"journal":{"name":"arXiv - PHYS - High Energy Physics - Phenomenology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142258934","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ayush Hazarika, Premachand Mahapatra, Subhadip Sau
The possible existence of axions in the universe introduces the intriguing possibility of photon-axion conversion in strong magnetic fields, particularly near compact objects like supermassive black holes or even naked singularity. In this study, we investigate the conversion of photons into axions in the vicinity of a Janis-Newman-Winicour (JNW) spacetime, a well-known naked singularity solution. Our analysis reveals that photons can efficiently convert into axions with masses less than $100 rm neV$. We calculate the conversion probability and find that it is significantly influenced by the characteristic parameter of the JNW spacetime. The potential observational signatures of this conversion, would be the dimming of photon ring in the X-ray and gamma-ray spectrum. Our findings suggest that compact objects like M87* could be prime candidates for detecting photon-axion conversion effects, provided future advances in high-resolution observations.
{"title":"Photon Ring Dimming as a Signature of Photon-Axion Conversion in Janis-Newman-Winicour Naked Singularity","authors":"Ayush Hazarika, Premachand Mahapatra, Subhadip Sau","doi":"arxiv-2409.09802","DOIUrl":"https://doi.org/arxiv-2409.09802","url":null,"abstract":"The possible existence of axions in the universe introduces the intriguing\u0000possibility of photon-axion conversion in strong magnetic fields, particularly\u0000near compact objects like supermassive black holes or even naked singularity.\u0000In this study, we investigate the conversion of photons into axions in the\u0000vicinity of a Janis-Newman-Winicour (JNW) spacetime, a well-known naked\u0000singularity solution. Our analysis reveals that photons can efficiently convert\u0000into axions with masses less than $100 rm neV$. We calculate the conversion\u0000probability and find that it is significantly influenced by the characteristic\u0000parameter of the JNW spacetime. The potential observational signatures of this\u0000conversion, would be the dimming of photon ring in the X-ray and gamma-ray\u0000spectrum. Our findings suggest that compact objects like M87* could be prime\u0000candidates for detecting photon-axion conversion effects, provided future\u0000advances in high-resolution observations.","PeriodicalId":501067,"journal":{"name":"arXiv - PHYS - High Energy Physics - Phenomenology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142258930","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Measurements from the LHCb experiment and $B$ factories have revealed several discrepancies in angular observables of rare semileptonic $B$ decays involving the quark-level transition $b to s ell^+ ell^-$. In this work, we conduct a model-independent comparative analysis of the rare semileptonic decays of baryons $Lambda_b$, $Sigma_b$ and $Xi_b$, exploring various new physics scenarios. Our analysis includes predictions for branching ratios and angular observables, including forward-backward asymmetry, longitudinal polarization fractions, and lepton flavor universality ratios, both within the Standard Model and across six distinct new physics scenarios. Notably, we find that certain new physics scenarios significantly affect the observables in the $(Lambda_b, Sigma_b, Xi_b) to (Lambda, Sigma, Xi) mu^+ mu^-$ processes.
来自大型强子对撞机b实验和$B$工厂的测量揭示了涉及夸克级转变$b to s ell^+ ell^-$ 的稀有半轻子$B$衰变的角度观测数据的一些差异。 在这项工作中，我们对重子$Lambda_b$、$Sigma_b$和$Xi_b$的稀有半轻子衰变进行了独立于模型的比较分析，探索了各种新的物理情景。我们的分析包括对标准模型和六种不同的新物理情景中的分支比和角观测值的预测，包括前后不对称、纵向极化分数和轻子味道普遍性比。值得注意的是，我们发现某些新物理情景极大地影响了$(Lambda_b, Sigma_b, Xi_b) to (Lambda, Sigma, Xi) mu^+ mu^-$过程中的观测值。
{"title":"Revealing the $q^2$ dependence in $b to s μ^+ μ^-$ baryonic decay modes","authors":"Ajay Kumar Yadav, Manas Kumar Mohapatra, Suchismita Sahoo","doi":"arxiv-2409.09737","DOIUrl":"https://doi.org/arxiv-2409.09737","url":null,"abstract":"Measurements from the LHCb experiment and $B$ factories have revealed several\u0000discrepancies in angular observables of rare semileptonic $B$ decays involving\u0000the quark-level transition $b to s ell^+ ell^-$. In this work, we conduct a\u0000model-independent comparative analysis of the rare semileptonic decays of\u0000baryons $Lambda_b$, $Sigma_b$ and $Xi_b$, exploring various new physics\u0000scenarios. Our analysis includes predictions for branching ratios and angular\u0000observables, including forward-backward asymmetry, longitudinal polarization\u0000fractions, and lepton flavor universality ratios, both within the Standard\u0000Model and across six distinct new physics scenarios. Notably, we find that\u0000certain new physics scenarios significantly affect the observables in the\u0000$(Lambda_b, Sigma_b, Xi_b) to (Lambda, Sigma, Xi) mu^+ mu^-$\u0000processes.","PeriodicalId":501067,"journal":{"name":"arXiv - PHYS - High Energy Physics - Phenomenology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142258921","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
We revisit the calculation of the evolution equations for four unpolarized twist-3 transverse momentum dependent (TMD) parton distribution functions (PDFs) at $mathcal {O}(alpha_s)$. Unlike the existing calculations in the literature, which are based on the background field method, we derive the evolution equations directly through diagram expansion. Additionally, instead of using the $delta$ regulator, we employ the exponential regulator to regularize the rapidity divergences. We find that the evolutions of the four twist-3 TMD PDFs are governed by eight homogeneous equations. Our evolution kernels agree with one set of results in the literature, but differ from another by a sign. Thus, our results help clarify the discrepancies between the evolution kernels reported in the literature. Moreover, considering the advantages of the exponential regulator in high-order perturbative calculations, our results are crucial for computing the twist-3 TMD PDFs at $mathcal {O}(alpha_s^2)$.
{"title":"Evolution of unpolarized transverse momentum dependent parton distributions of twist-3","authors":"Ping-An Liu, Xue-Tao Liu, Yu-Lu Liu, An-Ping Chen","doi":"arxiv-2409.09667","DOIUrl":"https://doi.org/arxiv-2409.09667","url":null,"abstract":"We revisit the calculation of the evolution equations for four unpolarized\u0000twist-3 transverse momentum dependent (TMD) parton distribution functions\u0000(PDFs) at $mathcal {O}(alpha_s)$. Unlike the existing calculations in the\u0000literature, which are based on the background field method, we derive the\u0000evolution equations directly through diagram expansion. Additionally, instead\u0000of using the $delta$ regulator, we employ the exponential regulator to\u0000regularize the rapidity divergences. We find that the evolutions of the four\u0000twist-3 TMD PDFs are governed by eight homogeneous equations. Our evolution\u0000kernels agree with one set of results in the literature, but differ from\u0000another by a sign. Thus, our results help clarify the discrepancies between the\u0000evolution kernels reported in the literature. Moreover, considering the\u0000advantages of the exponential regulator in high-order perturbative\u0000calculations, our results are crucial for computing the twist-3 TMD PDFs at\u0000$mathcal {O}(alpha_s^2)$.","PeriodicalId":501067,"journal":{"name":"arXiv - PHYS - High Energy Physics - Phenomenology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142258876","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The new version of the SANCphot integrator has been prepared for fast and stable numerical calculations up to two loops for polarized light-by-light scattering. One-loop modules based on the helicity formalism with massive particles and two-loop modules with massless particles inside the loops are used. The presented study is driven by the potential of polarized photon beams to probe the high energy region. This study is a contribution to the research program of the CEPC project being under development in China.
{"title":"Two-loop QED/QCD corrections for polarized $γγrightarrowγγ$ process in SANCphot","authors":"Serge Bondarenko, Aidos Issadykov, Lidia Kalinovskaya, Andrey Sapronov, Diana Seitova","doi":"arxiv-2409.09640","DOIUrl":"https://doi.org/arxiv-2409.09640","url":null,"abstract":"The new version of the SANCphot integrator has been prepared for fast and\u0000stable numerical calculations up to two loops for polarized light-by-light\u0000scattering. One-loop modules based on the helicity formalism with massive\u0000particles and two-loop modules with massless particles inside the loops are\u0000used. The presented study is driven by the potential of polarized photon beams\u0000to probe the high energy region. This study is a contribution to the research\u0000program of the CEPC project being under development in China.","PeriodicalId":501067,"journal":{"name":"arXiv - PHYS - High Energy Physics - Phenomenology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142258877","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Junseok Lee, Kai Murai, Fuminobu Takahashi, Wen Yin
We study topological defects in multi-axion models arising from multiple Peccei-Quinn (PQ) scalars. Using a simplified two-axion system, we reveal fundamental differences in the evolution of these defects compared to single-axion scenarios. This finding is particularly significant because, despite the fact that integrating out heavier axions reduces these models to an effective single PQ scalar theory at low energies, the actual physical behavior of topological defects differs markedly from single-axion predictions. Unlike single-axion models where conventional cosmic strings form, multi-axion scenarios with post-inflationary or mixed initial conditions generically produce networks of strings interconnected by high-tension domain walls. This results in a severe cosmological domain wall problem. We determine string-wall network instability conditions and discuss cosmological implications including the application to the QCD axion and gravitational wave generation. Our findings highlight that multi-axion dynamics can lead to qualitatively different outcomes for topological defects, challenging the conventional picture of cosmic evolution of topological defects based on single-axion models.
{"title":"More is Different: Multi-Axion Dynamics Changes Topological Defect Evolution","authors":"Junseok Lee, Kai Murai, Fuminobu Takahashi, Wen Yin","doi":"arxiv-2409.09749","DOIUrl":"https://doi.org/arxiv-2409.09749","url":null,"abstract":"We study topological defects in multi-axion models arising from multiple\u0000Peccei-Quinn (PQ) scalars. Using a simplified two-axion system, we reveal\u0000fundamental differences in the evolution of these defects compared to\u0000single-axion scenarios. This finding is particularly significant because,\u0000despite the fact that integrating out heavier axions reduces these models to an\u0000effective single PQ scalar theory at low energies, the actual physical behavior\u0000of topological defects differs markedly from single-axion predictions. Unlike\u0000single-axion models where conventional cosmic strings form, multi-axion\u0000scenarios with post-inflationary or mixed initial conditions generically\u0000produce networks of strings interconnected by high-tension domain walls. This\u0000results in a severe cosmological domain wall problem. We determine string-wall\u0000network instability conditions and discuss cosmological implications including\u0000the application to the QCD axion and gravitational wave generation. Our\u0000findings highlight that multi-axion dynamics can lead to qualitatively\u0000different outcomes for topological defects, challenging the conventional\u0000picture of cosmic evolution of topological defects based on single-axion\u0000models.","PeriodicalId":501067,"journal":{"name":"arXiv - PHYS - High Energy Physics - Phenomenology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142258875","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The symmetron is a light scalar which provides a screening mechanism so as to evade the strong constraints from local gravity tests. In order to achieve this goal, a $Z_2$ symmetry is imposed on the symmetron model. In this paper, we introduce a new symmetron Chern-Simons-like gravitational interaction which is $Z_2$ invariant but breaks the parity symmetry explicitly. As a result, it is found that this coupling can generate gravitational wave (GW) amplitude birefringence when GWs propagate over the symmetron backgrounds. Due to the matter density difference, the symmetron profile changes significantly when entering the galaxy, so that we need to discuss the extra-galactic and galactic situations separately. On the one hand, the cosmological symmetron field follows the adiabatic solution, which induces a parity-violating GW amplitude correction with its exponent proportional to the GW frequency and the traveling distance. On the other hand, the symmetron takes the screening solution within the Milky Way, and the generated GW birefringence is only a function of the GW frequency. By further comparing these two contributions, we find that the extra-galactic symmetron field produces the dominant birefringence effects. Finally, with the latest GW data from LIGO-Virgo-Kagra, we place a reasonable constraint on the parity-violating coupling parameter in this symmetron model.
{"title":"Gravitational Wave Birefringence in Symmetron Cosmology","authors":"Ze-Xuan Xiong, Da Huang","doi":"arxiv-2409.09382","DOIUrl":"https://doi.org/arxiv-2409.09382","url":null,"abstract":"The symmetron is a light scalar which provides a screening mechanism so as to\u0000evade the strong constraints from local gravity tests. In order to achieve this\u0000goal, a $Z_2$ symmetry is imposed on the symmetron model. In this paper, we\u0000introduce a new symmetron Chern-Simons-like gravitational interaction which is\u0000$Z_2$ invariant but breaks the parity symmetry explicitly. As a result, it is\u0000found that this coupling can generate gravitational wave (GW) amplitude\u0000birefringence when GWs propagate over the symmetron backgrounds. Due to the\u0000matter density difference, the symmetron profile changes significantly when\u0000entering the galaxy, so that we need to discuss the extra-galactic and galactic\u0000situations separately. On the one hand, the cosmological symmetron field\u0000follows the adiabatic solution, which induces a parity-violating GW amplitude\u0000correction with its exponent proportional to the GW frequency and the traveling\u0000distance. On the other hand, the symmetron takes the screening solution within\u0000the Milky Way, and the generated GW birefringence is only a function of the GW\u0000frequency. By further comparing these two contributions, we find that the\u0000extra-galactic symmetron field produces the dominant birefringence effects.\u0000Finally, with the latest GW data from LIGO-Virgo-Kagra, we place a reasonable\u0000constraint on the parity-violating coupling parameter in this symmetron model.","PeriodicalId":501067,"journal":{"name":"arXiv - PHYS - High Energy Physics - Phenomenology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142258932","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
We investigate the effects of inclusion of charged tachyonic open-string scalars in the perturbative and the non-perturbative K"ahler moduli stabilizations in a geometry of three intersecting magnetized D7-brane stacks in type-IIB/F theory and also study the overall influence of this process on the inflaton potential, in a hybrid inflation scenario. We find that a tachyon lowers the minimum of the inflaton potential and assists to end the inflation. For simplicity, we have included one tachyon at a time in the present work and observe that this procedure preserves the features of slow-roll plateau of the potential. An interesting observation here is that the tachyonic part of the potential can be fine-tuned to get an almost zero minimum of the potential, thereby conforming to the small experimental value of the cosmological constant
{"title":"Tachyonic effects on Kähler moduli stabilized inflaton potential in type-IIB/F theory","authors":"Abhijit Let, Buddhadeb Ghosh","doi":"arxiv-2409.09283","DOIUrl":"https://doi.org/arxiv-2409.09283","url":null,"abstract":"We investigate the effects of inclusion of charged tachyonic open-string\u0000scalars in the perturbative and the non-perturbative K\"ahler moduli\u0000stabilizations in a geometry of three intersecting magnetized D7-brane stacks\u0000in type-IIB/F theory and also study the overall influence of this process on\u0000the inflaton potential, in a hybrid inflation scenario. We find that a tachyon\u0000lowers the minimum of the inflaton potential and assists to end the inflation.\u0000For simplicity, we have included one tachyon at a time in the present work and\u0000observe that this procedure preserves the features of slow-roll plateau of the\u0000potential. An interesting observation here is that the tachyonic part of the\u0000potential can be fine-tuned to get an almost zero minimum of the potential,\u0000thereby conforming to the small experimental value of the cosmological constant","PeriodicalId":501067,"journal":{"name":"arXiv - PHYS - High Energy Physics - Phenomenology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142258924","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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